How often do I file sales tax returns in Mississippi?

Mississippi assigns filing frequency based on your expected tax liability: monthly for high-volume sellers, quarterly for mid-volume, annually for low-volume. The DOR may reassign as your activity changes.

What if I had zero sales in Mississippi for a period?

You still file a zero return. Missing filings trigger penalties regardless of tax owed. Most tax services file zero returns automatically.

When are Mississippi sales tax returns due?

Typically the 20th of the month following the filing period (with variations). Late filing and late payment each carry their own penalty structure — file early to avoid either.

Mississippi Sales Tax Filing Guide — 2026

Updated 2026-05-15

If your Filing business sells $250,000 into Mississippi in a calendar year, you have economic nexus and must register, collect, and remit Mississippi sales tax.

Filing frequency in Mississippi

Most states assign a filing cadence when you register, based on your expected tax liability: monthly for high-volume sellers ($50K+ tax liability/year), quarterly for mid-volume, and annually for low-volume. Mississippi may reassign your frequency if your liability changes materially.

Zero returns still matter

Even if you had zero taxable sales in Mississippi during a period, you must file a zero return. Missing filings trigger penalties regardless of tax owed. Most automated tax services will file zero returns for you by default.

Due dates

Mississippi's filing due dates are typically the 20th of the month following the period end (with variations). Late filing penalties are usually 5%/month up to 25%; late payment adds interest. Register for the state's auto-pay or use a service that remits on your behalf to avoid late fees.

Filing mistakes that cost Mississippi sellers

Skipping a zero return in a slow month — most penalty exposure comes from missed filings, not unpaid tax.
Waiting until due date to file; Mississippi's portal can time out on volume days. File at least 48 hours early.
Not keeping exemption certificates on file — if you're audited and can't produce a valid certificate for a tax-exempt sale, that sale becomes taxable and you owe the uncollected tax.

Mississippi nexus note

Mississippi sales and use tax nexus threshold: out-of-state businesses with Mississippi sales exceeding $250,000 over any twelve-month period are considered to have substantial economic presence effective July 1, 2018 and must register, collect, and remit tax. Mississippi uses a sales-only threshold — no transaction-count test. Remote sellers should measure sales on a rolling twelve-month basis rather than the current-or-prior-calendar-year framing used by many other states.

What to do next

Read the full Mississippi overview for thresholds, filing frequency, marketplace facilitator rules, and registration links. Use the nexus calculator to check whether you have crossed the threshold. For background on the post-Wayfair economic nexus framework, see the pillar guide.

Frequently asked questions

How often do I file sales tax returns in Mississippi?: Mississippi assigns filing frequency based on your expected tax liability: monthly for high-volume sellers, quarterly for mid-volume, annually for low-volume. The DOR may reassign as your activity changes.
What if I had zero sales in Mississippi for a period?: You still file a zero return. Missing filings trigger penalties regardless of tax owed. Most tax services file zero returns automatically.
When are Mississippi sales tax returns due?: Typically the 20th of the month following the filing period (with variations). Late filing and late payment each carry their own penalty structure — file early to avoid either.

Sources

date_retrieved: 2026-05-15