Mississippi sales tax filing deadlines (2026 and 2027)
Published November 9, 2026
The short answer: Mississippi sales tax returns are due on or before the 20th of the month after each reporting period. That’s true whether you file monthly, quarterly, or annually. When the 20th lands on a Saturday, Sunday, or legal holiday, the deadline moves to the next business day.
Which filing frequency are you?
The Mississippi Department of Revenue assigns your filing frequency based on how much sales tax you pay in a year. According to its reporting requirements page:
| Annual sales tax paid | Filing frequency |
|---|---|
| Less than $600 | Annual |
| $600 to $3,599 | Quarterly |
| More than $3,599 | Monthly |
The DOR reviews accounts every year and will notify you if your frequency changes. Your assigned frequency is on your account in TAP, the DOR’s online filing portal.
Monthly filers: due dates
| Sales for | Return and payment due |
|---|---|
| October 2026 | Friday, November 20, 2026 |
| November 2026 | Monday, December 21, 2026 (the 20th is a Sunday) |
| December 2026 | Wednesday, January 20, 2027 |
| January 2027 | Monday, February 22, 2027 (the 20th is a Saturday) |
| February 2027 | Monday, March 22, 2027 (the 20th is a Saturday) |
| March 2027 | Tuesday, April 20, 2027 |
| April 2027 | Thursday, May 20, 2027 |
| May 2027 | Monday, June 21, 2027 (the 20th is a Sunday) |
| June 2027 | Tuesday, July 20, 2027 |
| July 2027 | Friday, August 20, 2027 |
| August 2027 | Monday, September 20, 2027 |
| September 2027 | Wednesday, October 20, 2027 |
| October 2027 | Monday, November 22, 2027 (the 20th is a Saturday) |
| November 2027 | Monday, December 20, 2027 |
| December 2027 | Thursday, January 20, 2028 |
Quarterly filers: due dates
| Quarter | Return and payment due |
|---|---|
| Q4 2026 (October to December) | Wednesday, January 20, 2027 |
| Q1 2027 (January to March) | Tuesday, April 20, 2027 |
| Q2 2027 (April to June) | Tuesday, July 20, 2027 |
| Q3 2027 (July to September) | Wednesday, October 20, 2027 |
| Q4 2027 (October to December) | Thursday, January 20, 2028 |
Annual filers
Your 2026 return is due Wednesday, January 20, 2027. Your 2027 return is due Thursday, January 20, 2028.
We adjusted the dates above for weekends. We didn’t find a Mississippi legal holiday on any of them, but check the DOR’s calendar if you’re filing at the last minute.
Filing and paying are two steps
The DOR is clear about this: when you file online through TAP, completing the return and paying the tax are separate steps, and you have to do both. You’re also required to file online if you report more than four tax rates, have more than one sales tax account or location, or owe certain special fees and taxes.
What being late costs
According to the DOR, penalties apply immediately after the due date, and interest starts the month after. On the other side, Mississippi law lets you keep a 2% discount on the tax due when you file and pay by the 20th, up to $50 a month. On-time filing literally pays.
How clean books make the 20th easy
A sales tax return is only as good as the books behind it. The routine that makes the 20th a non-event:
- Close the month in the first week or two: reconcile every account and clear uncategorized transactions.
- Record sales tax you collect as a liability, not income, with a separate account for each local levy you collect.
- Tie the sales tax liability in the books to the numbers on the return before you file.
- File and pay, both steps, before the 20th.
Our month-end close checklist walks through it step by step. And if your city adds its own levies, see the Mississippi city guides.
Quick answers
When is Mississippi sales tax due?
On or before the 20th day of the month after the reporting period, for monthly, quarterly, and annual filers. If the 20th is a weekend or legal holiday, it moves to the next business day.
Can I get an extension on a Mississippi sales tax return?
Generally no. The DOR says the Commissioner can extend for good cause, such as a natural disaster, but the tax is still due and interest may apply.
Is there a discount for filing on time?
Yes. Paying by the 20th earns a 2% discount on the tax due, capped at $50 a month.
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Sources (checked November 9, 2026). Rates and rules change, so confirm with the agency before you file. This is general information, not tax advice.