How to Finance Buying an Existing Business: SBA, Seller Notes and Bank Debt

By MercFinancial · Published 2026-08-17 · Updated 2026-09-07

Business acquisition financing is usually a layered stack: an SBA 7(a) or bank loan, a seller note, and the buyer's own equity. Here is how lenders size each layer, what they underwrite, and which deal structures fail.

Business acquisition financing for an existing company is almost always a layered stack rather than a single loan. An SBA 7(a) loan or a conventional bank term loan carries most of the purchase price, the seller finances a slice through a note, and the buyer contributes equity from documented personal funds. Lenders size every layer from the target's historical cash flow, not the buyer's plans for it, and they underwrite the buyer's experience and liquidity as closely as the business itself.

This article covers each layer of that stack, what an SBA or bank underwriter examines, the documents a lender will ask for, a realistic timeline from letter of intent to closing, and the structures that reliably fail. The nuance matters because the price a seller will accept and the structure a lender will finance are not always the same number, and reconciling the two is most of the job.

"I had a signed letter of intent and a seller who liked me, and I assumed the loan was the easy part. The lender cared about things neither of us had discussed: the lease, the customer list, and how much of my own money was going in."

Why Business Acquisition Financing Is Built as a Stack

Most of what you pay for in an operating business is goodwill: customer relationships, trained staff, the brand and the cash flow they produce. Goodwill cannot be repossessed, so an acquisition lender is really lending against the business's ability to keep producing cash after the keys change hands, and it spreads that risk across several parties rather than carrying all of it.

The SBA 7(a) Loan: The Workhorse of Small Acquisitions

The SBA 7(a) program explicitly permits financing a change of ownership, which is why it funds so many Main Street purchases. The lender makes the loan and the SBA guarantees a portion of it against loss, which lets the lender finance goodwill it would never carry on its own balance sheet. Terms for the goodwill and working-capital portion run up to ten years, longer when commercial real estate is included.

The buyer must make an equity injection from a documented source; the rule on how much of it a seller note can satisfy, and on what standby terms, has been revised more than once, so verify the current standard. Anyone who will own twenty percent or more after closing signs an unlimited personal guarantee, and a seller who keeps a stake above that line guarantees too. On all but the smallest deals the lender must obtain an independent business valuation, and a valuation below the agreed price forces the structure to change.

The SBA has not allowed earn-outs, where part of the price depends on future performance, in a 7(a)-financed purchase; confirm the current rule before writing one into a letter of intent. When a building comes with the business, some lenders pair a 7(a) loan for the operating company with a 504 loan for the real estate; the two programs are compared in SBA 7(a) vs 504 loan comparison.

Seller Notes, Bank Debt and Buyer Equity

A seller note is a promissory note you sign in favor of the seller for part of the price, repaid over several years. Lenders require it to be subordinated to the senior loan and often on full standby, meaning no payments at all, for a period the lender or the SBA specifies. Sellers accept notes because they bridge the gap between the asking price and what the cash flow supports. Banks lend on acquisitions without an SBA guaranty when the target has hard assets, a long profitable history and a buyer with a strong balance sheet; terms are usually shorter and the equity expectation higher, but the process can be faster. For a goodwill-heavy service business, conventional acquisition debt is rarely available at all.

On equity, lenders want to see where the cash came from: savings, a documented gift, the sale of an asset or investor capital. Borrowed money generally does not count unless its repayment does not depend on the business, and an investor who ends up owning twenty percent or more will be asked to guarantee an SBA loan. Funding equity from a retirement account through a rollover structure is legitimate but must be set up by a specialist before closing.

What the Lender Actually Underwrites

The center of the file is the target's historical cash flow, read from three years of business tax returns and current interim statements. The underwriter rebuilds earnings by adding back the seller's compensation, discretionary expenses, depreciation and interest, then subtracts a market salary for you and the debt service on every layer of the stack. What remains is the coverage cushion, and the lender wants it comfortably above break-even.

Then the underwriter turns to you. Direct industry experience is the strongest credential; transferable management experience, a seller transition period and retained key employees are the usual substitute. Post-closing liquidity matters as much as the injection. The lender also reads the lease, whose remaining term with options should reach at least as far as the loan, and the landlord must consent to the assignment. Customer concentration, a seller non-compete and transferable licenses complete the review; the general version is described in what lenders review on a business loan.

