Amortization Schedule Calculator

How to Read This Schedule

Each row shows how much of that period's payments went toward paying down the actual loan balance, principal, versus how much was the lender's interest charge. Early in a loan, a much larger share of each payment goes to interest; that balance gradually shifts toward principal as the loan matures, and this table makes that shift visible, period by period, rather than leaving it as an abstract idea.

The remaining balance column tracks exactly how much is still owed after each period's payment, useful for checking payoff progress at any specific point during the loan, not just at the very end.

Why This Matters for Extra Payments

Because interest is calculated on the remaining balance, making extra principal payments early in a loan, when the balance and therefore the interest portion is highest, saves substantially more total interest than making the same extra payment later in the loan's life. A ₹50,000 extra payment made in year 2 eliminates years of future interest on that ₹50,000 that would otherwise have accrued; the same ₹50,000 paid in year 14 only avoids interest for the loan's final, much shorter remaining stretch.

A Worked Example

At the default numbers, a ₹20,00,000 loan at 8.5% over 15 years produces a monthly payment of roughly ₹19,695. Looking at year 1 of the schedule: only about ₹68,984 of that year's total payments actually reduces the principal, while roughly ₹1,67,354 is interest, meaning interest makes up about 71% of the first year's payments. Compare that to year 15, the final year: roughly ₹2,25,806 goes toward principal versus only about ₹10,531 in interest, a near-complete reversal, with principal now making up about 96% of the payments.

Total Interest Over the Life of a Loan

Summed across all 15 years, total interest on this ₹20,00,000 loan comes to roughly ₹15,45,062, more than 77% of the original loan amount. This is a common and often surprising realization for borrowers: over a long enough tenure, total interest paid can approach, or even exceed, the amount actually borrowed. Shortening the tenure, even by a few years, or making extra principal payments early, both reduce this total meaningfully, which this table makes concrete rather than abstract.

The Crossover Point: When Principal Overtakes Interest

Somewhere in the middle of a loan's term, the monthly split between principal and interest crosses over, the point where principal paid in a given period starts exceeding interest paid, having been the reverse for all the earlier periods. For this 15-year loan, that crossover happens somewhere around the midpoint of the term, though the exact year shifts earlier for higher-rate loans, since more interest accrues each period and delays crossover, and later for lower-rate loans. Scrolling through the yearly view and watching where the principal column overtakes the interest column is a concrete way to see this shift for any specific loan's numbers.

Using This Table to Plan Prepayments Strategically

Because the early years of a loan carry the highest interest burden, this schedule is useful for deciding when extra payments would have the most impact. Checking the interest column for the next few years shows roughly how much interest is being paid at the current stage of the loan; the higher that figure, the more a prepayment now would save compared to the same prepayment made several years later, once the interest portion has already declined naturally through the normal amortization process.

Fixed vs Adjustable Payments Within an Amortization Schedule

This calculator assumes a fixed interest rate and fixed payment amount for the entire loan term, which is how most standard home, auto, and personal loans work. Some loans, particularly certain mortgages, use an adjustable rate that changes periodically, which would mean the payment amount and the entire schedule shift at each rate adjustment date rather than staying constant throughout. If working with an adjustable-rate loan, treat this calculator's schedule as accurate only up to the first rate adjustment, and regenerate it with updated numbers once a new rate takes effect to see the revised schedule going forward.

How This Schedule Changes If You Refinance Midway

Refinancing effectively replaces the remaining schedule with a brand new one, starting from the current outstanding balance at a new rate and potentially a new term. To model a refinance using this calculator, find the remaining balance at the point of refinancing from the original schedule, then run a fresh calculation using that balance as the new loan amount along with the new rate and term being considered. Comparing the total interest remaining on the original schedule against the total interest on the new, refinanced schedule shows whether the refinance actually saves money once the new terms are factored in, not just whether the new rate is numerically lower.

Using Amortization Data for Tax Purposes

In some tax systems, the interest portion of loan payments, particularly for home loans, is eligible for a tax deduction, while the principal portion generally is not, or is treated differently. This schedule's separate principal and interest columns make it straightforward to identify exactly how much interest was paid in a given year for this purpose, though the specific rules for what qualifies and any deduction limits vary by country and by loan type, so it's worth confirming the applicable rules with a tax advisor or a lender's official interest certificate rather than relying solely on this calculator's estimate for actual tax filing.

