What an amortization schedule shows you

An amortization schedule is a table that breaks down every monthly mortgage payment into two parts: how much goes toward interest and how much goes toward principal. Your total payment stays the same every month, but the split between these two pieces changes over time. Early in the loan, most of your payment covers interest. By the end, most of it covers principal.

This schedule exists because of how fixed-rate mortgages work. The lender calculates a single payment amount that, if paid on time for the full loan term, will pay off both the interest owed and the borrowed amount. The schedule shows you the math behind that payment and lets you see your loan balance after each payment.

You can request an amortization schedule from your lender, or you can build one yourself using your loan documents and a calculator. Most lenders provide one at closing, and many will email you one if you ask.

Key Takeaways

  • Your fixed monthly payment never changes, but the portion going to interest versus principal shifts with each payment.
  • Early payments are weighted heavily toward interest because you owe interest on the full loan balance.
  • As your balance shrinks, less of each payment goes to interest and more goes to principal.
  • An amortization schedule shows your exact loan balance after each payment, which matters if you refinance or sell.
  • Making extra principal payments early in the loan can shorten the term and save thousands in total interest.

Why your payment splits between interest and principal

Interest is calculated on your remaining loan balance. On day one, you owe the full amount you borrowed, so the interest portion of your first payment is large. As you pay down the principal, the balance shrinks, and the interest owed that month shrinks with it.

The lender sets your monthly payment so that it covers all the interest due that month plus a portion of principal. This means every payment chips away at what you owe. Over 30 years (or 15, or 20), these payments eventually pay off the entire loan.

If you made interest-only payments, your balance would never decrease. If you made random payments with no schedule, you would not know when the loan would be paid off. The amortization schedule guarantees that a fixed payment, made on time, will retire the debt on a specific date.

Reading your amortization schedule

A typical schedule has columns for payment number, payment date, payment amount, principal paid, interest paid, and remaining balance. Here is what each column tells you:

Payment number and date: These track which payment you are making and when it is due. Payment 1 is your first payment after closing.

Payment amount: This is your fixed monthly payment. It never changes (unless you have an adjustable-rate mortgage, which is different). This amount includes principal, interest, and sometimes property taxes and insurance if they are escrowed.

Principal paid: This is how much of your payment reduces the amount you owe. It starts low and increases over time.

Interest paid: This is how much of your payment goes to the lender as interest. It starts high and decreases over time.

Remaining balance: This is what you still owe after that payment. It decreases by the principal amount each month. On the final payment, this balance reaches zero.

How the split changes over a 30-year loan

On a $300,000 loan at 6.5% interest over 30 years, your fixed payment is roughly $1,896 per month. Here is how the split looks at different points:

Payment 1 (Month 1): About $1,625 goes to interest, $271 to principal. Your balance is now $299,729.

Payment 60 (Year 5): About $1,550 goes to interest, $346 to principal. Your balance is now $277,000.

Payment 180 (Year 15): About $1,100 goes to interest, $796 to principal. Your balance is now $150,000.

Payment 360 (Year 30, final payment): About $10 goes to interest, $1,886 to principal. Your balance is now $0.

This shift happens because your balance is shrinking. When you owe $300,000, one month's interest at 6.5% is large. When you owe $150,000, one month's interest is half as much. The payment amount stays fixed, so the extra money that is no longer needed for interest can go toward principal instead.

Why this matters when you refinance or sell

Your amortization schedule shows your exact loan balance at any point in time. If you refinance after 10 years, you need to know what you still owe so you can calculate how much to borrow in the new loan. If you sell your house, you need to know the payoff amount to give to your title company.

The balance on your amortization schedule is not the same as the balance your lender shows online. Your lender's balance includes any interest that has accrued since your last payment and any fees or escrow adjustments. But the amortization schedule gives you the clean number: principal owed after each on-time payment.

If you have made extra principal payments, your actual balance will be lower than the schedule shows. This is good—it means you are ahead of the plan and will pay off the loan early.

How extra principal payments change the schedule

If you pay more than your fixed monthly payment, the extra money goes directly to principal. This shrinks your balance faster and means you owe less interest in future months.

For example, if your payment is $1,896 and you pay $2,000, the extra $104 reduces your principal. Next month, you owe interest on a smaller balance, so less of your regular payment goes to interest and more goes to principal. This compounds: each extra payment makes the next payment slightly more efficient.

Over a 30-year loan, even small extra payments add up. An extra $100 per month can shorten your loan by several years and save tens of thousands in interest. You can use an amortization schedule to see how much interest you would save if you made extra payments, though you will need to recalculate it to account for the new payoff date.

Most lenders allow extra principal payments with no penalty on fixed-rate mortgages. Check your loan documents or ask your lender to confirm there is no prepayment penalty.

Building your own amortization schedule

You need three pieces of information: your loan amount, your interest rate, and your loan term in months. You can find these on your Promissory Note or your Loan Estimate.

Many online calculators will build a schedule for you if you enter these numbers. You can also build one in a spreadsheet using the PMT function to calculate your fixed payment, then use simple formulas to calculate interest and principal for each row.

The math for each month is: interest for that month equals the remaining balance multiplied by the monthly interest rate (annual rate divided by 12). Principal paid equals your fixed payment minus that month's interest. The new balance equals the old balance minus the principal paid.

If you build your own, double-check that your fixed payment matches what your lender told you. If it does not, you have an error in your formula or your numbers.

Frequently Asked Questions

Can I get an amortization schedule from my lender?

Yes. Most lenders provide one at closing. If you did not receive one, contact your loan servicer and ask for an amortization schedule. They can email it to you, usually within a few business days. You can also request one through your online account if your lender offers that option.

Does my amortization schedule change if I make extra payments?

The original schedule does not change, but your actual loan progress will differ from it. If you want to see how extra payments affect your payoff date and total interest, you need a new schedule that accounts for the lower balance. Your lender can provide this, or you can recalculate one yourself.

What if I have an adjustable-rate mortgage?

An amortization schedule for an ARM only shows the fixed-rate period accurately. Once your rate adjusts, your payment changes and a new schedule applies. Your lender will provide a new schedule after each rate adjustment.

Why does my lender's balance not match my amortization schedule?

Your lender's online balance includes accrued interest since your last payment, escrow adjustments, and any fees. The amortization schedule shows the principal balance after an on-time payment, without those additions. Call your lender if the difference is large or you are unsure which number to use.

How much interest will I pay over the life of my loan?

Add up all the interest columns in your amortization schedule. For a $300,000 loan at 6.5% over 30 years, total interest is roughly $383,000—meaning you pay back about $683,000 for a $300,000 loan. This is why even small extra principal payments early on save significant money.