Investment Strategy
Seller Financing in Plain English, Structured by AI
The price was never the only lever. Here is how the terms get solved, not guessed.
Most deals die on price. The seller wants a number the rent cannot support at a 7% bank loan, you offer less, and everyone walks. Seller financing is the second lever: keep the price closer to what the seller wants and change the terms instead. The math behind it is exact, which is why it is a good job for software and a bad one for a napkin. This guide explains the structure and shows an AI solving it.
How seller financing works
The seller owns the property outright. You agree a price, pay part of it at closing, and sign a note to the seller for the balance. The note carries an interest rate, an amortization period that sets the monthly payment, and often a balloon date, three to seven years out, when whatever is left is due and you refinance or sell.
Price = Cash at closing + Seller note principal
The note's payment comes from its principal, rate and amortization, exactly like a mortgage. The balloon is the balance remaining on the balloon date.
Why would a seller do it? Three reasons come up again and again. They net more than a cash buyer offers, they receive interest on money that would otherwise sit in a bank, and they spread the tax hit over years instead of taking it all at once. A seller who does not need the whole cheque today is often better off.
| Term | What it is | Who it helps |
|---|---|---|
| Price | What the seller is paid in total | Seller, when it stays close to asking |
| Cash at closing | Your down payment, paid to the seller | Seller wants more; you want less |
| Note rate | Interest on the balance you owe | Below bank rates it is what makes your cash flow work |
| Amortization | Years the payment is calculated over | Longer means a lower payment for you |
| Balloon | When the remaining balance is due | Shorter means the seller is out sooner |
Why the rate is the whole lever
Take a house valued at $342,000 that rents for $2,650 a month, with a seller asking $360,000. With a bank loan at 7% and 20% down, the mortgage payment alone is about $1,900, and after taxes, insurance and reserves the deal loses money every month. No discount the seller would accept fixes that.
Now keep the price at $355,000 but have the seller carry the balance at 5% instead of the bank at 7%. The payment drops by several hundred dollars, and the same rent that lost money now clears a $200 monthly floor. The seller gets more than a cash offer, plus five years of interest. Nothing about the property changed. Only the terms did.
A worked example: solved by Remy
Here is the same house handed to Remy, the AI Agent inside Smart Rental Investor: "the seller owns it free and clear and is asking 360k. Can seller financing work?" He pulled the value and rent, applied the creative financing engine's defaults, and solved to a $200 monthly cash flow floor.
Seller financing on a $355,000 offer, seller carries the note at 5%
- Cash to the seller at closing15% down
- $53,250
- Seller note principalAt 5%, 30-year amortization
- $301,750
- Monthly note payment
- −$1,620
- Operating costsTaxes, insurance, vacancy, repairs, reserves
- −$823
- Monthly rent
- $2,650
- Monthly cash flow
- +$207

Example uses public listing data for illustration. See disclaimer.
The point is not the specific numbers, which are illustrative. It is that every one of them was solved together: change the balloon to seven years or the floor to $300 and the whole structure re-solves, in the chat or on the page.
The seller's side, so you can make the case
A creative offer is a negotiation, and the seller will ask the obvious question: why should I? The answer has to be in dollars they can compare. Smart Rental Investor's creative financing analysis shows the seller's view beside yours: cash at closing, monthly income, interest earned over the note, the balloon, and the total against a cash sale.
| Cash buyer at $342,000 | Seller financing at $355,000 | |
|---|---|---|
| Cash at closing | $342,000 | $53,250 |
| Monthly income | None | $1,620 for five years |
| Interest earned | None | About $72,500 |
| Balloon in year five | None | About $277,000 |
| Total received | $342,000 | About $427,000 |
A seller who needs every dollar at closing takes the cash. A seller who does not is usually better off on terms, and now has the numbers that say so.

Example uses public listing data for illustration. See disclaimer.
The conversation, start to offer
The whole thing runs as a chat, and each step is a real tool doing real work behind the sentence.
Describe the seller's situation
Owns free and clear, or still owes with a balance, a rate and years remaining. That decides the structure: seller financing, or subject-to with a carryback for the gap. Remy asks for what he needs rather than assuming it.Confirm the inputs before market data is spent
He shows the asking price, the value and rent he will pull, and the engine's defaults: a 10% cash-on-cash target or a $200 monthly floor, 6% commission and 2% closing on a later sale, 2% buying costs. Change any of them, then say run.Read the solved structure and the seller's side
Price, cash at closing, the note and its payment, your cash flow and DSCR, and what the seller receives. Ask where you can give ground and still hit the target; he answers from the solve, never above a rate ceiling.Have the offer written
The message quotes the structure, not just a price: the down payment, the note terms and the balloon, on your own letterhead. It is a draft. You review it and send it from your own email.

Example uses public listing data for illustration. See disclaimer.
The risks the numbers do not show
A balloon is a refinance you have not qualified for yet. If rates are higher in year five, or the property appraises low, the balance is still due. Plan the exit before you sign, and model a refinance at a rate above today's.
On a subject-to deal, the seller's lender can call the loan when the property changes hands. Most do not while payments arrive on time, but the clause exists, and the seller deserves to hear it before they agree. Smart Rental Investor puts that disclosure in the offer terms for exactly that reason.
Finally, an AI solved these terms from estimates. Verify the value against the comparables, the rent against the listings, and the seller's ownership against the title. Then have an attorney draft the note. For the underwriting the offer rests on, see how AI deal analysis works.
Frequently asked questions
What is seller financing?
The seller acts as the bank. Instead of paying the full price at closing, you pay a down payment and sign a note to the seller for the rest, with an interest rate, an amortization period and usually a balloon date when the balance is due. The seller receives monthly payments and interest instead of one cheque.
When does seller financing make sense?
When the seller owns the property free and clear, does not need all the cash at once, and the price would not work with a bank loan at today's rates. A lower rate on the seller's note can turn a deal that loses money into one that cash flows, and the seller often nets more than a discounted cash sale.
What does the AI actually solve?
Given the asking price, the property's value and rent, and your target, Remy solves the structure: the offer price, the cash to the seller at closing, the note's principal, rate, amortization and payment, and any balloon. It shows your cash flow and the seller's side. It never proposes terms outside what it solved.
What if the seller still has a mortgage?
Then the structure is subject-to, with a seller carryback for the gap if needed. Remy asks for the loan balance, rate and years remaining, because those payments become yours, and the offer is shaped around them.
Is an AI-structured offer safe to send?
It is a starting point built from real figures, not a contract. Have an attorney draft the note and deed, confirm the seller's ownership and any liens, and treat every number as an estimate to verify. Remy says exactly that in every reply.
Keep reading
AI Deal Analysis: One Address, Every Number, in a Chat
The rental underwriting the creative offer is built on.
Read articleHow to Calculate Cash-on-Cash Return
The target the structure is solved against.
Read articleDSCR Explained
Why a lower payment changes what a property can carry.
Read articleCan ChatGPT Analyze a Rental Property? Where It Fails
Why terms solved on live data beat terms sketched from memory.
Read articleStructure your next offer on terms
Tell Remy what the seller owes and is asking. He solves the seller-financing or subject-to structure to your target, shows both sides, and drafts the message you send.
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