What is an amortization schedule?

An amortization schedule is a complete payment-by-payment table that breaks every installment into its principal and interest components while tracking the remaining loan balance. In the early months, the majority of each payment covers interest because the outstanding balance is still high. As years pass and the balance shrinks, the interest portion decreases and more of each payment goes toward reducing principal. Most lenders provide an amortization schedule at closing, but you can generate one anytime with a calculator like this one to verify charges and plan extra payments.

How does amortization affect taxes?

For homeowners who itemize deductions, the interest portion of each mortgage payment is generally tax-deductible on a primary residence up to $750,000 of mortgage debt (for loans originated after December 15, 2017). Because amortization front-loads interest, you get larger deductions in the early years of the loan. As the loan matures and more of each payment goes to principal, the deductible interest shrinks. Student loan interest is also deductible up to $2,500 per year regardless of whether you itemize. Auto loan and personal loan interest are generally not deductible unless the loan is used for business purposes.

Can I get an amortization schedule for my existing loan?

Yes. Enter your current remaining balance (not the original loan amount), your interest rate, and the number of years left on your loan into this calculator to generate an accurate schedule for the remaining term. You can find your current balance on your most recent monthly statement or by logging into your lender's online portal. If you have been making extra payments, use the actual remaining balance and remaining term to get a schedule that reflects your current situation.

What happens if I make extra payments on an amortized loan?

Extra payments are applied directly to the principal balance, which reduces the amount of interest that accrues in every subsequent month. This creates a compounding savings effect: not only do you save on interest for the current month, but every future payment also has a lower interest component. On a $300,000 30-year mortgage at 6.5%, adding just $200 per month in extra payments saves over $89,000 in interest and pays off the loan roughly 6 years early. Always confirm with your lender that extra payments are applied to principal and not simply held for the next scheduled payment.

What is the difference between annual and monthly amortization?

Monthly amortization divides the loan into 12 payments per year, which is the standard for mortgages, auto loans, and personal loans in the United States. Annual amortization uses one lump-sum payment per year and is more common in commercial lending, some international mortgages, and certain business loans. With monthly payments, you reduce the principal 12 times per year, so slightly less total interest accrues compared to making a single annual payment of the same total amount. The amortization formula is the same in both cases — the only difference is the period length used for the interest rate and number of payments.

How is amortization different from simple interest?

With an amortized loan, each fixed payment covers that period's accrued interest plus a portion of principal, and the interest-to-principal ratio shifts over time as the balance decreases. With a simple interest loan, interest is calculated daily on the outstanding balance but the payment structure may differ — there is no predetermined schedule that guarantees the loan is paid off by a specific date. Most mortgages and auto loans are fully amortized, meaning the balance reaches zero after the final scheduled payment. Simple interest is more common in short-term lending, personal lines of credit, and some auto loans where the exact payoff depends on when payments are received.

Amortization Calculator

Calculate your loan payment, total interest, and view a full amortization schedule with extra payments.

Quick Answer

Amortization is the process of paying off a loan through scheduled equal payments, where each payment covers both interest and principal. The standard amortization formula is P = L[c(1+c)^n] / [(1+c)^n - 1], where L is loan amount, c is monthly rate, and n is total months. Early payments are mostly interest; later payments are mostly principal.

Also searched as: amortization calculator, amortization

Loan Amount ($)

Interest Rate (% p.a.)

Loan Term (years)

Extra Monthly Payment ($)

Monthly Payment

Total Interest

Total Paid

Payoff Date -- Total Payments 0 Interest Saved Time Saved

Amortization Schedule

Month	Payment	Principal	Interest	Extra	Balance

What Is Amortization and How Does It Work?

Amortization is the process of repaying a loan through a series of scheduled, equal payments over a fixed period. Each payment is split between two components: interest, which compensates the lender for the risk of lending, and principal, which reduces the outstanding balance of the loan itself. The word comes from the Latin admortire, meaning "to kill" — you are gradually killing off the debt until it reaches zero.

What makes amortization distinctive is how the ratio between interest and principal shifts over the life of the loan. In the early months, the outstanding balance is at its highest, so the interest charge each month is large and only a small slice of your payment reduces the principal. As years pass and the balance shrinks, less interest accrues each month, which means a larger portion of the same fixed payment is applied to principal. By the final years of the loan, nearly the entire payment goes toward principal.

For example, on a $300,000 mortgage at 6.5% over 30 years, your first monthly payment of $1,896 breaks down as roughly $1,625 in interest and only $271 in principal. By month 180 (the halfway point), the split is approximately $1,018 interest and $878 principal. In the final month, nearly the entire $1,896 goes to principal. This front-loading of interest is why borrowers who sell or refinance early in a loan's life often discover they have built very little equity despite years of payments.

