It is the other mathematical calculations used by lenders to determine a borrower’s capacity to repay a mortgage. It takes into account the mortgage payments, property taxes, approximate heating costs, and 50% of any maintenance fees, and any other monthly obligations (i.e. personal loans, car payments, lines of credit, credit card debts, other mortgages, etc.), and this sum is then divided by the gross income of the applicants. Ratios up to 44 % are acceptable.