A seller financing promissory note is the written instrument that converts a private real estate sale into an enforceable debt when the seller, rather than a bank, extends credit to the buyer. To hold up, it needs the parties and principal stated precisely, a payment schedule and maturity date that match the purchase agreement, an interest rate that sits above the IRS applicable federal rate and below the state’s usury cap, default and acceleration language, and a reference to a recorded security instrument tying the debt to the property. It also has to fit inside one of the Dodd-Frank exclusions for individual sellers, or the seller becomes a regulated loan originator.
Core Terms the Note Must State
Start with the parties. Full legal names and mailing addresses for buyer and seller, matching the names on the purchase agreement and the deed. The principal balance should appear as a numeral and spelled out in words. That belt-and-suspenders approach prevents later arguments about a mistyped figure.
The payment schedule needs the installment amount, the frequency (usually monthly), the date of the first payment, and the date of the final payment. If the note calls for a balloon, state the exact dollar amount of the balloon and the date it comes due. Language like “remaining balance due at maturity” without a figure invites a fight when maturity arrives.
The maturity date sets the outer boundary. For a fully amortizing note, the last scheduled installment retires the debt. For a note with a balloon, the maturity date is when the lump sum hits. Every dollar figure and every date should match the purchase agreement. Inconsistencies give a defaulting buyer something to challenge.
Setting the Interest Rate
The interest rate has to clear two separate legal hurdles. State usury statutes cap what a private lender can charge, and caps vary by state. Exceeding the ceiling can void the interest entirely or trigger penalties. Check the usury rule in the state where the property sits and keep the note’s rate comfortably below it.
The floor comes from the IRS. Charging less than the applicable federal rate on a seller-financed sale with payments stretching beyond one year causes the IRS to treat part of each principal payment as disguised interest income, a rule known as imputed interest.1Office of the Law Revision Counsel. 26 U.S. Code 483 – Interest on Certain Deferred Payments The IRS publishes new AFRs monthly. As of June 2026, the long-term AFR (for loans over nine years, which covers most seller-financed mortgages) is 4.87% compounded annually.2Internal Revenue Service. Revenue Ruling 2026-11, Applicable Federal Rates Using at least the AFR published in the month the note is signed avoids the issue.
Most seller-financed notes land between 5% and 8%, which usually satisfies both requirements.
Late Fees, Grace Periods, and Default
A useful note explains what happens when the buyer doesn’t pay on time. Three provisions carry the weight.
A grace period gives the buyer a cushion before a late fee applies. Fifteen days is the standard on residential mortgages. State the number of grace days and make clear that a payment received within that window counts as timely.
The late fee clause sets the penalty once the grace period ends. Late charges on residential mortgages typically run 3% to 6% of the monthly payment. Overly aggressive fees can be struck down as unenforceable penalties, so keep the number conventional and spell out the exact calculation.
Default provisions define breach beyond a missed payment. Failing to maintain property insurance, letting tax liens accumulate, or allowing the property to deteriorate are common additions. Require written notice of default and give the buyer a defined cure period before the seller can accelerate or move toward foreclosure.
Protective Clauses to Include
Acceleration Clause
An acceleration clause lets the seller demand the entire remaining balance if the buyer defaults. Without it, the seller can only chase each missed payment individually. Trigger the clause on a material breach, and require written notice and a reasonable cure period before it fires.3Cornell Law Institute. Acceleration Clause
Prepayment Terms
State whether the buyer can pay off early and whether there’s a penalty for doing so. Sellers who want to protect expected interest income often want a penalty. Buyers who plan to refinance push back. Either way, the note has to take a clear position. Silence usually kicks the question to state law, which varies.
Security Instrument Reference
A promissory note by itself is unsecured debt. To give the seller a right to foreclose, the note must reference a separate security instrument, either a deed of trust or a mortgage depending on the state. That security instrument names the specific property as collateral and gets recorded with the county to create a public lien.4Department of Housing and Urban Development. Model Subordinate Note Form and Model Subordinate Mortgage Form Skip this and the seller becomes a general creditor with no priority claim on the property.
Federal Compliance Under Dodd-Frank
Seller-financed transactions are not fully exempt from federal mortgage rules. The note’s terms have to fit inside one of two exclusions, or the seller is treated as a mortgage loan originator with full licensing and compliance obligations.
