Debt-to-Income Ratio Calculator
Your debt-to-income ratio is one of the most important numbers lenders use to assess mortgage or loan applications. Calculate yours and see what it means.
Debt-to-Income Ratio Guide
What DTI Means to Lenders
DTI equals total monthly debt payments divided by gross monthly income times 100. Most UK mortgage lenders want your total debt payments (including the new mortgage) to represent no more than 35–45% of gross income. Some lenders use a stricter 28% threshold for housing costs alone (the front-end ratio). A DTI above 43% is a common hard limit for conventional mortgages.
DTI Benchmarks
Under 28%: excellent — strong borrowing position. 28–36%: good — well within most lenders' criteria. 36–43%: acceptable — you may qualify but with fewer lender options. 43–50%: concerning — many mainstream lenders will decline; specialist lenders may consider you at higher rates. Over 50%: high risk — significant debt reduction recommended before applying for major credit.
How to Improve Your DTI
The fastest improvement is paying down existing debt, particularly high-minimum-payment debts like credit cards. Increasing income through overtime or a second income helps. Avoiding new debt commitments for 3–6 months before a mortgage application is critical. Consolidating multiple high-payment loans into a single lower-payment loan can help the ratio but requires careful analysis of total interest cost.
DTI vs Credit Score
DTI and credit score are separate metrics. A high credit score with high DTI can still lead to rejection — lenders care more about your ability to make payments than your historical track record. The reverse is also true: a modest credit score with low DTI often leads to approval. Focus on both metrics in the run-up to a significant credit application.
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