Short answer: Seller financing is a loan you make to your buyer — they pay part of the price at closing and owe you the rest over time, with interest, under a promissory note. In lower-middle-market deals a seller note typically covers 10–30% of the price over three to seven years. Unlike an earnout, it's debt: owed in a bad year as well as a good one. The three traps are an unsecured note, a lender standby clause you didn't negotiate, and a buyer who can't actually operate the business.

The first time a buyer asks you to finance part of your own sale, it lands wrong. You're selling the business to stop carrying it. Now the buyer wants the keys today and proposes to pay you the rest over five years — while you take the risk that they run into a wall before the last check clears.

The instinct to say no is healthy. But a seller note is one of the most common structures in small business sales, and in plenty of deals it's the reason the deal happens at all. It's worth understanding properly before you reject it or sign it.

What a seller note actually is

You agree on a price. The buyer pays part at closing and owes you the rest over time, with interest, under a promissory note. In businesses our size, a seller note usually covers 10–30% of the price and runs three to seven years. You are, for that period, the bank.

It exists because the money has to come from somewhere. A buyer funds a purchase from four places: their own cash, a lender, outside investors, or you. Lenders want hard collateral, and most good small businesses aren't made of hard collateral — they're made of relationships, reputation, and cash flow. A bank won't lend fully against those. So either the seller bridges the gap or the deal dies at the financing stage. This isn't a buyer being cheap; it's arithmetic.

It is not an earnout, and the difference matters

Sellers conflate the two constantly, and it costs them. An earnout is contingent — if the business misses its milestones, you may get nothing, and that's the deal working as designed. A seller note is debt. It's owed whether the business has a great year or a terrible one. If the buyer stops paying, you have a creditor's rights, not a disappointment.

"We'll move that $800K from the note into an earnout" is not a lateral move. It's a discount.

That makes a note meaningfully safer than an earnout of the same size. It also means you should never let a buyer swap one for the other without repricing.

Why you might actually want one

Carrying paper widens your buyer pool, and a wider pool usually means a better price and a better home for the business. Cash-at-close-only buyers are a small group, and they tend to be the ones borrowing heavily to do it — which is its own risk to your team.

The interest is real money, too. Over several years, a note at a fair rate is a return on capital you'd otherwise have to go find somewhere else.

And there's a timing angle: spreading payments across years can change how the gain is treated. I'm not your CPA, and this one genuinely turns on your situation — but ask yours before you assume all-cash is automatically better after tax.

The three traps

Trap one: the unsecured note. If your note isn't secured and the business fails, you're standing behind the bank holding a piece of paper. Get collateral, get a personal guarantee where you can, and get the right to step back in if payments stop. A note without teeth is a wish with an interest rate.

Trap two: the standby clause nobody read to you. If a lender is in the deal, they'll want to sit ahead of you — sometimes with a standby period where you receive nothing at all for the first couple of years. That may be perfectly acceptable. But it should be a decision you made, not a paragraph you discovered later.

Trap three: the buyer who can't operate. Your note is only as good as the buyer's ability to run the thing. So underwrite them the way a bank would underwrite you. Have they done this before? Where does the cash come from if the first year is soft? A buyer who's offended by those questions has answered them.

One more worth naming: watch the ratio. If a headline price is 60% seller note, that headline is fiction. The real offer is what's at closing, plus a bet on a stranger.

How we think about it at NeoNox

We buy to hold. We've owned businesses since 2011 and haven't sold one, which changes what a seller note means on our side of the table: it's serviced by the same cash flow we're depending on for the next decade. We're not looking to survive your note until a flip.

Our base rate runs 2–4× EBITDA, adjusted for the norms of your industry — a distribution business and a services business don't land in the same place, and any buyer quoting you a bare multiple before understanding your industry is guessing. Our fees only start on performance triggers, they're hard-capped, and half of what you pay comes back to you as a credit at exit.

And if you'd rather not lend at all, our tiered model is another way to bridge the same gap. You can sell 10% or 100% — five tiers, your choice — so the option isn't only "all of it now, financed by you." Sometimes the cleanest answer to "will you carry paper?" is "no, but I'll keep 30% instead." We buy quietly, and your name stays on the door either way.

The bottom line

Seller financing isn't a favor you're doing the buyer or a trick being played on you. It's a loan you're making — with an interest rate, a borrower, and collateral, or it shouldn't exist. Price it, secure it, and diligence the person on the other end of it as carefully as they're diligencing you.

If you'd like a clear-eyed read on what your business is worth and which structures actually fit it, our free first-tier assessment is a no-pressure place to start.