Hi, Maria... Here's an easy way to figure it if you want just a ball park figure. Determine how much you want to pay for monthly mortgage payment, then divide that number by .28. The answer will tell you the approximate monthly income you'll need. Of course a lender can give you all the specifics.
Example: If you want a $1,000 mortgage payment, divide by .28. You'll need $3,571 per month or $42,852 of annual income.