diff --git a/CHANGELOG.md b/CHANGELOG.md
index 733e5bcb0f..f5f5bc8762 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,8 +4,24 @@ All notable changes to this project will be documented in this file. Dates are d
 
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+#### [v6.66.0](https://github.com/opengovsg/FormSG/compare/v6.65.0...v6.66.0)
+
+- fix(deps): [Snyk] Security upgrade mongoose from 5.13.15 to 5.13.20 [`#6541`](https://github.com/opengovsg/FormSG/pull/6541)
+- feat: indicate if GST has been applied to a payment transaction [`#6538`](https://github.com/opengovsg/FormSG/pull/6538)
+- chore: reduce max payment limit [`#6543`](https://github.com/opengovsg/FormSG/pull/6543)
+- fix: updating csp to fix bypass [`#6535`](https://github.com/opengovsg/FormSG/pull/6535)
+- build(deps): bump winston-cloudwatch version to "6.2.0" [`#6542`](https://github.com/opengovsg/FormSG/pull/6542)
+- feat: add description to form issue modal [`#6536`](https://github.com/opengovsg/FormSG/pull/6536)
+- fix: presub remove additional underscore [`#6533`](https://github.com/opengovsg/FormSG/pull/6533)
+- feat: presub-change-icon-to-help [`#6532`](https://github.com/opengovsg/FormSG/pull/6532)
+- build: merge v6.65.0 into develop [`#6531`](https://github.com/opengovsg/FormSG/pull/6531)
+- build: release v6.65.0 [`#6528`](https://github.com/opengovsg/FormSG/pull/6528)
+- fix: add FE validation rule that email domains must be non empty [`#6529`](https://github.com/opengovsg/FormSG/pull/6529)
+
 #### [v6.65.0](https://github.com/opengovsg/FormSG/compare/v6.64.0...v6.65.0)
 
+> 11 July 2023
+
 - fix: issue report icon for mobile [`#6527`](https://github.com/opengovsg/FormSG/pull/6527)
 - feat: Create issue feedback UI on public form interface [`#6452`](https://github.com/opengovsg/FormSG/pull/6452)
 - chore: variable payments UI review changes [`#6524`](https://github.com/opengovsg/FormSG/pull/6524)
@@ -26,6 +42,7 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 - build: release v6.64.0 [`#6509`](https://github.com/opengovsg/FormSG/pull/6509)
 - chore: fix typo maxmium -> maximum [`#6510`](https://github.com/opengovsg/FormSG/pull/6510)
 - feat: deep link myinfo settings message in builder [`#6503`](https://github.com/opengovsg/FormSG/pull/6503)
+- chore: bump version to v6.65.0 [`3ca3ca7`](https://github.com/opengovsg/FormSG/commit/3ca3ca76a7d347953ea5b4153de4575c2f4be3c0)
 
 #### [v6.64.0](https://github.com/opengovsg/FormSG/compare/v6.63.0...v6.64.0)
 
@@ -352,7 +369,7 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 - fix: only return previous payment id [`#6210`](https://github.com/opengovsg/FormSG/pull/6210)
 - build: merge release v6.45.0 to develop [`#6205`](https://github.com/opengovsg/FormSG/pull/6205)
 - build: release v6.45.0 [`#6200`](https://github.com/opengovsg/FormSG/pull/6200)
-- chore: bump version to v6.46.0 [`767e7e5`](https://github.com/opengovsg/FormSG/commit/767e7e55c3e8f058963e890b1c249704d6db1459)
+- chore: bump version to v6.46.0 [`87fda0e`](https://github.com/opengovsg/FormSG/commit/87fda0e0ec4c937350ebd013a4a9762f4acee802)
 
 #### [v6.45.0](https://github.com/opengovsg/FormSG/compare/v6.44.1...v6.45.0)
 
@@ -515,7 +532,7 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 - build: merge v6.37.0 into develop  [`#5989`](https://github.com/opengovsg/FormSG/pull/5989)
 - build: release v6.37.0 [`#5988`](https://github.com/opengovsg/FormSG/pull/5988)
 
-#### [v6.37.0](https://github.com/opengovsg/FormSG/compare/v6.36.1...v6.37.0)
+#### [v6.37.0](https://github.com/opengovsg/FormSG/compare/v6.36.0...v6.37.0)
 
 > 24 March 2023
 
@@ -545,17 +562,10 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 - chore(deps-dev): bump @typescript-eslint/parser from 5.54.1 to 5.55.0 in /shared [`#5922`](https://github.com/opengovsg/FormSG/pull/5922)
 - test(e2e/email): add form auth tests [`#5876`](https://github.com/opengovsg/FormSG/pull/5876)
 - build: merge v6.36.0 into develop [`#5914`](https://github.com/opengovsg/FormSG/pull/5914)
+- build: release v6.36.0 [`#5913`](https://github.com/opengovsg/FormSG/pull/5913)
 - chore: bump version to v6.37.0 [`b4d24eb`](https://github.com/opengovsg/FormSG/commit/b4d24eb14f8a80bff56d19e6fa23975d5661cce9)
 - chore: bump version to 6.36.1 [`faf75b5`](https://github.com/opengovsg/FormSG/commit/faf75b5a7d0d12745e9a0104c541fb66cca17258)
 
