Amortization Calculator
This amortization calculator returns monthly payment amounts as well as displays a schedule, graph, and pie chart breakdown of an amortized loan.
How to Use the Amortization Calculator
Enter the loan amount, annual interest rate, and loan term (years/months). Click Calculate to generate a detailed amortization schedule showing each year's principal paid, interest paid, and remaining balance. Optional: add extra monthly payments to see accelerated payoff and interest savings. Useful for mortgages, auto loans, personal loans, and business loans.
Understanding Amortization
Amortization is the systematic repayment of a loan through regular payments. Each payment covers both interest and principal. Early payments are mostly interest (since balance is high), while later payments mostly reduce principal. An amortization schedule breaks down each payment. Used for mortgages, auto loans, student loans, personal loans. Amortization ensures full loan repayment by the term's end. Longer terms = lower payments but more total interest. Shorter terms = higher payments but less total interest.
Reading an Amortization Schedule
An amortization schedule shows: Month/Year, Payment, Principal, Interest, Remaining Balance. Example month 1 ($300k mortgage at 6%, 30 years): Payment=$1,799, Interest=$1,500, Principal=$299, Balance=$299,701. By year 2, interest drops slightly, principal increases. By year 25, principal dominates. Early extra payments save the most interest. Many lenders provide schedules; calculators generate them instantly. Understanding your schedule helps track payoff progress.
Front-Loaded Interest Problem
Most loan payments are front-loaded with interest. On a $300k mortgage at 6%, the first payment is $1,799: $1,500 interest ($99), $299 principal. You've paid 83% interest for 0.1% principal reduction! Year 15 looks different: more principal, less interest. This front-loading is why extra early payments save enormous sums. Adding $100/month to that mortgage saves ~$64k in total interest and shortens the term by years.
Accelerating Payoff with Extra Payments
Extra principal payments dramatically shorten loan duration and save interest. Example: $300k mortgage, 6%, 30 years (standard = $347k interest). With $100/month extra → saves $64,000 and pays off in ~22 years. With $200/month extra → saves $106,000 and pays off in ~18 years. Make extra payments as lump sums or increase monthly payment. Ensure extra funds go to principal (not just next month's payment). Use calculators to model savings from your planned extra payments.
Bi-Weekly Payment Strategy
Paying bi-weekly (half the monthly payment every 2 weeks) results in 26 payments/year instead of 12 monthly = 13 months of payments annually. On a $300k 30-year mortgage: 13th payment annually accelerates payoff to ~23.5 years, saving ~$92k in interest. Bi-weekly payments work well with semi-monthly income (2 paychecks/month). Check your lender for bi-weekly payment options—many allow them without changing the loan. Most automated lenders support bi-weekly setups.
Refinancing to Lower Rates
If rates drop, refinancing (replacing old loan with new one at lower rate) can save money, though refinancing has closing costs. Example: $300k mortgage, 6% → 4% refinance saves ~$180k over 30 years but costs $3k–6k upfront (appraisal, origination, title). Break-even: ~2–3 years. If staying in home/loan longer, refinance makes sense. Use calculators to compare: New rate + costs vs. remaining loan cost. Refinancing can also shorten term (15-year) for faster payoff.
Business Asset Amortization
In accounting, amortization spreads the cost of intangible assets over their useful life. Assets: patents (20 years), copyrights (varies), trademarks (indefinite, may not amortize), goodwill (varies), software (3–5 years). Example: $100k goodwill amortized over 10 years = $10k annual expense. Reduces taxable income. Depreciation is similar but for tangible assets (equipment, buildings). Both are non-cash expenses reducing tax liability. Consult tax professionals for amortization rules.
Frequently Asked Questions
What is amortization?+
Amortization is the systematic repayment of a loan over time through regular payments. Each payment covers interest and reduces principal. The term also refers to spreading business asset costs over their useful life in accounting.
Why does my first payment mostly go toward interest?+
Early payments are mostly interest because the outstanding balance is high. As you pay down principal, the balance shrinks, so less interest accrues and more of each payment goes toward principal. This is why extra payments early in the loan save significant interest.
How much interest do I actually pay over the loan life?+
Total interest = (Monthly Payment × Number of Payments) − Loan Amount. For a $300k mortgage at 6% over 30 years: ~$647k paid total, ~$347k in interest. Extra payments can reduce this dramatically.
What if I make bi-weekly payments instead of monthly?+
Bi-weekly payments (half the monthly payment every 2 weeks) = 26 payments/year = 13 months of payments. This accelerates payoff and saves interest compared to 12 monthly payments.
Can I use amortization for business assets?+
Yes, amortization spreads the cost of intangible assets (patents, trademarks, goodwill, copyrights) over their useful life for tax purposes. Tangible assets use depreciation. Both reduce taxable income over time.
What is an amortization table used for?+
It helps borrowers see payment breakdown over time, remaining balance, and cumulative interest paid at each period.
Do extra payments always reduce total interest?+
Usually yes, when extra funds are applied directly to principal and no prepayment penalty offsets the savings.
Can adjustable-rate loans use fixed amortization schedules?+
Only partially. Rate changes alter payment math, so fixed schedules become inaccurate after each adjustment.
How do I compare two amortized loan offers?+
Compare monthly payment, total interest, APR, fees, and payoff duration under identical assumptions.
Is shorter amortization always better financially?+
Shorter terms reduce total interest but require higher monthly cash flow. Best choice depends on budget stability and opportunity cost.
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