A common guideline for debt-to-income ratios is 33/38. A borrower's housing costs consume thirty-three percent of their monthly income. Add their monthly consumer debt to the housing costs, and it should take no more than thirty-eight percent of their monthly income to meet those obligations.
The guidelines are just guidelines and they are flexible. If you make a small down payment, the guidelines are more rigid. If you have marginal credit, the guidelines are more rigid. If you make a larger down payment or have sterling credit, the guidelines are less rigid. The guidelines also vary according to loan program. FHA guidelines state that a 29/41 qualifying ratio is acceptable. VA guidelines do not have a front ratio at all, but the guideline for the back ratio is 41.
Example: If you make $5000 a month, with 33/38 qualifying ratio guidelines, your maximum monthly housing cost should be around $1650. Including your consumer debt, your monthly housing and credit expenditures should be around $1900 as a maximum.