-#### [v6.36.1](https://github.com/opengovsg/FormSG/compare/v6.36.0...v6.36.1)
-
-> 17 March 2023
-
-- build: release v6.36.0 [`#5913`](https://github.com/opengovsg/FormSG/pull/5913)
-- chore: bump version to 6.36.1 [`7bc8b06`](https://github.com/opengovsg/FormSG/commit/7bc8b0669b29565be1d7a8b4cb8b76801a9a44ba)
-- fix: trim dropdown options for logic check [`25e197a`](https://github.com/opengovsg/FormSG/commit/25e197a22eecec527b2b284aee0b95ccb1cd3797)
-
 #### [v6.36.0](https://github.com/opengovsg/FormSG/compare/v6.35.0...v6.36.0)
 
 > 9 March 2023
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 777a7261ba..3c94369445 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "form-frontend",
-  "version": "6.65.0",
+  "version": "6.66.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "form-frontend",
-      "version": "6.65.0",
+      "version": "6.66.0",
       "hasInstallScript": true,
       "dependencies": {
         "@chakra-ui/react": "^1.8.6",
diff --git a/frontend/package.json b/frontend/package.json
index da97e2c36d..14a19eb5e7 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "form-frontend",
-  "version": "6.65.0",
+  "version": "6.66.0",
   "homepage": ".",
   "private": true,
   "dependencies": {
diff --git a/frontend/src/features/admin-form/create/builder-and-design/BuilderAndDesignDrawer/FieldListDrawer/field-panels/PaymentsInputPanel/VariablePaymentAmountField.tsx b/frontend/src/features/admin-form/create/builder-and-design/BuilderAndDesignDrawer/FieldListDrawer/field-panels/PaymentsInputPanel/VariablePaymentAmountField.tsx
index ee4742b1e9..bce9785704 100644
--- a/frontend/src/features/admin-form/create/builder-and-design/BuilderAndDesignDrawer/FieldListDrawer/field-panels/PaymentsInputPanel/VariablePaymentAmountField.tsx
+++ b/frontend/src/features/admin-form/create/builder-and-design/BuilderAndDesignDrawer/FieldListDrawer/field-panels/PaymentsInputPanel/VariablePaymentAmountField.tsx
@@ -32,23 +32,27 @@ export const VariablePaymentAmountField = ({
       minPaymentAmountCents = Number.MIN_SAFE_INTEGER,
     } = {},
   } = useEnv()
+
+  const minAmountInDollars = `S${formatCurrency(
+    Number(centsToDollars(minPaymentAmountCents)),
+  )}`
+  const maxAmountInDollars = `S${formatCurrency(
+    Number(centsToDollars(maxPaymentAmountCents)),
+  )}`
+
   const minAmountValidation: RegisterOptions<
     FormPaymentsInput,
     typeof MIN_FIELD_KEY
   > = usePaymentFieldValidation<FormPaymentsInput, typeof MIN_FIELD_KEY>({
     lesserThanCents: dollarsToCents(input[MAX_FIELD_KEY] || ''),
-    msgWhenEmpty: `The minimum amount is S${formatCurrency(
-      Number(centsToDollars(minPaymentAmountCents)),
-    )}`,
+    msgWhenEmpty: `The minimum amount is ${minAmountInDollars}`,
   })
   const maxAmountValidation: RegisterOptions<
     FormPaymentsInput,
     typeof MAX_FIELD_KEY
   > = usePaymentFieldValidation<FormPaymentsInput, typeof MAX_FIELD_KEY>({
     greaterThanCents: dollarsToCents(input[MIN_FIELD_KEY] || ''),
-    msgWhenEmpty: `The maximum amount is S${formatCurrency(
-      Number(centsToDollars(maxPaymentAmountCents)),
-    )}`,
+    msgWhenEmpty: `The maximum amount is ${maxAmountInDollars}`,
   })
   return (
     <FormControl
@@ -77,7 +81,7 @@ export const VariablePaymentAmountField = ({
                 flex={1}
                 step={0}
                 inputMode="decimal"
-                placeholder="S$0.50"
+                placeholder={minAmountInDollars}
                 {...field}
               />
             )}
@@ -97,7 +101,7 @@ export const VariablePaymentAmountField = ({
                 flex={1}
                 step={0}
                 inputMode="decimal"
-                placeholder="S$1,000,000"
+                placeholder={maxAmountInDollars}
                 {...field}
               />
             )}
diff --git a/frontend/src/features/admin-form/settings/SettingsService.ts b/frontend/src/features/admin-form/settings/SettingsService.ts
index 2ddb570426..5b8f6b8729 100644
--- a/frontend/src/features/admin-form/settings/SettingsService.ts
+++ b/frontend/src/features/admin-form/settings/SettingsService.ts
@@ -119,6 +119,15 @@ export const updateBusinessInfo: UpdateStorageFormFn<'business'> = async (
   return updateFormSettings(formId, { business: newBusinessField })
 }
 
