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What every US mortgage calculator gets wrong

Canadian mortgages compound semi-annually by law (Interest Act, 1985). Every popular US mortgage site — and most generic "Canadian" calculators — uses monthly compounding. On a $600,000 mortgage at 5.49% over 25 years, that's a $22/month error, or over $6,600 paid to the wrong calculation over the amortization. Budget Beavers uses (1 + rate/2)1/6 - 1 for the effective monthly rate. Every time.

US calc says Budget Beavers says
Monthly compounding (r/12) Semi-annual compounding (correct by law)
PMI (Private Mortgage Insurance) CMHC insurance with correct Canadian tiers
30-year fixed rate Term + amortization (distinctly Canadian)
Social Security projections CPP + OAS with age-adjustment + clawback
US federal tax brackets CRA 2025 federal + all 13 provincial brackets

About Budget Beavers

Budget Beavers is a collection of Canadian personal-finance calculators built to get the math right — specifically the math that generic US-centric tools get wrong. Semi-annual mortgage compounding, provincial tax layering (including Ontario's surtax and Quebec's abatement), the OSFI stress test, CMHC insurance tiers, and correct TFSA/RRSP/FHSA contribution rules are all handled accurately.

Every calculator includes a "How is this calculated?" breakdown so you can verify the formula. Tax brackets cite their effective year. Mortgage calculations reference the federal Interest Act. When a regulatory rule changes, the data file is versioned and the change is logged.

Privacy: every calculation runs entirely in your browser. No input data is sent to a server, stored in a database, or shared with third parties. Your financial numbers stay on your device.

Not financial advice. These calculators are educational tools for planning purposes. Consult a qualified financial planner, mortgage broker, or tax professional before making major financial decisions.