diff --git a/sdk/src/math/insurance.ts b/sdk/src/math/insurance.ts
index 6524b5d86c..3e0baa0774 100644
--- a/sdk/src/math/insurance.ts
+++ b/sdk/src/math/insurance.ts
@@ -17,7 +17,7 @@ export function nextRevenuePoolSettleApr(
 		SpotBalanceType.DEPOSIT
 	);
 
-	const payoutRatio = 0.1;
+	const payoutRatioDenominator = 10;
 	const ratioForStakers =
 		spotMarket.insuranceFund.totalFactor > 0 &&
 		spotMarket.insuranceFund.userFactor > 0 &&
@@ -30,15 +30,16 @@ export function nextRevenuePoolSettleApr(
 	const revSettlePeriod =
 		spotMarket.insuranceFund.revenueSettlePeriod.toNumber() * 1000;
 
-	const settlesPerYear = 31536000000 / revSettlePeriod;
-
 	const projectedAnnualRev = revenuePoolBN
-		.muln(settlesPerYear)
-		.muln(payoutRatio);
+		.mul(new BN(31536000000))
+		.div(new BN(revSettlePeriod))
+		.divn(payoutRatioDenominator);
+
+	const delta = amount ?? ZERO;
 
-	const uncappedApr = vaultBalance.add(amount).eq(ZERO)
+	const uncappedApr = vaultBalance.add(delta).eq(ZERO)
 		? 0
-		: projectedAnnualRev.muln(1000).div(vaultBalance.add(amount)).toNumber() *
+		: projectedAnnualRev.muln(1000).div(vaultBalance.add(delta)).toNumber() *
 		  100 *
 		  1000;
 	const cappedApr = Math.min(uncappedApr, MAX_APR.toNumber());