Loan Amortization Table With Balloon Payment Calculator

A loan amortization table with a balloon payment shows how each scheduled payment is split between interest and principal, and how much principal remains due as a large final payment. This calculator estimates the monthly payment on a loan amortized over the selected term; enter the loan amount, APR, and amortization term to see the payment and total interest. It does not calculate a custom balloon amount or produce a row-by-row table, so use the balance formula below to find the amount still owed at the balloon date.

Formula

The calculator uses the standard fixed-payment amortization formula, which assumes every scheduled payment is the same and is made monthly. Define:

• P = original loan principal, in dollars.
• APR = annual percentage rate entered as a percentage, such as 8 for 8%.
• r = monthly interest rate, calculated as APR ÷ 1,200.
• n = number of monthly payments, calculated as years × 12.
• M = monthly payment, in dollars.

M = P × r ÷ [1 − (1 + r)⁻ⁿ]. The displayed payment is rounded to the nearest cent. Total interest is calculated as M × n − P, using that rounded payment. In a balloon loan, the regular payment may instead be based on a longer amortization period than the time until the final payment. The remaining balance at the balloon date is then due as the balloon, subject to the contract’s terms.

Worked Example

Using the calculator defaults: principal P = $20,000, APR = 8%, and term = 5 years.

1. Convert the annual rate to a monthly rate: r = 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: n = 5 × 12 = 60.
3. Substitute into the payment formula: M = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰].
4. The monthly payment, rounded to cents, is $405.53.
5. Total interest using the rounded payment is $405.53 × 60 − $20,000 = $4,331.80.

This example fully amortizes the balance over 60 payments, so it has no balloon. To illustrate a balloon structure, suppose the same loan instead calls for the $405.53 payment for only 36 months, while retaining the five-year amortization schedule. The balance after 36 payments is approximately $9,291. That unpaid amount would be due at month 36 as the balloon, if the agreement defines the payment schedule that way. The actual contract may use different payment dates, rounding, or a separately stated final amount.

Assumptions

• The interest rate remains fixed for the calculation period.
• Payments are equal monthly payments, made at the end of each month.
• Interest is compounded monthly using APR ÷ 12.
• Fees, taxes, insurance, PMI, escrow, late charges, and other loan costs are excluded.
• The calculator assumes full amortization over the entered term; it does not include a balloon date or balloon-payment input.

How a Balloon Amortization Table Works

An amortization table is a schedule with one row for each payment period. A typical row reports the starting balance, interest charged, payment, principal repaid, and ending balance. For a monthly schedule, interest for a period is generally estimated as the opening balance multiplied by the monthly rate; the principal portion is the payment minus that interest. The next row starts with the previous row’s ending balance.

A balloon loan separates the amortization period from the time the loan is due. For example, payments might be calculated as though repayment lasts 20 years, while the contract requires the remaining balance after five years. Because the scheduled payments do not repay all principal by the due date, the final balance is much larger than the regular monthly payment. A balloon may be due after a stated number of payments or on a calendar date.

To calculate the balance after k regular payments at monthly rate r, use B_k = P(1 + r)^k − M[(1 + r)^k − 1] ÷ r, where B_k is the balance and M is the regular payment. In a conventional balloon structure, that balance is the estimated balloon amount immediately after payment k. If the balloon is due before or after a scheduled payment, the timing changes the calculation.

How to Read and Use the Table

Check the table’s payment count and final row against the loan documents. A row’s interest portion is not an extra charge on top of the payment: it is the part of that payment applied to interest. The rest reduces principal. Early in a standard amortization schedule, interest often makes up a larger share because the outstanding balance is higher; as the balance falls, more of each level payment goes to principal.

• Confirm the principal, APR, payment frequency, and amortization length match the contract.
• Identify the exact balloon date and whether a regular payment is due on that date.
• Look for any separately listed balloon amount, fees, or interest adjustments.
• Compare the table’s final balance with the contract’s stated payoff figure, allowing for timing and rounding differences.

A table is a projection, not proof that the lender will accept the displayed amount as a payoff. A payoff figure on a specific date can include accrued interest and contract charges not represented by a simple monthly schedule. Request the date-specific figure from the lender when exact settlement information is needed.

Common Mistakes and Limits

A frequent mistake is treating the regular payment as if it pays off the loan by the balloon date. If payments are based on a longer amortization period, that is not what the schedule promises: the balance remains due. Another mistake is entering 8 for an APR of 8% in a formula that expects 0.08, or vice versa. This calculator expects a percentage number and converts it to a monthly decimal rate.

Rounding can also produce small differences. This calculator rounds the monthly payment to cents and calculates total interest using that rounded amount, while a lender may retain more precision internally and adjust a final payment. The displayed figures are not suitable for reconstructing every contract’s exact ledger. Variable rates, irregular payment intervals, deferred payments, fees added to principal, and extra payments require additional inputs and are not modelled here.

The calculator does not decide whether a balloon can be paid, refinanced, or extended, and it does not predict future financing terms. Those details depend on the agreement and circumstances outside this arithmetic. Use the actual loan disclosure and ask the lender how it calculates the final amount.

Frequently Asked Questions

What is a balloon payment on a loan?
A balloon payment is a large final payment due after a series of smaller scheduled payments. It generally covers the remaining principal and any interest or other amounts due under the contract.

How do I calculate a balloon payment from an amortization schedule?
Find the outstanding principal after the last regular payment before the balloon date. For fixed monthly payments, use the balance formula B_k = P(1 + r)^k − M[(1 + r)^k − 1] ÷ r, then check the contract for accrued interest, fees, and payment timing.

Is the balloon payment the same as the remaining balance?
It is often based on the remaining balance, but the exact amount due can differ because of interest accrued since the last payment, timing, rounding, or charges specified in the agreement.

Does this calculator create a full amortization table?
No. It estimates a level monthly payment and total interest for full amortization over the entered term. It does not generate monthly rows or accept a balloon date; use the balance formula to estimate a balance after a chosen number of payments.

Why is the balloon amount still large after making payments?
When the payment is calculated over a longer amortization period than the time until the balloon date, the payments are not scheduled to repay all principal by that date. The unpaid balance therefore remains due as a large final amount.

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

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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