Balloon Payment Calculator
Many commercial loans size the payment against a long amortization schedule but mature years earlier, leaving a lump sum due at the end. Enter your amount, down payment, rate, amortization period, and loan term to see the monthly payment and exactly how much principal is still owed on the balloon date.
The payment is sized on the amortization period. The loan actually ends on the balloon due date — every dollar of principal still outstanding on that date is the balloon.
Payment schedule through maturity (by year)
Each row shows one year of scheduled payments and the principal balance left at the end of it. The highlighted row is the maturity year — the closing balance on that row is the balloon.
| Year | Payments | Principal paid | Interest paid | Balance at year end |
|---|
How the balloon payment calculator works
A balloon loan runs on two different clocks, and the gap between them is the entire story. The first clock is the amortization period — the imaginary schedule the lender uses to size your payment. The second is the term, the date the contract actually ends. On a fully amortizing loan the two clocks are the same length, the last scheduled payment lands exactly on zero, and you walk away. On a balloon loan the amortization clock runs long (often 20, 25, or 30 years) while the term clock stops early (commonly 3, 5, 7, or 10 years). The payments were never designed to retire the debt in that window, so whatever principal is left standing on the maturity date comes due all at once.
The math runs in two steps. First the payment is calculated against the full amortization schedule, exactly as if the loan would run its entire length:
where P is the amount financed, r is the monthly rate (annual rate ÷ 12), and n is the number of months in the amortization period — not the term.
Second, that payment is projected forward to the maturity month to find what is still owed. Rather than looping through every month, the calculator uses the closed-form balance formula, which gives the exact balance after any number of payments k:
The first term is what the debt would have grown to with no payments at all; the second is the future value of the payments you did make. The difference is your balloon. When the rate is zero the formula collapses to Balancek = P − PMT × k.
Why the balloon is so much larger than people expect
The most common surprise is how little principal five years of faithful payments actually retires. Amortization is back-loaded by construction: interest accrues on the outstanding balance, so when the balance is near its peak, most of each payment is consumed by interest and only a thin slice reduces principal. On a $500,000 loan at 7% amortized over 25 years, the payment is about $3,534 a month. Over five years that is roughly $212,000 out the door — but only about $44,000 of it reduced principal. The balloon at year 5 is still around $456,000, or about 91% of what was originally borrowed. The other $168,000 was interest. The schedule above makes this visible year by year: watch how slowly the balance column moves in the early rows.
Three levers change that picture. A longer amortization period lowers the monthly payment but slows principal reduction, so it makes the balloon bigger. A longer term gives the schedule more time to work, so it makes the balloon smaller. A higher rate pushes more of each payment into interest, which also makes the balloon bigger. A down payment lowers the amount financed and scales the whole picture down proportionally. Adjust each input in isolation and the direction of the effect becomes clear immediately.
The refinance question at maturity
A balloon is not a penalty or a trick, and it is not free money either — it is a financing structure that shifts a decision to a future date. The balance is contractually due on the maturity date, and it has to be satisfied somehow: refinanced into a new loan, paid from cash or from the sale of the asset, or extended by agreement with the lender. The honest point is that none of those paths can be guaranteed at closing, because they depend on conditions that exist five or seven years from now, not today.
Concretely, a refinance at maturity is underwritten fresh. It depends on the interest rates available at that time, which may be higher or lower than your current one; on the appraised value of the collateral, which may have risen or fallen; on your business's financials and credit at that point; and on whether lenders are broadly willing to lend in that market. A borrower who refinances a $456,000 balloon at a materially higher rate will face a materially higher payment on the new loan. A borrower who refinances at a lower rate will face a lower one. Neither outcome is knowable in advance.
That is the trade-off in plain terms. The balloon structure buys a lower monthly payment now — because you are paying on a 25-year schedule instead of a 5-year one — in exchange for accepting refinancing risk and a large obligation on a known date. Some borrowers deliberately match the term to a planned event, such as selling the property or paying the balance off from reserves. Others plan to refinance. What the numbers on this page can tell you is the exact size and timing of the obligation. What they cannot tell you is what the market will look like when it arrives. Reading the loan documents for the prepayment terms, any extension option, and how the maturity date is defined is part of understanding the same structure.
Frequently asked questions
What is a balloon payment?
A balloon payment is the lump sum of principal still outstanding when a loan reaches maturity. It happens when the payment is sized against a long amortization schedule, such as 25 years, but the loan contract ends much sooner, such as year 5. The monthly payments never had enough time to retire the balance, so whatever principal remains falls due in one payment on the maturity date.
How is a balloon payment calculated?
First the payment is computed on the full amortization period: PMT = P x r / (1 - (1 + r)^-n), where n is the number of months in the amortization schedule. Then the balance is projected forward to the maturity month k using Balance = P x (1 + r)^k - PMT x (((1 + r)^k - 1) / r). That remaining balance is the balloon. If the interest rate is zero, the balance is simply P minus PMT times k.
Why is the balloon so large compared to what I paid?
Amortization is back-loaded. In the early years of a long schedule, most of each payment covers accrued interest and only a thin slice reduces principal. A loan amortized over 25 years typically retires under 10 percent of its principal in the first five years, so the balloon at year 5 can still be roughly 90 percent of the original amount even though five years of payments were made on time.
What happens if I cannot pay the balloon at maturity?
The balance is contractually due on the maturity date. Borrowers generally refinance it, sell or otherwise liquidate the financed asset, pay it from cash reserves, or negotiate an extension with the lender. None of those outcomes is guaranteed in advance, because refinancing depends on the interest rates, credit conditions, property values, and business performance that exist on the maturity date rather than the ones in place at closing. Failure to satisfy the balance is a default under most loan agreements.
Can a loan have no balloon payment at all?
Yes. If the term equals or exceeds the amortization period, the scheduled payments retire the entire balance and nothing is left at maturity, so the balloon is zero. That is a fully amortizing loan. This calculator reports a balloon of zero in that case rather than a negative number, since a loan cannot be paid down past a balance of zero.
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This calculator is for educational and informational purposes only and does not constitute financial, legal, tax, or lending advice. Estimates are based on the values you enter and standard financial formulas. Confirm all figures with a qualified professional before making decisions.