Lenders place significant weight on both income and credit score when assessing loan applications. While a credit score reflects past repayment behavior, income represents a borrower’s current ability to service and repay debt.
Lenders lean toward predictable and consistent income because it represents a lower risk of default. This is why lenders often prefer what many borrowers would consider “boring” financial profiles.
Most lenders rely on two key affordability ratios: Gross Debt Service (GDS) and Total Debt Service (TDS).
- GDS represents the percentage of gross income required to cover housing costs such as mortgage or rent, property taxes, and heating.
For example, if monthly housing expenses total $3,500 and gross monthly income is $10,000, the GDS ratio would be 35%.
- TDS measures the percentage of gross income required to cover all debt obligations, including housing costs plus other debts such as car loans, credit cards, and lines of credit.
Using the same example, if additional monthly debt payments total $500, the TDS ratio would be 40%.
Lenders generally set limits for GDS between 32% and 39%, and for TDS between 40% and 44%, depending on loan type, credit profile, collateral, and overall risk.
“But I have excellent credit…” is a common reaction. While a strong credit score demonstrates responsibility and reliability, it does not change whether the provided income is sufficient to service the debt. From a lender’s perspective, approving a loan that cannot be reasonably serviced increases the risk of default or late payments for both the borrower and the institution.
Financial institutions are in the business of lending money and collecting interest. Ideally, they want to approve loans — but only when the balance between risk and reward is reasonable.
In general, lenders prefer continuous and predictable income over cash or savings. I have seen situations where borrowers requested short-term financing for renovations, arguing that they would refinance and repay the loan within a few months. However, lenders typically do not approve applications outside established affordability guidelines. GDS and TDS limits exist to protect borrowers, depositors, and the financial system as a whole.
A strong credit score plays an important role in the lending process, but it is only one part of a broader risk assessment. Income, stability, and affordability ultimately determine whether a loan can be reasonably serviced over time. Understanding this distinction helps explain why some applications are declined despite excellent credit. For a broader explanation of how lenders evaluate applications as a whole, including the role credit scores play within that process, you can read Article 1, Why Strong Credit Scores Still Get Loan Applications Rejected.