A balloon loan is a loan that does not fully pay itself off over its life. Instead, you make relatively small monthly payments for a few years, and then one very large lump sum — the "balloon" — is due on a set date. This calculator shows you both sides of that bargain: the low monthly payment you will actually write each month, and the giant balance you will need to refinance, sell, or pay off when the balloon comes due.
The math is the same one lenders use. The monthly payment is sized as if the loan were amortized over a much longer period (often 30 years), but the loan actually ends after a short term (often 5 to 7 years). What is left unpaid on that final day is the balloon.
How to Use
- Enter the Loan Amount — the original principal you are borrowing. This is the starting balance before any interest accrues.
- Set the Interest Rate (APR). Balloon loans sometimes carry a lower rate than a fully-amortized loan because the lender is only locked in for a few years, but always confirm the actual rate you were quoted.
- Choose the Balloon Term — the number of years until the lump sum is due. Common choices are 5, 7, or 10 years. After that many monthly payments, the remaining balance must be paid in full.
- Pick the Amortization Schedule — the longer horizon used only to calculate the monthly payment. A 30-year amortization on a 7-year balloon is the classic setup, but you can test a 15- or 20-year schedule to raise the monthly payment and shrink the balloon.
The result card then shows your Monthly Payment, the Balloon Balance due at the end of the term, how many monthly payments you will make, and the total dollars — principal plus interest — you will have paid by the due date.
The Balloon Loan Formula
The monthly payment uses the standard amortization formula used by Fannie Mae, Freddie Mac, and major US lenders:
M = P × r(1 + r)ⁿ / ((1 + r)ⁿ − 1)
Where:
- M is the monthly payment.
- P is the original loan amount.
- r is the monthly interest rate — the annual APR divided by 12.
- n is the number of payments in the amortization schedule (the long one, e.g. 360 for 30 years).
The balloon balance is the future value of the remaining debt after you have made k actual monthly payments (k = balloon term in years × 12):
B = P × (1 + r)ᵏ − M × ((1 + r)ᵏ − 1) / r
Worked example on a $200,000 loan at 6.00% with a 7-year balloon and a 30-year amortization: the monthly rate is 0.005, n = 360, and k = 84. The monthly payment works out to $1,199.10, but after 84 months the remaining balance — the balloon you owe — is still $179,278.77. You have paid roughly $100,724 over those seven years, but only about $20,721 of that actually reduced principal; the rest, about $80,003, went to interest. That is the defining tradeoff of a balloon loan: low monthly bills in exchange for a huge balance later.
If the rate is 0%, the PMT formula divides by zero, so the engine simply splits the principal evenly across n months, and the balloon is whatever principal has not yet been paid down.
Why Would Anyone Choose a Balloon Loan?
Balloon loans are not for everyone, but they make sense in a few specific situations:
- Short-term holders. If you know you will sell the home or car within 5–7 years, a balloon loan lets you afford a larger purchase today with lower payments, because you never intended to carry the debt to term.
- Bridge financing. Builders, flippers, and small-business owners use balloon loans to cover a gap between buying and selling, or between receiving revenue and needing permanent financing.
- Expecting a windfall. If a large payout, bonus, or refinancing opportunity is expected by the due date, the low monthly cost preserves cash flow in the meantime.
- Self-employed borrowers. Income that is uneven now but expected to rise can justify deferring principal repayment.
The risk is obvious: if you have not sold, refinanced, or saved the balloon by the due date, you may be forced into a rushed, expensive refinance or lose the asset. Always have an exit plan before you sign.
How Does a Balloon Loan Compare to a Fully-Amortized Loan?
Take the same $200,000 at 6.00%:
- 30-year fixed, fully amortizing: payment is about $1,199/month, and after 7 years you still owe roughly $179,279 — exactly the balloon balance. The difference is that on a normal 30-year loan you could keep paying that $1,199 for another 23 years and be done. On a balloon loan, you cannot. At month 84 the lender demands the entire $179,278 tomorrow.
- 7-year interest-only: payment is $1,000/month, but the balloon is the full $200,000 — you paid nothing down.
- 7/30 balloon (this calculator's default): payment is $1,199.10, and the balloon is $179,278.77.
In other words, a 7/30 balloon is exactly the first seven years of a normal 30-year mortgage, except the clock stops and the rest is due immediately.
Examples
Example 1 — The classic 7/30 mortgage. A buyer borrows $200,000 at 6.00%, with the balance due after 7 years but payments amortized over 30 years. The monthly payment is $1,199.10. At the end of year seven, the balloon balance is $179,278.77. They plan to refinance or sell before that date.
Example 2 — A larger commercial loan. A small business takes a $1,000,000 balloon loan at 6.50%, with a 7-year due date and payments spread over 30 years. The monthly payment is $6,320.68, and the balloon balance at month 84 is $904,162.45. The low payment preserves operating cash flow, but the company must refinance or sell enough assets to cover nearly a million dollars at the due date.
Example 3 — Shortening the balloon. On the same $200,000 at 6.00%, if you choose a 15-year amortization instead of 30 years, the monthly payment jumps to about $1,687.71, but the balloon balance at year 7 falls to roughly $130,800. Choosing a shorter amortization is the fastest way to shrink the lump sum you will owe later.
FAQ
What is a balloon loan?
A balloon loan is a loan that has a short term (typically 5–7 years) but monthly payments calculated as if it were amortized over a much longer period (often 30 years). Because the payment is based on the longer schedule, it is low, but at the end of the short term the entire remaining balance — a large "balloon" — is due all at once.
How is the monthly payment on a balloon loan calculated?
The monthly payment uses the standard amortization formula M = P × r(1+r)ⁿ / ((1+r)ⁿ − 1), where n is the number of months in the long amortization schedule (for example 360 for 30 years), not the short balloon term. The interest rate r is the annual APR divided by 12.
How is the balloon balance calculated?
The balloon balance is the remaining principal after k = balloonTermYears × 12 payments. It is computed as B = P × (1+r)ᵏ − M × ((1+r)ᵏ − 1) / r, where P is the original principal, r is the monthly rate, and M is the monthly payment. This is the exact same balance you would see in a standard amortization schedule at month k.
What happens if I cannot pay the balloon when it is due?
You must typically refinance the remaining balance into a new loan, sell the asset (home, car, or business), or pay the lump sum out of savings. If you cannot do any of these, the lender may foreclose or repossess. That is why balloon loans are only appropriate when you have a clear exit plan — a sale, a refinance, or a known future windfall.
Are balloon loans cheaper than a normal mortgage?
The monthly payment is usually lower, and the interest rate can be slightly lower because the lender's risk horizon is shorter. But because very little principal is paid down during the short term, total interest paid over the balloon period can be comparable to or even higher than a fully-amortized loan, and you carry the refinancing risk at the end.
Can I pay extra principal on a balloon loan?
Most balloon loans allow extra principal payments, which directly reduce the future balloon balance. Check your loan agreement for a prepayment penalty first. Even modest extra payments — say $100 or $200 a month — can materially shrink the lump sum due at the end, and this calculator's amortization logic will reflect that reduction when you model a shorter amortization schedule.
Disclaimer
This balloon loan calculator is provided for informational purposes only and does not constitute financial, lending, or tax advice. Estimates are based on the inputs you enter and the standard amortization and future-value formulas; actual loan terms, rates, balloon balances, and refinancing options vary by lender, credit profile, property type, and program. Always confirm your final payment, balloon amount, and refinancing plan directly with a licensed loan officer before committing to a balloon loan.