What Is a Mortgage Amortization Schedule?
February 28, 2026
Your lender hands you a thick document at closing. Buried inside is a table with 360 rows of numbers. That's your amortization schedule, a payment-by-payment breakdown of where every dollar goes for the next 30 years.
An amortization schedule is a complete table showing each monthly mortgage payment divided into principal and interest, along with the remaining balance after each payment. It's the most detailed view of how your loan gets paid off over time, and it can help you make smarter decisions about extra payments, refinancing, and even whether a 15-year or 30-year term makes more sense.
Table of Contents
- What an Amortization Schedule Shows
- Sample Amortization Schedule
- How the Schedule Changes Over Time
- Using the Schedule to Plan Extra Payments
- How to Get Your Amortization Schedule
- Amortization Schedule for Different Loan Terms
- What the Schedule Means for Refinancing
- Amortization and PMI Removal
- Your Mortgage in 360 Rows
What an Amortization Schedule Shows
Every row in the schedule represents one monthly payment and includes:
- Payment number (1 through 360 for a 30-year loan)
- Payment amount (fixed for a fixed-rate mortgage)
- Principal portion (the part that reduces your loan balance)
- Interest portion (the cost of borrowing for that month)
- Remaining balance (what you still owe after the payment)
Some schedules also show cumulative interest paid and cumulative principal paid, which makes it easy to see the totals at any point in the loan.
Sample Amortization Schedule
Here's what the first year looks like on a $320,000 loan at 6.5% for 30 years (monthly payment of $2,023):
| Month | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
| 1 | $2,023 | $290 | $1,733 | $319,710 |
| 2 | $2,023 | $291 | $1,732 | $319,419 |
| 3 | $2,023 | $293 | $1,730 | $319,126 |
| 4 | $2,023 | $294 | $1,729 | $318,832 |
| 5 | $2,023 | $296 | $1,727 | $318,536 |
| 6 | $2,023 | $298 | $1,725 | $318,238 |
| 7 | $2,023 | $299 | $1,724 | $317,939 |
| 8 | $2,023 | $301 | $1,722 | $317,638 |
| 9 | $2,023 | $302 | $1,721 | $317,336 |
| 10 | $2,023 | $304 | $1,719 | $317,032 |
| 11 | $2,023 | $306 | $1,717 | $316,726 |
| 12 | $2,023 | $307 | $1,716 | $316,419 |
A few things jump out immediately:
Interest dominates early on. In month 1, $1,733 of your $2,023 payment (86%) goes to interest. Only $290 goes toward paying down the loan.
The shift is gradual. From month 1 to month 12, principal increases from $290 to $307. That's only $17 more per month going to principal after an entire year. The shift picks up speed later.
Balance drops slowly at first. After 12 full payments totaling $24,276, your balance has dropped by just $3,581. That means $20,695 (85%) of your first year's payments went to interest.
How the Schedule Changes Over Time
The real story of amortization plays out over years, not months. Here's how the same loan looks at key milestones:
| Year | Monthly Principal | Monthly Interest | Year-End Balance | Total Interest Paid So Far |
|---|---|---|---|---|
| 1 | $290-$307 | $1,716-$1,733 | $316,419 | $20,695 |
| 5 | $345-$368 | $1,655-$1,678 | $299,844 | $101,232 |
| 10 | $425-$458 | $1,565-$1,598 | $272,936 | $194,620 |
| 15 | $533-$582 | $1,441-$1,490 | $236,192 | $277,068 |
| 20 | $688-$760 | $1,263-$1,335 | $186,068 | $344,432 |
| 25 | $905-$1,010 | $1,013-$1,118 | $118,068 | $392,524 |
| 30 | $1,210-$2,012 | $11-$813 | $0 | $408,280 |
The crossover point, where principal exceeds interest in each monthly payment, happens around year 18 or 19. Before that, you're paying more interest than principal every single month.
And that total interest figure is striking: $408,280 over 30 years on a $320,000 loan. You end up paying more in interest than the amount you originally borrowed.
Using the Schedule to Plan Extra Payments
An amortization schedule is your best tool for visualizing the impact of extra payments. When you make an extra payment toward principal, you effectively skip forward in the schedule.
For example, if you make one extra payment of $2,023 directed entirely to principal at the end of year 1, you'd eliminate about 7 future payments from the end of your loan. That's because the $2,023 extra principal payment wipes out the balance that would have otherwise required those final 7 payments (which are mostly principal by that point).
