To structure a seller financing deal for a business, you settle seven things in writing before closing: the purchase price and down payment, the interest rate, the repayment schedule, the collateral and how it’s perfected, any personal guarantee, a non-compete and transition plan, and the default remedies. Get those right in a promissory note, a security agreement, and a filed UCC-1, and the deal will hold up. Skip any of them and you’re relying on goodwill.
The typical arrangement has the buyer put 10% to 30% down in cash and the seller carry the balance as a loan. Everything else is negotiation inside that frame.
Purchase Price and Down Payment
The total price sets every other number. Both sides benefit from a professional business valuation before agreeing on it. Once the price is fixed, the buyer’s cash at closing determines how much debt the seller carries and how exposed the seller really is.
A larger down payment lowers the seller’s risk and shows the buyer has real capital committed. Subtract the down payment from the price and you have the seller note balance. Measured against the buyer’s total equity, that balance produces a debt-to-equity ratio. Above 3:1, a seller should be nervous. Closer to 1:1, the buyer is well-capitalized and the deal has room to survive a bad quarter.
Setting the Interest Rate
The rate is negotiable, but not freely. For a debt instrument issued in exchange for property, which includes a business, the IRS uses the Applicable Federal Rate to test whether the note carries adequate stated interest. If the stated rate falls below the AFR floor, the IRS treats part of the principal as disguised interest, creating original issue discount and changing the tax picture for both parties.1Office of the Law Revision Counsel. 26 USC 1274 – Determination of Issue Price in the Case of Certain Debt Instruments Issued for Property
The AFR has three tiers keyed to loan duration: short-term for three years or less, mid-term for more than three but not more than nine, and long-term beyond nine. New rates are published monthly.2Internal Revenue Service. Applicable Federal Rates AFRs Rulings Most seller-financed deals price a few points above the applicable AFR to compensate the seller for carrying private, unsecured-by-a-bank risk.
One planning point worth using: the regulations let you apply the lowest AFR published during the three months ending with the month the contract was signed, or the three months ending with the closing month, whichever produces the lower rate.3eCFR. 26 CFR 1.1274-4 – Test Rate In a declining-rate environment, that window can save a fraction of a point on a large note.
Amortization, Balloon Payments, and Prepayment
Most deals separate the amortization schedule from the loan term. A common structure amortizes payments over 10 years but requires full repayment within five. The buyer gets a manageable monthly payment; at the end of year five, the remaining principal comes due as a balloon. Anyone signing this needs a real plan for refinancing or accumulating the cash to cover that lump sum.
Prepayment is worth thinking through from the seller’s side. Early payoff cuts off interest income the seller was counting on. A prepayment penalty, usually a percentage of the outstanding balance or a set number of months of interest, is generally enforceable in commercial transactions, unlike the heavier restrictions on residential mortgages. If you include one, write the exact formula and the window during which it applies.
Collateral and Perfecting the Security Interest
The loan needs collateral behind it, and in a business sale that typically means the assets being purchased: equipment, inventory, receivables, intellectual property, and real estate if included. The security agreement has to describe the collateral specifically enough to reasonably identify each item. “All the debtor’s assets” is not sufficient under the Uniform Commercial Code.4Legal Information Institute. Uniform Commercial Code 9-108 – Sufficiency of Description Use serial numbers for major equipment, specific descriptions for intellectual property, and clear categories for revolving assets.
Having collateral and being able to enforce a claim to it are two different things. Filing a UCC-1 Financing Statement with the appropriate Secretary of State puts other creditors on notice of your security interest. Skip that filing and a later creditor can leapfrog your claim.
A trap that catches sellers: a UCC-1 lasts only five years. If the note runs longer, or if the balance is still outstanding at year five, the seller must file a continuation statement during the six months before the lapse date. Miss the window and the security interest lapses, potentially leaving the seller unsecured.5Legal Information Institute. Uniform Commercial Code 9-515 – Duration and Effectiveness of Financing Statement Effect of Lapsed Financing Statement Put the continuation deadline on a calendar the day you file the original.
Personal Guarantee
Business assets may not cover the note balance if the company falters under new ownership. A personal guarantee makes the buyer individually liable, reaching personal savings, investments, and sometimes real property.
One legal boundary matters here. If the buyer is married and the seller wants access to jointly held assets, federal law limits when a spouse’s signature can be required. Under Regulation B, which implements the Equal Credit Opportunity Act, a creditor generally cannot demand a spouse’s guarantee as a blanket requirement. A spouse’s signature can be required only when the primary borrower’s own creditworthiness is not sufficient, or when state law requires both spouses to sign to encumber jointly held real property.6Consumer Financial Protection Bureau. Comment for 1002.7 – Rules Concerning Extensions of Credit
Non-Compete and Transition
A buyer paying for a business over five or seven years needs assurance the seller won’t open a competing shop down the street. A non-compete in a seller-financed deal isn’t a nice-to-have. Without it, the seller could pocket the down payment, launch a competitor, and leave the buyer struggling on a hollowed-out business.
