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

It’s the first question every buyer asks, and almost every answer online is wrong — not because the numbers are made up, but because they only tell you about the down payment. The down payment is the smallest part of what you actually need to close. If you walk into a deal budgeting for 10% and nothing else, you will run out of cash in your first 60 days of ownership. Let’s fix that.

The short answer

For a typical Main Street business bought with an SBA 7(a) loan, plan to have cash equal to roughly 12–18% of the purchase price on hand — not 10%. The extra covers closing costs and, more importantly, working capital for the first few months when you’re learning the business and cash is tight. On a $500,000 acquisition, that’s $60,000–$90,000, not the $50,000 most people budget.

The SBA down payment: what actually changed in 2025

The SBA 7(a) loan is how most first-time buyers finance an acquisition, and the rules got stricter. As of the June 1, 2025 update to the SBA’s operating procedures (SOP 50 10 8), buyers must inject at least 10% equity into the deal. That part hasn’t changed. What changed is how you’re allowed to count seller financing toward it.

Previously, a clever buyer could structure a seller note to cover most of the 10% and bring almost nothing to the table. That door is mostly closed. Under the new rules, a seller note only counts toward your required injection if it’s on full standby for the entire life of the loan — meaning the seller receives no principal and no interest payments for up to ten years — and even then it can cover no more than half of your injection. In practice, that means you’re bringing at least 5% of the purchase price in genuine cash, and usually the full 10%.

The five buckets your money actually goes into

Stop thinking about “the down payment” as a single number. Your cash needs split into five buckets:

• Equity injection (5–10% of purchase price). Your minimum buy-in on an SBA deal.

• Closing costs (2–5%). SBA guarantee fee, lender packaging fees, legal review, and business appraisal. These are often financed into the loan, but not always.

• Working capital (this is the one everyone forgets). Payroll, rent, and inventory don’t pause while you take over. Budget one to three months of operating expenses in reserve.

• Professional fees. A quality-of-earnings review or a due diligence audit runs a few thousand dollars — and it is the cheapest insurance you will ever buy against a bad deal.

• Your own runway. If you’re leaving a job to run this business, you still have a mortgage and groceries. Fund your personal life for six months.

What “no money down” really means

You’ve seen the pitch: buy a business with none of your own money. It’s not entirely fiction, but it’s rarer and riskier than the gurus suggest. True zero-down structures usually involve a motivated seller carrying a large note, an earn-out tied to future performance, or an equity partner who funds the injection in exchange for a slice of ownership. Each of these is real. Each also transfers risk somewhere — onto the seller, onto future cash flow, or onto your equity. The 2025 SBA standby rules make the pure seller-financed version much harder to pull off inside a bank deal. The honest version of “low money down” is this: the less cash you put in, the more of the business’s future cash flow is already spoken for, and the thinner your margin for error.

A real example

Say you’re buying a service business for $500,000 with $160,000 in seller’s discretionary earnings — a healthy 3.1x multiple. Here’s a realistic cash picture: $50,000 equity injection, roughly $15,000 in closing costs not rolled into the loan, $25,000 in working capital reserve, $4,000 for a diligence review, and six months of personal runway on top. The bank finances the other $450,000. Your loan payment runs somewhere around $5,500–$6,000 a month, comfortably covered by that $160,000 of annual earnings even after you pay yourself. The deal works — but only because you planned for all five buckets, not just the first one.

The bottom line

You need less than you think to make the down payment, and more than you think to survive ownership. The buyers who get into trouble aren’t the ones who couldn’t raise 10% — they’re the ones who raised exactly 10% and had nothing left when the first slow month hit. Budget for the whole picture, keep a reserve, and you’ll be negotiating from strength instead of desperation.

GET THE PLAYBOOK

Want the full financing playbook, including how to structure seller notes under the 2025 rules? The Silver Tsunami: The Buyer’s Guide to the Greatest Business Opportunity of Our Generation walks you through the entire arc — from finding off-market deals to structuring the offer to closing without overpaying. Written for first-time buyers who don’t want to make a $500K mistake.

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