Return zero taxes instead of throwing when income is below PA (#9)

SavingTool · Sep 27, 2023 · f011f5f · f011f5f
1 parent 49fb7c4
commit f011f5f
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/src/incomeTax.test.ts b/src/incomeTax.test.ts
@@ -2,6 +2,8 @@ import { calculateIncomeTax } from "./incomeTax";
 import { calculatePersonalAllowance } from "./personalAllowance";
 
 const expectations = [
+  { taxableAnnualIncome: 0, basic: 0, higher: 0, additional: 0 },
+  { taxableAnnualIncome: 5_000, basic: 0, higher: 0, additional: 0 },
   { taxableAnnualIncome: 15_000, basic: 486, higher: 0, additional: 0 },
   { taxableAnnualIncome: 17_500, basic: 986, higher: 0, additional: 0 },
   { taxableAnnualIncome: 20_000, basic: 1486, higher: 0, additional: 0 },

diff --git a/src/incomeTax.ts b/src/incomeTax.ts
@@ -85,5 +85,10 @@ export const calculateIncomeTax = ({
     };
   }
 
-  throw new Error("Unexpected Input");
+  // Income is lower than the personal allowance - no income tax
+  return {
+    basicRateTax: 0,
+    higherRateTax: 0,
+    additionalRateTax: 0,
+  };
 };