US Sales Tax on Invoices, Explained
The United States has no national sales tax — instead, 45 states (plus DC and many local jurisdictions) each set their own rules, rates, and exemptions. For invoicing, that means where your customer is located often matters more than where you are. Here is how to handle sales tax on invoices without drowning in complexity.
Nexus: When You Must Collect Sales Tax
You must collect sales tax in a state where you have 'nexus' — a sufficient connection. Physical presence (an office, warehouse, or employee) creates nexus, but since the 2018 Wayfair decision, economic nexus also counts: most states set thresholds like $100,000 in sales or 200 transactions into the state per year. Sell into a state past its threshold and you must register and collect there.
Nexus is evaluated state by state. A freelancer selling services may have nexus in only one or two states, while an online seller shipping goods nationwide can trigger it in dozens. Track where your sales go; most states' revenue departments publish their thresholds clearly.
What Is Taxable Varies by State
Goods are taxable in most states, but services are a patchwork — professional services are often exempt while things like equipment repair or software access may be taxed, depending on the state. Digital products and SaaS are taxed in a growing number of states, each with its own definitions. Never assume the rules from your home state apply elsewhere.
Exemptions also vary: groceries, clothing, and manufacturing inputs are common carve-outs with different limits per state. If a customer claims exemption (for example, a reseller), collect a valid resale or exemption certificate before invoicing them tax-free — and keep it on file.
Showing Sales Tax on the Invoice
On the invoice, list the taxable subtotal, the sales tax rate applied, the tax amount, and the total. When multiple jurisdictions apply (state plus county plus city), you can show one combined rate or itemize each — itemizing is clearer for business customers who track deductions. Always use the rate for the customer's ship-to or service location, not your own address.
Keep the tax line separate from shipping and discounts. If an order mixes taxable and exempt items, show which lines are taxed. Clean line-item detail prevents disputes and makes audits far less painful.
Collecting, Filing, and Remitting
Collecting tax is only step one — you must file returns and remit the tax to each state on its schedule (monthly, quarterly, or annually, based on your volume). Filing deadlines and portals differ per state, and late filing draws penalties even if you owe little.
Sales tax software can calculate rates by address and automate filings, which is worth considering once you sell into several states. At minimum, keep a spreadsheet of where you are registered, each state's filing frequency, and due dates so nothing slips.
Frequently asked questions
Do I charge sales tax based on my location or the customer's?
Almost always the customer's — specifically the ship-to address for goods or where the service is performed or received. This is called destination sourcing, and most states use it. A few states use origin sourcing, so confirm the rule for each state where you have nexus.
Are services subject to sales tax?
Sometimes. Most states tax few professional services, but many tax specific ones like repair, cleaning, landscaping, or digital services. Check each state's taxable-services list rather than assuming services are exempt.
What is a resale certificate?
A document a buyer gives you certifying they will resell the goods, which lets you sell to them tax-free. You must collect and keep a valid certificate for each state where you make exempt wholesale sales, and verify it has not expired.
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