The Due-Diligence Documents You Will Need

Business acquisition financing runs on paper from three sources, and the seller's package is the one buyers underestimate.

• From the seller: three years of business tax returns, year-end and interim financial statements, recent bank statements, receivable and payable agings, a customer list showing concentration, equipment and inventory lists, the lease, an employee census, and a schedule of existing debt and liens.
• From you: three years of personal tax returns, a personal financial statement, proof of the equity injection and its source, a resume, formation documents for the acquiring entity, and a first-year budget with projections.
• Deal documents: the letter of intent, the draft purchase agreement stating whether it is an asset or stock purchase, the proposed seller note and standby terms, the lease assignment, and the seller's transition and non-compete agreements.

The lender adds its own items: an independent valuation on most deals, an appraisal and environmental report if real estate is included, and public-records searches on the seller for liens, judgments and unpaid taxes. An old UCC financing statement nobody released is a common late surprise.

Timeline From Letter of Intent to Closing

With a complete package and a lender that closes acquisitions regularly, the sequence below commonly takes a couple of months; real estate, a low valuation or a slow seller can stretch it. Closing expectations for other products are in business funding timelines by product.

If you are between a first conversation with a seller and a signed letter of intent and want a second opinion on whether the deal will finance, the free 30-minute call with a funding specialist exists for exactly that moment; you can book it here without committing to anything.

Deal Structures That Fail Underwriting

The same structures fail at lender after lender. A price justified by projections rather than the last three years of returns will not survive the valuation. An equity injection that is too thin, or that traces back to a personal loan, stops the file. A seller note with payments starting at closing can push coverage below the lender's floor.

Unreported cash revenue is its own trap: sellers argue the business earns more than the returns show, and lenders finance only what the returns show. A lease that expires before the loan, a seller who wants to keep a large stake without guaranteeing, and a customer base dominated by one account are structural problems a lower price does not fix. If a lender has said no, the realistic next moves are in the bank-declined business loan playbook.

Where MercFinancial Fits

MercFinancial is a commercial funding brokerage in Houston, Texas. We are a broker, not a lender, and we do not promise approval or terms. On acquisitions, our value is knowing which of the SBA and conventional lenders among our 160+ wholesale lending relationships actually close purchases in your industry and at your deal size, because lender appetite is never published. A specialist can usually tell you within one conversation which of those lenders fits.

We also help you assemble the package in the form lenders underwrite from, so the seller's financials, your injection and the proposed stack arrive together. The SBA paperwork is itemized in the SBA loan requirements checklist, and the full range of programs we place is on our business funding page.

Frequently Asked Questions

Can you get an SBA loan to buy an existing business?

Yes. The SBA 7(a) program specifically allows financing a change of ownership, including the goodwill portion of the price that banks will not finance on their own. The lender underwrites the target's historical cash flow and your experience, requires a documented equity injection, and obtains an independent valuation on most deals. Each SBA lender sets its own appetite for industries and deal sizes.

How much money do you need to put down to buy a business?

SBA rules set a minimum equity injection for a change of ownership, and lenders may ask for more when cash flow is thin or the buyer's experience is limited. The minimum, and how much of it a seller note on standby can satisfy, has changed in recent rule revisions, so verify the current standard. Its source must be documented, and borrowed funds generally do not count.

Does the seller have to finance part of the purchase?

No program requires it, but lenders like to see it and many deals need it to bridge the gap between price and financeable cash flow. A seller note is subordinated to the senior loan and often placed on standby for a period, so the seller receives nothing while you stabilize the business. A seller who refuses any note may be signaling doubt about the numbers.

How long does business acquisition financing take?

With a complete package and an experienced acquisition lender, closing commonly happens within a couple of months of submission. The valuation, the seller's responsiveness, landlord consent on the lease assignment and any real estate reports are the usual sources of delay. Starting the lender conversation before the letter of intent is signed is the biggest single time-saver.

Can I buy a business in an industry I have never worked in?

Sometimes. Lenders weigh direct industry experience heavily, but transferable management experience combined with a seller transition period, retained key employees or a hired operator satisfies many of them. The more technical or licensed the business, the harder the case. Expect the lender to ask who will run the business on the first Monday after closing.

This article is for educational purposes only and is not financial advice. Loan programs, rates, and approvals vary by lender and borrower profile.