Amortization Schedule Calculator With Balloon Payment

An amortization schedule calculator with a balloon payment estimates the regular monthly payment, the balance due as a final balloon, and the interest paid over a loan’s stated term. Enter the loan amount, annual interest rate, term, and balloon amount to see how a partially amortizing loan differs from one fully repaid through monthly payments.

Formula

Important limitation: the required calculator block above calculates a fully amortizing loan; it does not accept a balloon amount or compute a balloon balance. Its payment formula therefore assumes the balance reaches zero after the final scheduled payment. Use the formulas below to understand or independently estimate a balloon loan; do not interpret the calculator outputs as balloon-loan results.

For the calculator block, the monthly payment is PMT = P × r / [1 − (1 + r)⁻ⁿ], rounded to cents, where P is the starting loan principal in dollars, r = APR / 1200 is the monthly rate as a decimal, and n = years × 12 is the number of monthly payments. Total interest is I = PMT × n − P, using the rounded monthly payment.

For a balloon loan with level monthly payments, a stated balloon amount B is due immediately after the final scheduled monthly payment. To calculate the regular payment that leaves that balance, use PMT = [P − B / (1 + r)ⁿ] × r / [1 − (1 + r)⁻ⁿ]. The projected balance after k payments is Balance(k) = P(1 + r)^k − PMT × [(1 + r)^k − 1] / r. For a balloon defined as the remaining balance rather than entered as a target, calculate this balance at the end of the term. Actual contracts may use different payment timing, rate conventions, or fees.

Worked Example

The required calculator defaults are a $20,000 principal, 8% APR, and five years. These produce a fully amortizing payment, not a balloon-loan payment:

1. Convert the annual rate to a monthly decimal: r = 8 / 1200 = 0.0066667.
2. Count the scheduled payments: n = 5 × 12 = 60.
3. Substitute into the payment formula: PMT = 20,000 × 0.0066667 / [1 − (1.0066667)⁻⁶⁰] ≈ $405.53, rounded to cents.
4. Use the rounded payment for the total: $405.53 × 60 − $20,000 = $4,331.80 in total interest.

For comparison only, if a separate balloon-loan agreement used these same principal, rate, and term inputs and specified a $5,000 balloon due after payment 60, the payment formula above would give a lower monthly payment than the fully amortizing example. The $5,000 would still be due at the end; it would not be included in the example calculator’s outputs.

Assumptions

• The calculator assumes the APR stays fixed throughout the term.
• Payments are level monthly payments made at the end of each monthly period.
• Interest compounds monthly at APR divided by 12.
• There is no balloon, extra payment, or payment holiday in the calculator’s formula.
• Fees, taxes, insurance, PMI, and escrow are not included.

How a Balloon Amortization Schedule Works

An amortization schedule lays out each payment period, the interest charged, the principal repaid, and the remaining balance. In a standard fully amortizing loan, the scheduled payments are designed to reduce the balance to zero by the end. In a balloon loan, the regular payments do not pay off the full principal within the stated term. The remaining amount is due as a larger final payment, called the balloon.

For each period, interest is generally calculated on the outstanding balance. The payment portion left after interest reduces principal. Early in a repayment schedule, the interest portion may be larger because the balance is higher; as principal falls, the interest portion usually falls too, assuming a fixed rate and regular payments. A balloon changes the amount that must remain unpaid at the end, not the fact that interest accrues during the loan.

How to Use a Balloon Calculator

A calculator specifically designed for balloon loans should accept the balloon amount or balloon percentage as an input. Check that it also identifies whether the balloon is due after the last regular payment and whether the displayed payment is rounded. The calculator block on this page lacks a balloon input, so it cannot calculate a balloon schedule or balloon payment directly.

• Enter the principal actually borrowed, rather than the amount of a future payment.
• Use the annual APR stated for the loan and the contract’s payment frequency.
• Enter the term as the number of scheduled payment periods; confirm whether a quoted term means months or years.
• For an independent balloon calculation, provide the target final balance or use the calculated ending balance as the balloon.
• Compare the schedule’s final balance with the agreement’s stated balloon, allowing for the contract’s rounding and payment rules.

A balloon specified as a percentage must first be converted to dollars using the principal the contract defines as the base. Confirm whether the percentage applies to original principal or another amount instead of assuming the meaning.

Reading Results and Common Problems

A lower regular payment does not mean the debt has disappeared: the balloon remains payable at maturity. A schedule that shows only the monthly payment can hide this final obligation. Review the outstanding balance after every payment, the date the balloon is due, and whether the displayed total interest includes all scheduled interest through that date.

• Rounding: The calculator rounds the monthly payment to cents, then uses that rounded payment for total interest. A lender’s payment-by-payment rounding can create a small difference.
• Payment timing: Payments at the beginning of a period rather than the end change the interest calculation.
• Fees and charges: Fees may affect the amount financed or the cost shown in a disclosure, but they are not included in these formulas.
• Rate changes: A variable rate cannot be represented accurately by one fixed APR for the entire schedule.
• Final-payment treatment: Some schedules adjust the last payment for rounding or use a different due-date convention. Use the loan documents for the contractual amount.

Frequently Asked Questions

Can this calculator calculate my balloon payment?
No. Its required inputs do not include a balloon amount, and its formula fully amortizes the loan. A balloon-capable calculator needs a target balloon or must calculate the ending balance separately.

Is a balloon payment included in monthly payments?
No. A balloon is a separate large payment due at the end of the stated term. Regular scheduled payments reduce the balance but do not fully repay it in a balloon structure.

Does a balloon loan have an amortization schedule?
It can. The schedule shows the periodic interest, principal reduction, and remaining balance, then identifies the final balloon due. The schedule should make clear whether the balloon follows the last regular payment.

Why does my lender’s payment differ from a calculator result?
Possible reasons include a different rate convention, payment date, financed fees, variable rates, daily interest, or rounding rules. Compare the calculator’s assumptions with the lender’s loan disclosure and payment schedule.

Does paying the balloon mean the loan is fully paid off?
The balloon is intended to cover the remaining principal under the stated schedule, but the exact payoff can depend on the payment date, accrued interest, and contract terms. Confirm the amount due with the lender before making a final payment.

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

Related

• Interest Rate Models: How They Work and What They Show
• Interest Rate Movements: How They Affect Loan Payments
• Interest Rate Meeting Calculator: Estimate Loan Payments

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
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2