Missouri Economic Nexus Threshold: $100,000 Revenue-Only Rule From the Last State to Adopt Remote-Seller Law

Why Missouri Waited: The Revenue-Neutrality Standoff

Most states rushed to adopt economic nexus rules after Wayfair. Within 18 months of the June 2018 decision, more than 40 states had enacted or updated their remote-seller collection requirements. Missouri was the conspicuous holdout — not because the state lacked a sales tax (Missouri's combined state and local rates rank in the top half nationally) but because of a political fight over what to do with the money.

The core dispute: a faction of Missouri legislators argued that requiring remote sellers to collect sales tax would amount to a net tax increase on Missouri residents unless offset by cuts elsewhere. They insisted any economic nexus bill be paired with reductions in the individual income tax rate. This revenue-neutrality requirement killed multiple bills in the 2019 and 2020 sessions, even though remote-seller collection had bipartisan support in principle.

Senate Bill 153, signed June 30, 2021, broke the impasse by coupling the new collection authority with a phased reduction in Missouri's top individual income tax rate — from 5.4% down to 4.95% over several years, contingent on revenue triggers. The bill gave the Missouri Department of Revenue 18 months to build out the registration and compliance infrastructure, setting the January 1, 2023 effective date.

For sellers, this history matters for one practical reason: there is a four-and-a-half-year gap between Wayfair and Missouri's collection requirement. During that window, remote sellers had no obligation to collect Missouri sales tax (absent physical nexus). But Missouri buyers were supposed to self-remit use tax on their purchases — a requirement that went largely unenforced for individual consumers but that creates potential exposure for B2B transactions.

The $100,000 Threshold: Revenue-Only, Rolling 12-Month Lookback

Missouri's economic nexus standard is straightforward compared to states that use dual prongs. The threshold is $100,000 in aggregate gross receipts from the sale of tangible personal property delivered into Missouri during the previous 12-month period. Key details:

The rolling 12-month lookback is worth noting. Unlike states that use the preceding or current calendar year (which resets on January 1), Missouri's rolling window means your threshold calculation is continuous. If you cross $100,000 in Missouri sales during any trailing 12-month period, nexus triggers immediately. For a comparison of how different states handle lookback periods, see our guide on economic nexus lookback periods.

The revenue-only standard — no transaction count prong — places Missouri in the same category as California's $500,000 revenue-only threshold and Massachusetts's $100,000 revenue-only rule. This means low-ticket, high-volume sellers — the type most commonly caught by transaction-count thresholds in states like New Jersey — won't trigger Missouri nexus until they actually hit $100K in revenue.

Registration via MyTax Missouri

Remote sellers register for a Missouri sales tax license through the MyTax Missouri portal (mytax.mo.gov). The process is the same for remote and in-state sellers:

1. Create a MyTax Missouri account with your email and a secure password.
2. Select "Register a New Business" and choose the sales tax registration option.
3. Provide business details: federal EIN (or SSN for sole proprietors), legal business name, business structure, NAICS code, and mailing address.
4. Indicate remote-seller status: You'll specify that you have no physical location in Missouri. There is no separate "remote seller" license type — you receive a standard Missouri sales tax license.
5. Estimate monthly Missouri sales volume: This determines your initial filing frequency assignment (monthly, quarterly, or annual).
6. Receive your Missouri sales tax license number: Typically issued within a few business days for online registrations.

One administrative note: Missouri's state sales tax rate of 4.225% is itself composed of four separate levies (general revenue at 3.0%, conservation at 0.125%, education at 1.0%, and parks/soils at 0.10%). However, you remit these as a single combined rate — you don't need to break them out on your return. Local taxes (city and county) are reported separately on the same return, identified by the specific jurisdiction code for each delivery address.

Filing Frequencies, Due Dates, and the Timely-Filing Discount

Missouri assigns your filing frequency based on average monthly sales tax liability:

Missouri offers a timely-filing discount of 2% of the tax you collected during the period, capped at $500 per return. This is a meaningful incentive — a monthly filer collecting $10,000 in Missouri sales tax saves $200 per filing (hitting the $500 cap only at $25,000 in collections). The discount is automatically applied when you file and remit by the due date. Late filing forfeits the discount entirely.

All returns are filed electronically through the MyTax Missouri portal. Paper filing is generally not available for remote sellers.

Marketplace Facilitator Rules: Same Effective Date, Same $100K Threshold

Missouri's marketplace facilitator law launched alongside the remote-seller economic nexus provision on January 1, 2023. Marketplace facilitators that exceed $100,000 in Missouri sales must collect and remit sales tax on all transactions they facilitate — including third-party seller sales. For a broader look at which platforms qualify and how coverage varies, see our marketplace facilitator laws by state comparison.

