30-Year Amortization With a 5-Year Balloon

A 30-year amortization with a 5-year balloon is a common seller-financing structure because the two terms control different things.

• 30-year amortization determines the scheduled monthly principal-and-interest payment.
• 5-year balloon determines when the remaining unpaid balance becomes due.

Five years comes quick. The payment can feel comfortable while a large balance is still waiting at maturity, so the number to understand is not only the monthly payment—it is also the payoff you will need to refinance, sell, or otherwise satisfy at the balloon date.

If you only want to test your own terms, use the seller financing calculator. Here is the math using one concrete example.

Example: $500,000 purchase price

• Purchase price: $500,000
• Down payment: $50,000
• Seller-financed principal: $450,000
• Interest rate: 5%
• Amortization: 30 years
• Balloon: 5 years

The seller carries $500,000 − $50,000 = $450,000.

A $450,000 balance amortized over 30 years at 5% produces a monthly principal-and-interest payment of approximately $2,415.70, or about $2,416/month.

Why the payment uses 30 years

The standard fixed-rate payment formula uses the full amortization schedule:

Payment = P × r(1+r)^n ÷ ((1+r)^n − 1)

For this example, P = 450,000, r = 0.05 ÷ 12, and n = 360.

The balloon does not replace the 360-payment math. It simply stops the note early and requires the remaining balance to be paid.

What is the balance after five years?

Five years equals 60 monthly payments. After those 60 payments, the estimated remaining principal is approximately $413,229.

That is the approximate balloon due at the end of year five. A real payoff statement may vary slightly because of payment timing, accrued interest, servicing, or transaction-specific terms.

If the question in your head is “What happens if I cannot refinance when the balloon hits?”, the calculator cannot answer the financing-market or legal part of that question. What it can do is make the exposure concrete: you can see the estimated balance you would still need to pay off.

What happened during the first 60 payments?

Metric	Approximate amount
Total scheduled P&I	$144,942
Principal reduction	$36,771
Interest paid	$108,171
Remaining balance	$413,229

The early payments are interest-heavy because the note is amortized over such a long period. The buyer can make nearly $145,000 of scheduled payments over five years and still owe more than $413,000.

The deal timeline

Closing

The buyer pays $50,000 down. The seller carries a $450,000 note.

Months 1–60

The buyer pays about $2,416 per month in principal and interest while the balance gradually declines.

End of year five

The note reaches the balloon date and the remaining balance—about $413,229 in this example—becomes due.

Balloon vs maturity vs amortization

Amortization is the theoretical schedule over which principal would reach zero if payments continued for the full period. Maturity is the date the note actually becomes due. A balloon payment is the large remaining balance due when maturity occurs before the end of amortization.

“Calculate my payment as though I had 30 years to pay this off, but make the remaining balance due after five years.”

What if the first years are interest only?

An interest-only period changes the early payment and delays principal reduction. If the balloon date stays the same, that usually means more principal remains due at maturity than under immediate amortization.

Use the interest-only seller financing calculator to compare the IO payment, later amortizing payment, balloon balance, and cash-flow step-up side by side.

How rate changes the result

On the same $450,000 principal, a lower rate reduces the required payment and more of each payment goes toward principal. A higher rate raises the required payment and increases interest expense.

That is why price, down payment, rate, amortization, and balloon should be modeled together instead of negotiated as isolated numbers.

What if the seller cares most about monthly income?

That is a different question from this example. Keep this page for the 30/5 payoff, and use the reverse seller financing calculator when the conversation starts from a monthly payment instead of a purchase price.

Check the property cash flow too

A note can be mathematically valid and still leave too little property cash flow. Use the calculator's Analysis view to test rent, operating expenses, debt service, DSCR, and cash flow after debt alongside the financing structure.