Regular monthly payment and supporting figures
The monthly payment uses the full amortization term. Interest and principal are applied through the stated balloon month, then the remaining balance is due in addition to that month’s regular payment.
To add estimated property taxes and insurance to a housing payment budget, the Mortgage Calculator shows those costs separately from principal and interest.
The formula
The monthly payment uses the full amortization term. Remaining principal is evaluated as the present value of the unpaid installments at the monthly interest rate, which avoids propagating rounded payment errors through long schedules. At full maturity it is exactly zero. Interest before the balloon equals regular payments made minus principal repaid. The remaining balance is due in addition to that month’s regular payment.
Worked balloon loan example
A 100,000 loan at zero interest amortized over 30 years requires 277.78 per month before rounding. After 60 regular payments, the remaining balloon is 83,333.33.
How to use this calculator
- Enter loan amount, annual interest rate, amortization term.
- Set balloon due after this many payments using the stated units or choices.
- Calculate and compare regular monthly payment, balance due after scheduled payments, interest before balloon, scheduled payments plus balloon.
Choosing inputs for balloon loan
Amortization length and maturity are different inputs on a balloon loan. A payment sized for thirty years can leave substantial principal unpaid when the contract matures after five years. The balloon-period control counts regular payments already made, and the result shows the balance left immediately after the final one.
The displayed balloon is additional to the regular payment in that month. If a lender quotes one combined final installment, add the regular monthly payment to the remaining-balance figure. The total output counts all modeled regular payments plus the balloon without counting principal twice.
Interpreting regular monthly payment
A lower monthly payment does not remove the future lump-sum obligation. Refinancing, selling collateral, or saving a reserve can depend on circumstances that change before maturity. This calculator describes the fixed-rate payment structure; it does not predict the availability or terms of refinancing and does not model a negotiated extension.
Assumptions & limitations
What this calculation assumes
- The rate is fixed, monthly payments are on time, and there are no extra payments.
- Balloon month cannot exceed the full amortization term.
What to keep in mind
- Fees, taxes, insurance, prepayment charges, and interest-rate resets are excluded.
Common questions
Is the balloon the entire final installment?
It is the remaining principal after the final regular payment. Add that regular payment if you need a combined maturity installment.
What if the balloon period equals the full term?
The modeled balance is exactly zero after all scheduled payments have been made.
Can refinancing be assumed at the balloon date?
No. The calculator reports the amount due, without predicting whether refinancing will be available or affordable.
Sources & further reading
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