+export const updateGstEnabledFlag = async (
+  formId: string,
+  gstEnabledFlag: StorageFormSettings['payments_field']['gst_enabled'],
+) => {
+  return updateFormSettings(formId, {
+    payments_field: { gst_enabled: gstEnabledFlag },
+  })
+}
+
 /**
  * Internal function that calls the PATCH API.
  * @param formId the id of the form to update
diff --git a/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/BusinessInfoSection.tsx b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/BusinessInfoSection.tsx
index 575a7ce078..b03a9bceec 100644
--- a/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/BusinessInfoSection.tsx
+++ b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/BusinessInfoSection.tsx
@@ -88,26 +88,18 @@ const BusinessInfoBlock = ({
   }
   return (
     <>
+      {settings.payments_field.gst_enabled ? (
+        <FormControl mb="2.5rem" isReadOnly={mutateFormBusiness.isLoading}>
+          <FormLabel isRequired>GST Registration Number</FormLabel>
+          <BusinessFieldInput
+            placeholder={agencyDefaults?.gstRegNo || ''}
+            initialValue={settings.business?.gstRegNo || ''}
+            handleMutation={handleGstRegNoMutation}
+          />
+        </FormControl>
+      ) : null}
       <FormControl mb="2.5rem" isReadOnly={mutateFormBusiness.isLoading}>
-        <FormLabel
-          description="Leave blank to use your agency's GST Registration Number"
-          isRequired
-        >
-          GST Registration Number
-        </FormLabel>
-        <BusinessFieldInput
-          placeholder={agencyDefaults?.gstRegNo || ''}
-          initialValue={settings.business?.gstRegNo || ''}
-          handleMutation={handleGstRegNoMutation}
-        />
-      </FormControl>
-      <FormControl mb="2.5rem" isReadOnly={mutateFormBusiness.isLoading}>
-        <FormLabel
-          description="Leave blank to use your agency's business address"
-          isRequired
-        >
-          Business Address
-        </FormLabel>
+        <FormLabel isRequired>Business Address</FormLabel>
         <BusinessFieldInput
           placeholder={agencyDefaults?.address || ''}
           initialValue={settings.business?.address || ''}
diff --git a/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/GstToggleSection.tsx b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/GstToggleSection.tsx
new file mode 100644
index 0000000000..b63e01d064
--- /dev/null
+++ b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/GstToggleSection.tsx
@@ -0,0 +1,50 @@
+import { useCallback, useMemo } from 'react'
+import { Skeleton } from '@chakra-ui/react'
+
+import { FormResponseMode } from '~shared/types'
+
+import Toggle from '~components/Toggle'
+
+import { useMutateFormSettings } from '../../mutations'
+import { useAdminFormSettings } from '../../queries'
+
+export const GstToggleSection = (): JSX.Element => {
+  const { data: settings, isLoading: isLoadingSettings } =
+    useAdminFormSettings()
+
+  const hasGST = useMemo(
+    () =>
+      settings &&
+      settings.responseMode === FormResponseMode.Encrypt &&
+      settings?.payments_field.gst_enabled,
+    [settings],
+  )
+
+  const { mutateGST } = useMutateFormSettings()
+
+  const handleToggleGST = useCallback(() => {
+    if (
+      !settings ||
+      isLoadingSettings ||
+      mutateGST.isLoading ||
+      settings.responseMode !== FormResponseMode.Encrypt
+    ) {
+      return
+    }
+    const nextHasGst = !settings.payments_field.gst_enabled
+    return mutateGST.mutate(nextHasGst)
+  }, [isLoadingSettings, mutateGST, settings])
+
+  return (
+    <Skeleton isLoaded={!isLoadingSettings && !!settings}>
+      <Toggle
+        mb="2.5rem"
+        isLoading={mutateGST.isLoading}
+        isChecked={hasGST}
+        label="GST applicable"
+        description="GST will be mentioned in proof of payment"
+        onChange={() => handleToggleGST()}
+      />
+    </Skeleton>
+  )
+}
diff --git a/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/PaymentSettingsSection.tsx b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/PaymentSettingsSection.tsx
index 71e1746f09..4a503f48e9 100644
--- a/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/PaymentSettingsSection.tsx
+++ b/frontend/src/features/admin-form/settings/components/PaymentSettingsSection/PaymentSettingsSection.tsx
@@ -24,6 +24,7 @@ import { useEnv } from '~features/env/queries'
 import { useAdminFormPayments, useAdminFormSettings } from '../../queries'
 
 import { BusinessInfoSection } from './BusinessInfoSection'
+import { GstToggleSection } from './GstToggleSection'
 import { usePaymentGuideLink } from './queries'
 import {
   StripeConnectButton,
@@ -231,6 +232,7 @@ export const PaymentSettingsSection = (): JSX.Element => {
           {hasPaymentCapabilities && (
             <>
               <Divider my="2.5rem" />
+              <GstToggleSection />
               <BusinessInfoSection />
             </>
           )}
diff --git a/frontend/src/features/admin-form/settings/mutations.ts b/frontend/src/features/admin-form/settings/mutations.ts
index fe985ee436..ce03163b7e 100644
--- a/frontend/src/features/admin-form/settings/mutations.ts
+++ b/frontend/src/features/admin-form/settings/mutations.ts
@@ -37,6 +37,7 @@ import {
   updateFormTitle,
   updateFormWebhookRetries,
   updateFormWebhookUrl,
+  updateGstEnabledFlag,
   updateTwilioCredentials,
 } from './SettingsService'
 
@@ -303,6 +304,20 @@ export const useMutateFormSettings = () => {
     },
   )
 
