The Amortization Schedule: Where Your Money Really Goes
An amortization schedule is the month-by-month map of your loan — how each payment splits between interest and principal, and how your balance falls over time. Understanding it turns you from a passenger into a driver.
Why early payments are mostly interest
Interest is charged on the balance you still owe, and early in the loan that balance is at its largest. So in the first years, most of each level payment goes to interest and only a little to principal. As the balance falls, the interest portion shrinks and the principal portion grows — the schedule slowly flips. This is not a trick; it is simple arithmetic on a shrinking balance.
The power of extra principal
Because interest is charged on the balance, every extra dollar you put toward principal early removes all the future interest that dollar would have generated. That is why small, consistent extra payments in the early years have an outsized effect — they attack the balance when it is largest.
One painless strategy is to make one extra payment a year — by paying half your mortgage every two weeks, you make 26 half-payments, which equals 13 full payments instead of 12. That single extra payment a year quietly shortens the loan.