What is the average combined US sales tax rate?

The average combined state and local sales tax rate in the US is approximately 7.12% as of 2026, according to the Tax Foundation. Rates range from 0% in five states with no sales tax (Oregon, Montana, Delaware, New Hampshire, Alaska statewide -- though Alaska allows local taxes) to over 11% in parts of Louisiana, Tennessee, and Arkansas.

How do I find my exact combined sales tax rate?

The most accurate source is your state's department of revenue sales tax lookup tool -- most states provide a free address-based rate finder. For multistate businesses, services like Avalara, TaxJar, or Vertex provide automated rate determination. Using an outdated or incorrect rate triggers audit risk.

Is sales tax the same as VAT?

No. US sales tax is collected only at the point of final retail sale and paid by the consumer. Value Added Tax (VAT), used in the EU, UK, Canada (GST), and Australia (GST), is collected at each stage of production and distribution, with businesses claiming credits for tax paid on purchases. The math is similar for the end consumer but the collection mechanism and business accounting are fundamentally different.

Tax & Payroll

Sales Tax Reverse Calculator

Extract sales tax from a total price or add tax to a pre-tax price using any state or local tax rate.

Sales Tax Calculator

Total Price (Tax Included) ($)

Sales Tax Rate (%)

Results

Enter a price and tax rate, then click calculate.

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Introduction

Sales tax math trips up business owners, bookkeepers, and accountants every day -- not because the concept is hard, but because the common shortcut is wrong. When a customer pays $106.25 for an item, many people calculate the tax by multiplying $106.25 by 6.25%. That produces $6.64 in tax, not $6.25. The correct approach divides the total by 1.0625 to extract the pre-tax price of $100, then subtracts to find the $6.25 in tax. The distinction matters for sales tax remittance accuracy: over-reporting tax means overpaying your state, under-reporting means penalties. According to the Sales Tax Institute, businesses incorrectly calculating sales tax risk audit triggers and back-assessment liability across jurisdictions. This calculator handles both directions -- extracting pre-tax price from a tax-inclusive total (reverse calculation) and adding the correct tax to a pre-tax price (forward calculation) -- for any state, county, or combined rate.

What This Calculator Does

This sales tax reverse calculator performs two functions. In reverse mode, it extracts the original pre-tax price and the exact tax amount from a tax-inclusive total -- the correct method for bookkeeping purposes when only the receipt total is available. In forward mode, it calculates the total price and tax amount from a pre-tax price and a tax rate. Both modes work with any combined sales tax rate including state, county, and city components. The calculator also shows effective tax rate, pre-tax price, and tax amount clearly broken out.

The Formula

Reverse: Pre-Tax Price = Total / (1 + Tax Rate) | Tax Amount = Total - Pre-Tax Price | Forward: Total = Pre-Tax Price x (1 + Tax Rate)

The reverse formula works because the total price equals the pre-tax price multiplied by (1 + tax rate). To find the pre-tax price, divide total by (1 + tax rate expressed as a decimal). Subtracting the pre-tax price from the total gives the exact tax amount. This is mathematically different from multiplying the total by the rate, which produces a higher tax amount because the rate is being applied to the inflated total rather than the original base. The forward formula simply multiplies the base price by (1 + rate) to get the tax-inclusive total.

Step-by-Step Example

Reverse mode: extract tax from a receipt total

Total on receipt: $234.88. Combined sales tax rate (state + county + city): 8.875% (New York City). Pre-tax price: $234.88 / 1.08875 = $215.74. Tax amount: $234.88 - $215.74 = $19.14. Verification: $215.74 x 8.875% = $19.14.

Forward mode: calculate tax on a pre-tax price

Pre-tax price: $450.00. Texas combined rate: 8.25% (6.25% state + 2% local). Tax amount: $450.00 x 0.0825 = $37.13. Total: $487.13.

Mixed-rate scenario for business receipts

A restaurant receipt shows $312.45 total. Rate is 9.0% (California with local component). Pre-tax: $312.45 / 1.09 = $286.65. Food portion tax: $286.65 x 9.0% = $25.80.

Verify a vendor invoice

Vendor invoices $523.60 total on a $480.00 purchase, claiming 9.0% sales tax. Correct tax: $480.00 x 0.09 = $43.20. Correct total: $523.20. Vendor overcharged by $0.40 -- a small amount per invoice that compounds across hundreds of transactions.

Real-World Use Cases

Bookkeeper Separating Tax From Receipts

An accounts payable clerk processes 200 business expense receipts per month where only the total is shown. Using the reverse formula for each receipt produces the correct pre-tax expense and tax amount for the general ledger, ensuring accurate sales tax records and correct expense categorization.

Retail Pricing to Hit a Round Number

A retailer wants a product to ring up at exactly $19.99 all-in at a 7.5% sales tax rate. Working backwards: $19.99 / 1.075 = $18.60 pre-tax price to set in the system. Setting $19.99 as the pre-tax price would ring up at $21.49 total, not $19.99.

Business Expense Reporting for Tax Deductions

A freelancer deducting business purchases needs the pre-tax amount for their Schedule C, since sales tax on deductible items can be deducted separately or lumped with the item cost. The reverse calculator extracts the correct pre-tax amount from each receipt total.

Comparison

State / Location	Combined Rate	Pre-Tax on $100 Total	Tax on $100 Total
Oregon	0.00%	$100.00	$0.00
Colorado (Denver)	8.81%	$91.91	$8.09
Texas (state only)	6.25%	$94.12	$5.88
New York City	8.875%	$91.84	$8.16
California (LA County)	10.25%	$90.70	$9.30
Louisiana (New Orleans)	9.95%	$90.95	$9.05
Tennessee (Nashville)	9.75%	$91.11	$8.89

Common Mistakes to Avoid

Multiplying the total by the tax rate to find the tax amount. This is the most common error. On a $100 total at 10% tax, this method gives $10 -- but the actual tax is $9.09, since the 10% was applied to the $90.91 pre-tax base, not the $100 total.
Using state rate alone when local rates apply. Over 12,000 US jurisdictions have their own sales tax rates layered on top of the state rate. Always use the combined rate for the specific city and county where the sale occurs.
Assuming tax is the same rate for all product categories. Many states exempt groceries, prescription drugs, or clothing from sales tax while taxing other goods at the full rate. Using a single rate across all purchase categories produces errors.
Confusing tax-inclusive and tax-exclusive pricing conventions. In the US, posted retail prices are typically tax-exclusive (tax added at register). In Canada, UK, and Australia, posted prices often include tax. Apply the reverse formula only when the total already includes tax.

Frequently Asked Questions

Accuracy and Disclaimer

Sales tax rates vary by state, county, city, product type, and transaction date. This calculator uses rates you enter and does not verify current jurisdiction rates. Some products and services are subject to reduced rates or exemptions that vary by state. Verify your applicable rate with your state or local tax authority. This calculator is for informational and bookkeeping estimation purposes only.

Conclusion

Accurate sales tax extraction is a basic but often miscalculated bookkeeping task. Use this calculator whenever you need to separate tax from receipts or verify that a tax-inclusive price was calculated correctly. For business expense reporting where you also need to understand the total tax liability across multiple purchase categories, the VAT/GST Calculator handles multi-tier tax structures. The Profit Margin Calculator can then help you factor tax-exclusive costs into accurate pricing.