How Much Money Do You Need to Buy a Small Business?

How much money do you need to buy a business? With an SBA 7(a) loan, the real floor is about 10% of the total deal cost in cash, not just the purchase price. Half of that 10% can come from a seller note sitting on standby. The other half has to be money you actually have. On a $500,000 deal, that works out to somewhere between $25,000 and $50,000 of your own cash, before you've even budgeted for working capital. That number, not the price on the listing, is the one that decides whether you can actually close.

The purchase price is not the number you need in the bank

Most first-time buyers do the math backwards. They see a $600,000 listing, assume they need something close to $600,000, and either give up before they start or go looking for a "no money down" deal that doesn't really exist anymore. A few years ago, some lenders would stretch a deal to 100% financing with no buyer equity at all. That's gone. Under the SBA's current lending rules (SOP 50 10 8, in effect since June 2025), a buyer needs at least 10% equity injection on an acquisition loan, full stop. That 10% is calculated against the total project cost, which is a bigger number than the purchase price alone.

Total project cost includes the purchase price, closing costs, and any working capital or equipment money rolled into the loan. A $500,000 purchase price with $40,000 of closing costs and working capital folded in is really a $540,000 total project cost. Your 10% is $54,000, not $50,000. Small gap on paper. Real money when you're the one wiring it.

A seller note covers half, never all, of your equity injection

Here's the part that trips people up. Yes, a seller can carry a note for part of your required cash. No, they can't carry all of it. Under the current rules, a seller note counts toward your equity injection only if it sits on full standby, meaning no payments of principal or interest to the seller until the SBA loan is paid off, and it can only cover half of the required 10%. The other half has to be your own unborrowed cash, sitting in your account before you sign anything.

That means on any deal, your real floor is 5% of total project cost in cash you already have, assuming a seller willing to carry the maximum standby note. If the seller won't carry a note at all, which happens more often than buyers expect once they actually ask, your floor doubles to the full 10%.

There is no version of this where the seller funds your entire down payment and you show up with nothing. Half of it has to be yours.

Three deals, worked end to end

Numbers mean more with a real deal size attached. Here's what the cash requirement actually looks like at three points on the trades business spectrum.

A $300,000 one-truck plumbing or HVAC outfit

Total project cost lands around $330,000 once closing costs and a working capital cushion are folded in. A 10% equity injection is $33,000. With the seller carrying the maximum standby note, your cash is $16,500. With no seller note at all, you need the full $33,000 yourself. Add working capital on top of that, more on that below, and you're realistically funding this deal with somewhere between $30,000 and $55,000 of your own money.

A $750,000 three-truck HVAC company

Total project cost here is closer to $820,000. A 10% equity injection is about $82,000. The maximum seller note covers $41,000 of that, leaving $41,000 as your cash floor. Without a note, you're funding the full $82,000 out of pocket. Working capital runs higher on a business this size too, so plan on a realistic range of $75,000 to $130,000 all in.

A $1,500,000 multi-crew electrical contractor

Total project cost at this size runs around $1.65 million. A 10% equity injection is $165,000. Half from a seller note gets your cash floor down to roughly $82,000. Without one, you're putting up the full $165,000. Working capital for a business running several crews climbs with it, so the honest range is $140,000 to $255,000 of your own cash before you sign.

The shape of it never changes, only the size of the number. Roughly 5% to 10% of total project cost in cash, plus working capital, plus whatever cushion you want for the first few months while the business is paying you back slower than you'd like.

Where the cash actually comes from

Nobody hands you a rulebook for this part, so here's where buyers actually find it, in roughly the order lenders find most comfortable:

• Personal savings. The cleanest source, and the one lenders like best because there's no question about where it came from or who else has a claim on it.
• A ROBS rollover from a 401(k) or IRA. Rollover as Business Startup structures let you use retirement funds to buy equity in the business without the usual early-withdrawal tax hit. It's a real option, but it needs its own specialist to set up correctly and carries real risk if the business doesn't work out, because that money was supposed to be your retirement.
• Home equity. A HELOC against a paid-down mortgage is common, but it stacks personal risk on top of business risk. If the deal goes bad, you're not just out the business, you're also carrying debt against your house.
• Friends, family or a small group of minority investors. Workable, but lenders will want it documented clearly as equity, not a side loan with its own repayment schedule competing with the SBA debt.

Most buyers end up combining two or three of these rather than relying on one. A clean story about where your half of the equity injection came from moves underwriting faster than almost anything else in the file.

Working capital: the cost nobody puts on the closing statement

This is the one that catches buyers who did the equity injection math perfectly and then ran out of cash in month three anyway. Payroll runs weekly or biweekly. Invoices from a trades business routinely get paid net 30 or net 60. That gap doesn't close itself just because you now own the company, and the SBA loan's own working capital line often undersells how tight that gap actually runs in the first quarter after close.

I've felt this gap from the other side, running subcontractors on a job before the client's invoice ever cleared. The work gets done, the subs still expect paying on their schedule, and the client's payment terms don't care about your cash position. Buying a business doesn't remove that gap. It just moves it onto a bigger number, with your own money sitting behind it.

Before you close, pull the seller's actual accounts receivable aging and payroll calendar and run the gap yourself, don't take their word for how tight it runs. A reasonable starting cushion is two to three months of fixed costs, payroll, rent, fleet payments, held separately from your equity injection and not touched at the closing table. Our due diligence checklist covers exactly what to pull from the books before you wire anything.

What pushes this number up or down

• Your credit score and relevant experience. SBA lenders generally want to see strong personal credit, usually in the high 600s or better, and some background in the trade or in running a team. Weak credit or no relevant experience usually means a lender asks for more cash, not less, or brings in a co-signer.
• Whether the seller will carry paper at all. A seller who believes the business will keep performing is willing to carry a standby note. A seller who wants to walk away clean on day one isn't, and that alone can double your required cash.
• How clean the seller's books are. Messy records make lenders nervous and slow down underwriting, which can push them toward a larger buyer contribution to offset the risk. Our guide to red flags when buying a business covers the deal issues that show up here first.
• How tight your own buffer runs. Nothing in the SBA minimum accounts for your own life. If closing wipes out your entire savings, you have no room for a slow month, a broken truck, or a tech who walks in week two.

IBBA and M&A Source's Market Pulse survey work puts seller financing at roughly 10% to 16% of total deal value on a typical Main Street transaction, dropping closer to 5% as deal size climbs past the lower middle market. That's a wider slice than the SBA standby note alone, which tells you something useful: sellers carrying paper is normal practice across this market, not a favor you're asking for.

Buying versus starting from scratch, in cash terms

If $30,000 to $50,000 in ready cash feels out of reach right now, that doesn't rule out buying forever. It usually means a smaller first deal, a seller willing to carry more of the note, or more time spent saving before you go looking seriously. Our full breakdown of buying a business versus starting one from scratch covers the other side of this tradeoff: starting from zero costs far less cash up front, but you pay for that in a year or two of unpaid time while you build a customer list and a crew from nothing. Buying costs real money now. Starting costs real time later. Know which one you can actually afford before you pick.

The bottom line

Stop sizing a deal off the purchase price alone. The number that actually decides whether you can buy a business is roughly 5% to 10% of the total project cost in cash you already have, depending on whether the seller will carry a standby note, plus enough working capital to cover payroll before the invoices catch up. On a typical $500,000 trades business, that's $25,000 to $50,000 in equity plus a working capital cushion, not $500,000. Run that math against a real deal before you assume you're priced out. Our complete guide to buying a blue collar business walks through sourcing, financing and diligence from here, or go see what the real numbers look like on live listings right now.