How to Finance a Business Acquisition: Every Option, Ranked

You finance a business acquisition the same way most of them actually close: you stack a few sources instead of trying to find one. The typical deal isn't "a buyer with a giant pile of cash." It's roughly 10% of your own money, an SBA 7(a) business acquisition loan covering the bulk of the price, and a seller note bridging the gap. That's the workhorse structure. Everything else in this post is either a cheaper piece you bolt onto it, or a more expensive piece you reach for only when the cheap ones run out.

Here's the thing most first-time buyers get wrong about a business acquisition loan: they treat financing like one decision — pick the loan, get approved, done. It's not one decision. It's a stack. And the stack has an order, because the sources aren't interchangeable. Some are cheap and hard to get. Some are easy to get and will eat you alive. The whole game is filling the price from the cheapest, most accessible money down — and stopping before you reach the stuff that's priced for desperation.

So let's rank the whole stack, cheapest and most accessible first.

1. SBA 7(a) — the workhorse, and where 90% of deals start

For buying a small business in the U.S., the SBA 7(a) is the default tool, and it's not close. The reason is simple: the SBA guarantees a chunk of the loan to the bank, so the bank will lend against the business's cash flow — not just hard assets it can repossess. That's the whole unlock. A normal bank won't hand you $800,000 to buy a plumbing company whose main asset is a customer list. An SBA lender will, because the government backs most of the loss if it goes bad.

The mechanics, current as of the June 1, 2025 rulebook (the SOP 50 10 8):

• Loan cap: $5,000,000 per 7(a) loan — and as of July 4, 2026 the SBA doubled the cumulative cap to $10 million, so a larger deal can stack a 7(a) and a 504 for up to $10M of SBA-backed financing. Almost every owner-operator deal still fits under the 7(a) limit alone.
• Down payment: 10% of total project cost. Not just the purchase price — closing costs, working capital, fees, all of it. And of that 10%, at least half (~5% of project cost) has to be your real, non-borrowed cash. The COVID-era zero-down structures are gone.
• SBA guaranty to the lender: 85% of the first $150,000, 75% above that.
• Terms: up to 10 years with no real estate, up to 25 years with real estate. No balloon. The loan fully amortizes.

What does it cost? SBA 7(a) rates are capped — they're a base rate (usually Prime) plus a maximum lender spread. The spread caps run roughly Prime + 3% on larger loans up to Prime + 6.5% on small ones, which in the current rate environment puts most 7(a) acquisition loans somewhere in the ~10.5% to 14.75% range. That sounds high next to a mortgage, but you're borrowing against goodwill and cash flow, not a house — and the long amortization keeps the monthly payment low enough that the business can carry it.

That last part is the actual test. The deal lives or dies on DSCR — debt service coverage ratio, the business's cash flow divided by the loan payment. The SBA's regulatory floor is 1.15x on a standard 7(a) (1.10x on small loans under $350,000) — and your market-rate owner salary gets subtracted before that number is calculated. If the only way the math works is you taking $0 in salary, the deal doesn't actually cash-flow. I broke the full 2026 rulebook down in the SBA loan requirements post, including the 1.25x "requirement" that isn't actually an SBA rule. Read it — then run your own deal's numbers — before you talk to a lender.

SBA money is cheap relative to everything below it on this list, and accessible if the business has clean books and real cash flow. That's why it anchors the stack. But it almost never covers 100% of the price — which is exactly why the next piece exists.

2. Seller financing — the piece that makes the SBA deal close

A seller note is the seller agreeing to be your bank for part of the price. You pay them back over time, with interest, instead of handing over the full amount at close. Roughly half of small-business sales include some form of it, and it's the most common companion to an SBA loan for a reason.

Here's why it's so valuable, and where the 2025 rules bit. Under the new SOP, a seller note can count toward your equity injection — it can cover up to ~5% of project cost of your required 10% down — but only if it's on full standby for the entire life of the loan. Full standby means the seller collects nothing, no principal and no interest, for the whole term. The old trick where the seller started collecting interest after 24 months? Deleted. So the seller-note-as-down-payment move still works, but the seller has to be willing to wait years to see a dollar of it.