Comparing Two Loan Offers Using Their Schedules

Beyond just comparing headline interest rates, generating a full amortization schedule for two competing loan offers side by side reveals differences that a single summary number can obscure, like how quickly each loan builds equity in the early years, or how the total interest compares at a specific point if either loan might be paid off early or refinanced before its full term. A loan with a slightly higher rate but shorter term can sometimes show a favorable principal-building pace in its early years compared to a lower-rate, longer-term alternative, a nuance that's easy to miss when comparing only the monthly payment or interest rate in isolation.

Yearly vs Monthly View: When to Use Each

The yearly view condenses a long loan into an easily scannable summary, useful for understanding the overall shape of a loan's interest-versus-principal split over its full term without scrolling through hundreds of individual rows. The monthly view is more useful for shorter-term loans, or for checking the exact balance or payment breakdown at a specific point in time, like confirming what the remaining balance will be after a particular month before making a decision about prepayment or refinancing.

Why Amortization Feels Slow at First

Many borrowers are surprised, or even discouraged, looking at their loan balance after a year or two of payments and seeing it's dropped far less than the total amount paid would suggest. This schedule makes the reason concrete: in the early years, most of each payment is interest, not principal, so the balance genuinely does shrink slowly at first despite steady, on-time payments. This isn't a sign anything is wrong; it's simply how reducing-balance amortization works. The pace of balance reduction accelerates naturally later in the term, exactly as this table shows, once the interest portion has shrunk and more of each payment reaches the principal.

A Note on Balloon Payments and Interest-Only Periods

Not every loan fully amortizes to zero using a standard schedule like the one this calculator generates. Some loans include an interest-only period at the start, where payments cover only accruing interest and the balance doesn't reduce at all until regular amortization begins later, or end with a balloon payment, a large lump sum due at the end of the term that's significantly bigger than the regular payments before it. If working with a loan structured this way, this calculator's standard amortization schedule won't match it exactly; treat it as a baseline comparison for a conventional, fully amortizing loan rather than a precise match for these less common structures.

What Happens to the Schedule If a Payment Is Skipped

This calculator assumes every scheduled payment is made on time and in full. In reality, a skipped or partial payment doesn't erase what's owed; the unpaid amount, along with the interest that continues to accrue on the outstanding balance, typically gets added to what's due, which extends the effective schedule beyond what this calculator shows, and depending on the lender, may also trigger late fees or penalty interest. If a payment is missed, generating a fresh schedule with the updated actual balance, once known, gives a more accurate picture of the revised path to payoff than assuming the original schedule still applies.

Reading This Alongside Official Loan Documentation

While this calculator's math closely follows the standard formula banks use, a lender's official amortization schedule, usually included with a loan agreement or available through an online banking portal, remains the authoritative source for an actual loan. Small differences can arise from exact disbursement dates, how a partial first month is handled, or specific rounding conventions a lender applies. Use this calculator freely for planning, comparing scenarios, and understanding the general shape of a loan's amortization, but confirm exact figures against official statements when making decisions that depend on precision, like calculating exact prepayment savings or preparing tax documentation.

Frequently Asked Questions

Why does the monthly view take a moment to load for long loans?

A 20-year loan has 240 individual monthly rows to calculate and render, it's still nearly instant, but yearly view is easier to scan for long-term loans, while monthly view is more useful for shorter-term loans or checking a specific month.

Does this match my bank's exact schedule?

This uses standard amortization math and should closely match most fixed-rate loans, but exact figures can differ slightly due to day-count conventions, fees, or rounding methods specific to your lender.

Why does the interest portion decrease every single period, even without any extra payments?

Because interest is calculated on the remaining balance, and the standard scheduled payment reduces that balance every period, the interest portion mechanically shrinks a little each time, even with no extra payments, purely from the reducing-balance calculation.

Does making one extra payment change the entire rest of the schedule?

Yes, in reality, an extra payment reduces the balance that all future interest is calculated on, which would shift every subsequent row's numbers. This calculator shows the standard schedule without extra payments; recalculating with a lower starting balance approximates the effect of a one-time extra payment.

Why is the remaining balance not exactly zero at the end?

Small rounding differences can leave a tiny non-zero balance at the very end of a long schedule. This is a normal artifact of rounding to the nearest currency unit across many periods, not an error in the calculation.

Can I use this for a loan that already has some payments made?

Enter the current outstanding balance as the loan amount, along with the current interest rate and remaining term, to generate a schedule starting from today rather than from the original loan date.