Seller financing in a business acquisition

Start with sources and uses

Show:

• Every dollar at close: purchase price
• Fees
• Lender costs
• Working capital
• Inventory treatment
• Debt payoff
• Buyer cash
• Senior loan
• Seller note
• Any retained rollover or earnout

A note that merely fills a price gap can leave the company without operating liquidity.

Then model cash available for debt service after taxes, maintenance capital expenditure, working-capital needs, and a credible manager or owner replacement. Test senior and seller obligations separately and together using the affordability framework.

Eight note terms that change the economics

Term	Buyer question	Risk if vague
Principal	Fixed at close or adjusted for working capital and claims?	Double counting or disputed funding
Interest	Rate, compounding, payment dates, and default rate?	Unexpected cash cost or tax treatment
Amortization	Interest-only, level payment, or sculpted?	Payments do not match business cash flow
Maturity/balloon	How will remaining principal be repaid or refinanced?	Refinancing cliff
Subordination/standby	What can be paid while senior debt exists?	Default under one or both loans
Collateral/guarantee	What security is available behind the senior lender?	False sense of recovery
Prepayment	Allowed, penalized, or restricted?	Buyer cannot simplify the capital stack
Setoff	Can valid indemnity claims reduce payments?	Buyer pays while chasing recovery separately

Illustrative financing case—not a market recommendation

A $1.20 million acquisition uses $120,000 buyer cash, a $900,000 senior loan, and a $180,000 seller note. The seller note bears 6% interest, amortizes over seven years, and matures after five. Its monthly payment is about $2,630, and the remaining balloon after 60 payments is about $59,330.

The buyer should not stop at the monthly payment. Model whether cash flow supports both loans in a downside year, whether the senior lender permits current payments, and where the $59,330 balloon comes from if refinancing is unavailable. A longer amortization lowers current payments but increases balloon exposure and the seller's time at risk.

Senior lender terms control the real payment schedule

A seller note may be subordinated in lien priority, payment priority, or both. A standby agreement can restrict principal and interest, remedies, acceleration, collateral enforcement, and amendments while senior debt is outstanding. Review the note, subordination agreement, senior loan documents, and purchase agreement as one system.

For SBA-supported financing, use the SBA's current SOP library and the participating lender's written requirements ^[5] . Do not tell a seller that the note will count as injection or receive payments until the lender approves the exact structure.

What the SBA rules require of a standby note

If the senior debt is a 7(a) loan, the seller note is not just subordinated by private agreement — it is governed by SOP 50 10 8.1, effective 1 October 2026. Four provisions matter to the seller more than to the buyer, and it is better for the buyer to raise them first than to have a lender raise them at week six.

Provision	Effect on the seller
Full standby means no principal and no interest for the term of the 7(a) loan	On a ten-year loan, a decade of no cash. Interest may accrue and be added to the standby debt, then amortise after the 7(a) loan is paid in full — so the note is not worthless, but it is very long
Standby debt is a limited equity injection source	It may supply no more than half the required injection, individually or with other limited sources. A seller note cannot replace the buyer’s whole down payment, so do not negotiate as though it can
Seller debt is eligible to be refinanced once it has been in place and current for 36 months	The earliest realistic exit. Worth stating in the term sheet, because sellers usually assume the answer is never
The provider of standby debt may not take an equity investment in the business	The carry-a-note-and-keep-a-slice structure is unavailable. It is one or the other

The standby creditor must also subordinate any lien rights in collateral to the lender’s rights and take no action against the borrower or the collateral without the lender’s consent ^[1] . A seller who expects to be able to accelerate on a missed payment should understand before signing that a full standby agreement removes that remedy for the life of the senior loan.

Use the note as security only through clear documents

A seller note can improve buyer recourse when the purchase agreement allows an established indemnity claim to offset note payments.

Define:

• Notice
• Response period
• Disputed-claim reserve
• Limits
• Senior-lender consent
• What happens at maturity

A broad unilateral setoff right may be unacceptable to the seller or lender; no setoff right may leave the buyer paying the note while litigating a breach.

Do not confuse financing with transition performance

A fixed seller note is owed even if customers leave, unless specific defenses or offsets apply. If part of the price should depend on retained revenue, collected gross profit, a license approval, or a key customer renewal, consider whether a carefully defined earnout, holdback, escrow, or contingent note component fits better. Avoid metrics the buyer can manipulate or the seller cannot verify.

Installment-sale and interest rules

IRS Publication 537 describes an installment sale as one where at least one payment is received after the tax year of sale. Each principal payment can include interest, return of basis, and gain ^[2] . Inventory gain cannot use the installment method, and the sale of an entire business is treated as separate asset sales based on the allocation rather than as one asset ^[2] .

Low or unstated interest can cause the IRS to treat part of principal as interest or original issue discount. Publication 537 uses short-term (three years or less), mid-term (over three through nine years), and long-term (over nine years) federal-rate categories ^[2] .

For July 2026, the IRS annual-compounding AFRs are 4.00% short-term, 4.35% mid-term, and 4.98% long-term ^[3] . Those rates change monthly and are tax reference points—not a conclusion that a 4.35% acquisition note is commercially fair. Check the rate for the note's month and term in the IRS AFR archive ^[4] .

Diligence the seller as a creditor relationship

• Confirm the seller has authority and capacity to lend and receive payments.
• Understand whether the seller note is assigned, transferable, or restricted.
• Coordinate security interests, UCC filings, lien releases, and senior-lender priority.
• Specify tax reporting, payment statements, late charges, and communication.
• Define defaults, cure periods, acceleration, dispute venue, and remedies.
• Model death, disability, estate transfer, buyer refinancing, and sale of the business.

What belongs in the LOI

• Approximate principal, interest approach, amortization, maturity, and payment start.
• Express subordination and standby subject to lender requirements. From 1 October 2026, SOP 50 10 8.1 defines full standby precisely for SBA change-of-ownership deals: no payments of principal or interest for the term of the 7(a) loan, documented on SBA Form 155 or the lender’s equivalent with a copy of the note attached ^[1] . Interest may accrue and be amortised after the 7(a) loan is repaid in full. See the equity injection guide for how much of an injection a standby note can actually cover.
• Collateral and guarantee expectations, subject to senior-lender priority.
• Prepayment, setoff, and indemnity interaction.
• Whether any amount is contingent and the exact performance principle.
• Tax-adviser review and consistent allocation/reporting.