Key takeaways
- Monthly and quarterly filers owe by the 20th of the month after the period; annual filers by October 20.
- Frequency follows liability: $1,201 or more per period is monthly, more than $201 and up to $1,200 is quarterly, and $200 or less is annual.
- December 20, 2026 is a Sunday, so the November return is due Monday, December 21, 2026.
- File a zero return when there were no sales, or OTR sends a delinquency notice.
- The booklet lists a 5% per month penalty and 10% annual interest, and I found no timely-filing discount in it.
Where DC sales tax is filed and who must register
Every return goes through MyTax.DC.gov, the portal run by OTR, the Office of Tax and Revenue. The instructions for the FR-800M/Q/A booklet say the return must be filed and paid electronically, and that you must be registered and logged in to file. There is no paper route to plan around.
Before a client makes taxable sales in the District, the instructions say to register through the business registration process using the Combined Registration Application, Form FR-500, which carries no charge. List every District location on it, because OTR issues a Certificate of Registration per location. Selling without one can draw a fine of up to $50 for each day.
Remote sellers count too. The instructions treat a vendor with no physical presence as engaging in business if, in the previous or current calendar year, gross receipts from retail sales delivered into the District exceeded $100,000 or there were 200 or more separate retail sales delivered there. For an e-commerce client, run that test on delivery addresses, not on where the client sits.
Filing frequency: how OTR assigns it
The account is assigned a frequency, and MyTax.DC.gov picks the matching form at login. The booklet ties the form to liability per period. Form FR-800M, monthly, applies at $1,201 or more. Form FR-800Q, quarterly, applies above $201 and up to $1,200. Form FR-800A, annual, applies at $200 or less.
Two defaults matter at onboarding. The booklet says all new registrants are filed quarterly, and marketplace facilitators must file monthly. So a client registered in March will see quarterly obligations even if you expect large volume, and a client whose tax per period grows past the monthly line can find the account moved. Check the filing calendar inside the portal after every registration instead of assuming last year's frequency.
Decision rule: if the client's tax per period is trending above $1,200, ask OTR which frequency is on the account before the quarter closes, and put the monthly dates on your calendar anyway.
Due dates for 2026 and early 2027, with weekend shifts
The rule is the 20th day of the month after the monthly, quarterly or annual period. If that day is a Saturday, Sunday or legal holiday, the return is due the next business day. Annual filers use October 20.
Monthly returns: October 2026 is due Friday, November 20, 2026. November 2026 is due Monday, December 21, 2026, because December 20 is a Sunday. December 2026 is due Wednesday, January 20, 2027.
Quarterly returns: July through September 2026 was due Tuesday, October 20, 2026. October through December 2026 is due Wednesday, January 20, 2027. Earlier this year June 20 was a Saturday and September 20 a Sunday, so those monthly returns moved to the following Monday. The annual return for 2026 is due October 20, 2027.
Tax year note: the booklet I read covers October 1, 2025 to September 30, 2026. Confirm on MyTax.DC.gov that rates and thresholds did not change for periods starting October 1, 2026 before you quote them for later periods.
Reading the return: rate lines
The online return has separate lines by rate. Line 1 is general sales at 6%. Line 2 is commercial bingo at 7.5%. Line 3 is soft drinks not for immediate consumption at 8%. Line 4 is food and drink for immediate consumption at 10%. Line 5 is prepaid calling cards at 10%. Line 6 is off-premises alcohol at 10.25%, and Line 7 is rental vehicles at 10.25%. Line 8 is hotel and short-term lodging at 15.95%, and Line 9 is parking at 18%. Line 10 totals them, and use tax sits on lines 11 to 19.
For each line you enter gross sales, exempt or resale sales, marketplace sales, and any credit for tax refunded to purchasers. The portal requires exempt or resale sales to be no more than gross sales, and marketplace sales to be no more than gross sales.
Example: a restaurant that also sells bottled wine to take home has two lines in play, Line 4 at 10% for the meals and Line 6 at 10.25% for the wine. A point of sale that rolls everything into one category is the usual source of misposted tax, so ask for the split before you key anything.
Gross receipts quirk: certain telecommunication services are exempt from sales tax when the charges are subject to the DC gross receipts tax or the toll telecommunication tax, so a telecom client needs a separate look.
Penalties, interest and payment
The booklet lists a penalty of 5% per month, or fraction of a month, for failing to file or pay on time, computed on the unpaid tax and capped at an additional 25% of the tax due. Interest is 10% per year, compounded daily. A one-time 10% collection fee applies to a balance unpaid after 90 days. A payment that bounces costs a $65 fee, and a negligent underpayment can carry a 20% penalty.
You must file even if you made no sales or owe no tax. Enter zero on the total amount due line. I found no timely-filing discount or vendor compensation in the booklet, so do not tell a client one exists.
Payment options are ACH debit from bank details stored on MyTax.DC.gov, a credit or debit card with a fee, or ACH credit for business taxpayers using tax type code 00350. If the payment due exceeds $5,000 it must be electronic. Allow 1 to 3 business days when a client changes bank information.
What to collect from the client each period
Ask for the sales report from the point of sale or cart, split by rate. Send: "Please send the October sales report grouped by tax rate, with food, alcohol, retail and any parking or lodging shown separately, plus the refund report" and attach last month's report as the model.
Ask for resale certificates, DC form OTR-368, for every customer who bought without tax, and form FR-551 for semi-public institutions. Without the certificate on file, an exempt sale looks taxable at audit.
Ask for marketplace sales separately. If a platform collected and remitted tax for the client, those sales go in the marketplace column and are not taxed twice, so request the platform's monthly statement.
Collect refunds issued to customers, bad debt write-offs and use tax purchases, meaning business purchases made without DC tax paid, including goods withdrawn from stock bought under a resale certificate. The booklet allows a bad debt deduction, but later collections must be reported in full in the period collected. Refunds for an earlier period go through Form FP-331.
Send the request at close, not on the 19th. If you use a recurring request tool such as Usual, set the sales tax request to generate each month with a due date several days before the 20th and reminders that skip weekends. Whatever the tool, give the client a date well ahead of the filing deadline itself.
Amendments, closing an account and common failures
Amended and final returns for Form FR-800M, Q or A are filed on MyTax.DC.gov. To amend, open View Returns in the Sales and Use account, find the period, choose View or Amend Return, then Amend. For a closed business, check the final return option so OTR cancels the filing requirement, and do not use it just to mark the last return of a period.
Failure: a rejected TIN. The instructions say a return can be rejected for a missing, incorrect or invalid TIN, and the account number must be the one OTR issued at registration. Keep it in the client file, because the instructions make the taxpayer responsible for giving it to the preparer.
Failure: the client registered but never sold, so nobody filed. A zero return is still due every period. File the zero returns and keep the confirmation.