Monthly Payment
Total Interest
Total Amount Paid
Table of Contents
What is an amortization schedule?
An amortization schedule gives you a complete month-by-month view of every payment over the life of your loan. It shows exactly how each payment is split between principal and interest, and your remaining balance after each payment.
How does loan amortization work?
When you take out a fixed-rate loan, the lender calculates a monthly payment that will fully pay off both the principal (the amount you borrowed) and the interest over the agreed term. This process is called amortization.
In the early months of the loan, the bulk of your payment covers interest — because the balance is high and interest is charged on the outstanding balance. As you make payments and the balance falls, less interest accrues each month, so more of your fixed payment goes toward reducing the principal.
By the final payment, almost the entire amount goes to principal, and the balance reaches zero.
Why does most of my early payment go to interest?
Interest is calculated on the remaining loan balance. At the start of a loan, that balance is at its highest, so the interest charge for that month is also at its highest. Since your payment amount is fixed, a larger share goes to interest and a smaller share to principal.
This is why extra principal payments early in the loan are particularly powerful — they reduce the balance faster, which cuts the interest charged on all future payments.
How can I pay off my loan faster?
The most effective way to pay off an amortized loan faster is to make additional payments directly to the principal. Even small extra payments, made consistently, can shave years off a mortgage or auto loan and save thousands in interest.
You can also choose a shorter loan term when taking out a loan. A 15-year mortgage will have higher monthly payments than a 30-year mortgage, but the total interest paid over the life of the loan will be dramatically lower.
What is the amortization formula?
The standard monthly payment formula for an amortized loan is:
M = P × [r(1+r)^n] / [(1+r)^n – 1]
Where:
- M = Monthly payment
- P = Principal (loan amount)
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of monthly payments
For example, a $25,000 loan at 5.5% annual interest over 5 years has a monthly rate of 0.4583% and 60 payments. Applying the formula gives a monthly payment of approximately $478.
What types of loans use amortization?
Amortization applies to most fixed-rate installment loans, including mortgages, auto loans, and personal loans. These are loans where you borrow a fixed amount and repay it in equal monthly instalments over a set term.
It does not apply to revolving credit products like credit cards, or to interest-only loans where you repay no principal during the initial period.
Fixed-rate vs adjustable-rate loans
With a fixed-rate loan, the interest rate remains the same for the entire term, so your monthly payment never changes. The amortization schedule is entirely predictable from day one.
With an adjustable-rate mortgage (ARM), the interest rate can change at defined intervals. This means the payment amount and the amortization schedule can shift when the rate adjusts, making long-term planning more difficult.
FAQs
An amortization schedule is a complete table of periodic loan payments showing the amount of principal and interest that make up each payment until the loan is paid off at the end of its term. Early payments are mostly interest, while later payments consist mainly of principal.
Loan amortization works by spreading payments evenly over the loan term. Each monthly payment covers the interest owed for that month first, with the remainder applied to reduce the principal balance. As the balance falls, the interest portion of each payment shrinks and the principal portion grows.
The monthly payment formula is: M = P × [r(1+r)^n] / [(1+r)^n – 1], where P is the loan principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments. This formula ensures the loan is fully paid off at the end of the term.
In the early months of a loan, your outstanding balance is at its highest, so the interest charged is also at its highest. Since your payment is fixed, most of it covers interest with only a small amount reducing the principal. Over time, as the balance decreases, the interest portion shrinks and the principal portion grows.
Yes. Making extra payments directly to the principal reduces the balance faster, which means less interest accrues each month. Over the life of the loan, even small additional principal payments can significantly reduce the total interest paid and shorten the loan term.
A payment schedule shows the amount and timing of each payment. An amortization schedule goes further by showing the breakdown of each payment into its principal and interest components, along with the remaining balance after each payment.
Amortization applies to fixed-rate installment loans such as mortgages, car loans, and personal loans. It does not apply to revolving credit like credit cards, or to interest-only loans where no principal is repaid during the initial term.