A certificate of insurance, often shortened to COI, is a one-page document that summarizes an insurance policy: who is covered, what types of coverage are in force, the policy limits, and the effective dates. You need one whenever a contract, landlord, regulator, or project owner wants fast proof that the other party carries adequate insurance without reading the full policy. The certificate itself does not create coverage. It confirms that a policy existed on the day the certificate was issued, and that distinction matters more than most people realize.
What a COI Shows
Most certificates follow the ACORD 25 format, the industry-standard template for certificates of liability insurance.1ACORD. Certificates of Insurance FAQ On a single page, the form lists each line of coverage, the insurer providing it, and the limits attached. The coverage lines you’ll typically see are general liability, commercial auto, workers’ compensation, professional liability (sometimes called errors and omissions), and umbrella or excess liability.
Policy limits tell you the maximum the insurer will pay. A general liability section might show a $1 million per-occurrence limit and a $2 million aggregate limit, meaning the insurer covers up to $1 million for any single claim and no more than $2 million total during the policy period. Deductibles and self-insured retentions, if any, show how much the insured pays out of pocket before coverage responds.
Three fields on the form deserve particular attention. The effective and expiration dates sit near the top: an expired certificate proves nothing, so check these first. The certificate holder field shows who requested the document. And the description of operations box at the bottom often carries the contract-specific details, including project names, locations, and endorsement language. That description box is where the most important contractual provisions tend to hide.
When You Need a Certificate of Insurance
The common thread across every situation that calls for a COI is simple: whoever faces financial exposure from someone else’s operations wants proof that insurance exists to absorb that risk.
Construction generates more COI requests than probably any other industry. Projects stack general contractors, subcontractors, and specialty trades, each carrying their own policies. Project owners and general contractors require COIs to verify that every party on the job has liability and workers’ compensation coverage, because an injury on the job site can push financial responsibility upward to whoever failed to confirm coverage.
Commercial leasing is another heavy user. Landlords ask business tenants to provide COIs showing general liability and property insurance, and many leases set minimum coverage limits. Failing to produce a valid COI can delay your move-in or put you in default.
Freight and transportation operate under federal rules. The Federal Motor Carrier Safety Administration requires for-hire motor carriers to maintain minimum levels of liability insurance as a condition of operating authority. Carriers hauling non-hazardous property in vehicles over 10,001 pounds must carry at least $750,000 in liability coverage, with higher minimums for certain hazardous cargo.2eCFR. 49 CFR Part 387 – Minimum Levels of Financial Responsibility for Motor Carriers FMCSA won’t grant operating authority until proof of insurance is on file, and carriers whose coverage lapses face revocation proceedings.3FMCSA. Insurance Filing Requirements Freight brokers and shippers routinely refuse to work with any carrier that can’t produce a current COI.
Event venues ask organizers for liability coverage against potential property damage or injuries during the event, often with minimum limits and venue-as-additional-insured language. Professional services clients hiring consultants or IT firms may require a COI confirming professional liability coverage. If you run a business, expect to be asked for one at some point.
Certificate Holder vs. Additional Insured
This is the most misunderstood distinction in COI practice, and getting it wrong can leave you completely unprotected.
Being named as a certificate holder means you received a copy of the certificate. It proves the other party has insurance. It does not extend any coverage to you, and it does not give you the right to file a claim under their policy.
Being named as an additional insured is a different thing entirely. An additional insured endorsement actually extends the insured’s liability coverage to you for claims arising out of the named insured’s work or operations. If a subcontractor’s employee is injured on your project and you’re listed as an additional insured on the subcontractor’s general liability policy, that policy can respond to claims made against you. If you’re only a certificate holder, you’re on your own.
When your contract requires additional insured status, confirm the endorsement is noted in the description of operations and, better, ask for a copy of the endorsement itself. A certificate mentioning the endorsement is helpful; the endorsement attached to the policy is what actually changes the coverage.
Endorsements Contracts Often Require
Beyond additional insured status, several endorsements commonly appear on COIs because contracts require them. Each shifts risk in a specific way.
- Waiver of subrogation. Normally, after an insurer pays a claim, it can try to recover that money from whichever third party was responsible. A waiver of subrogation endorsement gives up that right. Contractors, landlords, and clients frequently require it so the insurer can’t come after them to recoup what it paid.
- Primary and noncontributory. When two policies could both respond to the same loss, this endorsement says the named insured’s policy pays first and doesn’t seek contributions from other policies that might also apply. A project owner requiring this language ensures the contractor’s insurance pays before the owner’s own policy gets involved.
