How often do I file sales tax returns in Maryland?

Maryland 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 Maryland 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 Maryland 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.

Maryland Sales Tax Filing Guide — 2026

Updated 2026-05-08

If your Filing business sells $100,000 or 200 transactions into Maryland in a calendar year, you have economic nexus and must register, collect, and remit Maryland sales tax.

Filing frequency in Maryland

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. Maryland may reassign your frequency if your liability changes materially.

Zero returns still matter

Even if you had zero taxable sales in Maryland 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

Maryland'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 Maryland 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; Maryland'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.

Maryland nexus note

Economic nexus in Maryland triggers when remote sellers exceed $100,000 in gross sales OR 200 or more separate transactions into Maryland in the current or preceding calendar year — whichever is met first.

What to do next

Read the full Maryland 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 Maryland?: Maryland 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 Maryland 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 Maryland 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: 2026-05-08