How this page is reviewed
| Risk tier | High YMYL |
|---|---|
| Author | Calculover Editorial Team Finance and legal education |
| Editorial owner | Calculover Tax & Payroll Desk Tax and wage methodology owner |
| Reviewer | Calculover Editorial Review High-risk source and limitation review |
| Last reviewed | 2026-05-10 |
| Last verified | 2026-05-10 |
| Data effective date | 2026-01-01 |
Methodology
What Is Sales Tax? Definition & Calculator applies the tax-rate, threshold, and taxable-base logic documented in the calculator formula section, then separates user-entered assumptions from statutory or source-linked rate inputs.
Assumptions
- What Is Sales Tax? Definition & Calculator relies on the values the user enters and does not independently verify income, balances, legal status, policy terms, or market quotes.
- Taxable income, deductions, credits, filing status, jurisdiction, and timing are simplified to the fields available in the calculator.
- Federal, state, local, and international tax rules can change after the listed last-verified date.
Limitations
- What Is Sales Tax? Definition & Calculator does not prepare a tax return, determine final liability, apply every credit or deduction, or account for all state, local, foreign, penalty, or surtax rules.
- Confirm current forms, thresholds, and filing obligations with the IRS, the relevant tax authority, or a qualified tax professional before filing or paying tax.
Sources
- Federal Income Tax Rates and Brackets, Internal Revenue Service
- Estimated Taxes, Internal Revenue Service
Professional guidance: What Is Sales Tax? Definition & Calculator is for tax education and planning only and is not tax, legal, accounting, or filing advice. Verify current rules with the relevant tax authority or a qualified tax professional.
Sales tax is a consumption tax imposed by state and local governments on the sale of goods and services, typically added at the point of purchase.
How Sales Tax Works
When you buy a taxable item, the retailer adds the applicable state and local tax rate to the price. Rates vary significantly by location — from 0% in states like Oregon and Montana to over 10% in parts of Louisiana, Tennessee, and Arkansas when combining state and local rates.
Five states have no sales tax at all: Oregon, Montana, New Hampshire, Delaware, and Alaska (though Alaska allows local jurisdictions to impose their own).
What Is Taxable
Rules vary by state. Most states tax tangible goods but exempt groceries, prescription medications, and clothing (in some states). Services, digital products, and prepared food have varying treatment across jurisdictions.
Real-World Example
You buy a $1,200 laptop in Texas (6.25% state + 2% local = 8.25% total). Sales tax: $1,200 × 0.0825 = $99.00. Total cost: $1,299.00. The same laptop in Oregon would cost $1,200 — a $99 savings.
Frequently Asked Questions
Which states have no sales tax?
Oregon, Montana, New Hampshire, Delaware, and Alaska have no statewide sales tax. However, Alaska allows local municipalities to charge their own sales tax.
Is sales tax included in the listed price?
In the U.S., sales tax is almost always added at checkout — it is not included in the shelf price. This differs from many other countries (like those in Europe with VAT) where tax is included in the displayed price.
Do I pay sales tax on online purchases?
Yes. Since the 2018 Supreme Court ruling (South Dakota v. Wayfair), online retailers must collect sales tax in states where they have a significant business presence, which now covers most major retailers.