Total monthly debts are determined by adding the normal and recurring monthly debt payments such as monthly housing costs, car payments, minimum credit card payments, personal loan payments, student loans, child support, alimony, and other things.
By dividing the monthly income into the monthly debt, you arrive at a percentage of the monthly income. Lenders actually look at two different ratios commonly called the front-end and the back-end.
The front-end ratio is the proposed total house payment including principal, interest, taxes, insurance, mortgage insurance if required, and homeowner association fees. Lenders generally don't want these expenses to be more than 28% of the monthly gross income.
The back-end ratio includes the same items that are in the front-end ratio plus any other monthly obligations like the ones mentioned earlier. Lenders prefer to see this ratio not to exceed 36% of monthly gross income but some lenders may extend that to 43%. Borrowers obtaining an FHA mortgage might also be allowed an even higher back-end ratio.
If a borrower had $8,000 monthly gross income, their proposed house payment should not exceed $2,240 or 28% of their monthly gross income. Then, their house payment and monthly debt should ideally not exceed $2,880 or 36% of their monthly gross income.
For the sake of an example, let's say that their monthly debt was $900. That would only leave $1,980 for the maximum house payment. The monthly debt became a limiting factor affecting the house payment.
In addition to determining whether the buyer qualifies for the mortgage, it could affect the interest rate. Having good credit and having the proper ratios can result in being approved for a mortgage. On the other hand, if the debt is on the upper side of an acceptable range, the lender may charge a higher interest rate for the addition risk of a marginal borrower.
While the math is not difficult to come up with your ratios, it is not necessarily a do-it-yourself project. A trusted lending professional can assess your situation and give you an accurate picture of what price home you can afford and the rate you can expect to pay.
Both things are important to know before you start looking at homes and especially before you contract for one. All lenders are not the same. Call me to get a recommendation of a trusted mortgage professional who specializes in the type of mortgage you want. Download this FREE Buyers Guide.