Bullet Loan Calculator
Estimate interest-only payments, final balloon payment, and total borrowing cost.
What is a bullet loan?
A bullet loan (sometimes called a balloon structure) is a loan where most or all principal is repaid in one large payment at the end of the term. Depending on the agreement, you may either pay interest periodically (monthly, quarterly, etc.) or let interest accrue and pay everything at maturity.
This structure is common in commercial real estate, bridge financing, short-term business loans, and some private lending arrangements. It can lower cash outflow during the term, but it creates a significant refinancing or liquidity event when the final payment comes due.
How this bullet loan calculator works
Inputs
- Loan amount: Principal borrowed.
- Annual interest rate: Nominal yearly interest rate.
- Loan term: Number of months until maturity.
- Payment frequency: Monthly, quarterly, semi-annual, or annual periods.
- Interest handling: Interest-only periodic payments or fully accrued interest.
Calculation approach
For each period, interest is estimated as:
Interest = Balance × Annual Rate × (Period Months ÷ 12)
If you choose periodic interest payments, only interest is paid through the term and principal is paid in the final period. If you choose accrued interest, interest is capitalized each period and the final maturity payment includes principal plus compounded accrued interest.
Example scenario
Suppose you borrow $100,000 at 8% annual interest for 24 months with monthly interest-only payments. You would pay interest each month, then the remaining principal in the last month. If the same loan accrues interest with no interim payments, the maturity amount becomes larger because interest is added to the balance over time.
When a bullet loan can make sense
- You expect a near-term cash event (asset sale, refinance, bonus, equity round).
- You need lower required payments during a project build-out period.
- Your investment has back-loaded cash flow and cannot support full amortization early on.
Key risks to understand
1) Refinance risk
If rates rise or credit conditions tighten, replacing the loan at maturity may be harder or more expensive.
2) Liquidity risk
The balloon payment can be substantial. Without planning, borrowers may face a cash crunch at maturity.
3) Cost visibility
Low interim payments can make the loan appear cheaper than it is. Total interest paid can still be significant, especially if interest accrues and compounds.
Practical tips before committing
- Run several scenarios (different rates, terms, and payment frequencies).
- Build a refinance plan at least 6–12 months before maturity.
- Keep a repayment reserve for the final payment event.
- Compare with fully amortizing alternatives to evaluate total cost.
- Review lender covenants, prepayment penalties, and extension options.
Bullet loan vs. amortizing loan
With an amortizing loan, each payment includes both interest and principal, so balance declines steadily over time. With a bullet loan, principal decline is delayed, concentrating repayment risk at maturity. The “best” choice depends on your cash-flow profile, risk tolerance, and refinancing confidence.
Final thoughts
This bullet loan calculator is designed for planning and education. Real loan agreements may include fees, day-count conventions, compounding rules, and prepayment terms that affect the exact numbers. Always verify results with your lender, accountant, or financial advisor before making a borrowing decision.