Capital Structure
The combination of debt and equity financing used by a company — determining cost of capital, financial flexibility, and risk profile. In LBO M&A, capital structure optimization is the primary financial engineering lever: more debt reduces equity requirement (amplifying returns if the business performs) but increases operational risk and covenant constraints. Typical LMM LBO capital structure: 30-40% sponsor equity, 40-50% senior debt, 10-20% mezzanine/seller note.
Full Definition
Capital structure refers to the mix of debt and equity that a company uses to finance its assets and operations. In an acquisition context, capital structure describes how the purchase price is funded — the combination of senior debt, subordinated debt, mezzanine, seller financing, equity, and other instruments the buyer assembles to close the deal. The capital structure decision is one of the most consequential in any acquisition: it drives the cost of capital, risk profile, return potential, and post-close operational flexibility.
The acquisition financing stack: In leveraged acquisitions, capital typically layers from least risky to most risky: senior secured debt (first priority claim on assets, lowest cost, 5–10% interest), senior unsecured or second lien debt (higher cost, 10–14%), mezzanine or subordinated debt (often 12–18%, sometimes with PIK or equity participation), seller financing (negotiated, often 4–8%), and equity (highest risk, no return guarantee but captures upside). Each layer has different cost, seniority, and terms.
Leverage ratios: The amount of debt relative to EBITDA is the key leverage metric. "4x leveraged" means total debt equals four times trailing EBITDA. Lenders and sponsors focus on: Senior Debt / EBITDA (typically 2.5x–4x for SMB cash flow loans), Total Debt / EBITDA (often 4x–6x in PE transactions), and Interest Coverage Ratio (EBITDA / Interest Expense, typically 2x+ minimum). SBA 7(a) loans are effectively fixed leverage instruments — the SBA allows up to ~90% LTV of the total transaction costs, creating leverage ratios that depend on the business's cash flow.
Equity cushion: The equity in the capital structure provides a cushion against downside — if the business performs below expectations, equity absorbs losses before debt holders are impaired. A deal with 90% leverage and 10% equity has almost no cushion; a deal with 40% equity provides substantial downside protection. Private equity historically uses 50–70% debt and 30–50% equity; SBA acquisition loans often achieve 90%+ leverage for qualified buyers.
Post-close capital structure management: The optimal capital structure at acquisition may not be optimal 3 years later. As the business generates cash flow and pays down debt, the leverage ratio improves. Sponsors often refinance acquisition debt as leverage decreases and business performance improves — accessing cheaper permanent capital to replace expensive bridge or mezzanine financing.
Seller vs. Buyer Perspective
As a seller, you rarely negotiate the buyer's capital structure directly — that's their problem. But the structure affects you indirectly: a buyer who is highly leveraged has less flexibility to honor earnouts, fund working capital, or invest in the business post-close. If you are accepting a seller note as part of your consideration, you are effectively participating in the buyer's capital structure as a subordinated lender — understand where your note sits in the priority stack and what protections you have if the business struggles.
The capital structure decision should be driven by the business's risk profile and cash flow stability, not just the desire to maximize leverage and minimize equity contribution. High leverage maximizes returns in upside scenarios but creates existential risk in downside scenarios. Use the minimum leverage level at which you can achieve your return targets while maintaining adequate liquidity and operational flexibility. A business with cyclical revenue, customer concentration, or operational complexity deserves a more conservative capital structure than a stable, recurring-revenue business.
Real-World Example
A PE sponsor acquires a $10M EBITDA distribution business for $60M (6x EBITDA). Capital structure: $35M senior term loan (3.5x EBITDA, 8% interest), $10M seller note (1x EBITDA, 6% interest, 5-year term), $15M sponsor equity (25% of deal). Annual debt service: $3.0M senior interest + $3.5M principal + $600K seller note interest = ~$7.1M total. DSCR: $10M / $7.1M = 1.41x. This structure works under base-case projections but would be stressed at 20% EBITDA decline — a scenario the sponsor models explicitly before closing.
Why It Matters & Common Pitfalls
- !Optimizing for maximum leverage often maximizes bankruptcy risk. The deals that blow up are almost always the most aggressively leveraged. Stress-test your capital structure at 20% and 30% EBITDA declines. If you can't service debt in those scenarios, you have too much leverage.
- !Seller notes are subordinated and unsecured by default. If you accept a seller note, it is typically junior to all bank debt. In a business failure, you receive nothing until senior lenders are made whole — which often means you receive nothing at all. Price the credit risk into your note negotiations.
- !Covenant violations can force refinancing at the worst time. Maintenance financial covenants (EBITDA / interest coverage, leverage ratios) tested quarterly can trigger default provisions if business performance slips — even if the company has adequate cash. Negotiate headroom in financial covenants and understand exactly what triggers a default.
- !Post-close investment needs to be funded. Working capital requirements, capex, growth investments, and integration costs all compete with debt service for operating cash flow. A capital structure that works mathematically under steady-state assumptions may leave no room for the inevitable post-close operational investments.
Frequently Asked Questions
What is capital structure in M&A?↓
Why does capital structure matter in an LBO?↓
Related Terms
Leveraged Buyout (LBO)
An acquisition where a significant portion of the purchase price is financed with debt, typically secured by the acquired business's assets and cash flow — the foundational private equity deal structure.
Senior Debt
The highest-priority debt in a capital structure — first to be repaid in default, typically secured by business assets, and carrying the lowest interest rate of any debt tranche due to its preferred position.
Mezzanine Financing
Subordinated debt or preferred equity that sits between senior debt and common equity in an LBO capital structure — costlier than senior debt but cheaper than equity, with flexible terms and often equity-like upside features.
Seller Note
A promissory note issued by the buyer to the seller for deferred payment of part of the purchase price — the specific instrument through which seller financing is delivered.
Equity Rollover
When the seller reinvests a portion of their sale proceeds into equity of the buyer (or the acquisition vehicle), maintaining ownership in the combined business post-close.
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Disclaimer: The information provided on this page is for educational and informational purposes only. It should not be considered financial, legal, or investment advice. Business valuations depend on many factors specific to each situation. Always consult with qualified professionals — including business brokers, CPAs, and M&A attorneys — before making acquisition or sale decisions. LegacyVector is not a licensed broker, financial advisor, or attorney. Data shown may be based on limited samples and may not reflect current market conditions.
LegacyVector Research Team
Reviewed by M&A professionals · Updated April 2026