Which factor does NOT typically affect qualifying ratios for a mortgage?

Qualifying ratios for a mortgage are commonly used to assess a borrower's ability to repay the loan based on their income and current obligations. The primary components that influence these ratios include the borrower’s monthly income, their credit history, and their monthly housing expenses.

Market interest rates, while they can affect the overall cost of borrowing and the affordability of monthly payments, do not directly impact the qualifying ratios themselves. Qualifying ratios are primarily derived from static figures such as income and existing debt levels, independent of the interest rate landscape.

Thus, the correct answer identifies market interest rates as the factor that does not typically affect qualifying ratios. Understanding that qualifying ratios focus on income and debt obligations clarifies their significance in the mortgage approval process, making it clear why interest rates do not factor into these specific calculations.