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Power of Interest software store

Loan & Amortization Software for Windows

Choose the program that matches the job. Try the Windows evaluation first, then use the secure PayPal checkout when you are ready. No required monthly subscription.

Choose by job

Not sure which program fits your workflow?

These short buyer guides start with the job you are trying to do, then point to the matching Windows software.

Editable amortization schedulesWhen you need to save, edit, recalculate, and print a loan schedule.Private loan servicingTrack actual payments, balances, due dates, and reports.Seller financingMove from the closing schedule into ongoing payment tracking.Irregular-payment payoffRebuild the payment history before calculating payoff.Daily interest & payoffCreate repeatable payoff worksheets instead of one-time estimates.

See the software before you buy.

Amortization Pro is shown here with loan setup, payment totals, payoff date, balance and annual charts, and the editable amortization schedule.

Actual software screenshot
Actual Amortization Pro Windows software screen
Amortization Pro: click the screenshot to inspect the interface full size before purchasing.

Not sure which program to choose?

Which Windows loan program do I need?

Start with the task you are trying to complete. You can download a free evaluation before purchasing any program.

If you need to…Use this programPrice
Create or edit a complete amortization scheduleAmortization Pro
Extra payments, changing rates, balloon balances, annual totals, charts, saving and printing.Best for: building and editing complete loan schedules.		$49
Calculate daily interest, per diem, and a payoffDaily Interest & Payoff Calculator Pro
Save calculations, print a one-page payoff worksheet, and save the worksheet as a PDF.Best for: per-diem and payoff worksheets you can save or print.		$25
Track payments on private or seller-financed loansPrivate Loan Manager
Post actual payments, track balances, due dates, payoff amounts, and year-end totals.Best for: servicing ongoing private and seller-financed loans.		$99
See how extra mortgage payments change payoffMortgage Payoff Calculator
See time saved, interest saved, target payoff dates, and monthly schedules.Best for: homeowner extra-payment and early-payoff planning.		$25
Create dated payment coupons for a borrowerLoan Payment Coupon Book Pro
Generate and print 1 to 480 payment coupons in flexible page layouts.Best for: printable dated borrower payment books.		$25
Prepare RESPA escrow analysis and disclosuresRESPA Escrow Analysis Pro
Initial and annual disclosures plus 12-month aggregate escrow analysis.Best for: escrow analysis and borrower disclosure preparation.		$25
Reconstruct irregular payments and calculate a payoffLoan Reconciliation & Payoff Pro
Late, partial, principal-only and irregular transactions using daily simple interest.Best for: rebuilding irregular payment histories and payoff balances.		$50

All prices are one-time purchases. No required monthly subscription.

Software store

Compare, try, then pay securely with PayPal.

Each product includes a free-evaluation link and product details. Amortization Pro now uses server-verified PayPal checkout so the sale can be recorded and registration can open automatically after payment.

What happens after you buy?

1Pay securely with PayPalComplete your purchase through PayPal.
2Payment is verified automaticallyPower of Interest verifies the completed PayPal payment and records the sale before registration opens.
3Enter your software IDOpen Register Software in your program and enter the Installation ID or User ID requested on the registration page.
4Register immediatelyThe Power of Interest registration page provides the one-time passcode automatically. No second PayPal login, no email request, and no waiting.

Windows desktop software

Amortization Pro

$49one-time purchase

Create editable amortization schedules with extra principal, changing rates, balloon balances, annual totals, charts, printing, saving, and retrieval.

  • Build detailed loan schedules
  • Edit dates, payments, rates, and notes
  • Save, retrieve, print, chart, and export
Buy with PayPal — $49Buy 4 Licenses with PayPal — $196Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Windows daily-interest & payoff software

Daily Interest & Payoff Calculator Pro

$25one-time purchase

Calculate daily interest / per diem, accrued interest, and total payoff, then save the calculation and create a professional one-page payoff worksheet.

  • Actual/365, Actual/360, and Actual/366
  • Save and reopen borrower payoff calculations
  • Print Preview, Print, and Save As PDF
Buy with PayPal — $25Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Windows desktop software

Private Loan Manager

$99one-time purchase

Manage private and seller-financed loans after origination. Record payments, track principal and interest, see balances, monitor due dates, and prepare year-end totals.

  • Multiple-loan portfolio and current balances
  • Payment allocation between principal and interest
  • Balance-as-of-date, payoff, and year-end reports
Buy with PayPal — $99Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Consumer Windows mortgage software

Mortgage Payoff Calculator

$25one-time purchase

See how extra monthly or one-time mortgage payments can shorten the payoff and reduce interest without the complexity of professional amortization software.

  • Payoff month, time saved, and interest saved
  • Target payoff month and payment needed
  • Editable monthly Extra amounts, monthly schedule, and annual totals
Buy with PayPal — $25Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Windows desktop software

Loan Payment Coupon Book Pro

$25one-time purchase

Create professional dated loan payment coupon books for private loans, seller financing, mortgages, and installment loans.

  • Generate 1 to 480 monthly coupons
  • Choose 3, 4, or 6 coupons per page
  • Save files and print selected coupon ranges
Buy with PayPal — $25Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Windows desktop software

RESPA Escrow Analysis Pro

$25one-time purchase

Prepare initial and annual escrow disclosures and perform a 12-month aggregate escrow analysis on your Windows computer.

  • Initial escrow disclosure statements
  • Annual escrow disclosure statements
  • 12-month aggregate trial balance
Buy with PayPal — $25Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Windows desktop software

Loan Reconciliation & Payoff Pro

$50one-time purchase

Reconstruct irregular loan histories transaction by transaction and calculate a payoff through a selected date.

  • Irregular, late, partial, and principal-only payments
  • Actual/365 or Actual/360 daily simple interest
  • Reconciliation report and payoff statement
Buy with PayPal — $50Product DetailsFree Evaluation

Instant online registration after PayPal purchase — no waiting for email. One-time purchase · No subscription · Secure payment through PayPal · Free evaluation available · Refund policy · License terms

Since 1999Loan and interest software
Try firstFree Windows evaluations
One-time pricingNo forced monthly subscription
U.S. support(608) 444-6575

Pay by mail

Prefer to pay by check?

Make a check payable to ERICH INCORPORATED. Include the product name, your full name, phone number, and email address.

ERICH INCORPORATED
5747 Pembroke Drive
Fitchburg, Wisconsin 53711

For questions before mailing payment, call (608) 444-6575 or email support@powerofinterest.com.

Before you order

Purchase questions

Can I evaluate the software before buying?

Yes. Each program has a Windows evaluation available from its product page or download link.

Is this a subscription?

No. The products shown here use one-time purchase pricing.

How is registration handled?

For Amortization Pro, Power of Interest verifies the completed PayPal payment, records the sale, and opens a secure registration page automatically. Enter the Installation ID shown by the program and the one-time passcode is generated immediately. No second PayPal login or manual email request is required.

Before you continue

Review an amortization example.

See how the software handles extra principal payments, balloon balances, changing interest rates, and biweekly schedules. Or browse all amortization guides.