To file Michigan sales tax online, you register for a sales tax license through Michigan Treasury Online (MTO), then submit Form 5080 and pay the 6% tax by the 20th of the month after each monthly or quarterly reporting period. An annual reconciliation on Form 5081 is due February 28 of the following year. Everything runs through the state’s free portal at mto.treasury.michigan.gov.
Get a Sales Tax License Before You File
You cannot file a return without a license, and Michigan does not charge for one. The fastest route is the eRegistration process inside MTO. The system typically authenticates your application within 10 to 15 minutes, and the license becomes available to print from your MTO account immediately.1Michigan Department of Treasury. Sales Tax License FAQ You can also mail Form 518, but that takes longer.
Have your Federal Employer Identification Number (FEIN) or Treasury Number ready, along with your business name, address, and a description of what you sell. Keep the license current even if a marketplace handles all of your tax collection, because Michigan may still require you to file zero-dollar returns for the periods when you had no direct taxable sales.
Who Has to File
Michigan imposes its 6% sales tax on anyone “engaged in the business of making sales at retail” in the state.2Michigan Legislature. Michigan Compiled Laws 205.52 For online sellers, that comes down to nexus. If you keep inventory, employees, an office, or a warehouse in Michigan, you have physical-presence nexus and collect on every Michigan sale regardless of volume.
Remote sellers without a physical footprint have to collect once they cross either of two economic thresholds during the previous calendar year: more than $100,000 in gross receipts from Michigan sales, or 200 or more separate transactions with Michigan buyers. Either one is enough on its own.3Michigan Legislature. Michigan Compiled Laws 205.52c – General Sales Tax Act Watch your running totals. Most back-tax problems start when a growing business drifts past the $100,000 line without noticing.
If You Sell Through a Marketplace
Platforms like Amazon, Etsy, eBay, and Walmart Marketplace are required to collect and remit Michigan sales tax on the sales they facilitate, whether or not the platform itself has a physical presence in the state.4Michigan Legislature. Michigan Compiled Laws 205.52d – Marketplace Facilitators That only covers transactions that happen on the platform. Sales from your own website, from craft fairs, or through any other channel are still your responsibility to collect, report, and pay.
When you file, do not include sales a marketplace already collected tax on. Form 5081 specifically instructs marketplace sellers to exclude those transactions, and reporting them anyway inflates your numbers and can draw an audit notice.
Filing Frequencies and Due Dates
Treasury assigns your filing frequency when you register, based on your estimated tax liability. Lower-volume businesses file quarterly or annually; higher-volume sellers file monthly. You will be notified of your schedule.
- Monthly filers: returns are due by the 20th of the following month. January sales are reported on a return due February 20.
- Quarterly filers: returns are due April 20, July 20, October 20, and January 20 of the following year.
If the 20th lands on a weekend or holiday, the deadline moves to the next business day.5Michigan Department of Treasury. Sales and Use Taxes
Preparing Form 5080 and Worksheet 5095
Regular monthly and quarterly filings use Form 5080, the Sales, Use and Withholding Taxes Monthly/Quarterly Return.6Michigan Department of Treasury. 2026 Sales, Use and Withholding Taxes Monthly/Quarterly Return At the top of the form, enter your business account number and the return period. The actual math happens on Worksheet 5095, which feeds the final figures into Form 5080.
On Worksheet 5095, start with gross sales, then subtract allowable deductions to arrive at your taxable base. The worksheet gives you separate lines for resale transactions, interstate commerce, food for home consumption, government sales, bad debts, delivery and installation charges, and industrial processing exemptions.7Michigan Department of Treasury. Worksheet 5095 Instructions Multiply the taxable total by 6% to get the tax due, and carry that figure to Form 5080.
A quick example: if gross Michigan sales for the month were $25,000, with $3,000 in exempt resale transactions and $2,000 in exempt food sales, your taxable base is $20,000 and the tax due is $1,200.
If you accepted exemption claims from resale buyers or other exempt purchasers, you need Michigan Form 3372, the Sales and Use Tax Certificate of Exemption, on file for each one. A seller who cannot produce a valid certificate during an audit becomes liable for the uncollected tax, plus penalties and interest. Records can be stored electronically.8Michigan Department of Treasury. Form 3372 – Michigan Sales and Use Tax Certificate of Exemption
Submitting and Paying Through Michigan Treasury Online
Log in at mto.treasury.michigan.gov, select the correct tax year and period, enter the figures from your completed Form 5080, and submit. The portal walks you through each step.9Michigan Treasury Online. Michigan Treasury Online
Payment runs through MTO’s Paymentus system, which offers three methods:10Michigan Department of Treasury. MTO Electronic Payments
- EFT or eCheck pulls directly from your bank account at no charge. This is the best option for most businesses.
- Debit card payments carry a flat $3.95 fee per transaction.
- Credit card payments carry a 2.3% convenience fee charged by the payment processor.
On a $1,200 tax payment, the credit card fee alone would be $27.60, which is why most regular filers stick with EFT. If your bank has an ACH debit block, you need to authorize Treasury’s transactions before the payment can process. Save the confirmation number as proof after each filing.
Michigan also offers a small on-time payment discount, applied against the first portion of the tax rate. Paying early in the month can nudge the discount up slightly. The amounts are modest per filing but add up over a year for higher-volume sellers.
Annual Reconciliation on Form 5081
In addition to your monthly or quarterly returns, Michigan requires an annual reconciliation on Form 5081. It covers sales tax, use tax, and withholding tax for the full year and is due by February 28 of the following year.11Michigan Department of Treasury. Form 5081 – Sales, Use and Withholding Taxes Annual Return For tax year 2025, the deadline was February 28, 2026.
Form 5081 serves as a cross-check against the Form 5080 returns you filed during the year, broken out into more granular detail. Report total gross sales, separate out use tax, and include withholding tax if it applies to you. Again, exclude any sales a marketplace facilitator collected tax on.
Penalties and Interest for Late Filing
Missing a deadline triggers an automatic penalty. If you fail to file or pay on time, Michigan adds a penalty of 5% of the tax owed for the first two months, then another 5% for each additional month of delinquency, capped at 25% of the unpaid tax.12Michigan Legislature. Michigan Compiled Laws 205.24 – Failure or Refusal to File Return or Pay Tax
Interest runs on top of the penalty. For the second half of 2026, Michigan’s daily interest rate is 0.0002150, which comes to an annual rate of 7.85%. The rate sits one percentage point above the adjusted prime rate charged by major commercial banks and is updated twice a year through a Revenue Administrative Bulletin.13Michigan Department of Treasury. Revenue Administrative Bulletin 2026-5 Interest accrues from the original due date until you pay in full, calculated on the actual number of days the balance stays outstanding.
To see what that looks like: on a $2,000 return filed four months late, the penalty alone is $200 (10% of the tax), with interest building on the combined balance. The charges compound quickly across multiple missed periods. If you cannot pay in full by the deadline, file the return on time anyway. The penalty for not filing is typically worse than the penalty for filing without full payment, and filing on time shows Treasury you are acting in good faith.