Outside of the equity-injection rule, a seller note does two other things that matter more than the money. First, it lowers how much you have to borrow from the bank, which directly helps your DSCR. Second — and this is the part buyers underrate — a seller who finances part of the price is a seller who's betting on the business after you take over. If they won't carry a note, ask yourself why. The full mechanics, including how the standby rule reshaped these deals, are in the seller financing post.

One trap: don't let a seller note drift into an earnout — where part of the price gets paid later based on how the business performs. Earnouts are banned on SBA 7(a) deals. A note is a fixed debt on a schedule; an earnout makes the price itself a moving target, and the SBA won't underwrite it. Easy line to cross in conversation, hard to uncross in underwriting.

3. Conventional bank acquisition loans — when you don't need the SBA

A conventional bank acquisition loan is the same idea as the SBA loan minus the government guarantee. The bank lends, you pay it back, nobody backstops the loss. Which means the bank is far pickier about who it'll do this for.

The honest version: conventional acquisition loans usually go to buyers who already have a strong balance sheet, an existing banking relationship, or a target with hard assets the bank can secure against. For a first-time buyer purchasing a service business with little collateral, the bank's answer is often "come back with an SBA wrap." When it does work, the upside over SBA is real — potentially a lower rate, no SBA guaranty fee, faster close, less paperwork, and no 10%-with-5%-real-cash injection rule dictating your structure.

So conventional ranks below SBA here not because it's worse money — it can be cheaper — but because it's less accessible to the typical small-business buyer. If a bank will do your deal conventionally on good terms, take it. Most buyers under the $5M mark won't get that offer, which is the whole reason the SBA program exists.

4. ROBS — your own 401(k), and a real warning

ROBS — Rollover as Business Startup — lets you fund a business purchase with your retirement savings without the early-withdrawal penalty or the immediate tax hit. The structure is specific: you form a C corporation, that corp sponsors a new 401(k) plan, you roll your existing retirement funds into that plan, and the plan buys stock in your own company. The money moves from your 401(k) into the business, tax-deferred, in exchange for shares.

Where it fits in the stack: ROBS is one of the few ways your equity injection can come from non-borrowed funds without you liquidating a brokerage account and eating the penalty. Setup runs about $5,000 up front plus ~$100–$150/month in ongoing plan administration, and it has to be executed exactly right or the IRS treats it as a taxable distribution.

Now the part I won't sugarcoat. The IRS ran a compliance review of ROBS arrangements and found that most of the businesses in their sample failed or were heading toward failure — bankruptcies, liens, and people who lost not just the business but the retirement savings they'd spent decades building. ROBS isn't free money. It's you putting your retirement on the same square as the business. It can be a smart, penalty-free way to fund your down payment if you've already underwritten the deal cold — and it's a catastrophe if you're using it to buy your way into something you couldn't otherwise afford. Use it to deploy capital you'd already decided to risk, not to manufacture capital you don't have.

5. Investor equity and search-fund capital — when the deal is bigger than you

Everything above is debt — you keep 100% of the business and owe money. Equity is the opposite: investors put in cash, and they own a slice of the company alongside you. You give up ownership and upside; in exchange you can do a deal far larger than your own capital allows, and you're not personally on the hook for that piece the way you are with a loan.

The structured version of this is the search fund, the standard vehicle in entrepreneurship-through-acquisition (ETA). Investors fund your search — typically $300,000–$500,000 to cover your salary and deal costs while you hunt — then participate in the acquisition itself. The trade is ownership: per Stanford's search fund research, the median searcher holds around 25% of the equity at acquisition, with the ability to earn up to ~30–35% through time- and performance-vesting if the company hits its milestones. Investors hold the rest. I wrote a full primer in the search fund post.

This ranks below the debt options not because it's bad — for the right buyer chasing a $2M+ deal it's the only way the math works — but because it's the least accessible. Raising a search fund means convincing experienced investors to back you, which is a different and harder job than convincing a bank that a business cash-flows. If you can buy the business with SBA money and keep all of it, you usually should. Equity is what you reach for when the deal is too big to finance with debt alone, or when you want partners who've done this before sitting at your table.

