Sales Tax Nexus in Michigan: What Online Sellers Need to Know

The Short Answer

Michigan triggers sales tax obligations at $100,000 in sales OR 200 transactions (prior calendar year). What makes Michigan unusual: it requires sellers to count all their Michigan sales — including marketplace-facilitated sales — when calculating the threshold. Single flat rate with no local additions, which makes things simpler once you're registered.

Economic Nexus Threshold

• Dollar threshold: Over $100,000 in sales (taxable and nontaxable) into Michigan
• Transaction threshold: More than 200 transactions into Michigan
• Either/Or: Meeting either triggers the obligation
• Measurement period: Prior calendar year only (Michigan looks back at the prior year, not the current year)
• Effective date: October 1, 2018

Michigan's prior-year-only measurement is different from states that check current year progress throughout the year. Your filing requirement for any given calendar year is based entirely on the prior year's numbers.

Does Michigan Count Marketplace Sales Toward Your Threshold?

Yes — and this is critical. Michigan is one of the states (like California and Washington) that requires sellers to aggregate all channels — direct sales AND marketplace-facilitated sales — when calculating whether they've crossed either threshold.

This means if you made $80,000 through your Shopify store and $50,000 through Amazon into Michigan last year, your Michigan total is $130,000 — and you have a Michigan nexus obligation this year.

Once registered, the marketplace handles tax collection and remittance on facilitated sales; you collect on direct sales. But both counted to determine whether you needed to register in the first place.

What Taxable Products Look Like in Michigan

Michigan: one rate, statewide, no local taxes, no county additions anywhere in Michigan. It's about as simple as sales tax rate calculation gets.

• Clothing: Taxable — Michigan has no clothing exemption
• Groceries/Food: Most food for home consumption is exempt. Prepared food and restaurant meals are taxable.
• SaaS and digital goods: Michigan's SaaS taxability is nuanced. Prewritten software sold on a physical medium or downloaded is taxable. However, pure SaaS (no software transferred, accessed entirely in the cloud) may not be taxable under Michigan's current framework, which requires a transfer of property. This remains an evolving area — Taxero flags this for customers who sell SaaS products into Michigan.

How to Register in Michigan

Michigan is not an SST member. Register via Michigan Treasury Online (MTO):

• Portal: mto.treasury.michigan.gov
• Cost: Free
• Timeline: A few business days
• Authority: RAB 2021-21 and RAB 2021-22 are the key administrative bulletins governing remote sellers and marketplace facilitators

Filing Requirements

Michigan assigns filing frequency based on annual liability:

• Monthly: Annual liability over roughly $720/year
• Quarterly: Under $720/year
• Annual: Very small filers

Due date: 20th of the month following the reporting period. File Form 5080 or 5082 electronically via Michigan Treasury Online.

What Happens If You Don't Register

Michigan's penalty structure:

• Late payment penalty: 5% per month, maximum 25%
• Failure to register: $100 to $500
• Interest: Rate set by Revenue Administrative Bulletin

Michigan has a voluntary disclosure program. Past-period exposure can typically be resolved with a limited lookback.

How Taxero Handles Michigan

Michigan's "aggregate all channels" threshold rule is a common compliance blind spot — sellers who think their Amazon Michigan sales don't count toward their threshold get surprised. Taxero combines your full Michigan picture (all channels), evaluates it against the prior-year measurement period, and notifies you when registration becomes required. We handle MTO registration and quarterly filings at Michigan's flat rate.

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