Income Tax Calculator
Estimate how much income tax you owe based on your annual salary and effective tax rate. Useful for budgeting, filing returns, or comparing take-home pay across job offers.
About this calculator
Income tax is calculated by applying a percentage rate to your taxable income. The core formula is: Tax = (Income × Tax Rate) / 100. In a simplified flat-rate model, the same rate applies to all income. In reality, most countries use progressive brackets where different portions of income are taxed at increasing rates. This calculator uses a single effective rate — the blended average rate across all brackets — to give you a quick, practical estimate. For example, if your marginal rate is 22% but deductions reduce your effective rate to 18%, you would enter 18% to get an accurate result. Understanding your effective rate helps with annual tax planning and paycheck budgeting.
How to use
Suppose you earn $75,000 per year and your effective tax rate is 20%. Enter 75000 as Annual Income and 20 as Tax Rate. The calculator computes: Tax = (75,000 × 20) / 100 = $15,000. That means $15,000 goes to income tax, leaving you with $60,000 in net annual income — about $5,000 per month before other deductions like Social Security or health insurance.
Frequently asked questions
What is the difference between marginal tax rate and effective tax rate?
Your marginal tax rate is the rate applied to the last dollar you earn, while your effective tax rate is the average rate paid across all your income. In a progressive system, only income above each bracket threshold is taxed at the higher rate. For example, someone in the 22% bracket does not pay 22% on all their income. Your effective rate is always lower than or equal to your marginal rate, and it is the more useful figure for estimating your total tax bill.
How do I calculate my income tax if I have multiple income sources?
Add together all taxable income sources — wages, freelance earnings, rental income, interest, and dividends — to get your total gross income. Subtract any eligible deductions (standard or itemized) to arrive at taxable income. Then apply your effective or blended tax rate to that figure using the formula Tax = (Income × Rate) / 100. For complex situations involving self-employment tax or investment income, consult a tax professional or use official government tax software.
Why does my income tax calculation differ from my actual tax return?
This calculator uses a simplified flat effective-rate model, which is a useful approximation but does not account for every real-world variable. Actual tax returns factor in itemized deductions, tax credits, the standard deduction, filing status (single, married, head of household), and additional taxes like the Alternative Minimum Tax. These adjustments can significantly lower or raise your final bill. Use this tool for quick estimates and planning, and consult IRS Publication 505 or a tax advisor for precise figures.