The Capital Stack in a Lower Middle Market Acquisition: How Deals Actually Get Financed
When a buyer offers you $12M for your business, the most important question is not whether $12M is a fair price. The most important question is: where is the $12M coming from?
A buyer paying $12M in cash from their balance sheet is a fundamentally different counterpart than a buyer who needs to assemble $12M from a bank loan, a mezzanine lender, a seller note, and their own equity, each with different approval processes, different timelines, and different requirements that can delay or derail the closing.
Understanding the capital stack, how the buyer is financing the acquisition, is one of the most overlooked aspects of evaluating an offer, and one of the most important predictors of whether the deal will actually close.
The capital stack in a lower middle market acquisition is the layered structure of financing that a buyer uses to fund the purchase. A typical $12M deal might include $7M in senior bank debt (first lien, lowest cost, first in line for repayment), $1.5M in mezzanine or subordinated debt (higher cost, behind senior debt), $1.5M in seller financing (the seller note), and $2M in buyer equity. Each layer has different terms, costs, and risk profiles. For sellers, the composition of the buyer’s capital stack directly affects deal certainty, closing timeline, and the risk associated with any deferred consideration.
Key Takeaways
- Most lower middle market acquisitions are financed with 50-65% debt (senior + mezzanine), 10-20% seller financing, and 20-30% buyer equity.
- SBA 7(a) loans can finance up to 75% of smaller deal values (typically under $5M) with 10-year terms and competitive rates.
- PE buyers use fund equity plus leverage (often 4-5x EBITDA in total debt) to finance acquisitions.
- The more debt in the capital stack, the less room for error in post-acquisition operations. Highly leveraged deals create pressure on the acquired business immediately.
- Sellers should evaluate financing certainty alongside price when comparing offers. A lower price with committed financing may close; a higher price dependent on uncommitted financing may not.
The Four Layers of the Capital Stack
Senior debt (first lien). The largest and cheapest component. Provided by banks, SBA lenders, or asset-based lenders. Senior lenders have first priority in repayment, if the business fails, they get paid before anyone else. Typical terms: 5-7 year amortization, floating rate tied to SOFR or prime plus a spread. Senior lenders will typically fund 2.5-3.5x EBITDA.
Mezzanine / subordinated debt. Sits behind senior debt in repayment priority. Provided by specialty lenders, private credit funds, or business development companies (BDCs). More expensive than senior debt (12-18% total yield including warrants or PIK interest). Used when the buyer needs more leverage than senior lenders will provide. Typical terms: interest-only with bullet maturity, often with equity sweeteners.
Seller note. The portion of the purchase price that the seller finances, essentially a loan from seller to buyer. Subordinated to both senior and mezzanine debt. Typical terms: 5-7 year term, 5-8% interest rate, sometimes with standby provisions that delay principal payments. Seller notes are common in SBA transactions and in deals where the buyer cannot fully finance the acquisition from external sources.
Equity. The buyer’s own capital contribution. PE buyers use fund capital. Individual buyers use personal savings, investor capital, or search fund equity. Equity is the most expensive component (highest required return) and the last to be repaid in any liquidation scenario. Typical equity contribution: 20-30% of enterprise value for individual buyers, 30-50% for PE buyers (with the balance coming from fund leverage facilities).
Why the Capital Stack Matters to Sellers
It predicts deal certainty. A buyer with committed debt financing (a signed term sheet from a senior lender) and sufficient equity is far more likely to close than a buyer who is still “working on financing” during the exclusivity period. Ask about financing status before you sign the LOI.
It affects closing timeline. SBA loans require SBA approval, which adds 30-60 days to the closing process. Conventional bank financing moves faster. PE fund financing is typically pre-committed and fastest of all. Understanding the financing source tells you what timeline to expect.
It determines the seller note requirement. If the buyer’s capital stack includes a seller note, you are carrying a portion of the purchase price as subordinated debt. Understanding where the seller note sits in the priority waterfall, and what happens if the business underperforms, is critical to evaluating the real economics of the deal.
It reveals buyer risk tolerance. A highly leveraged capital stack (4-5x total debt to EBITDA) means the buyer is maximizing their return through leverage, but also maximizing the operational pressure on the acquired business. Less room for revenue decline. Less room for integration hiccups. More risk that a performance shortfall triggers debt covenant violations.
How to Evaluate a Buyer’s Financing
Three questions to ask (through your advisor) before signing the LOI.
Is the debt financing committed? A signed term sheet from a senior lender is meaningfully different from “we are in discussions with several banks.” Committed financing dramatically increases deal certainty.
What is the total leverage ratio? Total debt (senior + mezzanine + seller note) divided by EBITDA. Above 4x, the business is carrying significant leverage. Above 5x, there is very little margin for underperformance.
What is the equity contribution? Buyers contributing 25-30%+ in equity have meaningful skin in the game. Buyers contributing less than 20% are using maximum leverage, which may indicate either aggressive deal structuring or limited access to equity capital.
Frequently Asked Questions
How do buyers finance lower middle market acquisitions?
Typically through a combination of senior bank debt (50-65% of enterprise value), mezzanine or subordinated debt (10-20%), seller financing (10-20%), and buyer equity (20-30%). The specific mix depends on buyer type, deal size, and lender appetite.
What is an SBA 7(a) loan for business acquisitions?
An SBA-guaranteed loan that can finance up to 75% of smaller deal values (typically under $5M in total project cost). SBA loans offer competitive rates and 10-year terms but require personal guarantees from the buyer and often mandate seller financing as part of the structure.
Should I accept a seller note as part of the deal structure?
It depends on the note amount relative to total consideration, the interest rate, the buyer’s creditworthiness, and your risk tolerance. A small seller note (under 15% of total deal value) with a strong buyer may be reasonable. A large note (30%+) with a first-time buyer carries meaningful risk. Understanding where the note sits in the capital stack priority is critical.
How does the buyer’s financing affect deal certainty?
Directly. Committed financing (signed lender term sheet, confirmed equity) dramatically increases the probability of close. Uncommitted financing means the deal could fall apart if the buyer cannot secure the capital during the exclusivity period.
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