How do you reverse calculate sales tax?

To remove sales tax from a total price, divide the total by (1 + tax rate). If your receipt shows $107.00 and the tax rate is 7%: Pre-tax price = $107.00 ÷ 1.07 = $100.00. Tax amount = $107.00 − $100.00 = $7.00. This formula works for any tax rate — just convert the percentage to a decimal (7% = 0.07) and add 1.

What is a reverse sales tax calculator used for?

Reverse sales tax calculators are used when you know the total price paid (tax included) but need to find the pre-tax subtotal. Common uses: business accounting to separate tax from total receipts, expense reporting where you need to show the cost before tax, bookkeeping to record the taxable amount separately, and verifying that a store charged the correct tax on your purchase.

What are the sales tax rates by state?

State sales tax rates range from 0% (Alaska, Delaware, Montana, New Hampshire, Oregon) to 7.25% (California base rate). Common rates: Texas 6.25%, New York 4% state (+ local up to 4.875%), Florida 6%, Illinois 6.25%, Washington 6.5%. Most states allow additional local (city/county) taxes on top of the state rate, making the combined rate higher. California's combined rate can reach 10.25%+ in some cities.

Why is removing sales tax not the same as multiplying by the tax rate?

A common mistake is to multiply the total price by the tax rate to find the tax amount — this gives the wrong answer. For a $107 total with 7% tax: the wrong method gives $107 × 0.07 = $7.49 (this would be 7% of the total, not 7% of the pre-tax price). The correct method gives $107 ÷ 1.07 = $100.00, and $107 − $100 = $7.00. The difference matters for accounting accuracy, and the error compounds on large transactions.

How do I find the sales tax rate on my receipt?

Most receipts list the sales tax rate and amount as separate line items. If not, you can calculate it: divide the tax amount by the pre-tax subtotal. If a receipt shows $95.00 subtotal and $6.65 tax: rate = $6.65 ÷ $95.00 = 7.00%. Some receipts combine state and local taxes into one line; others break them out separately. If you cannot find the rate, look up the combined rate for your city at your state's department of revenue website.

Does sales tax apply to all purchases?

No — sales tax exemptions vary significantly by state. Most states exempt groceries (unprepared food), prescription drugs, and medical devices. Some states exempt clothing under a price threshold (e.g., New York exempts clothing items under $110). Sales to resellers with valid resale certificates are also typically exempt. Online purchases are taxable if the seller has nexus in your state — since the 2018 South Dakota v. Wayfair Supreme Court decision, most large online retailers collect sales tax in all states with a sales tax.

What is the difference between sales tax and VAT?

Sales tax is added at the point of final sale to the consumer and is collected by the retailer. VAT (Value Added Tax) is collected at each stage of the supply chain and is embedded in the final price — the consumer pays a price that already includes VAT. Most of Europe and many other countries use VAT. The US uses sales tax. This calculator works for US sales tax; if you're removing VAT from a price, the same formula applies since VAT is also expressed as a percentage of the pre-tax price.

Reverse Sales Tax Calculator — Pre-Tax Price & Tax

How to Use This Reverse Sales Tax Calculator

This reverse sales tax calculator removes tax from any total price instantly. Enter the total price as shown on your receipt (tax included) and the sales tax rate for your location. The calculator immediately shows the pre-tax price and the tax amount, with a verification line confirming that pre-tax + tax = your total. Adjust the tax rate to match your exact combined state and local rate. Use the Share button to save your calculation or send it to a colleague for expense reporting.

If you need to calculate how much a tip adds to your restaurant bill, the tip calculator handles tip amounts, totals, and per-person splits with quick-select buttons for common percentages.

