Maryland’s sales tax filing frequency is set by how much tax your business collects in a year: collect $15,000 or more and you file monthly, collect less than that and you file quarterly. Either way, the return is due on the 20th of the month after the reporting period ends. Maryland does not offer an annual sales tax filing option.
The $15,000 Threshold
The Comptroller of Maryland uses a single number to sort accounts. If your business collects $15,000 or more in sales and use tax during a year, you file every month. If you collect less, you file every quarter. That works out to roughly $1,250 a month as the practical breakpoint, but the Comptroller looks at total annual collections, not any single month’s numbers.
Your schedule isn’t fixed forever. The Comptroller monitors accounts and can move a quarterly filer to monthly status when collection trends warrant it. A business that reports unusually high collections for a quarter or two may receive a notice that it must begin filing every month going forward. It works the other way too: if your sales drop and you consistently collect well under the threshold, the Comptroller may put you back on a quarterly schedule. Keep your registration information current so those notifications actually reach you.
No Annual Filing Option
A common misreading of the Comptroller’s website is that Maryland offers an annual sales tax filing option. It does not. The annual deadline listed on the site applies to employer withholding tax, not sales and use tax.1Comptroller of Maryland. Tax Guidance – Filing Deadlines and Due Dates Every registered sales tax account files either twelve times a year or four times a year.
When Returns Are Due
Both monthly and quarterly returns are due on the 20th of the month after the reporting period closes.2Comptroller of Maryland. Maryland Sales and Use Tax Frequently Asked Questions For monthly filers, January’s return is due February 20, February’s return is due March 20, and the pattern continues through December.
Quarterly filers have four deadlines a year:
- January through March: due April 20
- April through June: due July 20
- July through September: due October 20
- October through December: due January 20
When the 20th falls on a Saturday, Sunday, or legal holiday, the deadline shifts to the next business day.1Comptroller of Maryland. Tax Guidance – Filing Deadlines and Due Dates Put the dates on your calendar at the start of each year so a holiday weekend doesn’t catch you late.
File Every Period, Even With No Sales
A registered business owes a return for every reporting period on its schedule, whether or not it collected any tax. Skipping a return because you had no taxable sales is not the same as filing a zero return, and the Comptroller treats them very differently. A missing return triggers the same penalty and interest treatment as a late return with money owed. A zero return takes a few minutes and keeps your account in good standing.
The Timely Filing Discount
Filing and paying on time earns you a small discount on the tax you remit. The formula depends on the amount due for the period:3Comptroller of Maryland. Sales and Use Tax Application Help
- $6,000 or less in tax due: multiply the amount by 1.2%
- More than $6,000 in tax due: multiply the amount by 0.9% and add $18
The discount caps at $500 per return. Businesses filing consolidated returns across multiple locations share a single $500 cap across those returns. The discount disappears entirely if the return or payment is even one day late; there is no partial credit. For a business remitting $5,000 a month in sales tax, the 1.2% discount is $60 a month, or $720 a year, for nothing more than meeting the deadline.
Penalties for Missing a Deadline
Miss the 20th and the penalty is 10% of the unpaid tax.3Comptroller of Maryland. Sales and Use Tax Application Help Continued nonpayment can push the penalty as high as 25% of the amount owed.4Comptroller of Maryland. Tax Guidance – Penalty and Interest Charges Interest accrues monthly on top of the penalty. For 2025, the annual interest rate is 11.4825%; the Comptroller publishes each year’s rate separately.5Comptroller of Maryland. Sales and Use Tax Updates 2025-2026 A late return also forfeits the timely filing discount, so a single missed deadline can compound quickly on a return of any size.
There is a personal dimension too. Maryland law classifies every vendor as a trustee of the sales tax it collects, meaning the money belongs to the state from the moment your customer pays it.6Maryland General Assembly. Maryland Code Tax-General 11-401 – Vendor Corporate officers, LLC managers, and members who direct management can be held personally responsible for unpaid sales tax. The corporate veil does not shield personal assets in this area.
Marketplace Facilitators File Monthly
If you’re reading this because you sell through an online marketplace, the frequency rule works differently for the platform. Marketplace facilitators such as Amazon, Etsy, and eBay are required to collect and remit Maryland sales tax on the transactions they facilitate, and they must file on a monthly basis regardless of volume.7Comptroller of Maryland. Sales and Use Tax Alert – Marketplace Facilitators If all of your Maryland sales go through a facilitator that handles the tax, you generally don’t collect on those sales yourself. Any direct sales you make outside the platform still count toward your own $15,000 threshold and put you on your own monthly or quarterly schedule.