+  const mutateGST = useMutation(
+    (gstEnabledFlag: StorageFormSettings['payments_field']['gst_enabled']) =>
+      updateGstEnabledFlag(formId, gstEnabledFlag),
+    {
+      onSuccess: (newData) => {
+        handleSuccess({
+          newData,
+          toastDescription: `GST setting has been updated.`,
+        })
+      },
+      onError: handleError,
+    },
+  )
+
   return {
     mutateWebhookRetries,
     mutateFormWebhookUrl,
@@ -315,6 +330,7 @@ export const useMutateFormSettings = () => {
     mutateFormAuthType,
     mutateFormEsrvcId,
     mutateFormBusiness,
+    mutateGST,
   }
 }
 
diff --git a/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackButton.tsx b/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackButton.tsx
index ed608c7666..ac4d16c17d 100644
--- a/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackButton.tsx
+++ b/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackButton.tsx
@@ -1,4 +1,4 @@
-import { BiMessage } from 'react-icons/bi'
+import { BiQuestionMark } from 'react-icons/bi'
 import { Flex, useDisclosure } from '@chakra-ui/react'
 
 import { noPrintCss } from '~utils/noPrintCss'
@@ -26,7 +26,7 @@ export const FormIssueFeedbackButton = (): JSX.Element | null => {
           variant="outline"
           cursor="pointer"
           aria-label="issue feedback"
-          icon={<BiMessage color="primary.500" />}
+          icon={<BiQuestionMark color="primary.500" />}
           onClick={onOpen}
         />
       </Tooltip>
diff --git a/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackModal.tsx b/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackModal.tsx
index 31b269cb67..e4c9849e43 100644
--- a/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackModal.tsx
+++ b/frontend/src/features/public-form/components/FormIssueFeedback/FormIssueFeedbackModal.tsx
@@ -98,17 +98,23 @@ export const FormIssueFeedbackModal = ({
             pr="4rem"
           >
             <Text textStyle={{ base: '1.25rem', md: '1.5rem' }}>
-              Have trouble filling out this form?
+              Report an issue
             </Text>
           </ModalHeader>
           <ModalBody>
+            <Text pb="1.5rem" textStyle="body-2" mt="0">
+              Fill this in only{' '}
+              <span style={{ fontWeight: 'bold' }}>
+                if you are experiencing issues and are unable to submit this
+                form
+              </span>
+              . If you would like to provide feedback, you can do so after
+              submitting the form.
+            </Text>
             <Stack>
               <FormControl isInvalid={!!errors.issue}>
-                <FormLabel
-                  isRequired={true}
-                  description={'This will be sent to the form creator.'}
-                >
-                  Please describe the issue you encountered.
+                <FormLabel isRequired={true}>
+                  Please describe the issue you encountered
                 </FormLabel>
                 <Textarea
                   {...register('issue', {
@@ -121,12 +127,7 @@ export const FormIssueFeedbackModal = ({
               </FormControl>
 
