Repossession of Personal Property from an Installment Payment Sale Calculator
Estimate the remaining balance and payment on an installment payment sale.
A worked example
Running this tool on current national benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)) — swap in your own numbers to see how the result moves.
- Solve for
- Monthly payment
- Financed balance
- $18,000
- Interest rate (APR)
- 9%
- Loan term
- 4 years
- Extra monthly payment
- $0
$18,000 at 9.00% over 4 years
- Loan amount$18,000
- Monthly payment$447.93
- Total interest$3,501
How the monthly payment changes with financed balance
Holding the other inputs at the example above, here is how the result moves as financed balance changes.
| Financed balance | Monthly payment | Loan amount |
|---|---|---|
| $9,000 | $223.97 | $9,000 |
| $18,000 | $447.93 | $18,000 |
| $27,000 | $671.90 | $27,000 |
| $36,000 | $895.86 | $36,000 |
The math behind it
This calculator models an installment sale as an amortizing obligation. From the financed balance, the interest rate, and the remaining term, it computes the fixed monthly payment that clears the balance, plus the total interest and the payoff schedule. It can also solve for the balance that a chosen payment supports.
Assumptions & limits
- The obligation is treated as a standard fixed-rate, fully amortizing loan with no balloon payment.
- The rate entered is the periodic interest rate applied to the declining balance.
- It produces the payment and remaining balance on the buyer's obligation, not the taxable gain or loss from an actual repossession.
- Late fees, charges, and repossession costs are not part of the calculation.
Common questions
What does this calculator compute?
It computes the monthly payment, total interest, and remaining balance on an installment-sale obligation — the amortization of the buyer's balance over the term. It answers what the payment and payoff look like, not the tax consequences of a repossession.
What is an installment sale?
An installment sale is one where the buyer pays over time in a series of payments rather than all at once. Each payment typically combines interest and a portion of principal, steadily reducing the balance owed — exactly the amortizing structure this calculator models.
How do I calculate the tax gain or loss on the repossession itself?
That is handled separately under IRS Publication 537. In general, your gain or loss on repossessing personal property is the property's fair market value minus your basis in the buyer's obligation (the unpaid balance reduced by unrealized gross profit), less repossession costs. This calculator covers the payment and balance math; use the publication or a tax advisor for the gain-or-loss figure.