Seller Financed Mortgage Calculator
In seller financing, the seller becomes the bank: the buyer makes monthly payments directly to them instead of a mortgage lender. This seller financed mortgage calculator turns the price, down payment, rate, and amortization into the monthly payment, and models the balloon payment most of these deals carry, so both sides negotiate with the same numbers.
Quick Answer
On a $250,000 price with $25,000 down, the seller finances $225,000 at 7% over 20 years: $1,744.42 a month in principal and interest. With a balloon at year 10, the buyer owes $150,240.76 at that point, after paying $134,571.47 in interest and $209,330.71 total over the decade.
- The seller is the lender. No bank qualifying, faster closing, and every term (rate, down payment, balloon) is negotiable.
- Most notes balloon in 3 to 10 years. The loan amortizes over 20 to 30 years but the full remaining balance comes due far sooner, usually refinanced with a bank.
- The payment is standard amortization math. Note balance, rate, and term set the payment exactly like a bank loan.
- Paperwork protects both sides. A promissory note plus a mortgage or deed of trust, ideally with a third-party loan servicer handling payments.
How seller financing actually works
Seller financing (also called owner financing or a seller carry-back) skips the bank: the buyer pays a down payment, signs a promissory note to the seller, and makes monthly payments of principal and interest. The seller earns interest income instead of a lump sum; the buyer gets flexible terms without bank underwriting. It is common for land, fixer-uppers, and buyers who cannot qualify conventionally.
$250,000 purchase price, $25,000 down at closing.
$225,000 financed at 7%, amortized over 20 years.
$1,744.42 a month, interest first, then principal.
$150,240.76 due at year 10: refinance or pay cash.
One legal note that matters: federal ability-to-repay rules can apply to residential seller financing, and some sellers’ existing mortgages carry due-on-sale clauses. A real estate attorney should draft the note and security instrument. Compare the payment against a bank loan with our mortgage payment calculator, and see the full payment-by-payment breakdown with our amortization schedule calculator.
The balloon payment: the part that surprises buyers
The balloon is the defining feature of seller-financed notes. Amortizing over 20 years keeps the monthly payment manageable, but the seller rarely wants to wait two decades for full repayment, so the note calls the entire remaining balance at year 5, 7, or 10. The buyer plans from day one to refinance with a bank by that date, ideally against an improved property and stronger credit.
Notice how little principal a 7% note retires in ten years: $74,759 of the $225,000, because early payments are mostly interest. That is why the exit strategy is the deal. If refinancing looks uncertain, negotiate a longer balloon or a fully amortizing note before signing.
Seller financing vs a bank mortgage
- No bank qualifying or appraisal required
- Rate typically 1-3% above market, negotiable
- Closing in days, minimal fees, no PMI
- Balloon risk: must refinance by the deadline
- Seller keeps a lien until paid in full
- Full underwriting: credit, income, appraisal
- Market rate, 30-year fixed available
- 30-45 day closing with origination fees
- No balloon on standard fixed loans
- Strong consumer protections and servicing rules
For the seller, the trade is steady interest income and a faster sale against default risk and delayed full payment. Sellers can also sell the note itself at closing for 80 to 90% of its face value if they prefer cash. Investors weighing a rental purchase should also run our buying rental property calculator, and anyone on the fence about buying at all can check our rent or buy calculator.
What most seller-financing calculators miss
Basic tools compute the monthly payment and stop, which hides the two numbers that decide the deal: the balloon balance and the interest burned getting there. Some cannot model a balloon at all, forcing users to pretend the note fully amortizes. Others ignore the seller’s side entirely, even though the note’s yield is the seller’s whole reason for offering terms. This calculator shows the balloon balance, the interest paid to reach it, and the full-term interest for the note, so the negotiation starts from complete numbers.
Frequently Asked Questions
The property seller acts as the lender: the buyer pays a down payment, signs a promissory note, and makes monthly payments directly to the seller instead of a bank. It is also called owner financing or a seller carry-back.
With standard amortization math: the note balance (price minus down payment), the agreed rate, and the amortization term set the payment exactly like a bank loan.
A lump sum for the entire remaining balance, due on a fixed date, usually 3 to 10 years out. The loan amortizes over 20 to 30 years to keep payments low, but the seller gets fully repaid at the balloon date.
To sell faster, attract buyers who cannot get bank loans, earn interest income well above savings rates, and sometimes command a higher price. The trade is default risk and waiting years for full payment.
Usually 1 to 3 percentage points above current bank mortgage rates, reflecting the seller’s extra risk. Everything is negotiable, including the rate, term, and balloon date.
The buyer must refinance with a traditional lender by the deadline or risk losing the property. Planning the exit before signing, and negotiating extensions in the note, is essential.
At minimum a promissory note and a mortgage or deed of trust securing the seller’s lien. Many deals add a third-party loan servicer to handle payments and records, plus title insurance.
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References
- Rental Property Analyzer. Seller Finance Calculator (balloon in 3-10 years; side-by-side terms). Accessed October 17, 2026.
- Damen Capital. Owner Financing Calculator for Land (standard loan payment math; note sale at 80-90%). Accessed October 17, 2026.
- The Money Know How. Using an Owner Carry Loan Calculator to Evaluate Seller Financing. Accessed October 17, 2026.
- REtipster. How a Mortgage Closing Works (Seller Financing Tutorial) (promissory note and mortgage documents). Accessed October 17, 2026.
- Internal Revenue Service. Publication 537: Installment Sales (tax treatment of seller-financed sales). Accessed October 17, 2026.
- BiggerPockets. Seller Financing. Accessed October 17, 2026.
- Real Estate Skills. What Is Seller Financing & How Does It Work?. Accessed October 17, 2026.
- Mortgage-Info. Seller Financing 2026: Owner Finance Mortgage Complete Guide (down 5-20%; balloon 3-10 years; servicer). Accessed October 17, 2026.
- Tanisha Ashford. How Seller Financing Works: Pros and Cons for Home Sellers. Accessed October 17, 2026.
- GoREPA. How to Use Seller Financing (aka Owner Financing) to Buy Real Estate. Accessed October 17, 2026.