               <FormControl isInvalid={!!errors.email}>
-                <FormLabel
-                  pt="1rem"
-                  description="Leave your email so the form creator can reach out to you if needed."
-                >
-                  Contact
-                </FormLabel>
+                <FormLabel pt="1rem">Contact</FormLabel>
                 <Input
                   type={BasicField.Email}
                   placeholder="me@example.com"
diff --git a/package-lock.json b/package-lock.json
index 874c04fe51..3066a712e0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "FormSG",
-  "version": "6.65.0",
+  "version": "6.66.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "FormSG",
-      "version": "6.65.0",
+      "version": "6.66.0",
       "hasInstallScript": true,
       "dependencies": {
         "@aws-sdk/client-cloudwatch-logs": "^3.347.1",
@@ -92,7 +92,7 @@
         "moment-timezone": "0.5.41",
         "mongodb-memory-server-core": "^6.9.6",
         "mongodb-uri": "^0.9.7",
-        "mongoose": "^5.13.15",
+        "mongoose": "^5.13.20",
         "multiparty": ">=4.2.3",
         "nan": "^2.17.0",
         "neverthrow": "^6.0.0",
@@ -20842,8 +20842,9 @@
       }
     },
     "node_modules/mongodb": {
-      "version": "3.7.3",
-      "license": "Apache-2.0",
+      "version": "3.7.4",
+      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-3.7.4.tgz",
+      "integrity": "sha512-K5q8aBqEXMwWdVNh94UQTwZ6BejVbFhh1uB6c5FKtPE9eUMZPUO3sRZdgIEcHSrAWmxzpG/FeODDKL388sqRmw==",
       "dependencies": {
         "bl": "^2.2.1",
         "bson": "^1.1.4",
@@ -21115,14 +21116,15 @@
       }
     },
     "node_modules/mongoose": {
-      "version": "5.13.15",
-      "license": "MIT",
+      "version": "5.13.20",
+      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-5.13.20.tgz",
+      "integrity": "sha512-TjGFa/XnJYt+wLmn8y9ssjyO2OhBMeEBtOHb9iJM16EWu2Du6L1Q6zSiEK2ziyYQM8agb4tumNIQFzqbxId7MA==",
       "dependencies": {
         "@types/bson": "1.x || 4.0.x",
         "@types/mongodb": "^3.5.27",
         "bson": "^1.1.4",
         "kareem": "2.3.2",
-        "mongodb": "3.7.3",
+        "mongodb": "3.7.4",
         "mongoose-legacy-pluralize": "1.0.2",
         "mpath": "0.8.4",
         "mquery": "3.2.5",
@@ -43714,7 +43716,9 @@
       }
     },
     "mongodb": {
-      "version": "3.7.3",
+      "version": "3.7.4",
+      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-3.7.4.tgz",
+      "integrity": "sha512-K5q8aBqEXMwWdVNh94UQTwZ6BejVbFhh1uB6c5FKtPE9eUMZPUO3sRZdgIEcHSrAWmxzpG/FeODDKL388sqRmw==",
       "requires": {
         "bl": "^2.2.1",
         "bson": "^1.1.4",
@@ -43861,13 +43865,15 @@
       "version": "0.9.7"
     },
     "mongoose": {
-      "version": "5.13.15",
+      "version": "5.13.20",
+      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-5.13.20.tgz",
+      "integrity": "sha512-TjGFa/XnJYt+wLmn8y9ssjyO2OhBMeEBtOHb9iJM16EWu2Du6L1Q6zSiEK2ziyYQM8agb4tumNIQFzqbxId7MA==",
       "requires": {
         "@types/bson": "1.x || 4.0.x",
         "@types/mongodb": "^3.5.27",
         "bson": "^1.1.4",
         "kareem": "2.3.2",
-        "mongodb": "3.7.3",
+        "mongodb": "3.7.4",
         "mongoose-legacy-pluralize": "1.0.2",
         "mpath": "0.8.4",
         "mquery": "3.2.5",
diff --git a/package.json b/package.json
index 69650d55a0..5d8f737359 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "FormSG",
   "description": "Form Manager for Government",
-  "version": "6.65.0",
+  "version": "6.66.0",
   "homepage": "https://form.gov.sg",
   "authors": [
     "FormSG <formsg@data.gov.sg>"
@@ -135,7 +135,7 @@
     "moment-timezone": "0.5.41",
     "mongodb-memory-server-core": "^6.9.6",
     "mongodb-uri": "^0.9.7",
-    "mongoose": "^5.13.15",
+    "mongoose": "^5.13.20",
     "multiparty": ">=4.2.3",
     "nan": "^2.17.0",
     "neverthrow": "^6.0.0",
diff --git a/scripts/20230718_set-gst-enabled-flag/set-gst-enabled-flag.js b/scripts/20230718_set-gst-enabled-flag/set-gst-enabled-flag.js
new file mode 100644
index 0000000000..c637213ba4
--- /dev/null
+++ b/scripts/20230718_set-gst-enabled-flag/set-gst-enabled-flag.js
@@ -0,0 +1,70 @@
+/* eslint-disable */
+
+/**
+ * This script adds the `gstEnabled` flag to the payments collection and sets the flag for all existing documents to true. 
+ * It also adds the `gst_enabled` flag to the `payments_field` in the form collection, and sets the flag for all existing
+ * documents with a `payments_field` to true. 
+ */
+
+// PAYMENTS COLLECTION
+// BEFORE
+// Count total number of payments.
+db.getCollection('payments').countDocuments({})
+
+// Count total number of payments with no gstEnabled flag value. This should be equal to the total number of payments.
+db
+  .getCollection('payments')
+  .countDocuments({ gstEnabled: { $exists: false } })
+
+// UPDATE
+db.getCollection('payments').updateMany({}, [
+  { $set: { gstEnabled: true } },
+])
+
+// AFTER
+// Count total number of payments with gstEnabled flag value. This should be equal to the total number of payments.
+db
+  .getCollection('payments')
+  .countDocuments({ gstEnabled: { $exists: true } })
+
+// Count total number of payments with no gstEnabled flag value. This should be equal to 0
+db
+  .getCollection('payments')
+  .countDocuments({ gstEnabled: { $exists: false } })
+
+
+// FORM COLLECTION
+// BEFORE
+
+// Count number of forms that contains the payments_field property
+db.getCollection("forms").find(
+    {payments_field: {$ne: null }},
+).count()
+
+// Count total number of forms with no gstEnabled flag value. This should be equal to 0.
+db.getCollection('forms')
+  .find({ 'payments_field.gst_enabled': { $exists: true } })
+  .count()
+
+// UPDATE all forms (with payment fields) gst_enabled flag to true
+db.getCollection('forms').updateMany({ payments_field: { $ne: null } },  [
+  { $set: { payments_field: { gst_enabled: true } } },
+])
+
+// AFTER
+// Count total number of forms with gstEnabled flag value. This should be equal to the total number of forms with payments_fields.
+db.getCollection('forms')
+  .find({ 'payments_field.gst_enabled': { $exists: true } })
+  .count()
+
+// Count total number of forms with payments_field property and no gstEnabled flag value. This should be equal to 0
+
+db.getCollection('forms')
+  .find({
+    $and: [
+      { payments_field: { $ne: null } },
+      { payments_field: {gst_enabled: { $ne: null }} },
+    ],
+  })
+  .count()
+
diff --git a/shared/types/form/form.ts b/shared/types/form/form.ts
index 8feb7ebaa2..1888056b17 100644
--- a/shared/types/form/form.ts
+++ b/shared/types/form/form.ts
@@ -99,6 +99,7 @@ export type FormPaymentsField =
       enabled: boolean
       description?: string
       name?: string
+      gst_enabled?: boolean
     } & (VariablePaymentsField | FixedPaymentField)
 
 export type FormBusinessField = {
diff --git a/shared/types/payment.ts b/shared/types/payment.ts
index 0347a4906a..5a6486f80f 100644
--- a/shared/types/payment.ts
+++ b/shared/types/payment.ts
@@ -43,6 +43,7 @@ export type Payment = {
   email: string
   amount: number
   paymentIntentId: string
+  gstEnabled: boolean
 
