Balloon Payment Loans Explained: How the Lump Sum Is Calculated
How a balloon loan differs from a fully amortizing one, how the final balloon amount is calculated, and the three ways borrowers handle it.
Two terms, not one
A balloon loan has two different clocks:
- The amortization term — the schedule used to compute the monthly payment, often 20 or 30 years.
- The loan term (maturity) — when the loan actually ends, often 5, 7, or 10 years.
The payment is small because it is calculated on the long amortization term. The loan ends before that schedule finishes, so whatever balance remains falls due at once. That remaining balance is the balloon payment.
How the balloon amount is calculated
Two steps:
Step 1 — monthly payment from the amortization term:
M = P x r x (1 + r)^N / ((1 + r)^N - 1)
where P is the loan amount, r is the monthly rate, and N is the number of months in the amortization term.
Step 2 — remaining balance at maturity:
B = P x (1 + r)^n - M x ((1 + r)^n - 1) / r
where n is the number of payments actually made before maturity. B is the balloon.
Worked example: $300,000, 7% rate, 30-year amortization, 7-year term
- Monthly payment on a 30-year schedule: about $1,996
- Payments made in 7 years: 84
- Balance remaining at month 84 — the balloon: roughly $272,000
After seven years and about $168,000 in payments, roughly 91% of the original balance is still outstanding. That is normal, not a mistake: early payments on a 30-year schedule are overwhelmingly interest.
Your three options at maturity
- Pay it in cash. Realistic for short-term bridge or construction financing, rarely for a home.
- Refinance the balance. The most common route — but it depends on your credit, the asset's value, and market rates at that future date, none of which are guaranteed. Model the replacement loan with the refinance calculator.
- Sell the asset. Works only if the sale price after costs exceeds the balloon.
Some notes include a reset or conversion clause that rolls the balance into a new amortizing loan at the then-current rate. Read the note; it is not automatic.
Where balloon loans show up
- Commercial real estate and small-business loans, where a 5- or 10-year term with a 20- or 25-year amortization is standard.
- Seller-financed and land-contract home purchases.
- Some auto and equipment financing, where the balloon is set against a projected residual value.
Since 2014, balloon features on most consumer mortgages are heavily restricted under US ability-to-repay rules, which is why you rarely see them on standard home loans.
The risk in one sentence
A balloon loan trades a lower payment today for refinance risk on a fixed future date — if rates are higher, credit is tighter, or the asset has lost value when the balloon comes due, the exit you planned on may not exist.
Run the numbers
Enter your loan amount, rate, maturity, and amortization term in the balloon payment calculator to see the monthly payment and the exact lump sum due at the end, then compare against a fully amortizing option in the loan comparison calculator.