Secured vs. Unsecured Debt
Secured debt has collateral backing it — paid first in default. Unsecured debt has no collateral and recovers last. Seller notes and mezzanine are typically unsecured.
Full Definition
Secured debt is backed by specific collateral — assets pledged by the borrower that the lender can seize upon default. Unsecured debt has no such collateral claim; the lender's only recourse is a general creditor claim against the borrower's assets in bankruptcy. The distinction matters enormously in M&A because it determines the lender's recovery position, the interest rate on the debt, and how much debt a business can support.
In SMB acquisitions, the acquisition debt stack typically consists of: (1) senior secured debt — first lien bank term loans or SBA 7(a) loans, secured by all business assets (accounts receivable, inventory, equipment, real estate if owned, and intellectual property), typically carrying the lowest interest rate (7–10% in current markets); (2) junior secured or mezzanine debt — subordinated to senior lenders but still secured, typically carrying higher rates (12–18%); and (3) unsecured obligations — seller notes (often subordinated to all senior lenders), earnouts, and trade payables.
The security package determines the pecking order in distress. Senior secured lenders are first in line; they are repaid from asset liquidation proceeds before any junior creditor sees a dollar. Unsecured creditors share whatever is left over after all secured claims are satisfied — which in a distressed SMB sale can be very little.
Interest rates on secured debt are lower because the collateral reduces lender risk. SBA 7(a) loans are secured and government-guaranteed, making them the cheapest acquisition debt available. Unsecured debt (seller notes, mezzanine) carries higher rates to compensate for the greater default risk. The blend of secured and unsecured debt in the capital structure directly affects the business's total cost of capital and its ability to service its obligations from operating cash flow.
Seller vs. Buyer Perspective
If you are carrying a seller note post-close, understand that your note is almost certainly subordinated to all senior secured lenders. In a distressed scenario, the bank gets paid first. Negotiate an intercreditor agreement with the senior lender that defines the conditions under which you can receive payments on your seller note — including whether there are standstill periods during which the bank can block payments to you.
Build your acquisition debt stack from senior to junior to understand your blended cost of capital. Maximize senior secured debt (cheapest) and minimize unsecured obligations (most expensive). If a seller insists on a seller note, negotiate a subordination agreement with your senior lender before closing — many lenders require seller notes to be on full standstill during periods of covenant default.
Understand what assets are available as collateral. SBA lenders require a security interest in all business assets; if significant assets are leased rather than owned, your collateral package is thinner and the lender may require personal guarantees or additional outside collateral.
Real-World Example
A buyer acquired an industrial services company with a $6M capital structure: $3M SBA 7(a) term loan (secured, first lien on all assets), $1.5M conventional bank revolver (secured, also first lien), $1M seller note (unsecured, subordinated to all bank debt), and $500K buyer equity. The SBA loan carried 8.5% interest; the revolver was prime plus 1.5% (~10% at close); the seller note carried 6% interest in a paid-in-kind (PIK) structure, allowing interest to accrue without cash payment for the first two years.
Why It Matters & Common Pitfalls
- !Seller notes without intercreditor terms. A seller who takes a note without reviewing the intercreditor agreement may discover they cannot receive payments on their note during the bank's standstill periods — potentially years of blocked payments.
- !Over-relying on personal guarantees. Banks often require personal guarantees on SMB acquisition loans. A buyer who signs unlimited personal guarantees on all secured debt is putting personal assets at risk that they may not have adequately considered. Negotiate guarantee limitations where possible.
- !Confusing lien priority with maturity. A secured lender with a first lien due in five years is senior in priority to a seller note due in three years regardless of maturity. Priority (security position) determines recovery in bankruptcy, not maturity dates.
- !Collateral value overestimation. In distressed scenarios, asset liquidation values are typically 20–40% of book value for equipment, much less for specialized assets. Buyers and lenders should model recovery on a forced liquidation basis, not book value.
Frequently Asked Questions
What is the difference between secured and unsecured debt?↓
Is a seller note secured?↓
Related Terms
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.
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.
PIK (Payment-in-Kind)
Interest or dividends that accrue and compound into the principal balance rather than being paid in cash — preserving early cash flow for the borrower while increasing the ultimate repayment amount at maturity.
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.
Get Weekly M&A Insights
Valuation data, deal analysis, and plain-English M&A education — every week.
The LegacyVector Newsletter
Join 5,000+ business owners, investors, and buyers who get weekly M&A market data and deal insights.
- Weekly valuation multiples by industry
- SBA lending rates & deal financing data
- Market trends & acquisition opportunities
No spam. Unsubscribe anytime. Free forever.
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