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Tax Rate Sources

Regional calculators use reference rates with visible source links and last-checked dates. Always confirm the official rule for your exact transaction.

Current source list

California Reverse Sales Tax Calculator

Reference rate: 7.25%. Last checked: 2026-05-14.

  • Statewide base sales and use tax: 7.25%

Source: California Department of Tax and Fee Administration

California applies a 7.25% statewide base rate. City, county, and district taxes can make the combined local rate higher.

Texas Reverse Sales Tax Calculator

Reference rate: 6.25%. Last checked: 2026-05-14.

  • Texas state sales and use tax: 6.25%

Source: Texas Comptroller sales and use tax

Texas local taxing jurisdictions can add up to 2%, for a maximum combined rate of 8.25%.

Quebec Reverse Tax Calculator

Reference rate: 14.975%. Last checked: 2026-05-14.

  • Federal GST: 5%
  • Quebec QST: 9.975%QST is calculated on the selling price excluding GST.

Source: Revenu Quebec basic GST/QST rules

Common taxable supplies in Quebec use 5% GST plus 9.975% QST. Some supplies can be exempt or zero-rated.

Ontario HST Reverse Calculator

Reference rate: 13%. Last checked: 2026-05-14.

  • Federal part: 5%
  • Ontario provincial part: 8%

Source: Ontario Ministry of Finance HST rates

Ontario HST is 13%, consisting of a 5% federal part and an 8% provincial part.

UK Reverse VAT Calculator

Reference rate: 20%. Last checked: 2026-05-14.

  • Standard VAT rate: 20%

Source: GOV.UK VAT rates

The UK also has reduced and zero-rated VAT categories. Use the rate that applies to the item or service.

Additional reference sources

These sources are useful for cross-checking rates or finding official agencies. They are not a substitute for the official rule that applies to a specific transaction.