6. Mezzanine and unsecured debt — the last resort, priced like one

Mezzanine debt fills the gap between your senior loan (the SBA or bank money) and your equity, usually secured against your ownership stake rather than hard assets — because the assets are already pledged to the senior lender. It exists for one reason: to let you do a deal where the cheap money and your own cash don't quite reach the purchase price.

And it's expensive. Mezzanine financing typically carries interest in the 12–20% range, sometimes higher, often with PIK interest (it compounds onto the principal instead of being paid in cash) plus origination and monitoring fees on top. Generic unsecured business loans aren't much friendlier. This is the most expensive money on the list by a wide margin, and that price isn't an accident — it's pricing the fact that this lender gets paid last if things go sideways.

Here's the honest read: if your deal only closes because you bolted on mezzanine debt at 18%, that's usually the deal telling you the price is too high or your equity is too thin. Sometimes the math genuinely works and the extra cost is worth controlling a great business — fine. But for a first-time small-business buyer, reaching this rung is more often a sign to renegotiate the price than a sign to find more expensive money. The cheap stuff didn't reach for a reason.

The actual structure most deals use

Strip away the menu and here's what the typical small-business acquisition actually looks like — say, the median business that sold in 2025 for around $350,000 at ~2.6x SDE:

• ~10% buyer equity — your real cash (or a penalty-free ROBS rollover), with at least half of it non-borrowed per the SBA rule.
• The bulk via an SBA 7(a) loan — the workhorse, amortized over 10 years so the business can carry the payment.
• A seller note bridging the rest — on full standby if it's counting toward your down payment, which lowers your bank borrowing and keeps the seller invested in your success.

Equity, mezzanine, and conventional loans are the variations on that spine, not replacements for it. Most buyers reading this will finance their first deal with exactly those three pieces — own money, SBA, seller note — and never touch the bottom half of the list. That's the point of ranking it: fill the price from the cheap, accessible money down, and stop early.

Where DealStratum fits — and where it doesn't

I want to be clear about this part, because the financing world is full of people who'll blur the line. DealStratum is not a lender. We don't fund your deal, we don't broker your loan, and we don't underwrite your DSCR. What we do is the step that comes before any of this matters: finding the right business and running the math on whether it can carry a loan in the first place.

DealStratum is the sourcing engine and acquisition CRM — it pulls on-market listings from across the sources we track into one deduped feed you can filter to your buy box, helps you reach off-market owners, and screens a deal's numbers so you walk into the lender conversation already knowing whether the cash flow covers the debt after your salary. The financing stack above is the conversation you have after you've found a deal worth financing — with a real CPA, a real attorney, and a real SBA Preferred Lender in the room. We just make sure the deal you bring them is one worth their time.

Most first-time buyers freeze on financing because they think they need one giant source of money they don't have. They don't. They need to stack a few — their own ~10%, an SBA loan, a seller note — and the math works out more often than the fear suggests. I'm just trying to give you the version of the stack that's honest about what each piece costs, so you fill the price from the cheap money down and never overpay for the expensive stuff at the bottom. Financing is just one piece of the larger picture — the full walkthrough of buying a business puts it in context with finding, valuing, and closing the deal.

Nothing here is legal or financial advice — it's general information; talk to a qualified attorney, CPA, and SBA lender about your specific deal.

Sources

• SBA — SOP 50 10 8 (7(a) program rules, effective June 1, 2025)
• SBA — cumulative 7(a)+504 loan cap doubled to $10M (effective July 4, 2026)
• NerdWallet — current SBA 7(a) interest rates and spread caps
• IRS — Rollovers as Business Start-Ups (ROBS) compliance project
• NerdWallet — ROBS setup costs and ongoing fees
• Carta — how a search fund works (search-phase capital)
• Stanford GSB — Search Fund Study (searcher equity / returns)
• SoFi — mezzanine financing guide (rates and structure)
• BizBuySell Insight Report (median sale price and multiple)