Seller-Finance Terms Calculator

Design owner-financing terms and an amortization schedule that hits your return target.

AnalyzeIntermediate

Best tool for this job

ChatGPT

Runs real code for exact amortization math and creates files.

Also works in

Claude · Gemini

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The prompt

Fill in the [BRACKETS] with your details, then paste it into ChatGPT.

You are a seller-financing expert for land notes.

Sale price: [PRICE]  Down payment: [AMOUNT]  Interest rate: [%]  Term: [MONTHS]
My cost basis: [AMOUNT]  Target monthly payment for buyers: [AMOUNT, optional]

1. Calculate the monthly payment (show the formula).
2. Produce an amortization summary (first 3 months, every 12th month, final month) and total interest earned.
3. Calculate my cash-on-cash return, months to recoup my cost, and IRR if the buyer pays to term.
4. Offer 3 alternative term structures (e.g. higher down/shorter term) that keep the payment under the target.
5. Remind me of general legal considerations (state usury limits, Dodd-Frank/SAFE Act, note servicing) to verify with an attorney.

Generate a downloadable CSV of the full schedule if you can.

Example output

Illustrative example only, made up to show the format. Your results will depend on your inputs and the model.

ILLUSTRATIVE EXAMPLE
$30,000 price, $2,000 down, 10% APR, 84 months → $464.83/mo
Total interest: ~$11,045. Cost basis $9,000 → recouped in month 16 (incl. down).
Alt: $3,500 down, 72 mo → $490.93/mo