One-Property Exclusion
A natural person, estate, or trust that finances the sale of only one property in any 12-month period qualifies for the lighter set of requirements, provided the seller owned the property and was not the builder. The financing must use a fixed rate or an adjustable rate that doesn’t reset for at least five years, and the payment schedule cannot produce negative amortization. Balloon payments are permitted.5eCFR. 12 CFR 1026.36 – Prohibited Acts or Practices and Certain Requirements for Credit Secured by a Dwelling
Three-Property Exclusion
Sellers financing up to three properties in a 12-month period face stricter terms. The loan must be fully amortizing, so no balloon at all. The seller must make a good-faith determination that the buyer can reasonably repay the loan, documented with income or asset verification. The same interest structure applies (fixed, or adjustable after five or more years, with reasonable annual and lifetime caps), and any adjustable rate must be tied to a widely available index like SOFR or U.S. Treasury securities.5eCFR. 12 CFR 1026.36 – Prohibited Acts or Practices and Certain Requirements for Credit Secured by a Dwelling
Both exclusions prohibit mandatory arbitration clauses and any provision requiring the buyer to waive federal claims. A seller who violates the ability-to-repay rules under 15 U.S.C. ยง 1639c is exposed to a buyer recovery equal to all finance charges and fees paid over the life of the loan.6Office of the Law Revision Counsel. 15 USC 1640 – Civil Liability for Violations The buyer can also raise the violation as a defense or counterclaim in a foreclosure action. A note with an interest-only balloon structure used under the three-property exclusion is a compliance failure from day one.
Due-on-Sale Risk if the Property Has a Mortgage
This one catches sellers by surprise. If the seller still owes on a mortgage against the property, that mortgage almost certainly contains a due-on-sale clause. Federal law authorizes the existing lender to demand full repayment of the loan when the property is sold or transferred.7Office of the Law Revision Counsel. 12 U.S. Code 1701j-3 – Preemption of Due-on-Sale Prohibitions
Seller financing is a sale. If the existing lender learns of the transfer, it can accelerate the seller’s original mortgage. The statutory exceptions cover transfers to a spouse, transfers into a living trust, and transfers on the borrower’s death, but none of them cover a seller-financed sale to an unrelated buyer.7Office of the Law Revision Counsel. 12 U.S. Code 1701j-3 – Preemption of Due-on-Sale Prohibitions
The safest approach is to offer seller financing only on properties owned free and clear. Otherwise the seller should pay off the existing loan at closing from the buyer’s down payment, obtain written consent from the existing lender, or accept the risk of acceleration for the life of the note.
Tax Reporting the Seller Will Carry
Seller financing creates an installment sale. The seller reports income every year payments are received, not just in the year of sale.8Internal Revenue Service. Publication 537, Installment Sales
Each payment splits into three pieces: return of the seller’s original cost basis (not taxed), gain on the sale (taxed as capital gain), and interest income (taxed as ordinary income). The gain portion is calculated using a gross profit percentage applied to every principal payment received in a given year.8Internal Revenue Service. Publication 537, Installment Sales
Sellers report installment sale income on Form 6252 every year of the agreement, and interest income on Schedule B. If the buyer uses the property as a personal residence, the seller must provide their Social Security number so the buyer can deduct the mortgage interest, and the seller reports the buyer’s name and SSN on Schedule B.8Internal Revenue Service. Publication 537, Installment Sales When the seller receives $10 or more in interest during a tax year, the seller must issue Form 1099-INT to the buyer.9Internal Revenue Service. About Form 1099-INT, Interest Income The interest rate in the note is a number the IRS will check against the AFR for years.
Signing and Recording
Both parties sign at closing, ideally in front of a notary. Notarization makes the document self-authenticating in court. The seller keeps the original signed note; the buyer gets a copy.
The promissory note itself is not recorded. The security instrument is. Whether the state uses a deed of trust or a mortgage, that document has to be filed with the county recorder or clerk to establish a public lien against the property. Recording fees vary by jurisdiction.
Recording establishes priority. If the buyer later borrows against the property, the recorded lien puts the seller ahead of junior creditors. An unrecorded security instrument is enforceable between buyer and seller but offers no protection against a third-party lender who has no notice of the seller’s lien. File it promptly after closing.
Selling or Transferring the Note Later
A properly drafted note is a negotiable instrument the seller can sell to a note investor or transfer to another party. To qualify as negotiable under Article 3 of the UCC, the note must contain an unconditional promise to pay a fixed amount, be payable on demand or at a definite time, and be payable to order or bearer.10Legal Information Institute. UCC 3-104 – Negotiable Instrument
Transfer happens through endorsement. A blank endorsement (just the seller’s signature) makes the note payable to the holder. A special endorsement names a specific new payee, which is safer because it blocks an unauthorized person from collecting on a lost or stolen note. A “without recourse” endorsement means the new holder can’t come back to the seller if the buyer defaults.
If the note is transferred, the buyer must receive adequate notice of the new holder’s identity. Until that notice arrives, payments made to the original seller are still valid.10Legal Information Institute. UCC 3-104 – Negotiable Instrument Build a written-notice requirement into the note so any future transfer follows a clean paper trail.