Here's the impact of different extra payment strategies on the same $320,000 loan at 6.5%:
| Strategy | Payoff Time | Total Interest | Interest Saved |
|---|---|---|---|
| No extra payments | 30 years | $408,280 | -- |
| $100/month extra | 26 years, 2 months | $347,900 | $60,380 |
| $200/month extra | 23 years | $298,400 | $109,880 |
| $500/month extra | 18 years, 4 months | $211,800 | $196,480 |
| 1 extra payment/year | 25 years, 6 months | $338,600 | $69,680 |
Even a modest $100 extra per month saves over $60,000 in interest and takes nearly 4 years off the loan. That's the power of compounding in reverse.
Important tip: When making extra payments, always specify that the additional amount should be applied to principal, not to the next month's payment. Your lender's online portal should have this option. If it doesn't, call them. Otherwise, the extra money might just be treated as an early regular payment, which doesn't save you anything.
How to Get Your Amortization Schedule
From your lender. Your lender provides an amortization schedule at closing, and it's usually available through their online portal. If you've made extra payments, the actual schedule will differ from the original.
Online calculators. Many free online calculators generate amortization schedules instantly. Just enter your loan amount, interest rate, and term. Some calculators let you model extra payments too.
Spreadsheets. If you like working with numbers, building an amortization schedule in a spreadsheet is straightforward. The key formula for each row is:
- Interest = Previous Balance x (Annual Rate / 12)
- Principal = Monthly Payment - Interest
- New Balance = Previous Balance - Principal
This is also a great way to model "what if" scenarios, like what happens if you start making extra payments in year 5, or what a refinance to a lower rate would look like.
Amortization Calculator
Amortization Schedule for Different Loan Terms
The schedule looks dramatically different depending on your loan term. Here's a side-by-side comparison of Month 1 on a $320,000 loan:
| 15-Year at 5.75% | 30-Year at 6.5% | |
|---|---|---|
| Monthly payment | $2,660 | $2,023 |
| Month 1 principal | $1,127 | $290 |
| Month 1 interest | $1,533 | $1,733 |
| Principal % of payment | 42% | 14% |
| Total interest over life | $158,800 | $408,280 |
With a 15-year loan, you're putting 42% of each payment toward principal from the very first month, compared to just 14% with a 30-year. The shorter term's higher payment is the price of faster equity building and dramatically less total interest.
What the Schedule Means for Refinancing
Your amortization schedule matters when you're deciding whether to refinance. Here's why:
If you're 10 years into a 30-year mortgage, you've already slogged through the most interest-heavy period. Your payments are now roughly 60% interest and 40% principal. Refinancing into a new 30-year loan resets the clock, putting you back at 85%+ interest in each payment.
That doesn't mean refinancing is always bad. But if the rate savings are modest, a refinance can actually increase the total interest you pay over the remaining life of the loan, even though each monthly payment is lower.
Use the amortization schedule to compare:
- Remaining payments on your current loan (total interest left to pay)
- New schedule after refinancing (total interest on the new loan + closing costs)
If the new total is lower, refinancing makes financial sense. If it's higher, you'd be trading a lower monthly payment for more total cost.
Amortization and PMI Removal
Your amortization schedule tells you exactly when your loan balance will hit 78% of the original purchase price, triggering automatic PMI cancellation. It also shows when you'll reach 80%, when you can request cancellation.
On a $400,000 home with 10% down ($360,000 loan at 6.5%):
- 80% of purchase price = $320,000 balance
- Based on the amortization schedule, this happens around month 98 (about 8 years and 2 months)
- Automatic cancellation at 78% ($312,000) happens around month 113 (about 9 years and 5 months)
If you make extra payments, you'll hit these milestones sooner. Your loan-to-value ratio drops faster, and you can request PMI removal earlier.
Your Mortgage in 360 Rows
An amortization schedule is a roadmap for your mortgage. It shows exactly where every dollar of every payment goes, how your balance decreases over time, and how much total interest you'll pay.
Use it to plan extra payments (even small ones add up to big savings), decide when to request PMI removal, and evaluate whether refinancing genuinely saves you money or just lowers the monthly payment. The schedule doesn't lie. The numbers tell you exactly where you stand and where you're headed.