Commercial Loan Calculator guide
Commercial loans often have a shorter maturity than amortization schedule, producing a balloon balance. Underwriting also considers collateral leverage and property cash flow.
Net operating income and lender adjustments—not gross rent—drive DSCR analysis.
How to use the commercial loan calculator
- Enter current amounts: Use current, documented values from the same relevant period.
- Enter assumptions: Use realistic rates, percentages, periods, and costs where applicable.
- Review the full result: Review the primary estimate together with its supporting measures.
- Stress-test risk: Model less favorable timing, value, cost, or rate assumptions.
Formula and variables
The estimate applies the entered values and assumptions to the stated formula.
DSCR = annual net operating income ÷ annual debt service- Inputs — Entered values
- The amounts, percentages, or periods supplied to the calculator.
- Result — Calculated output
- The estimate produced by applying the formula to the entered values.
Worked example: commercial loan calculator
A user enters a representative set of values and assumptions.
- Key inputs
- Amounts, percentages, periods, and costs
- Apply the stated formula.
- Include all relevant entered values and constraints.
- Compare the result with an alternative scenario.
Result: Monthly debt service, maturity balloon, LTV, and DSCR.
Use the estimate as a planning input and verify important decisions with current records or qualified guidance.
Understanding your results
Primary estimate
Monthly debt service, maturity balloon, LTV, and DSCR.
Risk measures
Use supporting payment, leverage, cost, and cash figures together.
Assumptions
- Entered rates and costs remain constant.
- Payments and cash flows occur on schedule.
Limitations
- Taxes, legal terms, accounting treatment, and transaction-specific costs may differ.
- Future values, timing, and rates are uncertain.
Common mistakes
- Reviewing only the headline result.
- Ignoring relevant costs, timing, or supporting measures.
- Using optimistic timing or value assumptions.
- Treating an estimate as a guaranteed outcome.
Practical use cases
Compare scenarios consistently
Change one assumption at a time or enter each alternative using the same basis.
Plan cash requirements
Estimate funds needed before committing.
Planning and decision guide
Stress-test the assumptions
Stress-test vacancy, expenses, rate, and NOI rather than relying on the current operating year.
Review the important risks
A balloon creates refinancing and property-value risk at maturity.
Verify the source values
Review recourse, covenants, reserves, prepayment terms, environmental requirements, and lender NOI adjustments.
Frequently asked questions
What is DSCR?
Annual net operating income divided by annual principal and interest debt service.
Why is there a balloon payment?
The loan term can end before the longer amortization schedule fully repays principal.
What is commercial loan LTV?
Loan amount divided by the lender-accepted property value.
Does this model closing costs?
No. Add appraisal, legal, environmental, lender, title, and reserve costs separately.
Sources and review
- Commercial real estate lending — Federal Deposit Insurance Corporation. Accessed 2026-07-10.
Reviewed 2026-07-10.