Balloon Loan Payment Calculator

Understanding the balloon loan payment calculator — concept and principle

A balloon loan has regular monthly payments that do not fully repay the debt; a large lump sum, the balloon, is due at the end. It appears in commercial property loans, some car finance deals and short-term business lending. This calculator finds the monthly payment for a given balloon, the total interest and the payment you would have without a balloon.

How it is calculated

With loan amount P, monthly rate r = annual rate ÷ 12, number of payments n = years × 12 and balloon B:

• Monthly payment a = (P − B ÷ (1 + r)ⁿ) × r ÷ (1 − (1 + r)⁻ⁿ)
• Total paid = a × n + B
• Total interest = a × n + B − P
• Without balloon = the standard payment P × r ÷ (1 − (1 + r)⁻ⁿ)

If the rate is 0%, the payment is simply (P − B) ÷ n.

The principle

Split the loan in two. The balloon is a debt you will repay in one go after n months, so today it is worth only its present value, B ÷ (1 + r)ⁿ. The rest of the loan is repaid by ordinary level payments, using the usual annuity formula. Interest still accrues on the whole balance every month, including the part the balloon will clear. That is why a balloon lowers the monthly payment but raises total interest: you keep a larger balance outstanding for longer.

Worked example

1. P = $200,000, annual rate 6% so r = 0.005, term 5 years so n = 60, balloon B = $80,000.
2. Present value of the balloon = 80,000 ÷ 1.005⁶⁰ ≈ $59,309.78.
3. Amount to amortise = 200,000 − 59,309.78 = $140,690.22.
4. Monthly payment = 140,690.22 × 0.005 ÷ (1 − 1.005⁻⁶⁰) ≈ $2,719.94, then $80,000 at the end.
5. Total paid = 2,719.94 × 60 + 80,000 ≈ $243,196.17, so total interest ≈ $43,196.17.
6. Without a balloon the payment would be $3,866.56 a month.

How to read the result

The gap between the two payments is the monthly cash-flow relief the balloon buys. The cost is higher total interest and a single large bill. Ask yourself how you will pay the balloon: from savings, from selling the asset, or by refinancing at whatever rate exists then. A balloon above the asset's likely future value is a warning sign.

Common mistakes

• Comparing only monthly payments and ignoring total interest.
• Assuming refinancing will always be available at today's rate.
• Confusing a balloon with a residual value in a lease; the rules and options differ.
• Forgetting fees and charges, which are not included here.

Frequently asked questions

Is a balloon loan the same as an interest-only loan?

An interest-only loan is the extreme case where the balloon equals the full loan amount. A partial balloon repays some principal along the way.

How big a balloon is typical?

It depends entirely on the lender and product; set the calculator to several values to see the trade-off.

Can I pay the balloon early?

Often yes, but check the contract for early repayment charges. Paying early cuts total interest.

Sources: Standard time value of money mathematics (annuity and present value formulas) · Consumer Financial Protection Bureau (CFPB), consumer guidance on balloon payments