What it means
When you apply for a home loan, the lender wants evidence that you can pay it back without strain. Qualifying ratios turn that question into simple numbers.
They ask what share of your income would go on the new housing payment and what share would go on all your debts together. The first is the front-end ratio, also called the housing ratio.
It divides the monthly housing cost, including loan principal and interest, property taxes, insurance and any association fees, by gross monthly income. The second is the back-end ratio, also called the debt-to-income ratio, which adds other debts such as car loans, student loans and credit card minimum payments.
Traditional benchmarks have been in the region of 28% for the front-end ratio and 36% for the back-end ratio, though lenders and loan programmes set their own limits. Some allow higher ratios for borrowers with strong credit scores, large deposits or substantial savings.
Others are stricter for riskier loans. For a non-specialist, the useful insight is that the ratios work on gross income, before tax, and on minimum payments rather than what you actually spend.
A household can pass the lender's test and still feel stretched if it has other costs, such as childcare or commuting. Treat the lender's ratio as a ceiling, not a target.
You can improve your ratios in three ways: raise income, pay down existing debts, or borrow less. Paying off a small loan can reduce the back-end ratio quickly, which sometimes tips an application into approval.
Lenders also look beyond the two headline ratios. They consider the credit score, the size of the deposit, the stability of employment and the cash left over after closing, sometimes called reserves.
A borrower with strong features in those areas can often be approved at ratios that would be refused for a weaker file.
In practice
Real-world examples.
Example
A couple earning $9,000 a month between them apply for a home loan. The lender calculates that housing would take 27% of their income and all debts 38%, so it asks them to repay a car loan before approval.
Example
A young professional with no other debts has a front-end ratio of 24% and a back-end ratio of 24%. The lender is comfortable and offers a competitive rate.
Example
A mortgage broker explains to a self-employed client that the lender will average two years of income, which lowers the figure used in the ratios. She suggests waiting until a stronger year is added to the average. She also checks that no unreported debts will appear on the credit report, because they would change the back-end ratio.
Formula
Calculation
Front-end ratio = monthly housing cost / gross monthly income
Back-end ratio = (monthly housing cost + other monthly debt payments) / gross monthly income
Suppose a household earns $8,000 a month before tax. The proposed housing cost is $2,000, so the front-end ratio is 2,000 / 8,000 = 25%. Other debts are a car loan of $400, a student loan of $250 and credit card minimums of $150, which total $800. The back-end ratio is (2,000 + 800) / 8,000 = 2,800 / 8,000 = 35%. Against benchmarks of 28% and 36%, both ratios pass.Case study
Seen in the real world.
Brookfield Mortgage Advisers is an illustrative, fictional brokerage whose client, Kiran, earned $6,000 a month and wanted to buy a flat with a monthly payment of $1,900. His front-end ratio was 1,900 / 6,000 = 31.7%, which was above the lender's 28% limit.
The broker looked for ways to reduce the ratio. Kiran increased his deposit by $20,000 from savings, which cut the monthly payment to $1,650, a front-end ratio of 1,650 / 6,000 = 27.5%.
In the illustrative result, the loan was approved. The broker also warned Kiran that passing the test did not mean the payment was comfortable, and encouraged him to build a budget that covered utilities, maintenance and savings before committing. Kiran also showed the lender three months of savings after closing, which the underwriter counted as a reserve and treated as a further sign of strength.
Watch out
Common mistakes.
- Calculating the ratios on take-home pay, when lenders use gross income before tax.
- Forgetting to include property taxes, insurance and association fees in the housing cost.
- Treating the lender's limit as the amount you should borrow, when many households find a lower ratio more comfortable.
Questions
People also ask.
What is a good debt-to-income ratio?
Lenders commonly look for a back-end ratio at or below the mid-30s per cent, though some programmes accept higher figures.
Do qualifying ratios include utilities and groceries?
No, they cover housing costs and reported debt payments, not everyday living expenses.
How can I lower my ratios?
Increase your income, pay off or reduce debts, or choose a cheaper property or a bigger deposit.
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