Michigan has a reputation for having one of the simpler sales tax systems in the country. There is a single, flat 6% statewide rate, no local add-ons, and no rate variations by county or city.
But simplicity at the rate level does not mean compliance is without complexity. In our work with businesses operating in Michigan, the issues we see rarely involve the rate itself. They stem from process gaps: missing exemption certificates, overlooked use tax obligations, filing frequency changes that go unnoticed, and records that would not hold up under audit scrutiny. The cost of non-compliance, once penalties and compounding interest are factored in, consistently exceeds the cost of getting things right from the start.
Here is what business owners need to know.
Before any collection or filing obligations arise, a business must establish nexus in Michigan, meaning a sufficient connection to the state that triggers a registration requirement with the Michigan Department of Treasury.
Nexus can arise through a physical presence, such as an office, employees, or inventory in a Michigan warehouse, or through economic activity alone. Michigan's economic nexus threshold is $100,000 in annual sales or 200 or more separate transactions with Michigan customers in a calendar year. Remote sellers and e-commerce businesses shipping into Michigan should pay particular attention: once either threshold is crossed, registration is required regardless of physical presence.
Businesses selling through marketplace facilitators such as Amazon should confirm how tax collection responsibilities are allocated under their agreements. The facilitator may remit tax on third-party sales, but that does not eliminate all seller obligations. Operating without a sales tax license after crossing the nexus threshold creates back-tax exposure from the date nexus was established, not the date of registration. That gap is exactly what auditors look for.
Michigan levies a uniform 6% sales tax on the retail sale of tangible personal property and certain enumerated services. Because the state does not permit local jurisdictions to add to that rate, the 6% applies consistently everywhere in Michigan.
The companion obligation overlooked most often is Michigan's use tax, also at 6%. Use tax applies when a business purchases taxable items for use, storage, or consumption in Michigan and no sales tax was collected at the point of sale. This comes up regularly when businesses buy equipment, software, or supplies from out-of-state vendors that do not charge Michigan tax. Michigan auditors specifically look for this gap, and it is one of the more straightforward assessments for them to make.
Key Takeaway: The most common compliance gap is use tax on purchases from out-of-state vendors. It is easy to miss and a consistent focus area during audits.
Sales of tangible personal property are generally taxable at 6%. Michigan specifically taxes telecommunications and hotel and accommodation services, but most other services are not subject to Michigan sales tax. This includes professional services provided by law firms, medical practices, consulting firms, and architectural firms.
That said, professional service firms are not entirely off the hook. Physical products sold alongside services may be taxable, and use tax obligations on business purchases apply regardless of industry. For a broader look at how Michigan tax obligations intersect with business structure and planning decisions, our guide to Michigan Corporate Income Tax covers related considerations that often arise alongside sales and use tax compliance.
Key exemptions include groceries for home consumption (prepared and hot foods are generally taxable), prescription drugs and most qualifying medical devices, agricultural and manufacturing equipment used in production, purchases for resale with a valid exemption certificate, and qualifying nonprofits and government entities.
The exemption certificate used in Michigan is Form 3372. When a customer claims an exemption, the seller must obtain and retain a completed Form 3372. Michigan updated its exemption documentation procedures in July 2024 through Revenue Administrative Bulletin 2024-11. One of the most common issues we help clients correct is missing or incomplete exemption certificates, particularly for businesses with higher volumes of resale transactions. If you cannot substantiate an exempt sale during an audit, the Department of Treasury may hold you responsible for the uncollected tax, plus penalties and interest.
Key Takeaway: Ensure all exempt transactions are backed by current, properly completed exemption certificates. That documentation is your primary protection in an audit.
Businesses with Michigan nexus must register for a sales tax license before making their first taxable sale, through Michigan Treasury Online. According to the Michigan Department of Treasury's Filing Requirements FAQ, sales, use, and withholding taxes are reported together on a combined return, and registered businesses must file within their assigned frequency even if no tax is due in a given period.
Treasury assigns filing frequency based initially on estimated activity and subsequently on prior-year liability, reviewing it annually. Monthly and quarterly returns are due by the 20th of the following month or quarter-end month respectively. Annual returns are due by February 28.
A requirement monthly and quarterly filers often miss is the separate annual reconciliation return, also due February 28. It does not replace regular filings. Its purpose is to reconcile and close the tax year, and overlooking it is a common and avoidable mistake. Businesses with annual tax liability exceeding $720,000 are subject to an accelerated prepayment schedule.
Audit triggers include discrepancies between gross reported sales and tax remitted, unsupported exemption claims, inconsistent or late filing history, failure to file zero returns, and use tax gaps on out-of-state purchases. Failing to file at all removes the standard four-year look-back limit entirely.
Late filing carries a penalty of 5% for the first two months, with an additional 5% per month up to a maximum of 25% of tax owed. Interest compounds daily at an annual rate of 9.47% for the first half of 2025. Businesses with historical non-compliance may be able to limit exposure through Michigan's Voluntary Disclosure program, which typically restricts the look-back period to 48 months and may provide penalty relief.
The businesses that navigate audits successfully treat documentation and filing discipline as ongoing processes, not year-end exercises.
Key Takeaway: Audit risk in Michigan is primarily driven by documentation gaps and filing inconsistencies. Where historical issues exist, Voluntary Disclosure is generally the better path than waiting for an audit.
Sales and use tax compliance is one of those areas where small process gaps can compound into significant exposure over time. Our Sales and Use Tax services are designed to help businesses identify obligations, address gaps, and put processes in place that hold up under scrutiny. If you are thinking about how compliance fits into a broader tax strategy, our Tax Planning page covers how we approach that work with clients year-round.
Whether you are newly operating in Michigan or have been filing for years and want to confirm everything is in order, we can help. Contact us to schedule a Michigan sales tax compliance review.