Sellers collect a tax they never get to keep. Get it wrong, and someone else’s tax becomes your liability. That is the real reason sales tax matters for a business.
This guide covers what sales tax is, who actually pays it, how it hits your margins, and why understanding it protects your business. The stakes are compliance, pricing power, and your ability to expand into new states.
What Is Sales Tax?
Sales tax is a consumption tax on goods and some services, charged at the point of sale. The seller collects it from the buyer and remits it to the state. There is no federal sales tax in the United States. Rates stack across state, county, city, and special district layers, so the combined rate depends on the exact delivery address.
Louisiana holds the highest average combined state and local rate at 10.11%, with Tennessee second at 9.61%, per the Tax Foundation’s State and Local Sales Tax Rates, 2026 report. Louisiana’s state rate rose from 4.45% to 5.00% on January 1, 2025, which pushed it to the top.
Five states levy no statewide sales tax. The mnemonic is NOMAD: New Hampshire, Oregon, Montana, Alaska, and Delaware. Alaska carries a catch, shown below.
| State | Statewide sales tax rate | Local sales tax allowed? | Source |
|---|---|---|---|
| Alaska | None | Yes; 100+ municipalities levy local rates up to ~7.5% | Alaska Remote Seller Sales Tax Commission |
| Delaware | None | No | Tax Foundation, 2026 |
| Montana | None | No (narrow local resort taxes only) | Tax Foundation, 2026 |
| New Hampshire | None | No | Tax Foundation, 2026 |
| Oregon | None | No | Tax Foundation, 2026 |
A worked example makes the mechanics concrete. A $20 t-shirt taxed at 5% costs $21: $20 for the shirt plus $1 in tax. A $1,000 laptop taxed at 8% costs $1,080: $1,000 plus $80 in tax. A wholesaler buying that same laptop stock for resale pays no sales tax at all, because it presents a resale certificate and the tax lands later, on the end consumer.
Who Pays Sales Tax: the Buyer or the Seller?
The buyer pays sales tax. The seller collects it and remits it to the state. The twist that matters for businesses: if the seller fails to collect, the liability shifts to the seller, plus penalties and interest. The buyer’s tax becomes the seller’s debt.
When a customer buys a $100 item at a 7% rate, they pay $7 in tax, which the seller collects and forwards to the state. Business-to-business (B2B) sales for resale work differently. A seller owes no tax when the buyer provides a valid resale certificate in good faith, per California Department of Tax and Fee Administration (CDTFA) Publication 103. The tax is designed to hit the end consumer once, not every link in the supply chain.
Why Does Sales Tax Matter for Businesses?
Sales tax matters because mishandling it creates direct financial liability, while handling it well protects margins, pricing clarity, and your ability to expand. Uncollected tax becomes your debt. Correctly managed, it stays a pass-through. The difference between those two outcomes is process, and process is what protects the business.
How Does Sales Tax Compliance Protect Your Business?
Compliance prevents fines, penalties, interest, and back-tax liability. It starts with nexus: the connection that triggers a collection duty in a state. Physical nexus comes from offices, employees, or inventory, including Fulfillment by Amazon (FBA) stock. Economic nexus comes from crossing a sales threshold with no physical presence, established nationally by South Dakota v. Wayfair (2018).
Thresholds are not universal. South Dakota’s original standard was $100,000 or 200 transactions, but many states have since dropped the transaction count and set different sales figures.
| State | Sales threshold | Transaction count | Effective date | Source |
|---|---|---|---|---|
| California | $500,000 | None | Apr 1, 2019 | Commenda California guide |
| Texas | $500,000 | None | Oct 1, 2019 | Commenda Texas guide |
| New York | $500,000 | 100+ (both required) | Jun 21, 2018 | Commenda New York guide |
| Florida | $100,000 | None | Jul 1, 2021 | Commenda Florida guide |
| Colorado | $100,000 | None | Jun 1, 2019 | Commenda Colorado guide |
| Washington | $100,000 | None (count removed 2020) | Oct 1, 2018 | Commenda Washington guide |
| Illinois | $100,000 | 200 | Oct 1, 2018 | Commenda Illinois guide |
For the full state-by-state picture, see Commenda’s US nexus exposure thresholds guide. For process, read Sales Tax Compliance for Multi-State Businesses and the US sales tax compliance basics.
How Does Sales Tax Shape Your Pricing Strategy?
Sales tax changes the price your customer sees, so you must decide how to display it. The US convention is tax-exclusive pricing, added at checkout. Tax-inclusive pricing is common abroad and in cash-price businesses. Multi-state sellers face a different rate at every checkout, which is where automation earns its cost.
A surprise total at checkout adds friction and can cost conversions. Consistent, correct rates keep the buying experience clean and keep your quoted prices honest across every state you ship to.
How Does Sales Tax Knowledge Support Expansion Into New States?
Knowing a state’s threshold before you enter lets you register on time instead of discovering retroactive liability later. A fast-growing seller can cross an economic nexus threshold without noticing, then owe back tax from the crossing date, plus penalties.
The thresholds above, ranging from $100,000 in states like Florida and Colorado to $500,000 in California, Texas, and New York, tell you exactly when registration becomes mandatory. Checking them first turns expansion into a planned step, not a gamble.
How Does Sales Tax Affect Profit Margins?
Handled correctly, sales tax never touches your profit margin. It is a pass-through you collect for the state, so it is neither revenue nor expense. Handled wrong, it erodes margin directly. The old claim that sales tax simply does not affect margins is incomplete. Four failure paths pull money straight out of the business:
- Under-collection: if you fail to charge tax you owed, you pay it later from your own funds, plus penalties and interest.
- Absorbed tax: eating the tax to hold a clean price point comes straight out of margin.
- Compliance overhead: software, filing labor, and accountant fees are real operating costs.
- Cash-flow timing: collected tax is held in trust, not spendable cash; treating it as revenue creates a shortfall at remittance.
Accurate calculation is the fix. See sales tax software for e-commerce for how automation keeps collection correct at scale.
What Are the Pros and Cons of Sales Tax for Businesses?
For businesses, the pros are a simple point-of-sale tax, a broad and predictable base that funds the infrastructure they rely on, and no direct profit-and-loss (P&L) hit when handled correctly. The cons are multi-state complexity, a collection burden with no pay, and real liability risk. The table splits them.
| Pros for businesses | Cons for businesses |
|---|---|
| Collected at the point of sale, so it is simple to apply | Thousands of jurisdictions with changing rates and rules |
| Pass-through by design, with no P&L hit when handled right | Collection burden falls on the seller, usually uncompensated |
| Broad, stable base funds the roads and services businesses use | Errors create direct seller liability, plus penalties and interest |
| Clear thresholds enable confident, planned expansion | Regressive: it takes a larger income share from lower earners |
Sales taxes made up 31.18% of state tax collections nationally in fiscal year 2022, second only to individual income taxes, per the Tax Foundation’s sales tax revenue reliance data. That stability is why states enforce collection aggressively.
How Commenda Helps With Sales Tax Compliance
Understanding sales tax protects your business. Managing it manually across dozens of states does not scale. Commenda’s global indirect tax software tracks your physical and economic nexus exposure across states, calculates the correct rate at every checkout, and handles registration and filing, so a pass-through stays a pass-through and never leaks into your margin.
Use the US nexus exposure thresholds guide to see where your sales create an obligation, and the free US sales tax calculator to look up rates by address. Commenda connects to 100+ ERP, API, and custom integrations, so tax data flows straight from the platforms you already sell on.
Book a demo to get a free assessment of where your sales already create nexus exposure.
