How Does Business Acquisition Financing Work? SBA 7(a), 504, and the Equity Injection

Business acquisition financing is the mix of debt, seller financing, and buyer cash used to pay for an existing company. Most lower middle-market deals do not get funded with a single check. They get funded with a stack, and each layer carries its own rules.

As of 2026, the most common way to finance a business acquisition in the $0 to $5M-6M range (commonly called the Main Street Market) is an SBA 7(a) loan, often paired with a seller note and a cash down payment from the buyer. The rules on that down payment changed on June 1, 2025, and a lot of the checklists floating around online are now out of date. If you are early in the process of buying a business, it pays to understand the pieces before you ever sit down with a lender, or discuss an offer structure with a seller.

What is business acquisition financing?

Business acquisition financing is the capital structure a buyer assembles to purchase a company, usually combining a senior loan, seller financing, and the buyer’s own equity. On larger deals, outside investor capital can fill part of the gap.

The reason it works as a stack is risk. A bank rarely wants to fund the entire purchase price, and a buyer rarely holds the full amount in cash. So the price gets split across sources, each with different terms, different security, and a different position if the business hits a rough patch. A typical deal in the main street market looks like a senior loan covering the bulk of the price (usually 70% to as much as 90% with SBA), a seller note covering a slice, and a cash injection from the buyer covering the rest.

How to finance a business acquisition: the four common sources

There are four sources that show up in most acquisition funding structures.

• Buyer equity. The cash you put in. Lenders call this the equity injection, and it is the piece that changed in 2025.
• Senior debt. The largest layer, usually an SBA 7(a) loan or a conventional bank loan. It sits first in line to be repaid.
• Seller financing. A note the seller carries for part of the price, repaid over time. Seller notes are common in this market and often make the difference between a deal that closes and one that stalls.
• Investor capital. On larger deals, outside equity from a partner or fund that takes a stake in exchange for putting money in.

Most buyers use some combination of the first three. The exact split depends on the price, the cash flow of the business, and what the lender will support.

How the SBA 7(a) loan works for buying a business

The SBA 7(a) loan is the most common business acquisition loan in the Main Street Market, because it can finance goodwill. Goodwill is the intangible value of a business, the part of the price that is not real estate, equipment, or inventory. In most acquisitions, goodwill is the majority of what you are paying for, and the 7(a) is one of the few programs that will lend against it.

A 7(a) can fund the business purchase, working capital, and in some cases the real estate, all in one loan. Terms typically run up to 10 years for a business acquisition, longer when real estate is part of the deal. The loan itself is made by a bank or a non-bank lender, with the SBA guaranteeing a portion of it. That guarantee is what lets lenders approve deals a conventional bank would walk away from. The full program details live on the SBA’s 7(a) loan page.

When the SBA 504 loan fits a business acquisition

The SBA 504 loan is built for fixed assets, not for buying a business outright. It finances owner-occupied commercial real estate and long-life equipment, and it cannot fund goodwill, inventory, or working capital. That single limitation is why the 504 is rarely the whole answer for an acquisition.

The SBA recently made the 504 a bit more attractive as an acquisition tool.  The SBA program has limits on how much one can borrow—in 7a it’s based on the whole loan amount, and in 504 its the Certified Development Company portion (more on that below). Prior to July 1, 2026, those limits were considered jointly across the 7a and 504 platforms.  Now, the SBA has decoupled the 7a and 504 limits, allowing a more strategic assessment of which loan, or combination of loans, is best for each deal.

The 504 uses a three-part structure often described as 50/40/10. A conventional bank funds 50% in first position, a Certified Development Company backed by the SBA funds 40%, and the buyer puts in 10%. The CDC portion carries a long-term fixed rate, which is the main reason buyers reach for it.

Where the 504 earns its place is a deal that includes a building–such as a retail store, or a manufacturing plant. A buyer purchasing a company and the real estate it operates from can pair a 504 for the property with a 7(a) for the business itself. Spending 7(a) room on the building uses up capacity you would rather save for goodwill and working capital (or future acquisitions), so splitting the two can leave you in a stronger position. You can review the rules on the SBA’s 504 loan page.

Here is how the two programs compare for a buyer.

The equity injection: how much cash does a buyer need?

As of June 1, 2025, an SBA 7(a) loan for a change of ownership requires a minimum equity injection of 10% of total project cost. Total project cost means everything required to complete the purchase, not just the headline price of the business. The rule comes from the SBA’s updated operating procedure, SOP 50 10 8, which brought back underwriting standards the agency had eased earlier in the decade.

Here is what that looks like in practice. On a $1 million acquisition, the buyer needs at least $100,000 of qualifying equity to close. Put plainly, the brief window of zero-down SBA acquisitions has closed.

A seller note can count toward part of that 10%, but only under a strict condition. The note has to sit on full standby for the entire term of the SBA loan, which means the seller collects no principal and no interest during that period. A seller note can cover up to half of the required injection, leaving the buyer to bring the rest in cash. The deal also has to close in a single step. Phased or incremental buyouts no longer qualify.

One more point worth knowing. The 10% is a floor, not a ceiling. Lenders can and do require more when the business carries heavy goodwill, a short operating history, or a buyer who is new to the industry.

What lenders look at before they fund a deal

Lenders size business acquisition financing off two things: the cash flow of the business and what it is worth. A company that throws off steady, verifiable earnings supports more debt than one with lumpy or owner-dependent income. That is why the quality of those earnings gets as much scrutiny as the headline price.

Value matters because the loan is secured against the business and its assets. Anything that quietly caps the valuation also caps how much a lender will advance against the deal. A handful of risks tend to do exactly that, and they are easy to miss until a lender or an advisor surfaces them. Two of the most common ones are covered in our post “these risks that cap a business valuation”, and both are worth understanding before you borrow against a purchase.

Financing a business acquisition is rarely about finding one lender. It is about structuring the layers so the deal works after you own it, not just on paper.

Thinking about financing a deal? If it would help to talk through your options, let’s connect.