Borrowing decisions rarely begin with a ratio. They usually begin with a need, a plan, or a moment of pressure. Someone is trying to cover an expense, reorganize their finances, or move forward with a larger decision like a car purchase or a mortgage application. In that moment, the focus tends to land on approval, monthly payments, or interest rates.
Yet lenders often begin somewhere quieter. They look at how much of your income is already committed to debt. In Canada, that relationship between debt and income plays a meaningful role in how borrowing capacity is assessed, especially for larger products like mortgages. When understood early, the debt to income ratio stops feeling like a hidden barrier and starts to feel like a useful lens on financial capacity.