Balloon Loan Amortization Schedule Calculator

A balloon loan amortization schedule shows each periodic payment, the part applied to interest and principal, the remaining balance, and the large final payment due at the end. Enter the loan amount, annual APR, term, and balloon balance to estimate the regular payment and see how the balance changes over the schedule.

Formula

This calculator models a fixed-rate loan with equal monthly payments and a specified balance left after the final regular payment. It finds the payment that amortizes the loan down to that balloon balance, then estimates total interest by adding all regular payments and the balloon payment and subtracting the original principal.

Let P be the loan amount in dollars, B the desired balloon balance in dollars, a the annual APR as a percentage, n the number of monthly payments, and r = a / 1200 the monthly rate as a decimal. Here, n = 12 × years. The monthly payment formula is:

Payment = (P − B / (1 + r)ⁿ) × r / [1 − (1 + r)⁻ⁿ]

The ending balance after the regular payments is calculated as P(1 + r)ⁿ − Payment × [(1 + r)ⁿ − 1] / r. Total interest, assuming the balloon is paid at maturity, is Payment × n + B − P. The formula uses an APR divided into monthly periods; the contract’s method and payment dates may differ.

Worked Example

Using the calculator’s default inputs: principal $20,000, APR 8%, five years, and a target balloon of $8,000:

1. Convert the APR to a monthly rate: r = 8 / 1200 = 0.0066667.
2. Find the number of monthly payments: n = 5 × 12 = 60.
3. Discount the balloon balance to its value at the start: $8,000 / (1.0066667)⁶⁰ ≈ $5,365.30.
4. Apply the payment formula: ($20,000 − $5,365.30) × 0.0066667 / [1 − (1.0066667)⁻⁶⁰] ≈ $297.89 per month.
5. Calculate interest using the rounded monthly payment: $297.89 × 60 + $8,000 − $20,000 = $5,873.40.

The displayed ending balloon balance is $8,000.00. Rounding each scheduled payment to cents can make a real lender’s final balance differ slightly from the target shown by an unrounded mathematical formula.

Assumptions

• The interest rate is fixed for the modeled term.
• Payments are made monthly, with the first payment one month after the loan begins.
• Interest compounds monthly at APR / 12; the formula treats the balloon as due immediately after the final regular payment.
• Fees, taxes, insurance, escrow, late charges, and payment-date adjustments are not included.

How to Read a Balloon Schedule

A full amortization schedule is a row-by-row table. Each row typically gives the payment number or date, starting balance, scheduled payment, interest charged, principal paid, and ending balance. For a balloon loan, the last row also identifies the substantial remaining balance due at maturity. This calculator summarizes the payment, interest total, and ending balance rather than generating all monthly rows.

For each period, interest is generally based on the outstanding principal and the period’s rate. The amount of a level payment left after interest reduces principal. Early payments therefore tend to contain a larger interest portion; as principal falls, more of each payment can reduce the balance. In a balloon structure, regular payments are deliberately insufficient to bring the balance to zero by the end of the term.

The balloon is not an extra fee in this calculation: it is principal still outstanding, plus any interest due under the agreement. Read the contract’s payment schedule and maturity terms to learn whether the final amount is due alongside a last regular installment or calculated another way.

Inputs, Uses, and Limits

Use the loan amount and APR that apply to the specific offer or agreement, not a guessed market figure. Enter the term as the number of years until maturity, and enter the expected balloon amount as a dollar balance. The balloon cannot exceed the starting loan amount in a normally amortizing fixed-rate example; an unusually structured agreement may need a different calculation.

• Compare payment structures: See how a stated balloon balance changes the modeled monthly payment compared with paying the loan down fully.
• Check a quoted schedule: Compare the estimate with the lender’s payment schedule, while allowing for rounding and contract-specific calculations.
• Understand the end date: Focus on both the recurring payment and the balance still due. The monthly amount alone does not describe the full repayment obligation.

This calculator does not create a legally binding amortization table or determine a lender’s exact payoff figure. Variable rates, irregular payment intervals, daily interest, fees added to principal, missed payments, and extra payments can change the schedule. The balloon amount is an input; the calculator does not decide how it will be paid. Ask the lender for the applicable figures and written terms.

Common Questions and Misconceptions

A balloon loan is not the same as an interest-only loan. Interest-only payments may leave the principal largely unchanged during a specified period; a balloon loan can include principal repayment in regular installments while still leaving a substantial balance due at maturity. The actual payment structure depends on the agreement.

Another common misunderstanding is that the displayed monthly payment is the total cost. It is only the regular installment estimate. Include the final balloon, any charges in the contract, and the timing of payments when reviewing the full repayment schedule. A lower installment can coincide with a larger maturity balance.

Frequently Asked Questions

What is a balloon loan amortization schedule?
A schedule showing periodic payments and how each affects interest and principal, while tracking the balance left for a large payment at the end of the term.

How do I calculate a balloon loan payment?
Discount the balloon balance back over the number of monthly periods, subtract that present value from the principal, then calculate the level payment needed for the remainder at the monthly interest rate. The formula above shows the calculation.

Does the balloon payment include interest?
It represents the balance due under the contract at maturity. Whether additional interest or charges are included in a quoted payoff depends on the agreement and payoff date; this estimate assumes the stated balloon is the final balance.

Can I get a full month-by-month schedule from this calculator?
This page estimates the level payment, total modeled interest, and ending balance. To construct each row, calculate period interest from the starting balance, subtract it from the payment to get principal reduction, and subtract that reduction from the balance.

Why might my lender’s balloon figure differ?
Payment dates, daily versus monthly interest calculations, rounding, fees, rate changes, and contract terms can affect the amount. Request the lender’s written schedule or payoff quote for the exact figure.

This result is an estimate, and the lender’s disclosure gives the exact figures.

Related

• Loan Term Flexibility: Compare Monthly Payments
• Loan Term in Months: Convert Years to Months
• Loan Term Exceeded? Calculate the Payment and Interest

in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
in bal | Balloon balance at end | $ | 8000 | 0 | 100000000
out pmt | Monthly payment | $ | (p - bal / (1 + apr / 1200) ^ (yrs * 12)) * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest paid | $ | pmt * yrs * 12 + bal - p | 2
out end | Ending balloon balance | $ | p - pmt * (1 - (1 + apr / 1200) ^ -(yrs * 12)) / (apr / 1200) * (1 + apr / 1200) ^ (yrs * 12) | 2