Sales Tax for Small Businesses, State by State

Sales tax is a state and local tax on the sale of certain goods and services. The U.S. doesn't have a national sales tax — instead, 45 states plus the District of Columbia and many local governments each set their own rules. For a small business, that means sales tax is one of the more confusing compliance areas, especially once you sell across state lines.

This is plain-English starter content, not tax advice. For your specific situation, talk to a CPA who handles multi-state filings. For broader context, see our Learn hub and business basics.

What sales tax actually is

When you sell a taxable item, you collect sales tax from the customer at the time of sale, hold it briefly, then remit (send) it to the state. You are essentially a tax collector for the state. Mishandling this money is a serious compliance issue, because it isn't your money to spend.

The USA.gov small business hub and the SBA both link to each state's sales tax authority.

Which states have sales tax

There are five NOMAD states with no statewide sales tax: New Hampshire, Oregon, Montana, Alaska, and Delaware. Even in these states, some local jurisdictions in Alaska charge local sales tax, and other taxes (like New Hampshire's meals and rooms tax) can apply.

Every other state, plus the District of Columbia, has a state sales tax — often topped up with city, county, transit, or special-district add-ons. Combined rates can easily reach 8% to 10% in cities. See our glossary entry on sales tax.

What is taxable

Each state writes its own list. As a rough guide:

• Tangible goods are usually taxable (clothing, electronics, furniture).
• Services are taxed in some states but not others. Personal services and professional services are often exempt; repair, installation, and certain digital services are increasingly taxable.
• Groceries are exempt or taxed at a reduced rate in many states.
• Prescription drugs are usually exempt.
• Digital products (e-books, downloads, SaaS) are taxed in a growing number of states.
• Resale items are exempt when you sell to a reseller who provides a valid resale certificate.

Nexus: when do you owe tax in a state?

Nexus is the legal connection that creates a sales tax obligation in a state. Two main types:

• Physical nexus. An office, warehouse, employee, inventory, or sometimes even an in-state contractor.
• Economic nexus. Sales into a state above a threshold dollar amount or transaction count, even with no physical presence.

After the U.S. Supreme Court's 2018 South Dakota v. Wayfair decision, almost every state adopted economic nexus rules. A common threshold is $100,000 in annual sales OR 200 transactions into that state — but the exact numbers vary, so check each state.

A walk through how it works

For example, imagine you sell handmade candles online from Texas:

1. Home state. You register for a Texas sales tax permit, collect Texas state and local tax on Texas customers, and file returns monthly, quarterly, or annually depending on volume.
2. Other states. You track your sales into each other state. Once you cross a state's economic nexus threshold (say, $100,000 in California sales), you register there, start collecting California tax going forward, and file California returns on California's schedule.
3. Marketplaces. If you sell on Amazon, Etsy, or similar, those marketplaces collect and remit sales tax for you under marketplace facilitator laws — but you may still need to register for filings.

This is general info, not tax advice; talk to a CPA before assuming where you do or do not need to register.

Registration and filing

Each state has its own portal. Most require:

• A valid EIN (or SSN for sole proprietors)
• Business legal name and address
• NAICS code for your industry
• Estimated monthly sales

Filing frequency depends on volume — high-volume sellers file monthly, smaller sellers quarterly or annually. Zero returns are still required in most states even if you had no sales that period.

Sales tax holidays

Many states run sales tax holidays — short periods (usually a weekend) when certain categories like back-to-school clothing, hurricane supplies, or Energy Star appliances are sold tax-free. Check your state's department of revenue for the current calendar.

Common mistakes

• Spending the sales tax money. Set up a separate transfer or savings bucket so the cash is there at filing time.
• Skipping a state where you have inventory. Storing goods in a third-party fulfillment warehouse usually creates physical nexus there.
• Late filings even with no sales. Most states penalize missed returns regardless of whether tax is due.
• Wrong rate at checkout. Use software or a state-published lookup tool, not memory. Local rates change.
• Forgetting use tax. If you buy taxable items from out of state without paying sales tax (and don't resell them), you usually owe use tax to your home state.

Penalties

Late or missed filings typically trigger a flat penalty plus monthly interest. Failing to remit collected sales tax can be treated as theft in some states, with personal liability for owners. Take this one seriously even when amounts are small.

How to actually keep up

A practical multi-state sales tax system for a small business looks something like:

1. Track sales by state. Your e-commerce platform or a sales-tax automation tool can do this automatically.
2. Watch your top non-home states monthly. When you cross 60% to 80% of a state's threshold, register before you cross it.
3. Use a rate-lookup tool at checkout. Don't rely on a flat statewide rate — local rates often add 1% to 4%.
4. Set sales tax aside in a separate account the moment it's collected.
5. Calendar your filing due dates. A missed quarterly return triggers penalties even on $0 of activity.
6. Ask your CPA about a "voluntary disclosure agreement" if you discover you should have been collecting in a state and weren't — many states offer reduced penalties for businesses that come forward voluntarily.

For very small e-commerce operations selling under $100,000 a year nationwide, the home state plus marketplace facilitator collection often covers most of the picture. As soon as you scale or sell direct-to-consumer in volume, multi-state compliance gets serious — and that's usually when sales tax automation software pays for itself.

A note on the numbers

State rates, nexus thresholds, taxable categories, and filing schedules change every year. Always confirm with each state's department of revenue before relying on any specific number.

Tax laws and SBA programs change every year — always check the latest at IRS.gov, SBA.gov, and your state's Secretary of State website.