How the loan affordability calculator works
Enter the monthly payment you can comfortably afford, the interest rate, and the term. The calculator reverses the standard loan formula to find the maximum principal that payment supports. Instead of asking what a loan costs, you ask what your budget allows.
Worked example: affording $400 a month at 9% APR
If you can afford $400 per month at 9% APR over 60 months, the calculator shows you can support a loan of about $19,269. Stretch the term to 72 months and the affordable amount rises — but so does total interest. This is why testing different terms matters before you commit to a loan.
Affordability traps to watch out for
Affordability is not just the loan payment. Factor in insurance, maintenance, and taxes tied to what you are financing — a car payment that fits can still strain you once fuel and insurance join in. Also leave breathing room: borrowing to your maximum leaves no cushion for surprises. Estimates only, not financial advice.
A simple budget rule for borrowing
A common guideline keeps total debt payments under 36% of gross monthly income, with housing ideally under 28%. Add up your current minimum payments, subtract from your 36% limit, and the remainder is roughly what a new loan payment can be. Enter that number into the calculator to find your realistic loan size.
Frequently asked questions
How much of my income should go to loan payments?
A widely used guideline caps total monthly debt payments at 36% of gross income. Lenders use similar debt-to-income limits when approving loans. Staying comfortably below the cap leaves room for savings and surprises — the calculator helps you translate that payment into an actual loan amount.
Does a longer term mean I can afford a bigger loan?
Yes — the same monthly payment supports a larger loan over more months. But the trade-off is real: you pay far more interest and stay in debt longer. Compare a 60-month and a 72-month version of the same payment in the calculator, then decide whether the extra borrowing is worth the extra cost.
Should I include my partner's income?
Only if you are applying jointly and both incomes will service the debt. If the loan is in your name alone, base affordability on your income only — that keeps the estimate honest about what you personally can repay. Joint applications combine incomes but also combine both credit histories in the lender's decision.
Why does the calculator ask for an interest rate?
Because the same payment buys a different loan size at different rates. A lower rate means more of each payment goes to principal, so you can borrow more. Enter the best rate you realistically expect — check your credit score first, since stronger scores unlock lower rates and bigger affordable amounts.