Deal Stack: How Acquisition Financing Layers Come Together
A deal stack is the combination of all funding sources assembled to cover the purchase price of a business. Most acquisitions don't get paid with a single check — instead, several layers of financing stack on top of each other, each with different risk profiles, interest rates, repayment priority, and requirements.
Understanding how these layers interact is the core skill of deal structuring. The right stack maximizes what you can buy with the cash you have while keeping debt service manageable enough that the business can actually pay it back.
The Four Common Layers
1. Buyer Equity (Bottom of the Stack)
The buyer's own cash injected at closing. This is the first money at risk if the business fails. SBA-financed deals require a minimum of 10% equity injection. Paying more equity lowers the loan amount but protects you if earnings come in below projections.
2. Senior Debt (Largest Layer)
The primary institutional loan — typically an SBA 7(a) loan for small business acquisitions, or a conventional bank loan for larger deals. Senior debt has the first claim on business assets in default, so it carries the lowest interest rate. It's also the hardest to get approved because lenders underwrite the deal's DSCR rigorously.
3. Seller Financing (Middle Layer)
The seller carries a portion of the purchase price as a promissory note. This layer is subordinate to the SBA loan — the seller gets paid after the bank. In SBA transactions, seller notes must be on full standby for 24 months if they count toward the buyer's equity injection. Seller financing is the most flexible layer because its terms are negotiated directly between buyer and seller.
4. Earnout (Contingent Layer)
An earnout isn't always present, but when it is, it sits at the top of the stack — contingent on future performance. Because it only pays if results materialize, it has the least downside for the buyer and the most uncertainty for the seller.
Example: A $1M Deal Stack
| Layer | Amount | % of price |
|---|---|---|
| Buyer equity | $100,000 | 10% |
| SBA 7(a) loan | $700,000 | 70% |
| Seller note (standby) | $100,000 | 10% |
| Earnout (contingent) | $100,000 | 10% |
| Total | $1,000,000 | 100% |
This structure gets a buyer into a $1M business with $100K in cash. The seller gets 80% at close plus $100K seller note plus up to $100K in earnout. The key is whether the business generates enough SDE to service the SBA loan and (eventually) the seller note after standby expires.
What Makes a Stack Work
Every deal stack must pass the DSCR test: the business's post-owner-salary earnings divided by total annual debt service must be at least 1.25×. Stacking too much debt produces a ratio below 1.25× and the SBA lender won't fund it. The AcquireCalc calculator models this automatically — adjust your stack until DSCR clears the threshold.
Seller-Only Deals (No Bank)
Some deals have no institutional lender at all — the seller finances the entire purchase minus the buyer's equity. These are more common on smaller deals (under $300K) and where sellers are highly motivated. The stack is simply: buyer equity + seller note covering the rest. Higher interest rate risk for the seller, but faster close and no bank underwriting.
Deal-Model Context
A deal stack is the practical bridge between purchase price and cash at closing. It forces the buyer to identify every source and use of funds instead of assuming the purchase price must be paid entirely with buyer cash or bank debt.
Model the stack from most certain to least certain. Buyer equity and approved bank debt are stronger than speculative earnouts or unconfirmed asset financing. Seller financing may reduce cash at closing, but it still creates future debt service and negotiation risk.
Buyer Diligence Questions
A complete stack should include purchase price, working capital target, closing costs, lender fees, debt payoff, assumed liabilities, seller notes, earnouts, investor equity, asset-based funding, and reserves. Missing any one layer can turn a zero-down concept into a cash shortfall.
This term connects to seller financing, SBA debt, asset-based lending, earnouts, equity rollover, and DSCR. Ask which funding sources are binding, which depend on seller consent, and whether the final structure leaves the company stable after closing.
Practical Review Checklist
Before relying on Deal Stack: How Acquisition Financing Layers Come Together in an acquisition model, turn the term into a written assumption. State what source document proves it, what dollar amount or risk category it changes, and whether it affects purchase price, cash at closing, debt service, working capital, legal exposure, or post-close operations. That step makes the concept auditable instead of merely descriptive.
For buyer diligence, collect at least one primary source document, one seller explanation, and one downside case. If the source document is missing, keep the assumption out of the base case. If the downside case changes DSCR, working capital, customer retention, or transition risk enough to threaten closing, address it through price, seller financing, escrow, earnout, indemnity, or a closing condition.
When using AcquireCalc, enter the verified number first, then test the seller's number and a conservative number. The spread between those cases shows whether Deal Stack: How Acquisition Financing Layers Come Together is a minor definition, a negotiation point, or a risk that should change the structure of the deal.
Related Terms
- SBA 7(a) loan — the senior debt layer in most financed acquisitions
- Seller financing — the subordinated middle layer
- Earnout — the contingent top layer
- DSCR — tests whether the stack is serviceable