Understanding this dynamic is essential for making informed decisions about mortgage payments, refinancing, and extra payment strategies. The amortization schedule generated by the calculator above shows you exactly how each payment is allocated so you can see where your money goes month by month.

The Amortization Formula

The standard amortization formula calculates the fixed monthly payment needed to fully repay a loan over a given term at a given interest rate:

M = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ − 1]

Where:

M = fixed monthly payment
P = principal (the original loan amount)
r = monthly interest rate (annual rate ÷ 12)
n = total number of monthly payments (term in years × 12)

Worked example: Suppose you take out a $200,000 loan at 6% annual interest for 30 years. The monthly rate is 6% ÷ 12 = 0.5% (0.005), and the total number of payments is 30 × 12 = 360.

(1 + 0.005)³⁶⁰ = 6.02258
Numerator: $200,000 × 0.005 × 6.02258 = $6,022.58
Denominator: 6.02258 − 1 = 5.02258
M = $6,022.58 ÷ 5.02258 = $1,199.10 per month
Total paid over 30 years: $1,199.10 × 360 = $431,676
Total interest: $431,676 − $200,000 = $231,676

Once you know the monthly payment, each row of the amortization schedule is calculated iteratively: the interest portion for a given month equals the remaining balance times the monthly rate, the principal portion equals the payment minus the interest, and the new balance equals the old balance minus the principal portion.

How to Read an Amortization Schedule

An amortization schedule is a table with one row per payment period that tracks how your loan balance decreases over time. Each row typically includes five columns: the payment number, the total payment amount, the principal portion, the interest portion, and the remaining balance after that payment. Some schedules also show cumulative interest paid to date.

The table below shows the first five months of a $200,000 loan at 6% for 30 years. Notice how the interest decreases slightly each month while the principal increases — this is the amortization effect in action.

Payment #	Payment	Principal	Interest	Balance
1	$1,199.10	$199.10	$1,000.00	$199,800.90
2	$1,199.10	$200.10	$999.00	$199,600.80
3	$1,199.10	$201.10	$998.00	$199,399.70
4	$1,199.10	$202.10	$997.00	$199,197.60
5	$1,199.10	$203.11	$995.99	$198,994.49

By examining the schedule, you can see that after five payments totaling $5,995.50, only $1,005.41 has gone toward principal while $4,989.99 has gone to interest. This is typical for the early stage of a long-term loan. The schedule generated by the calculator above follows the same format but extends to every payment through the end of your loan.

Key Amortization Terms

Understanding these terms will help you navigate loan documents and make better borrowing decisions:

Principal: The original amount borrowed, or the remaining unpaid balance at any point during the loan. Principal decreases with each payment.
Interest: The cost of borrowing, expressed as an annual percentage rate (APR). Your lender calculates monthly interest by multiplying the outstanding principal by the monthly rate (annual rate ÷ 12).
Amortization period: The total time over which the loan is scheduled to be repaid. Common periods are 15 and 30 years for mortgages, 3 to 7 years for auto loans, and 2 to 7 years for personal loans.
Balloon payment: A large lump-sum payment due at the end of a loan that is not fully amortized. Some commercial loans amortize payments over 30 years but require a balloon payment after 5 or 10 years.
Negative amortization: Occurs when your monthly payment is less than the interest due, causing the unpaid interest to be added to the principal. The loan balance actually grows instead of shrinking. This can happen with certain adjustable-rate mortgages or payment-option ARMs.
Prepayment penalty: A fee charged by some lenders if you pay off the loan early or make extra payments above a certain threshold. Always check your loan agreement for prepayment terms before making additional payments.
Escrow: An account managed by your mortgage servicer that holds funds for property taxes and homeowners insurance. Your total monthly payment may include an escrow portion on top of the principal and interest shown in the amortization schedule.

Amortization: Annual vs Monthly Payments

Most consumer loans in the United States use monthly amortization, but some commercial and international loans use annual payments. The choice affects the total interest you pay because more frequent payments reduce the principal sooner.

