Loan & interest software for Windows
Practical Windows software for loan, interest, payoff, and escrow work.
Focused tools. One-time purchases. Free evaluations.
Power of Interest makes focused Windows desktop software for everyday loan work. Amortization Pro loan amortization software for Windows lets you edit payment dates, amounts, rates, and extra principal, then automatically recalculates every later row.
Free trial: 5 unrestricted schedule uses. Register later without reinstalling.
Instant online registration after PayPal purchase. Refund policy · License terms
Just need a quick schedule? Use the free online calculator →
- Edit individual payment rows
- Recalculate all later rows automatically
- Save, reopen, print & export
For private lenders and seller financing
Need to manage the loan after the amortization schedule is created?
Private Loan Manager handles the ongoing work after closing. Keep each loan in one place, post borrower payments, check balances and due dates, and prepare payoff and year-end information without rebuilding the history in a spreadsheet.
- Portfolio dashboard for multiple loans
- Actual payment and balance tracking
- Due dates and installment ledger
- Payoff and year-end reporting
$99 one-time · No subscription · Windows software · Free evaluation
Windows certified payroll software · Free demo
WH-347 Certified Payroll Software for Windows
Prepare weekly WH-347 certified payroll reports for Davis-Bacon construction projects. Import Excel or CSV payroll data, reuse saved project and employee records, review missing details, and generate WH-347 PDFs in one Windows program.
- Import weekly payroll from Excel or CSV
- Generate WH-347 and Statement of Compliance PDFs
- Save projects, workers, and recurring payroll weeks
$199 one-time license · No monthly subscription
Questions
Frequently asked questions
Which Power of Interest software is right for me?
Amortization Pro ($49) creates and edits loan schedules. Private Loan Manager ($99) tracks borrower payments, balances, and multiple loans. WH-347 Certified Payroll Pro ($199) prepares weekly certified payroll reports for construction projects.
Can I try the software before purchasing?
Yes. All three Windows programs offer a free trial or evaluation. Amortization Pro includes five unrestricted schedule uses. Private Loan Manager and WH-347 also offer evaluations so you can explore their features before purchasing.
Is there a monthly subscription or annual renewal fee?
No. Our Windows software is sold with a one-time license purchase. Amortization Pro costs $49, Private Loan Manager costs $99, and WH-347 Certified Payroll Pro costs $199. No monthly subscription is required.
What is the difference between the free online calculators and Amortization Pro?
Our free online calculators are designed for quick calculations. Amortization Pro lets you save loan schedules, change individual payment dates or amounts, automatically recalculate subsequent balances, and print or export reports.
What's the difference between Amortization Pro and Private Loan Manager?
Amortization Pro focuses on creating and modifying loan repayment schedules. Private Loan Manager is designed for ongoing loan administration, including recording actual borrower payments, tracking multiple loans, monitoring balances, and preparing payoff and year-end reports.
Can WH-347 Certified Payroll Pro import Excel or CSV files?
Yes. You can import payroll information from Excel or CSV, maintain project and employee records, and generate WH-347 certified payroll reports and Statements of Compliance in PDF format. Learn more about WH-347 Certified Payroll Pro.
How do I register my software after purchasing?
After purchasing through PayPal, you'll be directed to the software registration process. For Amortization Pro, open Register Software and enter the Installation ID or User ID requested by the registration page to obtain your passcode automatically. Registration is available 24 hours a day.
What if I need technical assistance?
We provide U.S.-based customer support. Call (608) 444-6575 or email support@powerofinterest.com for assistance with installation, registration, or software questions.