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Amortization Schedule Generator

Generate a complete month-by-month amortization table for any loan with optional extra payments, a balance chart, and CSV download.

By UtilityKit Team · Reviewed for accuracy by UtilityKit Editors

About Amortization Schedule Generator

An amortization schedule breaks every loan payment into its principal and interest components and shows the remaining balance after each payment. Early payments are dominated by interest; later payments are mostly principal — this calculator makes that shift visible. Enter any loan principal, annual APR, term in months, and an optional start date to generate a dated table covering the full life of the loan. An optional extra monthly payment field shows how even $100 extra per month can shorten a 30-year mortgage by years and save tens of thousands in interest. The full schedule can be toggled open (with sticky headers and scrolling for long loans) and downloaded as a CSV file for spreadsheet import. A balance line chart provides an at-a-glance view of the payoff trajectory.

Why use Amortization Schedule Generator

  • Full dated schedule makes it easy to reconcile against actual loan statements.
  • Extra payment modelling immediately shows interest savings and term reduction.
  • CSV export enables further analysis in Excel, Google Sheets, or accounting software.
  • Sticky-header scrollable table is practical for 360-row mortgage schedules.
  • Runs entirely in the browser — no data uploaded to any server.
  • Replaces opening Excel and writing PMT/IPMT/PPMT formulas from scratch.

How to use Amortization Schedule Generator

  1. Enter the loan principal (amount borrowed).
  2. Set the annual APR and term in months (e.g., 360 for 30 years).
  3. Optionally enter an extra monthly payment to model accelerated payoff.
  4. Choose the start month and year for dated payment entries.
  5. Review the summary card for monthly payment, total interest, and total paid.
  6. Click 'Show full schedule' to view the dated month-by-month table.
  7. Click 'Download CSV' to export the schedule for use in a spreadsheet.

When to use Amortization Schedule Generator

  • Verifying that a lender's amortization table is correct before signing.
  • Planning an extra-payment strategy to pay off a mortgage early.
  • Importing loan data into a personal finance spreadsheet.
  • Understanding how much of each mortgage payment is tax-deductible interest.
  • Comparing the interest cost of different loan terms or APRs.
  • Verifying a lender's amortization schedule before signing closing documents.

Examples

30-year mortgage

Input: $300,000 @ 7% APR, 360 months

Output: Monthly payment: $1,996, Total interest: $418,527, Total paid: $718,527

30-year with $200 extra/month

Input: $300,000 @ 7% APR, 360 months, +$200/mo

Output: Payoff in ~272 months, Total interest: ~$310k (saves ~$108k and 88 months)

5-year auto loan

Input: $30,000 @ 5% APR, 60 months

Output: Monthly payment: $566, Total interest: $3,968

15-year mortgage

Input: $300,000 @ 6.5% APR, 180 months

Output: Monthly payment: $2,613, Total interest: $170,378 (vs $418k for 30y)

Tips

  • Add an extra principal payment of even $50-100/month — the savings compound dramatically over a 30-year mortgage.
  • Make one extra full payment per year (biweekly approximation) to knock 4-6 years off a 30-year loan.
  • Always confirm the lender's actual amortization schedule matches the math — small discrepancies signal incorrect rate or fee setup.
  • Download the CSV and create a separate column to track actual principal payments versus scheduled — useful for refinance decisions.
  • For loans with variable rates (ARM mortgages), regenerate the schedule each time the rate adjusts to track new payoff dates.
  • If you're considering refinancing, generate a new schedule with the new rate and term, then compare total interest to the remaining cost on your current loan plus closing costs.
  • Use the CSV export for tax filing — mortgage interest deduction requires itemizing the interest paid each year.

Frequently Asked Questions

What is an amortization schedule?▾
An amortization schedule is a complete table of periodic loan payments showing the breakdown of each payment into principal and interest, plus the remaining balance after each payment.
Why does early in the loan feel like I'm not making progress?▾
In a standard amortizing loan, the interest portion of each payment equals balance × monthly rate. Early on, the balance is high, so interest consumes most of the payment. As the balance falls, the principal share grows.
How much does an extra $100/month save on a 30-year mortgage?▾
On a $300,000 loan at 7% APR, an extra $100/month saves roughly $47,000 in interest and cuts the term by about 3.5 years. Use this calculator to get the exact figure for your loan.
Can I use this for car loans or personal loans?▾
Yes. Enter the loan amount, APR, and term in months for any amortizing loan — mortgage, auto, personal, or student loan.
What does the CSV include?▾
The CSV contains columns for payment number, date, total payment, principal portion, interest portion, and remaining balance — one row per month.
Does the calculator handle bi-weekly payments?▾
Currently the calculator models monthly payments only. For bi-weekly payment savings, divide your annual extra payment by 12 and enter it in the extra monthly payment field as an approximation.
Why does the balance chart appear to level off at the end?▾
In the early years the balance decreases slowly (high interest share), then accelerates dramatically as the principal share grows. This exponential-looking curve is the amortization effect — the last few years pay off far more principal than the first few.
How does this compare to bankrate.com's amortization calculator?▾
Results match Bankrate to the cent for standard amortizing loans. This tool adds CSV export, dated rows, and an extra-payment column that some commercial calculators charge for or hide behind sign-up.

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How Mortgage Amortization Actually Works (With the Math) Why is most of your early payment going to interest? We work through the amortization formula step by step, build the schedule from scratch, May 2026 · 8 min Debt Snowball vs Debt Avalanche: Which Strategy Pays Off Faster? The avalanche method always wins on math. The snowball method usually wins on follow-through. We weigh both, run the numbers on a $24,500 fo May 2026 · 7 min

Glossary

Amortization
The process of paying off a loan in equal periodic payments where each payment includes both principal and interest.
Principal
The portion of a loan payment that reduces the actual debt balance, as opposed to interest.
Interest
The cost of borrowing money, calculated as the loan balance times the periodic interest rate.
APR (Annual Percentage Rate)
The yearly interest rate on a loan including most fees. Required disclosure under Truth in Lending.
Term
The total length of the loan in months or years. Common terms are 36, 60, 180, 240, 360 months.
Monthly payment
The fixed amount paid each month under standard amortization. Calculated using P × (r(1+r)^n)/((1+r)^n−1).
Balance
The remaining principal owed after each payment. Starts at the original loan amount and ends at zero on the final payment.
Extra payment
Any amount paid above the regular monthly payment, typically applied entirely to principal — accelerating payoff and reducing interest.
Recasting
After making a large lump-sum principal payment, asking the lender to recalculate the payment based on the new balance and original term — keeps the payoff date but lowers monthly payment.