Canatax is a dependency-free Python package for estimating Canadian income and sales taxes. Built for developers who need quick tax calculations for applications, prototyping, or general estimation purposes.
This software provides tax estimates only and is not professional accounting software. I am not a licensed accountant or tax professional. While the calculations are based on current CRA guidelines and provincial tax rates, this tool should not be used as your sole source for tax planning, filing, or financial decisions.
For official tax advice, consult a qualified accountant or use CRA-approved software.
Income Tax Estimation:
- Federal and provincial/territorial income tax
- CPP/QPP contributions (province-specific)
- Employment Insurance (EI) premiums
- Quebec Parental Insurance Plan (QPIP) for Quebec residents
- Basic Personal Amount (BPA) calculations with high-income phase-outs
- Uses 2025 tax rates and brackets
Sales Tax Calculation:
- GST, PST, HST, and QST calculations
- Automatic tax selection based on province/territory
- Structured breakdown of all applicable taxes
Zero Dependencies: Pure Python with no external requirements.
pip install canataxfrom canatax import IncomeTaxCalculator
# Calculate tax estimate for $80,000 income in British Columbia
estimate = IncomeTaxCalculator.calculate(income=80000, province="BC")
print(f"Province: {estimate.province}")
print(f"Federal Tax: ${estimate.federal_tax:,.2f}")
print(f"Provincial Tax: ${estimate.provincial_tax:,.2f}")
print(f"CPP: ${estimate.cpp:,.2f}")
print(f"EI: ${estimate.ei:,.2f}")
print(f"Total Tax: ${estimate.total_tax:,.2f}")
print(f"Net Income: ${estimate.net_income:,.2f}")from canatax import SalesTaxCalculator
# Calculate sales tax for $100 purchase in Quebec
estimate = SalesTaxCalculator.calculate(amount=100.00, province="QC")
print(f"Province: {estimate.province}")
print(f"GST: ${estimate.gst:,.2f}")
print(f"QST: ${estimate.qst:,.2f}")
print(f"Total Tax: ${estimate.tax_total:,.2f}")
print(f"After Tax: ${estimate.after_tax:,.2f}")IncomeTaxCalculator.calculate(income: float, province: str) -> IncomeTaxEstimate
Calculates income tax estimate for the given income and province.
Parameters:
income: Annual gross income (float)province: Two-letter province code (e.g., "ON", "BC", "QC")
Returns: IncomeTaxEstimate object with calculated taxes and deductions.
SalesTaxCalculator.calculate(amount: float, province: str) -> SalesTaxEstimate
Calculates applicable sales taxes for a purchase amount.
Parameters:
amount: Purchase amount before tax (float)province: Two-letter province code
Returns: SalesTaxEstimate object with tax breakdown.
All Canadian provinces and territories are supported:
- AB, BC, MB, NB, NL, NT, NS, NU, ON, PE, QC, SK, YT
- E-commerce applications: Calculate tax estimates for shopping carts
- Payroll prototyping: Rough estimation of payroll deductions
- Financial planning tools: Provide ballpark tax calculations
- Educational purposes: Demonstrate Canadian tax system mechanics
- Budget calculators: Help users estimate take-home pay
Tax calculations are based on:
- Current CRA federal tax brackets and rates
- Provincial/territorial tax rates and basic personal amounts (BPAs)
- 2025 CPP, EI, and other contribution limits
- Published GST/PST/HST rates by province
Limitations:
- Does not account for tax credits beyond basic personal amounts
- Does not include deductions for RRSP, childcare, etc.
- Simplified calculation model suitable for estimation purposes
- May not reflect mid-year rate changes or special circumstances
Bug reports, feature requests, and contributions are welcome! This project helps developers build better financial tools for Canadians.
MIT License – Free for personal and commercial use.
If this tool has been helpful for your projects, consider buying me a coffee. No promises that I'll spend the money responsibly.