Data sources
Every rate on this site is copied from a document you can open yourself.
This page lists the publishers behind the calculators. Each calculator also carries its own Sources section naming the exact document its figures came from and the year those figures apply to, which is the list to trust if the two ever disagree.
Currency
Conversions use the euro reference rates the European Central Bank publishes on working days, read through the Frankfurter API.
- Euro foreign exchange reference rates, European Central Bank
- Frankfurter API documentation, Frankfurter
Tax and salary, Canada
Federal and provincial brackets, along with payroll contribution rates and maximums, come from the Canada Revenue Agency.
- Canadian income tax rates for individuals, Canada Revenue Agency
- CPP contribution rates, maximums and exemptions, Canada Revenue Agency
- EI premium rates and maximums, Canada Revenue Agency
Tax and salary, United States
Federal brackets and standard deductions come from the Internal Revenue Service. Social Security and Medicare figures come from the Social Security Administration.
- Federal income tax rates and brackets, Internal Revenue Service
- Contribution and benefit base, Social Security Administration
Loans
Loan tools apply the standard amortisation formula to the figures you enter. There is no rate table behind them, so the only inputs are yours.
How sources are kept honest
Rates live in dated files in the code, one file per country per year, and every row stores the link it was copied from. A script walks those links and reports any that have moved or stopped responding, so a dead reference gets noticed rather than sitting there for a year.
When a new tax year takes effect, the previous year stays in place. Old results stay reproducible, and each page states which year it is showing. If you find a figure that no longer matches its source, tell me on the contact page.
Last updated .