How to Remove Sales Tax from a Total Price

The reverse sales tax formula divides the total by a factor that includes the tax rate:

Pre-tax Price = Total Price ÷ (1 + Tax Rate ÷ 100)
Tax Amount = Total Price − Pre-tax Price
Verification: Pre-tax Price + Tax Amount = Total Price

Example: $107.00 total with 7% tax. Pre-tax = $107.00 ÷ 1.07 = $100.00. Tax = $107.00 − $100.00 = $7.00. Note: multiplying $107 × 0.07 would give $7.49 — the wrong answer. Always divide the total by (1 + rate), never multiply the total by the rate.

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Sales Tax Rates by State (2026)

Sales tax rates vary by state and locality. Enter your combined (state + local) rate for the most accurate result. Here are the state base rates for common states:

No state sales tax: Alaska, Delaware, Montana, New Hampshire, Oregon (0%)
California: 7.25% state base (combined can reach 10.25%+ with local)
Tennessee: 7.00% (highest base rate)
Indiana, Mississippi, Rhode Island: 7.00%
New Jersey, Minnesota: 6.625% / 6.875%
Texas: 6.25% state (combined up to 8.25%)
Florida: 6.00% state (combined up to 7.5%)
New York: 4.00% state (combined NYC rate is 8.875%)
Colorado: 2.90% state (but combined often 8–10% with local)

Always use the combined rate for your specific city and county, not just the state base rate. Your state’s department of revenue website has a rate lookup tool for any zip code.

When to Use a Reverse Sales Tax Calculator

The most common use cases for reverse-calculating tax:

Business expense reports: Your company reimburses pre-tax costs; you need to separate the tax from a receipt total
Bookkeeping and accounting: Recording sales in your books requires separating the taxable revenue from the tax collected
Verifying a receipt: Confirming a store charged the right tax rate on your purchase
Pricing research: Understanding what a competitor charges before tax when you only see their posted price-inclusive price
VAT recovery: Businesses in VAT countries frequently reclaim input VAT and need the pre-VAT amount

The Common Mistake: Multiplying vs. Dividing

The most frequent error when reversing sales tax is multiplying the total by the tax rate instead of dividing by (1 + rate). Here is why this is wrong:

Wrong: $107 × 0.07 = $7.49 (this is 7% of the total-inclusive price)
Right: $107 ÷ 1.07 = $100.00, tax = $7.00 (this is 7% of the pre-tax price)

The difference of $0.49 may seem trivial on one receipt but adds up significantly in accounting. On $100,000 of tax-inclusive revenue at 7%, the error would overstate the tax by $654. Always use division with (1 + rate) for reverse tax calculations.

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Sales Tax on Business Purchases

Businesses that sell taxable goods collect sales tax from customers and remit it to the state — they act as agents for the tax authority. Businesses purchasing goods for resale typically provide a resale certificate to their supplier, exempting those purchases from sales tax. If you are calculating margin or profit on goods you buy and resell, use the pre-tax cost in your profit percentage calculation — the sales tax you collect is not your revenue.

Some business purchases remain taxable even for registered businesses: office supplies, employee meals, and non-resale equipment are common examples. Keep detailed records of which purchases qualify for resale exemption and which do not.

Sales Tax vs. VAT: Same Formula, Different System

Value Added Tax (VAT) is used in over 160 countries, including all EU member states, the UK, Canada (GST/HST), and Australia (GST). Like sales tax, VAT is expressed as a percentage and added to the pre-tax price. The reverse calculation formula is identical: Pre-tax = Total ÷ (1 + VAT Rate). A UK purchase of £120 at 20% VAT: pre-tax = £120 ÷ 1.20 = £100.00, VAT = £20.00.

The difference is structural, not mathematical: VAT is collected at every stage of the supply chain with input credits offsetting output tax, while US sales tax is only collected at the final consumer sale. The arithmetic to reverse-calculate either is the same.

Financial Disclaimer

This calculator is for informational purposes only. Sales tax rates shown are approximate and may not reflect current combined state and local rates for your specific location. Tax law changes frequently. Consult your state’s department of revenue for the exact rate applicable to your purchase, or consult a licensed tax professional for business tax obligations.

Reverse Sales Tax Calculator