Mississippi Estimated Tax Payments (2026)

Do you have to pay estimated taxes in Mississippi?

Yes, in most cases. Mississippi requires estimated payments only if your annual income tax liability exceeds $200 and less than 80% of it is covered by withholding. Mississippi taxes income at 4%, after the first $10,000 of taxable income, which is taxed at 0%.

When are Mississippi estimated taxes due in 2026?

Mississippi's 2026 quarterly payments are due April 15, June 15, September 15, and January 15, in four equal installments, on the same calendar as your federal payments.

• Q1, April 15, 2026

• Q2, June 15, 2026

• Q3, September 15, 2026

• Q4, January 15, 2027

How much should you set aside for Mississippi estimated taxes?

Plan to set aside 20% to 25% of your net self-employment profit to cover federal and Mississippi taxes combined, then confirm the exact amount with the calculator above. On $50,000 of net self-employment profit, federal self-employment tax alone is about $7,065 (15.3% on 92.35% of your earnings). On top of that you'll owe federal income tax and Mississippi income tax, up to about $1,600 at Mississippi's 4% rate on income above $10,000, before deductions.

How do you avoid Mississippi underpayment interest?

To avoid Mississippi underpayment interest, pay at least 80% of your 2026 Mississippi tax in four on-time installments. Mississippi charges interest of 0.5% a month on any shortfall, and there's no option to base payments on last year's tax. Paying the full amount late doesn't help; each installment has to be on time. You can estimate a federal underpayment penalty here.

What deductions lower your Mississippi estimated taxes?

Because estimated taxes are based on your net profit, every business write-off you claim lowers what you owe each quarter. Common deductions for 1099 workers, reported on Schedule C, include the home-office deduction, car mileage, phone and internet, software, and supplies. Like the IRS, Mississippi lets you deduct half of your self-employment tax. The federal Qualified Business Income (QBI) deduction can remove up to 20% of your qualified business income from your federal taxes, but Mississippi doesn’t allow it, so it doesn’t lower your Mississippi tax.

Keeper's 1099 tax calculator estimates your bill after deductions, and our write-off guides list the deductions for your line of work.

Note: Figures are current for the 2026 tax year and are for planning, not tax advice. Confirm the details with the Mississippi Department of Revenue before you file.

How to file quarterly taxes in Mississippi

Filing quarterly in Mississippi means two separate payments each period: one to the IRS for federal tax, and one to the Mississippi Department of Revenue for your state taxes. Here’s how to do it.

1. Confirm you need to pay. You owe estimated payments when tax isn’t withheld from enough of your income — 1099 or freelance work, investment income, or other untaxed income. Federal and Mississippi run separate tests: the state generally requires estimated payments if you expect to owe more than $200 in Mississippi tax after withholding and credits, subject to its safe-harbor rules.
2. Calculate your federal estimate. Use the Form 1040-ES worksheet (or tax software). Estimate your full-year income, add your federal income tax and self-employment tax, subtract anything already withheld from a paycheck, and split the rest across the year. The estimate at the top of this page gives you a starting number.
3. Calculate your Mississippi estimate separately. Work out your Mississippi amount on its own using Form 80-106. Don’t just send part of your federal payment to the state — the Mississippi calculation is separate, based on your Mississippi income tax, credits, and any Mississippi withholding.
4. Pay the IRS. Pay through IRS Direct Pay (or EFTPS) and choose the estimated tax / Form 1040-ES option. Select tax year 2026 and save the confirmation number. This money counts only toward your federal taxes.
5. Pay Mississippi separately. Make a second payment to Taxpayer Access Point and select the Form 80-106 estimated payment for 2026. Save that confirmation too. This money counts only toward your Mississippi taxes.
6. Repeat on each deadline. For 2026, federal estimated payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Mississippi uses those same four dates.

Steps reflect 2026 rules and are for planning, not tax advice.