SBA Standby Seller Note: How Much of the Down Payment a Seller Can Finance

Short answer: a seller note counts toward the SBA equity injection only if it is on full standby for the entire term of the 7(a) loan, and it can cover no more than half of the required injection. On a standard 10% injection that means the seller can carry at most 5% of total project costs and the buyer has to bring the other 5% in verified cash. Full standby means no principal and no interest paid to the seller while the SBA loan is outstanding. It does not mean the note earns nothing, and that distinction is what usually gets the seller to sign. Last updated September 2026. Educational only, not legal, tax or lending advice.

This is the term that quietly decides whether a small acquisition happens. Buyers arrive at the table having read that SBA deals need ten percent down and that the seller can carry part of it, which is true, and they build a cash plan on a version of the rule that is about half right. Then the lender explains what standby actually requires, the seller hears the word decade, and a deal that penciled fine on Sunday is dead by Thursday. The rules are short. Reading them before you negotiate is worth more than any concession you can win afterward.

What is a full standby seller note?

It is seller financing on which the seller agrees to receive nothing until the bank is paid off. SOP 50 10 8, the SBA rulebook effective 1 June 2025, defines the qualifying condition in a single parenthesis: only debt that is on full standby, meaning no payments of principal or interest for the term of the 7(a) loan, may be considered as equity for SBA purposes. There is no partial version that counts. A note that pays interest only for two years and then amortizes is a perfectly ordinary commercial instrument, but it is not equity injection and it will not help you clear the down payment test.

The paperwork is specific as well. The SOP requires that the lender use SBA Form 155, the Standby Agreement, or its own equivalent standby agreement form, and that a copy of the note be attached to the standby agreement. That equivalent-form allowance matters more than it sounds, because it means the exact document you sign will vary by bank, and the bank version is the one that governs. Read it rather than assuming it mirrors the SBA template.

The standby creditor also gives up enforcement rights for the duration. Under the SOP the standby creditor must subordinate any lien rights in collateral securing the loan to the lender rights in that collateral, and must take no action against the borrower or against any collateral securing the standby debt without the lender consent. A seller signing this is agreeing not only to wait, but to sit still if the buyer stumbles.

How much of the down payment can a seller note cover?

Half of the required injection, and no more. SOP 50 10 8 states that on a change of ownership resulting in a new owner, SBA requires an equity injection of at least 10 percent of total project costs, and that seller debt may not be considered part of that injection unless it is on full standby for the life of the SBA loan and does not exceed half of the SBA required injection.

One detail in that first row costs buyers real money and almost never appears in a summary. The base is total project costs, which the SOP defines as all costs required to complete the change of ownership, regardless of the source of funds, except for lines of credit and 504 loans. That is not the purchase price. It includes financed working capital, closing costs, the guaranty fee, the valuation and the legal work. On a business bought for $1,000,000 with $120,000 of working capital and $40,000 of closing costs, total project cost is $1,160,000, the injection is $116,000 rather than $100,000, and the seller note ceiling is $58,000 rather than $50,000. That is our arithmetic applied to the SOP definition, not a figure SBA publishes, but the definition is unambiguous and lenders apply it this way.

Does a standby seller note earn any interest?

Yes, and this is the single most useful sentence in the whole section. The SOP states that the standby debt may accrue interest, and that the accrued interest may be added to the standby debt and amortized after the 7(a) loan is paid in full. Full standby suspends payment, not accrual. A seller carrying $58,000 at 8% for ten years is not making a gift of $58,000. They are making a loan whose entire return arrives at the back end, compounding into principal in the meantime.

Sellers who understand that negotiate the rate instead of refusing the structure, and they should negotiate hard. A full standby note is unsecured in practice, junior in every respect, unenforceable without the bank consent, and repaid only after a ten year bank loan retires. Pricing it like a normal five year seller note is a mistake in the seller favor of nobody. The federal minimum is the applicable federal rate, and the mechanics of setting a defensible number are covered in what interest rate to charge on a seller note. A seller taking materially more risk than the bank should not be charging materially less than the bank.

What else counts as an SBA equity injection?

The SOP lists the qualifying sources, and the exclusions are as instructive as the inclusions.

