A security interest is a property interest in collateral that secures payment or performance of an obligation.
A security interest is a property interest in collateral that secures payment or performance of an obligation. Under U.S. Article 9, the term generally concerns personal property and fixtures, including goods, receivables, accounts, investment property, deposit accounts, and certain other rights.
The interest must attach to become enforceable against the debtor. Perfection and priority then determine how the interest fares against buyers, lien creditors, insolvency representatives, and competing secured parties.
| Concept | Question answered | Typical failure |
|---|---|---|
| Attachment | Is the interest enforceable against the debtor? | No value, no debtor rights, or ineffective grant/description |
| Perfection | Has the required third-party protection step occurred? | Wrong office, method, name, timing, or lapse |
| Priority | Which competing claimant ranks ahead? | Earlier filing, control priority, buyer rule, PMSI, statutory claim |
Perfected does not mean first priority. A later-perfected interest can lose to an earlier claimant, while a qualifying special-priority interest can outrank an earlier blanket filing.
On March 1, a lender commits to finance a printing press. On March 5, the company authenticates a security agreement describing the press. On March 10, the lender funds the loan and the company acquires rights in the press. On March 11, the lender files an effective financing statement in the proper office.
| Date | Event | Significance |
|---|---|---|
| March 1 | Credit commitment | Value may be given, but collateral and grant facts still matter |
| March 5 | Security agreement authenticated | Grant and description requirement addressed |
| March 10 | Funding and acquisition | Interest can attach when all requirements are satisfied |
| March 11 | Effective filing | Interest can become perfected by filing |
The filing does not create the March 10 attachment facts. If the debtor name is seriously misleading, the filing may be ineffective even though the security agreement remains enforceable between the parties.
Article 9 uses defined collateral types because classification affects perfection and priority. Examples include:
The same asset can be classified differently depending on its use. A vehicle held for sale can be inventory, while the same model used in operations can be equipment.
| Method | Common use | Important limitation |
|---|---|---|
| Filing | Many goods, accounts, and general intangibles | Correct office, debtor name, collateral indication, continuation |
| Possession | Certain goods, instruments, money, documents | Custody, duties, and continuous possession matter |
| Control | Deposit accounts, investment property, electronic chattel paper | Statutory control test and priority rules vary by asset |
| Title or other statute | Titled vehicles and federally regulated property | Article 9 filing may not be sufficient |
| Automatic perfection | Specified transactions such as some consumer-goods PMSIs | Exceptions and limited duration can apply |
Choosing the wrong method can leave an interest unperfected even when a financing statement was filed.
A lien is a broader term for a charge or claim against property and can arise by agreement, statute, judgment, or other law. An Article 9 security interest is generally consensual or otherwise within Article 9’s defined scope.
The debtor usually remains the owner of collateral before enforcement. The security interest gives defined rights; it does not automatically transfer full ownership to the secured party.
An attached security interest can extend to identifiable proceeds under Article 9. Agreements can also cover after-acquired property, subject to statutory limits. These rules are important for inventory and receivables because the original assets are constantly sold, collected, or replaced.
Identifying proceeds, maintaining perfection, and tracing commingled funds can be difficult. A broad grant should not be confused with unlimited practical recovery.
Security interests can fail through defective grants, descriptions, filings, control arrangements, continuations, or authorization. Collateral can disappear, depreciate, be sold to protected buyers, or become subject to higher-priority claims. Bankruptcy can stay enforcement and alter timing and recovery.
State enactments and non-UCC law vary. This page is educational and is not legal, bankruptcy, lending, or personalized financial advice.