Mortgage lenders typically use the housing expense and debt-to-income ratios to more accurately determine how much you can afford to spend on your mortgage.

• Housing Expense Ratio
  Mortgage lenders recommend that your monthly mortgage payment should be less than or equal to a quarter of your monthly gross income. This percentage can change based on the type of mortgage you choose and sometimes the area in which you’re looking to buy.
• Debt-to-Income Ratio
  You need to factor your other debts into determining an affordable monthly mortgage payment. Mortgage lenders look at whether your total debt is larger than 30-40% of your monthly gross income. Remember, debt is not just credit cards and student loans. It can also include alimony, child support, car loans, and housing expenses.

A mortgage lender, a housing counselor, or consumer credit counselor can help you better understand these guidelines. Before you talk to a financial professional, you can organize your financial picture by creating a budget [PDF 76K ]. Don’t forget that you also have to save for the down payment, closing costs, inspections costs, moving, and other related expenses.