Roughly speaking, you may need to earn $130,000 per year if you want a $400,000 home. Here’s the breakdown: A $400,000 mortgage with a fixed interest rate of 7.5% would give you a monthly mortgage payment of $2,797. To keep your front-end ratio (your housing costs compared to gross monthly income) below 25%, which many lenders prefer, you’d need to earn $11,188 per month, or $134,256 per year. Some lenders may approve you for a loan that size with a lower income, however, so it’s worth it to make your loan application as strong as possible.