Preparing Your Credit for a Home Loan

Your credit score is one of the most critical factors in mortgage approval and determines the interest rate you'll receive. The difference between a 620 and a 760 credit score on a 30-year mortgage can translate to tens of thousands of dollars in additional interest paid over the life of the loan. Preparing your credit well before applying can save you significantly.

Conventional loans typically require a minimum credit score of 620–640. CMHC-insured mortgages are available with scores as low as 600. For the best conventional rates, aim for 740 or higher. The higher your score, the lower your rate and monthly payment.

Mortgage preparation should ideally begin 12 months before you plan to apply. This gives you time to dispute errors, pay down balances, establish payment history, and allow any recent negative marks to age. Rushed credit improvement in the weeks before an application is rarely effective and can sometimes backfire.

Get your free reports from both bureaus at Equifax.ca or TransUnion.ca. Mortgage lenders typically pull all three and use the middle score. Any errors — incorrect late payments, wrong balances, accounts that don't belong to you — should be disputed immediately. Give the dispute process 60–90 days to resolve before your planned application.

Reducing credit card utilization is one of the most effective ways to quickly boost your score before a mortgage application. Pay all cards below 10% utilization if possible. Do not close any old accounts — this reduces your available credit and can raise utilization and lower your average account age, both hurting your score.

In the 6–12 months before your mortgage application, avoid opening any new credit accounts. Each application triggers a hard inquiry, and new accounts lower your average account age. New debt also increases your debt-to-income ratio, which lenders evaluate alongside your credit score.

Beyond your credit score, mortgage lenders also evaluate your debt-to-income (DTI) ratio — your total monthly debt payments divided by your gross monthly income. Most conventional lenders prefer a DTI below 43%, with ideal applicants at 36% or lower. Paying down installment loans and credit cards before applying improves both your credit score and your DTI.

Navigating mortgage credit preparation can be complex. A credit advisor can review your specific situation, identify the highest-impact actions, and help you build a timeline that maximizes your score by your target application date. A small improvement in your credit score — even 20–30 points — can unlock significantly better mortgage terms.