What this means for sellers:

• Amazon FBA, Etsy, Walmart Marketplace, eBay: These platforms collect and remit Missouri sales tax on facilitated sales. If 100% of your Missouri sales flow through these platforms, you generally do not need to separately register with Missouri.
• Shopify, WooCommerce, BigCommerce (direct channel): These are not marketplace facilitators. Sales through your own website count toward your individual $100,000 threshold and are your responsibility to collect and remit. As always, Shopify is not a marketplace facilitator.
• Mixed-channel sellers: If you sell $60,000 through Amazon and $50,000 through your Shopify store into Missouri, Amazon handles its $60K. Your Shopify sales independently exceed $100K? No — but you still need to track them. The $100K threshold for your direct obligation counts only your non-facilitated sales in most interpretations, though Missouri's guidance suggests reviewing total sales to determine whether registration is required.

Missouri's Local Tax Complexity: Not as Bad as Colorado, But Not Simple

Missouri has over 2,500 local taxing jurisdictions — cities, counties, and special districts that layer their own sales tax on top of the 4.225% state rate. Combined rates range from 5.225% in low-tax rural areas to over 10% in parts of Kansas City and St. Louis County. Unlike Colorado's home-rule cities, Missouri's local taxes are state-administered. You file a single return with the Missouri DOR that covers both state and local taxes.

The complication is destination-based sourcing. Missouri requires you to collect the combined state and local rate at the delivery address of the buyer, not your business location. With 2,500+ jurisdictions, each with its own rate, accurate rate determination requires tax automation software or a reliable address-to-jurisdiction lookup. The Missouri DOR provides a free tax rate lookup tool, and major platforms like TaxJar, Avalara, and Vertex maintain Missouri jurisdiction databases.

The good news: because local taxes are state-administered, you don't need to register separately with each city or county. One registration with the Missouri DOR covers everything. This is dramatically simpler than Colorado's home-rule system, where you may face separate registrations and filings for each self-administering city.

Pre-2023 Use-Tax Exposure: The Hidden Risk of Late Adoption

Missouri's late adoption creates a specific risk that doesn't exist in states that moved quickly after Wayfair. Between June 2018 (Wayfair) and January 2023 (Missouri's effective date), remote sellers shipped goods to Missouri buyers without collecting sales tax — because they had no legal obligation to do so. But Missouri buyers were technically required to self-remit use tax on those untaxed purchases.

In practice, individual consumers almost never self-remit use tax. But the exposure is different for B2B sales:

• Missouri businesses are subject to audit: If the Missouri DOR audits a Missouri business and finds untaxed purchases from 2019–2022, the buyer owes the use tax, plus interest and potentially penalties. This can create friction with your customers even though you, as the seller, had no collection obligation.
• Buyers may demand retroactive invoicing: Some Missouri businesses may ask you to retroactively issue invoices with tax or to provide documentation showing no tax was required during the pre-2023 period. Having clear records of when you started collecting is important.
• The statute of limitations matters: Missouri's standard statute of limitations for sales/use tax assessments is three years from the date the return was filed (or due). For the pre-2023 period, the clock may have started ticking based on the buyer's annual use-tax return filings. As of 2026, most 2022 and earlier exposure is approaching or past the limitation window, but not all of it — especially for buyers who failed to file use-tax returns at all.

What Missouri's $100K Threshold Means Compared to Neighboring States

Missouri sits in the geographic center of the US, bordered by eight states — more than any other state except Tennessee. For sellers shipping regionally, understanding how Missouri's threshold compares to its neighbors is useful:

Missouri's $100,000 revenue-only threshold is in line with the regional consensus. The key differentiator is the effective date — Missouri came online more than four years after Illinois and Kentucky, and roughly two years after Kansas. For sellers already compliant in Missouri's neighboring states, adding Missouri in 2023 was largely a matter of extending existing processes to one more jurisdiction rather than building from scratch.

What This Means for Your Business

Missouri's economic nexus threshold is one of the most straightforward in the country: $100,000 in revenue, no transaction count, state-administered local taxes, and a single filing portal. The complications come not from the rule itself but from its late arrival:

• If you're already selling into Missouri above $100K: You should have registered effective January 1, 2023. If you missed this date, consider reaching out to the Missouri DOR about a voluntary disclosure agreement to limit back-assessment exposure and waive penalties from the effective date forward.
• Track the rolling 12-month window carefully: Unlike calendar-year states where you get a clean reset on January 1, Missouri's rolling lookback means you can trigger nexus any day of the year. Set up automated monitoring if you're approaching the $100K line.
• Claim the timely-filing discount: The 2% discount (up to $500 per period) is free money for on-time filers. Automate your filing deadlines to avoid forfeiting it.
• Prepare for B2B customer questions about pre-2023 periods: If you sold to Missouri businesses before 2023 without collecting tax, be ready with documentation showing you had no collection obligation. This protects both you and your customers in the event of a Missouri DOR audit.
• Leverage destination-based sourcing tools: With 2,500+ local jurisdictions, manual rate lookups are impractical at scale. Invest in automated tax determination for Missouri addresses.