Source of canpayinsights.ca, a free take-home pay calculator for people who work in Canada: net pay after federal and provincial income tax, CPP/CPP2 (QPP and QPIP in Quebec) and EI, for all 13 provinces and territories, 2026 rates.
It is not a payroll service or a payment processor; it only estimates.
Why the numbers can be trusted
Every build runs the engine against the CRA's published payroll deduction tables (T4032, claim code 1, bi-weekly, 13 jurisdictions) and Revenu Québec's source-deduction table: 10,260 rows. A build that disagrees with them does not deploy.
npm ci
npm run audit:engine # T4032 golden test
npm run prebuild # every pre-build gate
Layout
utils/taxEngine.ts: the calculation enginetests/golden/: fixtures built from the official tables (never edited by hand)scripts/: the audit gatesapp/: Next.js pages, deployed to Cloudflare Workers
Open data
The take-home dataset (455 rows, CSV and JSON, CC BY 4.0) is at canpayinsights.ca/data, mirrored in canpay-open-data.
Contact: info@canpayinsights.ca