   // Payment status tracking
   webhookLog: Stripe.Event[]
diff --git a/src/app/config/features/payment.config.ts b/src/app/config/features/payment.config.ts
index fd4af25159..aeb069ca44 100644
--- a/src/app/config/features/payment.config.ts
+++ b/src/app/config/features/payment.config.ts
@@ -53,7 +53,7 @@ const paymentFeature: Schema<IPaymentFeature> = {
   maxPaymentAmountCents: {
     doc: 'Maximum amount that can be paid for a form',
     format: Number,
-    default: 100000000, // Arbitrary large payment amount we should be concerned about
+    default: 200 * 1000 * 100, // 200k, this is the maximum limit for paynow transactions
     env: 'PAYMENT_MAX_PAYMENT_AMOUNT_CENTS',
   },
   minPaymentAmountCents: {
diff --git a/src/app/loaders/express/__tests__/helmet.spec.ts b/src/app/loaders/express/__tests__/helmet.spec.ts
index e76cb017be..4e8d216d2b 100644
--- a/src/app/loaders/express/__tests__/helmet.spec.ts
+++ b/src/app/loaders/express/__tests__/helmet.spec.ts
@@ -31,17 +31,17 @@ describe('helmetMiddlewares', () => {
     fontSrc: ["'self'", 'data:', 'https://fonts.gstatic.com/'],
     scriptSrc: [
       "'self'",
-      'https://www.googletagmanager.com/',
       'https://ssl.google-analytics.com/',
       'https://www.google-analytics.com/',
       'https://www.tagmanager.google.com/',
       'https://www.google.com/recaptcha/',
       'https://www.recaptcha.net/recaptcha/',
-      'https://www.gstatic.com/recaptcha/',
+      'https://www.gstatic.com/recaptcha/releases/',
       'https://challenges.cloudflare.com',
       'https://js.stripe.com/v3',
-      'https://www.gstatic.cn/',
-      'https://*.googletagmanager.com',
+      // GA4 https://developers.google.com/tag-platform/tag-manager/web/csp
+      // not actively used yet, loading specific file due to CSP bypass issue
+      'https://*.googletagmanager.com/gtag/',
     ],
     connectSrc: [
       "'self'",
diff --git a/src/app/loaders/express/helmet.ts b/src/app/loaders/express/helmet.ts
index f48b6a7285..ba054e08a7 100644
--- a/src/app/loaders/express/helmet.ts
+++ b/src/app/loaders/express/helmet.ts
@@ -44,17 +44,17 @@ const helmetMiddlewares = () => {
     fontSrc: ["'self'", 'data:', 'https://fonts.gstatic.com/'],
     scriptSrc: [
       "'self'",
-      'https://www.googletagmanager.com/',
       'https://ssl.google-analytics.com/',
       'https://www.google-analytics.com/',
       'https://www.tagmanager.google.com/',
       'https://www.google.com/recaptcha/',
       'https://www.recaptcha.net/recaptcha/',
-      'https://www.gstatic.com/recaptcha/',
+      'https://www.gstatic.com/recaptcha/releases/',
       'https://challenges.cloudflare.com',
       'https://js.stripe.com/v3',
-      'https://www.gstatic.cn/',
-      'https://*.googletagmanager.com', // GA4 https://developers.google.com/tag-platform/tag-manager/web/csp
+      // GA4 https://developers.google.com/tag-platform/tag-manager/web/csp
+      // not actively used yet, loading specific files due to CSP bypass issue
+      'https://*.googletagmanager.com/gtag/',
     ],
     connectSrc: [
       "'self'",
diff --git a/src/app/models/__tests__/form.server.model.spec.ts b/src/app/models/__tests__/form.server.model.spec.ts
index d6f1fd23ad..cdedd7e90e 100644
--- a/src/app/models/__tests__/form.server.model.spec.ts
+++ b/src/app/models/__tests__/form.server.model.spec.ts
@@ -104,6 +104,7 @@ const PAYMENTS_DEFAULTS = {
     min_amount: 0,
     max_amount: 0,
     payment_type: PaymentType.Fixed,
+    gst_enabled: true,
   },
 }
 
diff --git a/src/app/models/form.server.model.ts b/src/app/models/form.server.model.ts
index d44ef59c0f..d55394ac29 100644
--- a/src/app/models/form.server.model.ts
+++ b/src/app/models/form.server.model.ts
@@ -200,6 +200,10 @@ const EncryptedFormSchema = new Schema<IEncryptedFormSchema>({
       enum: Object.values(PaymentType),
       default: PaymentType.Fixed,
     },
+    gst_enabled: {
+      type: Boolean,
+      default: true,
+    },
   },
 
   business: {
diff --git a/src/app/models/payment.server.model.ts b/src/app/models/payment.server.model.ts
index ba8748afa0..2c865740ca 100644
--- a/src/app/models/payment.server.model.ts
+++ b/src/app/models/payment.server.model.ts
@@ -38,6 +38,10 @@ const PaymentSchema = new Schema<IPaymentSchema, IPaymentModel>(
       type: String,
       required: true,
     },
+    gstEnabled: {
+      type: Boolean,
+      required: true,
+    },
     responses: [],
 
     webhookLog: [],
diff --git a/src/app/modules/form/admin-form/admin-form.middlewares.ts b/src/app/modules/form/admin-form/admin-form.middlewares.ts
index cd03eb51bb..0c3a1f5aba 100644
--- a/src/app/modules/form/admin-form/admin-form.middlewares.ts
+++ b/src/app/modules/form/admin-form/admin-form.middlewares.ts
@@ -32,6 +32,7 @@ export const updateSettingsValidator = celebrate({
       address: Joi.string().allow(''),
       gstRegNo: Joi.string().allow(''),
     }),
+    payments_field: Joi.object({ gst_enabled: Joi.boolean() }),
   })
     .min(1)
     .custom((value, helpers) => verifyValidUnicodeString(value, helpers)),
diff --git a/src/app/modules/form/admin-form/admin-form.payments.controller.ts b/src/app/modules/form/admin-form/admin-form.payments.controller.ts
index ff18967ba7..74f31cffa4 100644
--- a/src/app/modules/form/admin-form/admin-form.payments.controller.ts
+++ b/src/app/modules/form/admin-form/admin-form.payments.controller.ts
@@ -371,6 +371,10 @@ const updatePaymentsValidator = celebrate({
       then: Joi.string().trim().required(),
       otherwise: Joi.string().trim().allow(''),
     }),
+    gst_enabled: Joi.when('enabled', {
+      is: Joi.equal(true),
+      then: Joi.boolean().required(),
+    }),
   },
 })
 