Two of those deserve a sentence each. A buyer may borrow their injection personally, from a home equity line or a relative, as long as repayment can be demonstrated to come from a source other than the cash flow of the business, and the SOP closes the obvious loophole by adding that the salary paid to the owner by the business does not qualify. So a borrowed injection works for someone with a spouse still earning, and does not work for someone quitting their job to run the business full time. That is a large practical difference between two buyers who look identical on a term sheet.

The last row is a trap worth avoiding. If you are injecting equipment or other fixed assets rather than cash, and their value exceeds net book value, you need an independent third party appraisal, and the SOP says plainly that a valuation of those fixed assets provided as part of a business valuation will not meet the requirement. The business appraisal your lender is already ordering does not do double duty here. It is a separate engagement and a separate invoice.

Why do lenders push back on seller notes that are not on standby?

Because a non-standby seller note is not free money to the deal, it is a second debt service line competing with the bank for the same cash flow. A seller note that amortizes alongside the SBA loan reduces the coverage available to the bank, and coverage is what the credit decision turns on. This is why a structure the buyer thinks of as generous, a seller carrying twenty percent on a five year amortizing note, can make a file harder to approve rather than easier.

Nothing stops you from doing both. A seller can carry 5% on full standby to satisfy the injection and separately carry another slice on ordinary amortizing terms as part of the purchase price, provided the file still services. The standby portion is the only part that counts as equity, and the rest is simply subordinated debt the lender must be willing to live with. Set the two out as separate instruments in the purchase agreement rather than as one note with mixed terms, because the standby agreement attaches to a specific note and a hybrid document invites an argument at closing.

Can a seller note replace an earnout on an SBA deal?

It has to, because the alternative is not available. SOP 50 10 8 states flatly that seller earnouts are prohibited, and then permits the mirror image in the same sentence: buyer rebates based on business performance are allowed, because a rebate benefits the borrower. If the deal you negotiated pays the seller more when the business performs, that structure is not fundable. If it pays the buyer back when the business misses, it is.

In practice most deals bridge the disagreement with a seller note instead, sized so that the seller has a reason to make the handover work. The trade-offs between notes, rebates and holdbacks, and the language that makes each of them collectible, are set out in earnout agreements, seller notes and working capital adjustments.

What changes on 1 October 2026?

SOP 50 10 8.1 replaces SOP 50 10 8 for every application issued an SBA loan number on or after 1 October 2026. SBA announced it in Information Notice 5000-880695, published 14 August 2026, and stated that change of ownership lending updates now sit in a new Appendix 15. The trigger is the loan number, not the date you signed the letter of intent and not the date the file was submitted, which is a distinction worth confirming with your lender in writing if your deal is anywhere near the boundary. Several lender advisories have described further changes to valuation and diligence requirements under the new SOP. We have not been able to verify those against the SOP text itself, and the reason why, along with the full set of current change of ownership rules quoted from the source, is on SBA SOP 50 10 8 and the business acquisition loan requirements.

What to do before you agree a standby note

Four things, in order. Ask the lender for their standby agreement form early, because it is theirs rather than SBA Form 155 in most cases and the differences are real. Compute the injection off total project costs rather than off the purchase price, so the seller note ceiling you quote to the seller is the true one. Price the standby note as the deeply subordinated ten year instrument it is, with accrual explicitly permitted and documented, rather than as a normal seller note with the payments switched off. And get the seller financials into a form a credit committee can read before you apply, because a file that arrives with three years of clean statements moves at a completely different speed from one that arrives as a bookkeeping export, and turning that export into statements a lender will actually accept is a weekend of work rather than a month.

The buyers who lose these deals are rarely the ones who could not raise the money. They are the ones who told a seller in week two that the seller could carry the whole down payment, and had to walk it back in week nine. Get the number right the first time and the conversation stays about the business. For the wider process, from letter of intent through the valuation and the site visit the SOP requires, start with how an SBA loan to buy a business actually works.

Sources read firsthand on 10 September 2026: SOP 50 10 8, Lender and Development Company Loan Programs, effective 1 June 2025, Section B, Chapter 1, for the equity injection, standby, source of injection and change of ownership provisions; SBA Information Notice 5000-866746 for the SOP 50 10 8 effective date; and SBA Information Notice 5000-880695, published 14 August 2026, for the SOP 50 10 8.1 effective date and Appendix 15. Dollar examples are our arithmetic applied to the SOP definition of total project costs and are not figures SBA publishes. Nothing here is legal, tax or lending advice.