Key takeaways
- Returns and payments go through ND TAP, and the state assigns the filing frequency when the permit is issued.
- On the 2026 calendar the September return was due November 2, the October return is due November 30 and the November return is due December 31.
- Tax follows the North Dakota location where the sale is delivered, so a single store-level rate is a common error.
- A late return costs 5% or $5, whichever is greater, for the first month, plus 5% for each further month up to 25%.
- Keep sales tax records for three years and three months.
File in ND TAP and set up access first
The Office of State Tax Commissioner says sales and use tax returns and payments are made through ND TAP, its online portal. Amended returns are also made there. The page says a paper amendment goes through the office at 701-328-1246, so a firm that cannot amend online should phone rather than mail a corrected return.
Before the first period, get the client to add the firm to its ND TAP account, or have the firm named on the account, instead of filing under the owner's login. The page does not describe a tax-professional access model, so confirm with the office how it wants a preparer attached. Record who holds the login, because the monthly return stalls when the only person with access is on leave.
Read the frequency off the permit, not off the sales
The state's page says the filing frequency is determined at the time you apply for the permit, and that you can contact the office to change it. The pages I read do not publish a dollar test for monthly, quarterly or annual filing, so do not tell a client that a particular sales volume moves it to another schedule.
Ask the client for the permit letter or the ND TAP account screen and write the frequency into the client file. Sales, use and gross receipts taxes can be filed monthly, quarterly, semi-annually or annually, while restaurant and lodging taxes and city motor vehicle rental taxes run monthly or quarterly, with semi-annual and annual options for restaurant and lodging. A client with a restaurant tax and a sales tax account may carry two schedules, so list each account separately.
A request that works: "Please send your North Dakota permit letter or a screenshot of the ND TAP account page showing your filing frequency." If the client says it files quarterly but ND TAP shows monthly, follow ND TAP, because that is the schedule the state will measure lateness against.
Calendar the 2026 due dates and weekend shifts
The state's 2026 deadline calendar lists monthly returns on these dates: March 2 for January, March 31 for February, April 30 for March, June 1 for April, June 30 for May, July 31 for June, August 31 for July, September 30 for August, November 2 for September, November 30 for October and December 31 for November. Quarterly returns for Q1, Q2 and Q3 2026 are due April 30, July 31 and November 2.
The calendar shows the weekend rule at work. January 31 was a Saturday, so the December 2025 monthly return and the 2025 quarterly, semi-annual and annual returns were due February 2. February 28 was a Saturday, so the January return moved to March 2. May 31 was a Sunday, so the April return moved to June 1. October 31 was a Saturday, so the September and Q3 returns moved to November 2. The dates are not always the last day of the month, so do not generate them with a month-end formula.
What is open today and what comes next
As of November 9, 2026, the September monthly and Q3 quarterly returns were due November 2. If the client has not filed, treat it as late and file now, because the first-month penalty is a minimum of 5% or $5. The October monthly return is due November 30 and the November monthly return is due December 31.
The calendar I read lists only 2026 dates. The fourth quarter 2026 return, the second-half semi-annual return and the annual return for calendar year 2026 fall in early 2027, and the state had not posted those dates there. Do not copy the 2026 February date forward, because the weekday changes every year. Check the state's deadline page when it publishes the 2027 calendar and enter the dates then.
Rates, gross receipts tax and local taxes
The state says the sales tax rate is 5% for most retail sales. Gross receipts tax is a separate tax that applies to alcohol at 7%, to new farm machinery used exclusively for agricultural production at 3% and to new mobile homes at 3%. A client that sells any of these needs a separate line in the ledger, because the state rate does not apply to them.
Cities and counties may also levy sales and use taxes, along with lodging, lodging and restaurant and motor vehicle rental taxes. The state says tax is calculated based on the North Dakota location where the sale is delivered, and it points to its Local Sales Tax Rate Locator for the correct rate. A client with a Fargo store that delivers to a Bismarck address charges the Bismarck rate. Tag each order with the delivery city at entry, and check any rate you did not look up yourself in the locator before filing.
Remote sellers and marketplace sales
The state's marketplace facilitator page says a facilitator without physical presence must collect once its taxable sales exceed $100,000 in the current or prior calendar year. A facilitator that first crosses the line must register and begin collecting within 60 days, or by January 1 of the following year if that comes first. The page describes this for facilitators, so apply the $100,000 test to a remote seller only after reading the state's own seller guidance.
For a client that sells through a marketplace, ask for the marketplace's monthly report showing which North Dakota sales the platform taxed. Sales the platform collected on should not be taxed a second time on the client's return, and sales made directly through the client's own site should be. Keep the two in separate columns.
Work out the penalty before you call the client
The state's page sets the late filing penalty at 5% or $5, whichever is greater, for the first month. Each additional month adds another 5%, up to 25% of the tax due. A separate late payment penalty is 5% of the unpaid tax, or $5, whichever is greater. The page does not say how the two combine, so read the notice before you quote a total.
For example, a client owes $2,000 of tax on a return filed two months late. The filing penalty is 10%, or $200. Interest is 12% per year from the deadline, and none is collected for the first month a return is late. On a $60 balance, 5% is $3, so the $5 minimum applies. I found no timely-filing discount on the state pages I read, so do not promise one to a client.
Collect these records every period
Send the client one request each month, before the filing date. Ask for: the sales report for the period by delivery city, the point-of-sale or processor report showing refunds, the marketplace report if any, the exemption or resale paperwork for each non-taxable sale and any gross receipts items listed separately. Hold the return until the sales report ties to the bank deposits and the processor payouts. In Usual you can make that a recurring request with a due date and automatic reminders, so the same list goes out each month.
Keep each return with the ND TAP confirmation and the support behind it. The state says records must be kept for three (3) years and three (3) months under North Dakota law. The pages I read do not address a zero return. File one for every period anyway, and ask the office if the client's permit is dormant.
Failure modes and fixes
A month-end due date generator misses the weekend shifts. In 2026 it would have put the September return on October 31, a Saturday, when the state's date was November 2. Pull the dates from the state's calendar, and recheck them each January.
A single rate for every sale ignores delivery location. If a client taxed $40,000 of delivered sales at the 5% state rate alone, the return shows $2,000 and any local tax is missing. Add the delivery city to the sales export, and look each rate up in the locator.
A client that opens a second location or adds a restaurant may need a new account with its own schedule. Ask at each quarterly check-in: "Did you open a location, add a restaurant or start selling alcohol since last quarter?" If yes, request the new permit letter.