diff --git a/src/app/modules/payments/__tests__/payments.controller.spec.ts b/src/app/modules/payments/__tests__/payments.controller.spec.ts
index 7608f145a5..74f919b95b 100644
--- a/src/app/modules/payments/__tests__/payments.controller.spec.ts
+++ b/src/app/modules/payments/__tests__/payments.controller.spec.ts
@@ -42,6 +42,7 @@ describe('payments.controller', () => {
         completedPayment: {
           receiptUrl: 'http://form.gov.sg',
         },
+        gstEnabled: false,
       })
 
       const mockReq = expressHandler.mockRequest({
@@ -72,6 +73,7 @@ describe('payments.controller', () => {
         completedPayment: {
           receiptUrl: 'http://form.gov.sg',
         },
+        gstEnabled: false,
       })
 
       const mockReq = expressHandler.mockRequest({
@@ -101,6 +103,7 @@ describe('payments.controller', () => {
         completedPayment: {
           receiptUrl: 'http://form.gov.sg',
         },
+        gstEnabled: false,
       })
 
       const mockReq = expressHandler.mockRequest({
@@ -130,6 +133,7 @@ describe('payments.controller', () => {
         completedPayment: {
           receiptUrl: 'http://form.gov.sg',
         },
+        gstEnabled: false,
       })
 
       const mockReq = expressHandler.mockRequest({
diff --git a/src/app/modules/payments/__tests__/payments.service.spec.ts b/src/app/modules/payments/__tests__/payments.service.spec.ts
index 4844c09d0a..78ba5e2764 100644
--- a/src/app/modules/payments/__tests__/payments.service.spec.ts
+++ b/src/app/modules/payments/__tests__/payments.service.spec.ts
@@ -44,6 +44,7 @@ describe('payments.service', () => {
         paymentIntentId: 'somePaymentIntentId',
         amount: 314159,
         email: 'someone@mail.com',
+        gstEnabled: false,
       })
 
       // Act
@@ -86,6 +87,7 @@ describe('payments.service', () => {
         amount: 314159,
         email: email,
         status: PaymentStatus.Succeeded,
+        gstEnabled: false,
       })
     })
     afterEach(() => jest.clearAllMocks())
@@ -114,6 +116,7 @@ describe('payments.service', () => {
         amount: 314159,
         email: email,
         status: PaymentStatus.Succeeded,
+        gstEnabled: false,
       })
       const result =
         await PaymentsService.findLatestSuccessfulPaymentByEmailAndFormId(
@@ -163,6 +166,7 @@ describe('payments.service', () => {
         amount: 314159,
         email: newEmail,
         status: PaymentStatus.Pending,
+        gstEnabled: false,
       })
       const result =
         await PaymentsService.findLatestSuccessfulPaymentByEmailAndFormId(
@@ -197,6 +201,7 @@ describe('payments.service', () => {
         targetAccountId: 'acct_MOCK_ID',
         formId: new ObjectId(),
         pendingSubmissionId: new ObjectId(),
+        gstEnabled: false,
       }
 
       await Payment.create({
diff --git a/src/app/modules/payments/__tests__/stripe.controller.spec.ts b/src/app/modules/payments/__tests__/stripe.controller.spec.ts
index 553f4562ad..ce2f0bf4fc 100644
--- a/src/app/modules/payments/__tests__/stripe.controller.spec.ts
+++ b/src/app/modules/payments/__tests__/stripe.controller.spec.ts
@@ -76,6 +76,7 @@ describe('stripe.controller', () => {
       ...mockBusinessInfo,
       formTitle: mockFormTitle,
       submissionId: mockSubmissionId,
+      gstEnabled: false,
     }
     const mockForm = {
       _id: MOCK_FORM_ID,
@@ -111,6 +112,7 @@ describe('stripe.controller', () => {
           receiptUrl: 'http://form.gov.sg',
           submissionId: mockSubmissionId,
         },
+        gstEnabled: false,
       })
     })
     it('should generate return a pdf file when receipt url is present', async () => {
@@ -213,6 +215,7 @@ describe('stripe.controller', () => {
         completedPayment: {
           receiptUrl: 'http://form.gov.sg',
         },
+        gstEnabled: false,
       })
 
       const mockReq = expressHandler.mockRequest({
diff --git a/src/app/modules/payments/__tests__/stripe.service.spec.ts b/src/app/modules/payments/__tests__/stripe.service.spec.ts
index acd39d743f..6c46c7a530 100644
--- a/src/app/modules/payments/__tests__/stripe.service.spec.ts
+++ b/src/app/modules/payments/__tests__/stripe.service.spec.ts
@@ -281,6 +281,7 @@ describe('stripe.service', () => {
         status: PaymentStatus.Pending,
         paymentIntentId: 'pi_MOCK_PAYMENT_INTENT',
         email: 'formsg@tech.gov.sg',
+        gstEnabled: false,
       })
       await pendingSubmission.updateOne({
         paymentId: payment._id,
diff --git a/src/app/modules/payments/stripe.service.ts b/src/app/modules/payments/stripe.service.ts
index 9c4c489bc5..dbe0a69b5a 100644
--- a/src/app/modules/payments/stripe.service.ts
+++ b/src/app/modules/payments/stripe.service.ts
@@ -999,6 +999,7 @@ export const generatePaymentInvoice = (
       gstRegNo: businessGstRegNo || '',
       formTitle: populatedForm.title,
       submissionId: payment.completedPayment?.submissionId || '',
+      gstEnabled: payment.gstEnabled,
     })
 
