1
Make changes without starting over
Edit individual payment dates, amounts, rates, extra principal, or notes directly in the schedule.
Amortization Pro for Windows · Try it free · $49 one-time
Amortization Software That Keeps Up With Real Loan Changes. Edit Any Payment. Recalculate the Rest Automatically.
Stop rebuilding schedules when a loan changes. Edit a payment date, amount, interest rate, or extra principal payment and Amortization Pro recalculates every later row for you. Save the loan, reopen it when needed, and print clean schedules and reports.
Free trial: 5 unrestricted schedule uses. Register later without reinstalling.
Instant online registration after PayPal purchase — no waiting for email. Secure PayPal checkout for the full version · Refund policy · License terms
- ✓Edit individual payment rows
- ✓Recalculate all later rows automatically
- ✓Save, reopen, print & export
Just need a quick schedule? Use the free online calculator →
Why Amortization Pro is different
Make the change once. Let the schedule do the rest.
When payments, dates, or rates change, you should not have to rebuild a spreadsheet. Amortization Pro is designed for loans that need to be adjusted, reviewed, saved, and documented over time.
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See the impact immediately
Recalculate every later row automatically so you can see the updated balance, interest, and payoff timing.
3
Keep each loan ready for later
Save complete loan files and reopen them when a borrower pays extra, terms change, or you need a new report.
4
Turn the schedule into a useful report
Print clear schedules, annual totals, and reports instead of handing someone a rough spreadsheet.
How registration works
After purchase, PayPal returns you to our registration page. Registration is automatic—no email and no waiting.
- 1Pay with PayPalComplete secure checkout.
- 2Return to Power of InterestPayPal brings you back to our software registration page.
- 3Enter your software IDOpen Register Software and enter the Installation ID or User ID requested on the page.
- 4Register immediatelyThe page verifies your purchase and provides the one-time passcode automatically.
Available 24/7. Register any time, day or night—there is no need to wait for an email or for support to respond.
Since 1999Loan and interest software
One-time purchase optionsNo forced monthly subscription
Free evaluationsTry Windows software before buying
U.S.-based support(608) 444-6575 · support@powerofinterest.com
Choose the right version
Choose the version that fits what you need.
Use the free online calculator for quick schedules, test the Windows program with the free evaluation, or register Amortization Pro to edit, save, reopen, and print your loans.
Free Schedule Calculator
$0 runs in your browser
- Build complete amortization schedules
- Review totals, charts, and annual summaries
- Print the schedule and report
- Individual payment rows remain view-only
Windows Evaluation
$0 five unrestricted uses
- Install and evaluate the desktop software
- Use full loan amounts for five schedule uses
- After five uses, principal is fixed at $60,000
- Register later without reinstalling
Amortization Pro
$49 per license
- Edit payment dates, amounts, rates, and notes
- Recalculate all later rows automatically
- Save and retrieve loan schedules
- Print annual totals and complete reports
- Use any loan principal amount
- Choose 1 license for $49 or 4 licenses for $196
See the software
Loan terms, totals, and charts in one clear workspace.
Enter the loan once
Set the principal, rate, dates, payment frequency, and calculation method, then build the full schedule.
Review the complete picture
See total interest, total paid, payoff date, remaining balance, and annual interest-versus-principal charts.
A real amortization example
See what one extra principal payment changes.
This example uses a $250,000, 30-year loan at 6.50% with a regular monthly principal-and-interest payment of $1,580.17. A $10,000 principal payment is entered after payment 12.
No extra payment
- Monthly payment
- $1,580.17
- Total interest
- $318,861.22
- Scheduled payoff
- 360 months
- Balance after payment 12
- $247,205.69
$10,000 extra after month 12
- Monthly payment
- $1,580.17
- Total interest
- $269,588.24
- Estimated payoff
- 323 months
- Balance after payment 12
- $237,205.69
Difference in this example
$49,272.98less interest37 monthsearlier payoffIllustrative principal-and-interest calculation only. Actual lender posting methods, fees, rounding, dates, and loan terms may change the result.
Questions
Frequently asked questions
What does Amortization Pro cost?
Amortization Pro is $49 per license. A 4-license pack is $196. Each purchase is a one-time charge with no subscription or recurring fee.
What is different about the free online version?
The free version builds and prints schedules, but individual payment-row dates, payment amounts, rates, and notes are view-only.
What is the downloaded evaluation?
It is the Windows desktop software. It allows five unrestricted schedule uses. After that, the principal is fixed at $60,000 until registration. Compare the free calculator, evaluation, and Amortization Pro schedule software.
How is the software registered?
After purchasing through PayPal, PayPal returns you to the Power of Interest registration page. Open Register Software in Amortization Pro and enter the Installation ID or User ID requested on the page. The page verifies the purchase and provides the one-time passcode automatically. No email or waiting is required; registration is available any time, day or night.
How do I get help?
Need help? Call (608) 444-6575 or email support@powerofinterest.com.
Try Amortization Pro free
See how much easier an editable loan schedule can be.
Use the Windows trial for 5 unrestricted schedule uses. Change payment dates, payment amounts, interest rates, or extra principal and see every later row recalculate automatically—before you spend anything.
✓ 5 unrestricted schedules
✓ No subscription
✓ Register later without reinstalling
Download Free Trial
Windows software · $49 one-time if you keep it