Checkout estimator
Add a verified combined rate to a pre-tax price.
Select Add, enter the amount and current authority rate, then inspect tax and total.
Can reproduce the cent-rounded total without assuming the tool looked up the rate.
Sales Tax Calculator
Add an entered sales-tax rate to a pre-tax amount or extract tax from an inclusive total using cent-rounded forward and reverse arithmetic.
Built for Finance Extended1 documented formula2 recommended next stepsPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Add-or-extract mode, pre-tax amount or tax-inclusive total as labeled, and a current combined rate supplied by the user
Output to expect
Cent-rounded pre-tax amount, sales-tax amount, tax-inclusive total, entered rate, and calculation mode
How it works
Forward multiplication in Add mode and division by 1 + rate in Extract mode, with currency outputs rounded to cents and reconciled
- The tool does not look up rates or decide taxability; verify the correct jurisdiction, sourcing/destination, product, date, exemptions, holidays, and special districts.
- Tax-authority and point-of-sale rounding rules can differ; use official current guidance before charging, reporting, or filing tax.
Choose your path
Built around the job you need to finish
Add or extract an entered sales-tax rate with cent-rounded arithmetic while leaving rate lookup, sourcing, and taxability to current official authority.
Receipt reconciler
Extract the pre-tax and tax portions from an inclusive total.
Select Extract, enter the paid total and rate, and confirm the three amounts reconcile to cents.
Gets a real reverse calculation rather than a forward-only page claim.
Seller or filer
Avoid using generic arithmetic as a taxability or filing decision.
Verify jurisdiction, product, sourcing, date, exemption, district, and rounding rules with the tax authority.
Does not charge or file tax solely from a typed rate and calculator output.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- Sales tax ratesNew York State Department of Taxation and Finance · Official rate lookup, jurisdiction boundaries, and current local-rate routing.
- Sales tax rates, additional sales taxes, and feesNew York State Department of Taxation and Finance · Combined-rate computation, taxable receipt multiplication, and cent rounding.
- Know Your Sales and Use Tax RateCalifornia Department of Tax and Fee Administration · Address-based official rate lookup and district-tax context.
- State TablesStreamlined Sales Tax Governing Board · State-specific tax-administration links and cross-state sourcing resources.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Forward Sales Tax Calculation
In Add mode, multiply the entered pre-tax amount by the entered rate, round tax to cents, and add it to the cent-rounded amount.
Sales Tax = Net Price × Sales Tax Rate; Total Price = Net Price + Sales TaxReverse Sales Tax (Extraction)
In Extract mode, divide the entered tax-inclusive total by one plus the entered rate, round the pre-tax amount to cents, then reconcile tax as total minus pre-tax amount.
Pre-Tax Price = Gross Price ÷ (1 + Sales Tax Rate)Authority Boundary
The user supplies a current combined rate after checking the relevant tax authority. The calculator does not assume that state, county, city, and district components are always simply additive or applicable.
Entered Rate = Current Authority-Sourced Rate for the TransactionUpdated: August 2026
Example Scenarios
Use a current jurisdiction/product/date-specific rate obtained from the applicable tax authority.
Purchase Amount: $1,200Sales Tax Rate: 9.5%
→ Sales tax: $114; Total price: $1,314
Model a verified zero-rate transaction without treating zero as a universal state or product conclusion.
Purchase Amount: $1,500Sales Tax Rate: 0.0%
→ Sales tax: $0; Total price: $1,500
Select Extract for a $537.50 tax-inclusive total and an entered 7.5% current rate.
Gross Total: $537.50Sales Tax Rate: 7.5%
→ Pre-tax base price: $500; Sales tax portion: $37.50
FAQ
No. Obtain the current rate from the relevant state or local tax authority for the transaction's location, sourcing rule, product, and date.
Reverse division can create fractions of a cent. This model rounds the pre-tax amount to cents and defines tax as the tax-inclusive total minus that rounded amount. Official or point-of-sale rounding rules can differ.
No. Product and service taxability, exemptions, holidays, use tax, marketplace rules, and special fees are jurisdiction-specific and require current official guidance.
About Sales Tax Calculator
Choose whether the entered amount is pre-tax or already tax-inclusive. The tool performs only the selected arithmetic and rounds currency to cents. It does not look up a rate or determine jurisdiction, sourcing, product taxability, exemptions, holidays, or filing treatment.