Why is debt ratio calculated on gross amount and not the net amount ? When bank factors in car payment, they are not factoring how much the insurance would be for car going toward det ratio ? should they ? this is a hidden expense with car payment that varies ? credit score 655, B rating. My pay is 2990 gross amount, i live by net amount. -Student loan 333 a mth. because of 30,000 dollars debt. -Rent $350 mth. -Utilities,heat $150 winters mth.. -Cable $30 mth -Groceries 200 mth. my honda accord lx ,car valued at 1700 blue book. worth nothing to banker she said. banker said i could have 15000 car w/ 300 mths paymets for 5yr and a 80000 house at 7% interest, w/ 5% cash back for closing costs ? How are they calculating this to be true ? TDS calculations explanation. Is she setting me up to be house poor in the end by saying go for this car and house on 2990 income to date?