Commercial Mortgage Payment & Balloon Sizing Calculator
This commercial mortgage calculator models monthly principal and interest payments, annual debt service burdens, and balloon payoff liabilities at maturity across 20, 25, and 30-year amortization profiles with 5, 7, and 10-year term maturities.
Standard Default Parameters
Underwritten Results Preview
Interactive real-time sliders and calculation engine enabled on live page.
Standard Monthly Amortization Formula
Where monthly payment (M) is sized from principal loan balance (P), periodic monthly interest rate (r = annual rate / 12), and total amortization periods (n = years * 12). Balloon balance is calculated by computing the remaining unamortized loan balance at the end of the specified term.
Formula Components
Anchored Suburban Retail Center
An investor is acquiring an unanchored neighborhood strip center for $5,000,000 and sizing a 70% LTV bank mortgage with a 5-year term and 25-year amortization.
Inputs
Sizing Outcomes
Underwriting Limitations & Disclosures
- Commercial mortgage loans almost always feature shorter balloon maturities (5, 7, or 10 years) than their 20 to 30-year amortization schedules.
- Property taxes, hazard insurance, flood insurance, and replacement capital reserves are not included in baseline principal and interest payments.
- Interest rates may vary depending on swap index movements, lender spreads, and sponsor credit ratings.
- All calculated figures are provided for educational and deal screening purposes. Actual lender term sheets depend on full underwriting review.
Frequently Answered Financing Questions
Verified answers to common borrower and broker inquiries regarding loan sizing, guidelines, and execution.
Why do commercial mortgages have balloon payments instead of 30-year fully amortizing terms?
Commercial banks and institutional lenders limit interest rate and duration risk by capping fixed debt terms at 5 to 10 years, even while structuring payments over a longer 25 or 30-year amortization schedule.
This allows borrowers to enjoy lower, manageable monthly debt service while providing lenders the opportunity to re-underwrite collateral, reassess property condition, and adjust rate spreads upon loan maturity.
Submit Financing Scenario →How do lenders calculate commercial balloon balances at maturity?
Lenders compute remaining principal balances using standard compounding formulas that reflect the initial loan amount minus all cumulative principal portions paid during the term.
Because early payments consist predominantly of interest, a 5-year term on a 25-year schedule pays down approximately 9% to 10% of original principal balance.
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