Early payoff penalties: Some mortgage companies charge a fee if you pay off your current mortgage in full. Check to see if your Home Loan carries a prepayment penalty before obtaining a mortgage refinance–this could change the calculation. Remaining balance or interest costs: Find out your final loan pay-off amount before proceeding with a mortgage refinance. This is typically not the amount shown on your latest bill, since the final pay-off may include some additional interest charges or other fees.