Build a Malaysian Income Tax Calculator in Pure JavaScript

Building a Malaysian Income Tax Calculator in Pure JavaScript Calculating your Malaysian personal income tax doesn't have to be a mystery. In this tutorial, we'll build a working tax calculator using pure JavaScript and the 2024 LHDN (Inland Revenue Board) tax brackets. By the end, you'll have a reusable function you can drop into any web project. The 2024 Malaysian Income Tax Brackets Malaysia uses a progressive tax system — you only pay the higher rate on income above each threshold. Here are the current rates for residents (chargeable income after deductions): Chargeable Income (RM) Tax Rate 0 – 5,000 0% 5,001 – 20,000 1% 20,001 – 35,000 3% 35,001 – 50,000 6% 50,001 – 70,000 11% 70,001 – 100,000 19% 100,001 – 400,000 25% 400,001 – 600,000 26% 600,001 – 2,000,000 28% Above 2,000,000 30% Note: These rates apply to chargeable income — your gross income minus all eligible reliefs and deductions. For a full breakdown of what you can deduct, see this Malaysia tax filing guide . Building t