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@zenuinebit/tax

v0.1.0

Published

Inclusive and exclusive tax calculation with multi-component taxes (e.g. GST). Works in minor units.

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Readme

@zenuinebit/tax

Tax calculation in minor units (see @zenuinebit/money). Rates are percentages.

import { calculateTax, gstIntraState } from "@zenuinebit/tax";

calculateTax(10000, 18);                          // { net: 10000, tax: 1800, gross: 11800, ... }
calculateTax(11800, 18, { inclusive: true });     // { net: 10000, tax: 1800, gross: 11800, ... }
calculateTax(1010, gstIntraState(5)).components;  // CGST 26 + SGST 25 = 51, always adds up

Tax is rounded once on the total and then split across components, so component amounts always add up to the total. Negative amounts (credit notes) are supported. Tax rules vary by country and change over time: you supply the rates.