Step 2 of 4 · ProjectsBy jurisdiction

8 open source tax projects for Canada.

Every project on the list for Canada, grouped by kind. Global tools have a page of their own. Entries without a warning come first in each group; the labels mark what to check.

8 projects5 maintained2 on the map4 jurisdictions + globalFacts checked 6 Oct 2026

Browse these by tax area

Income tax Corporate tax Benefits VAT & indirect

Tax engines

3 projects

Rules-as-code that compute liabilities, returns and reforms.

PolicyEngine CanadaModel of Canada's tax and benefit system, built on PolicyEngine Core.Tax engineCA

canataxLightweight Canadian sales and income tax calculator.Tax engineCAInactive since 2025

OpenFisca Canada (DTS)Experiment using OpenFisca as a rules engine for Canadian legislation, a jumping-off point for further work.Tax engineCAInactive since 2021Licence unknown

Calculators

2 projects

Small tools that compute one tax for one country.

canada-hsa-calculatorTypeScript library and CLI for Canadian small-business health spending account tax savings, 2025 brackets.CalculatorCAFor individual taxpayers

retirement_income_tax_planner_CanadaBrowser planner for Canadian retirement income: RRIF, TFSA, CPP, OAS, tax and investment scenarios.CalculatorCAFor individual taxpayersPolyForm Noncommercial 1.0.0

Automations

3 projects

Reusable workflows for provisions, reconciliations and compliance runs.

CFO StackBeancount accounting run through Claude Code, with jurisdiction packs for Canada, the US, Taiwan and China.AutomationCA · US · TW · CNFor individual taxpayers

hts (Analytics Everywhere Lab)Multi-agent AI identifier for Canadian tariff codes from item descriptions, with a local web UI; research.AutomationCALicence unknown

tax-helper (DexterLagan)Racket tool that imports bank CSV files and totals business expenses per category for tax returns.AutomationCAInactive since 2021For individual taxpayers

Labels mark what to check before you rely on an entry: inactive or archived code, demos, paid services and unclear licences. Only maintained projects for companies and tax authorities appear on the map. Search and filter the whole list.

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Next · Step 3 of 4The gapsThe activities with no open project yet, and the partly covered ones, with what to build on.