     return ResultAsync.fromPromise(
diff --git a/src/app/modules/payments/stripe.utils.ts b/src/app/modules/payments/stripe.utils.ts
index 8e52ccef5d..47743d34d7 100644
--- a/src/app/modules/payments/stripe.utils.ts
+++ b/src/app/modules/payments/stripe.utils.ts
@@ -409,30 +409,24 @@ export const convertToInvoiceFormat = (
     gstRegNo,
     formTitle,
     submissionId,
+    gstEnabled,
   }: {
     address: string
     gstRegNo: string
     formTitle: string
     submissionId: string
+    gstEnabled: boolean
   },
 ) => {
   // handle special characters in addresses
   const ADDRESS = encode(address)
   const GST_REG_NO = encode(gstRegNo)
 
-  const edited = receiptHtmlSource
+  const commonEdits = receiptHtmlSource
     .replace(/(<title>.*?)receipt(.*?<\/title>)/, '$1invoice$2')
     .replace(/Receipt from /g, 'Invoice from ')
-    .replace(
-      /Receipt (#[0-9-]+)/,
-      `Invoice $1<br /><br />GST Reg No: ${GST_REG_NO}<br />Address: ${ADDRESS}`,
-    )
     .replace(/Date paid/g, 'Invoice Date')
     .replace(/<br>\(This amount is inclusive of GST\)/, '')
-    .replace(
-      '<strong>Amount charged</strong>',
-      '<strong>Amount charged</strong> <i>(includes GST)</i>',
-    )
     .replace(
       /Something wrong with the email\? <a.+a>/,
       `FormSG Form: ${encode(formTitle)}<br />Response ID: ${submissionId}`,
@@ -442,7 +436,22 @@ export const convertToInvoiceFormat = (
       '<td class="st-Spacer st-Spacer--gutter" width="48"></td>',
     )
 
-  const dom = new JSDOM(edited)
+  const gstDependentEdits = gstEnabled
+    ? commonEdits
+        .replace(
+          /Receipt (#[0-9-]+)/,
+          `Invoice $1<br /><br />GST Reg No: ${GST_REG_NO}<br />Address: ${ADDRESS}`,
+        )
+        .replace(
+          '<strong>Amount charged</strong>',
+          `<strong>Amount charged</strong> <i>(includes GST)</i>`,
+        )
+    : commonEdits.replace(
+        /Receipt (#[0-9-]+)/,
+        `Invoice $1<br /><br />Address: ${ADDRESS}`,
+      )
+
+  const dom = new JSDOM(gstDependentEdits)
   const { document } = dom.window
 
   // select last 3 tables to remove, n = last index
diff --git a/src/app/modules/submission/encrypt-submission/encrypt-submission.controller.ts b/src/app/modules/submission/encrypt-submission/encrypt-submission.controller.ts
index 611a8c245f..054707b4ea 100644
--- a/src/app/modules/submission/encrypt-submission/encrypt-submission.controller.ts
+++ b/src/app/modules/submission/encrypt-submission/encrypt-submission.controller.ts
@@ -429,6 +429,7 @@ const submitEncryptModeForm: ControllerHandler<
       amount,
       email: paymentReceiptEmail,
       responses: incomingSubmission.responses,
+      gstEnabled: form.payments_field.gst_enabled,
     })
     const paymentId = payment.id
 
diff --git a/src/app/routes/api/v3/admin/forms/__tests__/admin-forms.submissions.routes.spec.ts b/src/app/routes/api/v3/admin/forms/__tests__/admin-forms.submissions.routes.spec.ts
index 5fea4ed92b..93f298767c 100644
--- a/src/app/routes/api/v3/admin/forms/__tests__/admin-forms.submissions.routes.spec.ts
+++ b/src/app/routes/api/v3/admin/forms/__tests__/admin-forms.submissions.routes.spec.ts
@@ -1242,6 +1242,7 @@ describe('admin-form.submissions.routes', () => {
         paymentIntentId: 'somePaymentIntentId',
         amount: 314159,
         email: 'someone@mail.com',
+        gstEnabled: false,
       })
       // Create 3 submissions
       const submissions = await Promise.all(
@@ -1355,6 +1356,7 @@ describe('admin-form.submissions.routes', () => {
         paymentIntentId: 'somePaymentIntentId',
         amount: 314159,
         email: 'someone@mail.com',
+        gstEnabled: false,
       })
       // Create 3 submissions
       const submissions = await Promise.all(
diff --git a/src/app/views/templates/issue-reported-notification.view.html b/src/app/views/templates/issue-reported-notification.view.html
index a527e92257..6451c8c005 100644
--- a/src/app/views/templates/issue-reported-notification.view.html
+++ b/src/app/views/templates/issue-reported-notification.view.html
@@ -9,8 +9,8 @@
       might be facing urgent issues relating to form submission.
     </p>
     <p>
-      <a href="<%= formResultUrl %>">Login to Forms </a> and view issues
-      reported in your results page.
+      <a href="<%= formResultUrl %>">Login to Forms</a> and view issues reported
+      in your results page.
     </p>
     <p>Regards,<br /><%= appName %> team</p>
   </body>