How to Read Your Mortgage Amortization Schedule
An amortization schedule is a complete table showing every payment over the life of your loan. For each payment, it shows: the payment date, total payment amount, how much goes to interest, how much goes to principal, and your remaining balance after the payment.
Understanding Front-Loaded Interest
Mortgage amortization is heavily front-loaded — meaning in the early years, the vast majority of each payment goes toward interest, not principal. This is not a trick or a scam; it's simply how compound interest works. You owe the full balance on day one, so the interest charge is highest on day one.
Using This for Tax Purposes
The mortgage interest deduction allows US homeowners to deduct mortgage interest paid from their taxable income (if they itemize). Your amortization schedule shows exactly how much interest you paid in each calendar year. Add up the interest column for any year to get your deductible amount.
How is the monthly payment calculated?
The formula is: M = P[r(1+r)^n] / [(1+r)^n - 1], where P = loan principal, r = monthly interest rate (annual rate ÷ 12), and n = total number of payments. This ensures equal payments that fully pay off the loan by the final month.
What happens to my schedule if I make extra payments?
Extra payments reduce your principal faster, which reduces the interest calculated in subsequent months. Over time this creates a compounding effect that can shave years off your loan. Use our Extra Payments Calculator to see the exact impact.