How much house can you buy? Enter your income, the monthly minimum payment on your debts and the amount of cash you can put toward a new home. You'll need to choose an interest rate and estimate your credit rating. We'll calculate the maximum house you can afford, the size of the loan and an estimated payment, making some basic assumptions about taxes, insurance and closing costs. We'll also adjust for your credit history. These are guidelines. Lenders may approve a loan for more, but that doesn't mean the loan is a wise choice.