State Tax vs Federal Tax vs Sales Tax: What's the Difference?

Three different taxes, three different governments, three different sets of rules. For a new U.S. business owner — especially a non-resident — "federal tax," "state tax," and "sales tax" often blur together. They are not the same thing, they are charged by different authorities, and you can owe one, two, or all three at once. Here is how each one works.

Federal Tax — Charged by the IRS

Federal tax is collected by the Internal Revenue Service (IRS) and applies nationwide, no matter which state you are in. For a business it usually means income tax on profit: a C-Corporation pays a flat 21% corporate rate, while an LLC's profit passes through to the owner's personal return and is taxed at individual rates. Federal tax also includes self-employment / payroll taxes (Social Security and Medicare, 15.3%) on earned income. Everyone doing business in the U.S. deals with the federal layer.

State Income Tax — Charged by Each State

State income tax is charged separately by the state where you earn income or operate, and it is completely independent of federal tax. Rates vary enormously: some states — Texas, Wyoming, Florida and others — have no state income tax at all; some use a flat rate; others apply graduated brackets above 10%. A few also charge a franchise tax or annual fee just to exist there. Which state's tax you owe depends on where the business actually operates — not always where it was formed.

Sales Tax — Charged on What You Sell

Sales tax is a transaction tax collected from your customer at the point of sale and remitted to the state (and often the county or city). It is not a tax on your profit — it is a tax on the sale itself, and you act as the collector. Since the 2018 Wayfair decision you can be required to collect sales tax in a state where you have no physical presence, simply because you sell enough into it ("economic nexus"). Most goods are taxable; many services and some items such as groceries are exempt or reduced. Five states have no statewide sales tax at all.

How They Stack — A Quick Example

An LLC selling products online to U.S. customers would face all three layers separately:

• Federal: the owner reports the LLC's profit and pays federal income tax (plus self-employment tax if it applies).
• State income tax: owed to the state(s) where the business has nexus — possibly $0 in a no-income-tax state.
• Sales tax: collected from customers in every state where the business has sales-tax nexus, then forwarded to those states.

A no-income-tax state does not exempt you from federal tax or from collecting sales tax. The three are calculated separately, paid to different authorities, and filed on different schedules.