- Per-project aggregate. A standard general liability policy applies one aggregate limit across every job the insured works on during the policy period. A per-project aggregate endorsement gives each designated project its own separate aggregate limit, so a large claim on one job doesn’t eat into the coverage available for yours.
If your contract calls for any of these, confirm they appear on the COI and request copies of the endorsements themselves.
How to Get a COI Issued
Certificates are issued by insurance companies or brokers on behalf of policyholders. When you buy a policy, your insurer or agent can generate a certificate on request, and many insurers now let you download certificates instantly through online portals. You can request your own COI at no cost in most cases, but you cannot alter it. The document must come directly from the insurer or an authorized agent.
The ACORD 25 covers liability insurance.1ACORD. Certificates of Insurance FAQ If someone needs proof of property coverage, the right forms are the ACORD 24 or ACORD 27, not the 25. Ask what the requester actually needs before you order.
How to Verify a COI You Receive
Accepting a certificate at face value is a mistake. Fraudulent certificates are a real problem, particularly in construction and trucking, and a few verification steps protect you from relying on coverage that doesn’t exist.
Start with the insurer. Every COI lists the insurer’s name and NAIC number, the unique identifier assigned by the National Association of Insurance Commissioners. Search that number on the NAIC’s Consumer Insurance Search tool to confirm the company is real, licensed in your state, and in good financial standing. Your state’s insurance department website can also verify a company’s license status.
Then confirm the certificate came from someone authorized to issue it. Call the insurance company or broker directly, using a number you find independently rather than one printed on the document, and ask them to confirm the policy number, coverage types, limits, and effective dates match what the COI shows.
Finally, match the COI against your contract. Confirm the coverage types include everything the contract requires. Verify that the limits meet or exceed your minimums. Check that any required endorsements, including additional insured status, waiver of subrogation, and primary and noncontributory language, are reflected on the certificate or, ideally, that you’ve received copies of the actual endorsements. A certificate that looks complete but falls short of your contract is almost as useless as no certificate at all.
What a COI Does Not Do
The most dangerous mistake is treating a certificate as if it were insurance coverage itself. It is not. The ACORD 25 states on every form that the certificate “does not affirmatively or negatively amend, extend or alter the coverage afforded by the policies” listed on it, and that it “does not constitute a contract between the issuing insurer(s), authorized representative or producer, and the certificate holder.”1ACORD. Certificates of Insurance FAQ Relying on a COI without ever reviewing the actual policy is how businesses discover exclusions and coverage gaps after a claim has been denied.
A COI also does not guarantee coverage will stay active through the expiration date printed on it. Policies get canceled midterm. A certificate issued in January showing coverage through December doesn’t mean coverage will actually last until December. If the insured stops paying premiums in March, the certificate becomes worthless, and no one is obligated to notify you unless a specific cancellation-notice endorsement is in place.
Many contracts specify that the insurer must give certificate holders advance written notice, commonly 30 days, before canceling a policy. Whether the insurer actually owes that notice depends on the policy language and the endorsement, not on the certificate. In practice, many insurers will not send cancellation notices to certificate holders unless a specific endorsement requires it. If your contract calls for advance notice, confirm the insurer has endorsed the policy accordingly rather than assuming the certificate creates that duty.
Renewal isn’t automatic either. When a policy renews or the insured switches carriers, someone has to request a new certificate. Many businesses require updated COIs annually or upon policy renewal, and some long-term contracts require them at set intervals throughout the project.
Consequences of Getting It Wrong
Failing to provide a valid COI when your contract requires one can trigger termination or put you in breach. Many agreements make maintaining insurance a condition of doing business, and a missing or invalid certificate is the clearest evidence that you’ve failed to meet that condition.
Providing a fraudulent COI is worse than providing none at all. Creating or altering a certificate to misrepresent coverage can constitute insurance fraud, which carries criminal penalties including felony charges, fines, and imprisonment in most jurisdictions. On the civil side, if an uninsured party causes property damage or injuries that the fake certificate was supposed to cover, that party faces full personal or corporate liability for the damages with no insurer behind them.
In regulated industries, the consequences go beyond contract disputes. In trucking, failing to maintain required insurance can result in revocation of operating authority.3FMCSA. Insurance Filing Requirements Construction and healthcare regulators may impose fines or revoke licenses for noncompliance with insurance requirements.
Businesses that fail to verify COIs from vendors or subcontractors also put themselves at risk. If an uninsured subcontractor causes a loss and you didn’t verify their coverage, you may be held liable for damages that their insurance should have covered. Courts regularly consider whether insurance was contractually required and whether the party relying on it took reasonable steps to confirm coverage existed. Skipping verification to move faster looks efficient right up until the moment it isn’t.