Add tax to a pre-tax amount
Total = pre-tax amount x (1 + rate / 100)
Example at 8.25%: $100.00 x 1.0825 = $108.25 total.
Tax Data Sources & Methodology
A transparent view of how TaxesLedger structures rates, official source URLs, verification status, formula logic, ZIP lookup confidence, and historical rate-change records.
✓ Source Registry✓ Formula Library✓ Verification Status
TaxesLedger is moving from a calculator-only site into a structured tax data system. Each tax record can carry its rate components, official source URL, confidence label, verification status, historical effective periods, and forward/reverse formulas.
For informational purposes only. Tax rates change frequently — verify with your state's Department of Revenue before filing. This tool is not a substitute for professional tax advice.
· Rate source metadata is tracked in the TaxesLedger tax data registry.
Structured Dataset Coverage
51
US State Records
State and DC baseline records with official authority URLs.
697
City-Level Rates
Local city records used by state and city calculator pages.
5,472
Exact ZIP Matches
ZIP-to-city matches before fallback estimates are used.
13
Canada Records
GST, HST, PST, and QST records for provinces and territories.
30
VAT Countries
Standard VAT rates with country authority links where configured.
Verification Status
| Dataset | Status | Last verified | Notes |
|---|---|---|---|
| Canada GST/HST/PST/QST | Officially verified | July 13, 2026 | Checked against Canada Revenue Agency published GST/HST rate tables. |
| US state and city sales tax | Needs official refresh | Tracked per record | Official state source URLs are attached, but rates should be refreshed state by state before verified-language is used. |
| VAT by country | Imported from internal dataset | Tracked per record | Standard VAT rates are stored with authority links; reduced and exempt rates need country-specific verification. |
Formula Library
Remove tax from a total
Pre-tax amount = tax-inclusive total / (1 + rate / 100)
Example at 8.25%: $108.25 / 1.0825 = $100.00 pre-tax.
Isolate the tax amount
Tax amount = taxable base x (rate / 100)
The same formula works for US sales tax, Canadian GST/HST/PST/QST, and VAT.
Canada Rate Records
| Province or territory | Combined rate | Components | History |
|---|---|---|---|
| Alberta | 5% | Federal GST: 5% | Alberta current Canadian sales tax snapshot. |
| British Columbia | 12% | Federal GST: 5%, British Columbia PST: 7% | British Columbia current Canadian sales tax snapshot. |
| Manitoba | 12% | Federal GST: 5%, Manitoba PST: 7% | Manitoba current Canadian sales tax snapshot. |
| New Brunswick | 15% | New Brunswick HST: 15% | New Brunswick current Canadian sales tax snapshot. |
| Newfoundland and Labrador | 15% | Newfoundland and Labrador HST: 15% | Newfoundland and Labrador current Canadian sales tax snapshot. |
| Nova Scotia | 14% | Nova Scotia HST: 14% | Nova Scotia HST rate after the provincial HST decrease. |
| Northwest Territories | 5% | Federal GST: 5% | Northwest Territories current Canadian sales tax snapshot. |
| Nunavut | 5% | Federal GST: 5% | Nunavut current Canadian sales tax snapshot. |
| Ontario | 13% | Ontario HST: 13% | Ontario current Canadian sales tax snapshot. |
| Prince Edward Island | 15% | Prince Edward Island HST: 15% | Prince Edward Island current Canadian sales tax snapshot. |
| Quebec | 14.975% | Federal GST: 5%, Quebec QST: 9.975% | Quebec GST and QST calculated independently, no longer compounded. |
| Saskatchewan | 11% | Federal GST: 5%, Saskatchewan PST: 6% | Saskatchewan current Canadian sales tax snapshot. |
| Yukon | 5% | Federal GST: 5% | Yukon current Canadian sales tax snapshot. |
Official US Sales Tax Source Registry
These authority links are attached to US state and city records. The next data-refresh step is to verify each stored rate against the corresponding state or local lookup.
Discovery index: Streamlined Sales Tax Governing Board.
Canada and VAT Source Registry
Canada GST/HST/PST/QST
| Jurisdiction | Official source | Level | Rate lookup |
|---|---|---|---|
| Canada | Canada Revenue Agency | federal | Lookup tool |
| Alberta | Alberta Tax and Revenue Administration | province | Source page |
| British Columbia | Government of British Columbia | province | Source page |
| Manitoba | Manitoba Finance | province | Source page |
| Quebec | Revenu Quebec | province | Source page |
| Saskatchewan | Government of Saskatchewan | province | Source page |
VAT sources
EU VAT framework source: European Commission Taxation and Customs Union.
- United Kingdom: 20% standard VAT, source HM Revenue & Customs (HMRC)
- France: 20% standard VAT, source Direction générale des Finances publiques (DGFiP)
- Germany: 19% standard VAT, source Bundeszentralamt für Steuern (BZSt)
- Italy: 22% standard VAT, source Agenzia delle Entrate
- Spain: 21% standard VAT, source Agencia Tributaria (AEAT)