About

Ontario mortgage intelligence, built for real buyers.

ClearKey is a free Ontario mortgage calculator built for homebuyers who want to understand their numbers before they make an offer. We believe that buying a home is one of the most significant financial decisions a person can make — and that everyone deserves access to the same quality of information that mortgage professionals use every day.

"Most mortgage calculators tell you a number. ClearKey tells you why — and what to do about it."

What We Built

ClearKey gives Ontario homebuyers 10 free mortgage tools in one place — from stress testing a target home price to planning a down payment across every account type to calculating a break penalty before refinancing.

Every calculator is built around how Canadian lenders actually qualify borrowers — Canadian semi-annual compounding, OSFI stress test rules, CMHC premium tiers, and Ontario-specific closing costs including the Toronto Municipal Land Transfer Tax.

What Would It Take?

Stress test any home price across 5%, 10%, and 20% down scenarios with income and debt requirements.

Rate Tracker

Live Bank of Canada overnight rate, prime rate, next announcement date, and current lender rates.

Down Payment Planner

Project FHSA, RRSP, TFSA, and GIC savings growth with full closing cost breakdown.

Income Qualifier

Calculate qualifying income for salaried, self-employed, seasonal, commission, and RRIF income types.

GDS / TDS Qualifier

Live ratio bars with a ranked action plan to fix offside ratios before applying.

CMHC & LTV

Insurance premium calculator with the updated $1.5M insured limit and property type rules.

Amortization

Full year-by-year breakdown with prepayment analysis and mortgage-free date.

Rent vs Buy

Break-even analysis factoring in appreciation, opportunity cost, and Ontario land transfer tax.

New to Canada

Mortgage rules by immigration status — PR, work permit, and study permit qualification explained.

Penalty Calculator

IRD vs 3-month interest for Big 6 and monoline lenders with refinance break-even analysis.

The AI Mortgage Assistant

Every tab on ClearKey includes an AI mortgage assistant powered by Claude, built by Anthropic. You can ask it anything about your specific numbers — from how lenders calculate self-employed income to whether breaking your mortgage to refinance makes financial sense.

The AI assistant is trained on Canadian mortgage rules, OSFI stress test guidelines, and Ontario market context. It gives straight answers in plain language, 24 hours a day, without an appointment.

The AI assistant provides general educational information only and does not constitute mortgage advice. Always consult a licensed mortgage professional before making financial decisions.

Who We Are

ClearKey is operated by a privately held Ontario corporation. The tool was built by a team passionate about financial transparency and the belief that homebuyers should have access to the same analytical tools as the professionals they work with.

ClearKey is entirely self-funded and supported by advertising. We do not charge for access, collect personal information, or store your calculator inputs. Every calculation happens in your browser.

We are not a licensed mortgage brokerage and do not provide financial or mortgage advice. ClearKey is an educational tool only.

Our Commitment to Accuracy

All calculations on ClearKey are built around current Canadian mortgage regulations and guidelines including OSFI B-20, CMHC insured mortgage rules (updated December 2024), and standard lender qualification practices.

We update our rate data, benchmark prices, and calculation rules regularly. However, mortgage rules and market conditions change — always verify your results with a licensed mortgage professional before making any financial decisions.

If you spot an error or have a suggestion, we want to hear from you at hello@clearkey.ca.

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