Sales Tax for Small Businesses — When to Register and How to File (2026)

Do You Need to Collect Sales Tax?

Not every business needs to collect sales tax. Whether you do depends on nexus — your connection to a state that triggers a sales tax obligation. There are two types:

• Physical nexus — you have a physical presence (office, warehouse, employees) in the state
• Economic nexus — you exceed a sales threshold in the state (typically $100,000 in revenue or 200 transactions per year)

If you have nexus in a state, you must register, collect sales tax from customers, and remit it to the state.

Good news: Five states have no sales tax at all — Alaska, Delaware, Montana, New Hampshire, and Oregon.

What's Taxable and What's Exempt?

Rules vary by state, but general patterns:

Typically Taxable:

• Physical products (electronics, clothing, furniture)
• Some digital products (software, downloads — varies by state)
• Certain services (depends heavily on the state)

Typically Exempt:

• Groceries (most states exempt unprepared food)
• Prescription medications
• Most professional services (legal, accounting, consulting)
• Business-to-business resale purchases (with a resale certificate)

Key point for freelancers: Most states don't tax services like web development, consulting, design, or writing. But some do — always check your specific state.

When Should You Register Voluntarily?

Even if you're below the threshold, there are reasons to register:

Register when:

• You're approaching the threshold — better to be ready than caught off guard
• You sell physical products online — economic nexus can trigger in multiple states
• You want to buy inventory tax-free — a sales tax permit lets you use resale exemptions

Skip registration when:

• You only sell exempt services — no point in the paperwork
• You're well below thresholds in all states — keep it simple
• You're just starting out — focus on revenue first

How to Register for Sales Tax

1. Apply for a sales tax permit with your state's department of revenue (usually free, online)
2. Register in each state where you have nexus
3. Start collecting tax from the date of registration
4. Some states require a security deposit for new registrants

Multi-state sellers: Consider using the Streamlined Sales Tax Registration System (SSTRS) to register in multiple states at once.

Sales Tax Rates in the US

Sales tax varies wildly by location:

• State rates: 0% to 7.25% (California is highest)
• Local additions: Cities and counties can add 0.5%–5%+
• Combined rates: Can reach 10%+ in some areas

The average combined rate across the US is about 7.1%.

Example: A customer in Chicago pays:

• Illinois state: 6.25%
• Cook County: 1.75%
• Chicago city: 1.25%
• Total: 10.25%

How Sales Tax Collection Works

The mechanism is straightforward:

You collect sales tax from customers and remit it to the state. You're essentially acting as a tax collector — the money was never yours.

1. Charge the appropriate rate at the point of sale
2. Track all collected tax separately from revenue
3. File a return and remit the tax on schedule

Origin vs. destination-based: Some states tax based on where the seller is located (origin), others based on where the buyer is (destination). Most states are destination-based.

Filing Sales Tax Returns

You'll file returns on a monthly, quarterly, or annual schedule depending on your sales volume. Most states assign your frequency when you register.

Filing deadlines vary by state, but typically:

• Monthly: Due by the 20th of the following month
• Quarterly: Due by the 20th of the month after the quarter ends
• Annually: Due in January for the prior year

Many states offer a small filing discount (1-3%) for remitting on time — free money for doing what you should be doing anyway.

Online Sales and Economic Nexus

Since the 2018 South Dakota v. Wayfair Supreme Court decision, states can require out-of-state sellers to collect sales tax based on economic activity alone.

Common thresholds:

• $100,000 in sales, OR
• 200 transactions in the state

If you sell on Amazon, Etsy, or Shopify, the marketplace may handle sales tax collection for you (marketplace facilitator laws). But you're still responsible for understanding your obligations.

Sales Tax for Service Businesses

Most states don't tax professional services, but notable exceptions include:

• Hawaii — taxes nearly all services (GET, not technically sales tax)
• New Mexico — broad service taxation (GRT)
• South Dakota — taxes many services
• Some states tax specific services — IT services, landscaping, personal care

SaaS (Software as a Service): Taxability is a patchwork. Some states tax it as tangible personal property, others exempt it, and some are still figuring it out.

Common Mistakes

1. Ignoring economic nexus — selling online can create obligations in dozens of states
2. Missing filing deadlines — penalties add up quickly
3. Collecting the wrong rate — use the customer's location for destination-based states
4. Not keeping exemption certificates — if you don't collect tax on a B2B sale, you need documentation
5. Failing to file zero returns — most states require you to file even when you owe nothing

Exempt vs. Taxable — Quick Reference

How Freenance Can Help

Managing sales tax means tracking every sale by location, calculating the right rates, and setting aside funds for remittance. Freenance helps you monitor your cash flows, plan for tax payments, and make sure you're never short when it's time to file.

👉 Try Freenance for free and keep your small business finances in one place.