Non-competes in business sales are generally more enforceable than employment non-competes, but scope still matters. Limit the restriction to the same industry, tie the geography to where the business actually operates, and set a defined term. Courts weigh those three together, and overreach on any one can get the whole clause narrowed or struck. Add a non-solicitation clause to keep the seller from poaching key employees or customers.
Build in a training and transition period as well. A seller who financed the sale has every incentive to help the buyer succeed, because that’s how the note gets paid. Specifying total hours rather than a rigid schedule gives both sides flexibility. Longer consulting engagements are often handled under a separate agreement with their own compensation.
Insurance and Protective Covenants
Collateral is only worth something if it still exists. The loan agreement should require the buyer to keep property insurance on the assets securing the note, with the seller named as an additional insured or loss payee. Key-person life insurance on the buyer is common when the business depends heavily on the buyer’s personal expertise or relationships.
Financial covenants are less common in seller financing than in bank lending, but some sellers negotiate limits on additional debt, above-market owner salaries, or large distributions while the note is outstanding. Treat these as early-warning triggers. If the buyer breaches, the seller can intervene before the business deteriorates to default.
Tax Treatment
For the Seller: Installment Sale Rules
Seller financing typically qualifies for installment sale treatment, letting the seller spread capital gains recognition across the years payments are received instead of taking the entire gain in the year of sale.7Office of the Law Revision Counsel. 26 USC 453 – Installment Method Each payment is split into three pieces: return of basis, capital gain, and interest. The interest portion is ordinary income in the year received.
The exception that surprises sellers: depreciation recapture cannot be deferred. If the seller claimed depreciation on business assets, the recapture is ordinary income in the year of sale regardless of how much cash actually arrives that year.8Internal Revenue Service. Publication 537 (2025), Installment Sales A seller who depreciated $200,000 of equipment owes recapture tax on that amount up front, even if year-one payments total $50,000. Build that bill into the cash flow plan.
Not everything qualifies. Inventory and stock or securities traded on an established market are excluded, and the installment method doesn’t apply to property sold at a loss.7Office of the Law Revision Counsel. 26 USC 453 – Installment Method When a deal mixes qualifying and non-qualifying assets, the purchase price allocation between them directly changes how much gain can be deferred.
For the Buyer: Interest Deduction
The buyer can generally deduct interest on the seller note as a business expense, since the debt is allocable to the trade or business acquired. For larger businesses, the deduction is capped at business interest income plus 30% of adjusted taxable income, with disallowed interest carried forward. Smaller businesses that meet the gross receipts threshold are exempt from the cap.9Office of the Law Revision Counsel. 26 USC 163 – Interest
Default and Acceleration
Defining default and what follows is the most important protective work in the whole deal. Define default to include missed payments, breach of covenants, and material misrepresentations by the buyer. Most notes include a cure period, typically 10 to 30 days, giving the buyer a chance to fix the problem before the seller acts.
The acceleration clause is the seller’s real leverage. Once triggered, it makes the entire remaining balance due immediately instead of continuing installments. The seller goes from collecting a monthly payment to demanding the full outstanding principal. That shift is what forces a defaulting buyer to the table.
If default isn’t cured, the security interest becomes enforceable. Under the UCC, a secured party may take possession of the collateral without going to court, provided repossession happens without a breach of the peace.10Legal Information Institute. Uniform Commercial Code 9-609 – Secured Partys Right to Take Possession After Default If the buyer resists, the seller has to go through the courts.
The Documents That Have to Exist
Terms you agreed to across a table don’t matter until they’re signed. A seller-financed acquisition needs at least these instruments:
- Promissory note. The buyer’s written promise to repay, containing the principal, interest rate, payment schedule, balloon date, late fees, acceleration triggers, and prepayment terms. This is what proves the debt in court.
- Security agreement. Identifies each piece of collateral and the seller’s rights on default, including repossession. Descriptions have to satisfy UCC specificity.4Legal Information Institute. Uniform Commercial Code 9-108 – Sufficiency of Description
- UCC-1 Financing Statement. Filed with the Secretary of State to perfect the security interest and set the seller’s priority. Uses the exact legal names of debtor and secured party.
- Personal guarantee. A separate instrument creating the buyer’s individual liability beyond the business assets.
Every document should carry a successors and assigns clause so the obligations survive a later resale or the death of either party. Buyer and seller sign the note and security agreement, ideally before a notary. The UCC-1 gets filed with the state, and the seller keeps the filing confirmation as proof.
When a Bank or SBA Loan Sits Ahead of the Seller Note
If the buyer is combining bank or SBA financing with a seller note, the institutional lender will require the seller note to be subordinated. The SBA is particularly strict. Under current SBA policy, a seller note counted toward the buyer’s equity injection must go on full standby for the entire SBA loan term, typically 10 years, with no principal or interest payments during that period. The seller note also cannot exceed 50% of the required equity injection.11U.S. Small Business Administration. SBA Form 155 – Standby Creditors Agreement
Full standby is a real concession. No payments for a decade changes the economics of the deal, and sellers who accept it should price the risk accordingly through a higher rate or a higher price. A seller who won’t accept standby forces the buyer to find the equity injection elsewhere.