Mississippi Income Tax Calculator 2026

How Mississippi Income Tax Calculator Works

Calculate your Mississippi income tax (4.0% flat rate) plus federal tax. See combined brackets, effective rate, and take-home pay. Enter your values into the form above and the calculator processes them instantly in your browser — no data is sent to any server.

Mississippi Income Tax: 4.0% Flat Rate

Mississippi uses a flat income tax rate of 4.0% for 2026 (House Bill 1, 2025) on taxable income above $10,000; the first $10,000 of taxable income is taxed at 0%. Taxable income is your income after the standard deduction ($2,300 single, $4,600 married filing jointly, $3,400 head of household) and the personal exemption ($6,000 single, $12,000 married filing jointly, $8,000 head of household). The rate steps down to 3.75% in 2027, 3.5% in 2028, 3.25% in 2029 and 3.0% in 2030.

On top of the 4.0% state tax, Mississippi residents also pay federal income tax ranging from 10% to 37%. This calculator combines both federal and Mississippi state tax to show your total liability, effective rate, and take-home pay.

How Mississippi's Flat Tax Compares

A flat tax simplifies filing — you pay 4.0% on taxable income above $10,000 without navigating multiple brackets. Compared to the national median top state rate of around 5.5%, Mississippi's 4.0% rate is below average. For a single filer earning $100,000, the Mississippi state tax would be approximately $3,268 ($91,700 taxable after the $8,300 deduction and exemption; 4.0% on the $81,700 above the $10,000 zero-rate band).

States with flat taxes tend to have simpler returns and more predictable tax bills. The trade-off is that lower-income residents pay the same percentage as higher earners, unlike graduated systems where rates increase with income.

Reducing Your Mississippi Tax Bill

While you cannot change the flat rate, you can reduce your taxable income. Contributions to traditional 401(k) and IRA accounts reduce both your federal and Mississippi state taxable income. The 2026 401(k) limit is $24,500 ($32,500 with catch-up for age 50+). HSA contributions are also pre-tax for both federal and state purposes in most states.

Tips for Getting Accurate Results

For the most accurate results, use up-to-date numbers from official sources. Double-check your inputs before calculating — small errors in the starting values can lead to significantly different outputs. If you are comparing scenarios, keep all variables the same except the one you are testing. Save or screenshot your results for future reference. This calculator uses standard formulas and is designed to give you a reliable quick estimate, though professional advice may be needed for complex situations.