ClutchCalcs

Math

Sales Tax Calculator

Two situations, one calculator: (1) you're looking at a price and need to know the final total with tax — "is this $200 fan really going to cost $215 at checkout?" (2) Your receipt or invoice shows the final total only and you need to back out the pre-tax price for expense reports, tax filings, or comparison shopping across tax jurisdictions. Pick the mode, enter the price and tax rate, get the answer. Works with any tax rate — cities, counties, and special districts all add their own piece on top of the state rate. Most US sales tax rates land between 0% (Delaware, Montana, NH, OR) and 10.5% (Chicago, certain CA cities).

Enter a price and tax rate.

The two modes

Add tax mode: enter the pre-tax price + tax rate, get the total with tax. Math: total = price × (1 + rate/100). Example: $49.99 at 7.5% = $53.74.

Strip tax mode: enter the final total (post-tax) + tax rate, get the pre-tax price. Math: pre-tax = total / (1 + rate/100). Example: $53.74 at 7.5% = $49.99. Useful for receipts that only show final total, or for backing out tax from gross sales for reporting.

US sales tax landscape

Each state sets its own base sales tax rate, and counties / cities / special districts pile on additional local rates. Some states have no sales tax at all.

  • 0% sales tax states: Delaware, Montana, New Hampshire, Oregon, Alaska (but Alaska has local sales taxes)
  • Lowest combined rates: Hawaii ~4.4%, Wyoming ~5.4%, Wisconsin ~5.4%, Maine ~5.5%
  • Highest combined rates: Louisiana ~9.5%, Tennessee ~9.5%, Arkansas ~9.5%, Washington ~9.4%, Alabama ~9.3%
  • State-only rates: California 7.25%, Texas 6.25%, Florida 6%, New York 4%, Illinois 6.25%
  • Combined city+county+state high spots: Chicago 10.25%, Long Beach CA 10.25%, Birmingham AL 10%, Memphis 9.75%

Online purchases since the 2018 Wayfair decision are typically taxed at the buyer's location rate, not the seller's. Sellers collect and remit to each state where they have economic nexus.

How to use this calculator

  1. Pick mode: Add tax (forward) or Strip tax (reverse).
  2. Enter price: pre-tax for Add mode; final total for Strip mode.
  3. Enter tax rate: combined state + local in percent. Find your local rate at the state department of revenue website or look at any recent local receipt.
  4. Output: total with tax (Add mode) or pre-tax price (Strip mode), plus the tax amount itself.

Common scenarios

Buying a $1,500 sofa in Cook County (Chicago), 10.25% tax. Total = $1,653.75. Tax $153.75. Worth checking if a suburb 10 minutes away has a 7% rate — saves $48.75.

Expense report shows $145.20 dinner receipt, need to break out tax. Local rate 8.5%. Pre-tax = $145.20 / 1.085 = $133.83. Tax = $11.37. Pre-tax meal expense $133.83 goes on the report; tax is non-reimbursable in many policies.

Comparison shopping: $850 at Target vs $830 at Amazon with $4 shipping. Target with local 6.5% tax: $850 × 1.065 = $905.25. Amazon with same 6.5% tax: $834 × 1.065 = $888.21. Amazon wins by $17. Knowing the math at the moment of decision matters.

FAQ

Why doesn't this know my local rate? +
Sales tax rates are jurisdiction-specific to the city + county + special district level. There are 12,000+ sales tax jurisdictions in the US, with rates that change quarterly. Easiest path: check a recent receipt from a local purchase and type that rate.
Is shipping taxed? +
Depends on state. About 30 states tax shipping when the items being shipped are taxable; about 20 states don't tax shipping. Some states tax shipping only if it's stated as part of the sale (not separately invoiced). For e-commerce business decisions, talk to a CPA or tax advisor.
What about food and prescription drug exemptions? +
Most states exempt prescription drugs and many exempt unprepared groceries. Prepared food (restaurant meals, deli, hot food) is usually taxed. Clothing exemptions vary by state. Always check your state's specific rules — the headline sales tax rate doesn't apply to everything.
What about "tax holidays"? +
Several states offer annual tax-free weekends (typically back-to-school in August) where clothing, school supplies, computers, etc. up to certain prices are exempt from sales tax. Texas, Florida, and Tennessee are major participants. Check your state's revenue website.
Can I deduct sales tax on my federal taxes? +
Yes, you can deduct EITHER state income tax OR state sales tax (not both) if you itemize. For taxpayers in no-income-tax states (FL, TX, WA, NV, etc.) the sales tax deduction is the only state-level option. Most filers under the 2017 doubled standard deduction don't itemize, making the choice moot for them.
What's use tax? +
Use tax is the sales tax equivalent for items you buy from out-of-state sellers who don't collect your state's sales tax. Many states require you to self-report use tax on big-ticket out-of-state purchases. Most consumers ignore this, but it's technically required and increasingly enforced for large transactions.
Does the calculator handle tax exclusion zones? +
No — it does a single-rate calculation. For mixed cart situations (some items taxed, some exempt), calculate each separately and add. Most receipts already break out tax separately, making this easy.
Why does my receipt rate differ from what I expected? +
Likely a special district (transit, sports stadium, downtown improvement) adding 0.25-1% to the headline rate. Or your zip code is in a higher-tax pocket within the city. Receipts from big chains usually show the precise breakdown if you look closely.