Feature	Monthly Payments	Annual Payments
Payment frequency	12 times per year	Once per year
Principal reduction	Every month	Once per year
Total interest (same loan)	Slightly lower	Slightly higher
Cash flow impact	Smaller, regular payments	One large payment
Common use	Mortgages, auto, personal loans	Commercial, international loans

Types of Amortized Loans

Amortization applies to most installment loans, but the terms, rates, and structures vary widely by loan type. Here is a comparison of the most common amortized loans:

Loan Type	Typical Term	Typical Rate	Payment	Collateral
Mortgage	15-30 years	5.5%-7.5%	Monthly	Property
Auto Loan	3-7 years	4%-9%	Monthly	Vehicle
Personal Loan	2-7 years	6%-24%	Monthly	None (unsecured)
Student Loan	10-25 years	4%-8%	Monthly	None (unsecured)

The amortization calculator above works for all of these loan types. Simply enter the loan amount, interest rate, and term to generate a schedule. For mortgage-specific features like property taxes and insurance, see our dedicated mortgage calculator.

Practical Examples

Here are three real-world scenarios to illustrate how amortization works across different loan types and amounts:

Scenario 1: $300,000 Mortgage at 6.5% for 30 Years

Monthly payment: $1,896.20
Total of 360 payments: $682,632
Total interest paid: $382,632 (127.5% of the original loan)
After 10 years (120 payments), remaining balance: $258,242 — only $41,758 of principal paid
With $200/month extra payment: saves $89,060 in interest, pays off in 24 years instead of 30

Scenario 2: $25,000 Auto Loan at 5.9% for 5 Years

Monthly payment: $483.15
Total of 60 payments: $28,989
Total interest paid: $3,989 (15.96% of the original loan)
Month 1 breakdown: $360.25 principal, $122.92 interest
With $100/month extra payment: saves $669 in interest, pays off in 3 years 8 months

For more detailed auto loan analysis, use our car loan calculator.

Scenario 3: $15,000 Personal Loan at 10% for 3 Years

Monthly payment: $484.01
Total of 36 payments: $17,424
Total interest paid: $2,424 (16.16% of the original loan)
Month 1 breakdown: $359.01 principal, $125.00 interest
Shorter terms mean faster principal paydown and less total interest

Compare different personal loan scenarios or explore how compound interest works in the context of investments versus debt.

How to Pay Off Your Loan Faster

If you want to reduce the total interest you pay and become debt-free sooner, consider these proven strategies:

Make biweekly payments: Instead of paying once a month, pay half your monthly amount every two weeks. Because there are 52 weeks in a year, you end up making 26 half-payments — the equivalent of 13 full monthly payments instead of 12. On a $300,000 mortgage at 6.5%, this alone can shave roughly 4 years off a 30-year term and save over $60,000 in interest.
Round up your payment: If your payment is $1,896, round it up to $1,900 or $2,000. The extra few dollars each month go entirely to principal and add up substantially over the life of the loan.
Make one extra payment per year: Use your tax refund, bonus, or holiday savings to make a 13th payment each year. This has a similar effect to biweekly payments and can cut years off your loan.
Refinance to a shorter term: If rates drop or your credit improves, refinancing from a 30-year to a 15-year mortgage can dramatically reduce total interest — though your monthly payment will be higher. Use our loan calculator to compare scenarios.
Request a mortgage recast: If you receive a windfall (inheritance, sale of another property), you can make a large lump-sum payment toward principal and ask your lender to recast the loan. Recasting keeps your current interest rate and term but recalculates a lower monthly payment based on the reduced balance.
Apply windfalls to principal: Tax refunds, work bonuses, and cash gifts can be directed toward your loan principal. Even irregular extra payments make a meaningful difference because they reduce the balance on which future interest is calculated.

Use the extra payment field in the calculator above to model any of these strategies and see exactly how much interest you would save. For a broader debt repayment plan, try our debt payoff calculator.

Amortization vs Simple Interest Loans

Amortized loans and simple interest loans both charge interest on the outstanding balance, but they differ in structure and predictability. With a fully amortized loan, every payment is the same fixed amount, and the loan is guaranteed to be paid off by the end of the term. The lender provides a complete schedule at origination showing exactly how much principal and interest each payment covers.

Simple interest loans, by contrast, calculate interest daily based on the current balance. Your payment amount may vary, and the payoff date depends on when you make payments. If you pay early in the billing cycle, less interest accrues; if you pay late, more interest accrues. Simple interest is common in short-term personal loans, some auto loans, and lines of credit.

The key advantage of amortization is predictability: you know exactly what you owe each month, exactly how much goes to interest versus principal, and exactly when the loan will be paid off. This makes budgeting straightforward and allows you to plan extra payment strategies with precision.

Disclaimer: This calculator is for informational purposes only and does not constitute financial, tax, or legal advice. Results are estimates based on the inputs you provide and assume a fixed interest rate with no fees, taxes, or insurance included. Actual loan terms, payments, and total interest may differ based on your lender's specific calculations, fees, and rounding methods. Always consult a qualified financial professional or your lender for decisions specific to your situation.