Quick answer: An amortization schedule shows how each mortgage payment splits between interest and principal over the life of the loan. Early payments are mostly interest; later ones are mostly principal. Use the calculator below, then click "View full amortization schedule" to see the year-by-year breakdown and print it.
Every fixed-rate mortgage payment is the same dollar amount, but what is inside that payment shifts every month. At the start, you are paying mostly interest and barely denting the balance. By the end, almost all of it is principal. The amortization schedule maps that shift exactly.
Understanding it tells you how much equity you actually have, how much interest you have paid, and how much faster extra payments would get you to the finish.
Tip: after entering your loan details, click "View full amortization schedule" beneath the results for the year-by-year table — then use the Print button for a clean PDF.
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| Year | Principal | Interest | Balance |
|---|
What is mortgage amortization?
Amortization is the process of paying off a loan with regular, equal payments over time. Each payment covers the interest due that month first, and whatever is left reduces the principal. Because interest is charged on the remaining balance, the interest portion is largest at the beginning — when the balance is highest — and shrinks every month thereafter.
Why early payments are mostly interest
This surprises most first-time buyers. On a $320,000 loan at 6.85% over 30 years, here is roughly how a single monthly payment splits at different points in the loan:
| Year | Goes to interest | Goes to principal |
|---|---|---|
| Year 1 | ~$1,820 / mo | ~$280 / mo |
| Year 10 | ~$1,500 / mo | ~$600 / mo |
| Year 20 | ~$960 / mo | ~$1,140 / mo |
| Year 29 | ~$130 / mo | ~$1,970 / mo |
The payment never changes, but the balance of interest-to-principal flips completely. This is also why selling or refinancing in the first few years builds little equity — and why extra early payments are so powerful.
How to read your amortization schedule
The schedule generated above shows, for each year: the principal paid, the interest paid, and the remaining balance. Two things worth tracking:
- The crossover point — the year your payment finally tips toward more principal than interest. On a typical 30-year loan at today's rates, that's around year 18–20.
- Total interest — add up the interest column and you'll often find it rivals the original loan amount. Seeing that number is the best motivation to consider a shorter term or extra payments.
Using amortization to your advantage
Once you can see the schedule, you can bend it. Toggle on extra payments and the calculator regenerates the schedule with a second set of columns, showing how much sooner you reach a zero balance. A biweekly payment plan does the same thing automatically by adding one extra payment a year. Even a single annual lump sum visibly pulls the payoff year forward.
How refinancing resets your amortization
Refinancing replaces your existing mortgage with a new one — and a new loan means a brand-new amortization schedule that starts over at the interest-heavy beginning. If you're seven years into a 30-year loan and refinance into another 30-year loan, you reset the clock to year one of amortization, even at a lower rate. That can mean paying more total interest despite the lower monthly payment.
There are two ways to avoid losing ground. First, refinance into a shorter term (for example, a 20- or 15-year loan) so you're not extending your payoff. Second, keep making payments at your old, higher amount after refinancing — the difference goes straight to principal and keeps your amortization on track. Always compare the total interest over the life of the loan, not just the new monthly payment.
Amortizing loans vs. other loan structures
A fixed-rate mortgage is "fully amortizing" — the schedule guarantees the balance reaches zero with the final scheduled payment. Not every loan works this way. Interest-only loans charge only interest for an initial period, so the balance doesn't fall at all until that period ends. Balloon loans amortize as if over 30 years but require a large lump-sum payoff after a few years. Even most auto and personal loans amortize like mortgages, just over shorter terms — which is why the same principal-versus-interest logic applies to our car loan and personal loan calculators.
Frequently asked questions
- CFPB — Loan options and amortization — federal guidance on how mortgage loans amortize over time.
- IRS Publication 936 — Home Mortgage Interest — reference for the deductible-interest portion shown in an amortization schedule.
- HUD — Buying a home — federal homebuyer hub covering loan terms and amortization.
- FRED — 30-Year Fixed Mortgage Average — rate series used for the example schedules.
Last reviewed: June 1, 2026. See our data sources and editorial methodology for how we research every article.