How to Calculate a Loan's Monthly Payment in Excel With Tax & PMI. Your monthly loan payment consists of more than just equity and interest payments. If you didn't put down at least 20 percent ...

Link monthly payment calculations to the PMT function and autofill the cells across the schedule. Calculate interest for each period by multiplying the ending balance by the period rate.

You can calculate your mortgage payment using a formula or a spreadsheet, but it's probably easier to use a mortgage calculator.