Why is my loan balance barely dropping in the early years?

Because of how amortization works: each payment is split into interest (balance times the monthly rate) and principal (the rest). Early on, the balance is large, so most of your payment goes to interest. For example, on a $200,000 loan at 5%, the first $1,073.64 payment includes $833.33 of interest and only $240.31 of principal. As the balance shrinks, the interest share falls and the principal share grows, so the balance starts dropping faster in the later years.

Do extra payments really save that much interest?

Yes — every extra dollar goes straight to principal, which shrinks the balance faster and reduces the interest charged on every future payment. On a $200,000, 30-year loan at 5%, adding $200 a month cuts the payoff time from 30 years to 21 years and 4 months and saves about $61,160 in interest. Even smaller extra payments make a noticeable difference because interest compounds on the remaining balance.

What is the biweekly payment trick?

Instead of paying once a month, you pay half of your monthly payment every two weeks. There are 26 biweekly periods in a year, so you make 26 half-payments — the equivalent of 13 full monthly payments instead of 12. That is one extra full payment per year, which shortens the loan term and reduces total interest without feeling like a big budget change.

Will my lender charge a prepayment penalty?

Some lenders do, but many do not. A prepayment penalty is a fee charged for paying off a loan early or making extra principal payments. Whether one applies depends on your loan agreement, so check your loan terms or ask your servicer before sending extra payments. If a penalty applies, make sure it is smaller than the interest you would save.

Is this amortization schedule exact?

It is an accurate estimate of a standard amortizing loan, but your actual servicer schedule can differ slightly. Lenders round differently, may apply payments on specific dates, and charge fees (such as escrow, taxes, or insurance on a mortgage) that this calculator does not include. Use this schedule for planning and comparisons, and rely on your lender's official schedule for exact payoff amounts.

Amortization Calculator

Generate the full month-by-month amortization schedule for any loan — see exactly how each payment splits into principal and interest, and how extra payments change the payoff date.

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Annual interest rate (%)

Loan term (years)

Extra payment per month ($)

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Loan start date

Used to date the schedule and payoff. Defaults to this month.

What amortization actually means

Amortization is the process of paying off a loan in fixed installments where each payment covers that month's interest first and the rest reduces principal. Because interest is charged on the shrinking balance, the principal portion of your payment grows every single month — slowly at first, then faster. The schedule below makes this visible: compare month 1 with month 120.

Extra payments don't change your required monthly amount; they go entirely to principal. That lowers the next month's interest charge, which means the following regular payment retires even more principal — a compounding effect in your favor. This is why small, consistent extras beat occasional large ones.

Reading your schedule

The first-12-months table shows the payment-by-payment reality, including the calendar month each payment falls in. After year one, the yearly summary keeps things readable while still showing the balance trajectory. Watch the balance column: the months where it starts falling fast are the months your money is finally working for you instead of the lender.

Frequently Asked Questions

What is an amortization schedule?

A table showing every payment over the life of a loan: how much goes to interest, how much to principal, and the remaining balance after each payment.

Why does the interest portion shrink over time?

Monthly interest equals the monthly rate times the current balance. As payments reduce the balance, the interest charge falls and more of your fixed payment goes to principal.

How much do extra payments really save?

It depends on rate and timing, but on a 30-year loan even $100/month extra can save tens of thousands in interest and cut years off the term. The calculator shows your exact savings versus the no-extra baseline.

Does the schedule assume a fixed rate?

Yes. With an adjustable-rate loan the payment and split would change at each rate reset, so treat this as the picture at today's rate.

What if I make a large lump-sum payment?

Model it approximately by converting it to a monthly extra: lump sum ÷ remaining months gives a rough equivalent, though a true lump sum saves slightly more because it hits principal sooner.

Amortization Calculator

What amortization actually means

Reading your schedule

Frequently Asked Questions

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