What Is a COI? Certificate of Insurance Explained (2026 Guide)

What Is a Certificate of Insurance?

A Certificate of Insurance, or COI, is a one- or two-page document issued by an insurance company or agent that confirms a business or individual has active insurance coverage. It lists the type of insurance (general liability, auto, workers' compensation, etc.), the policy limits, effective dates, and the named insured. The standard format in the United States is the ACORD 25 form, developed and maintained by ACORD, the insurance industry standards organization.

What a COI is NOT: It is not a policy, not an endorsement, and not a contract of insurance. It does not change any terms of the underlying policy. The ACORD 25 form itself includes a disclaimer: "This certificate is issued as a matter of information only and confers no rights upon the certificate holder."

Most COIs include these sections:

• Producer/Agent: Contact info for the agent who issued the certificate.
• Insured: The name and address of the business or person with the policy.
• Certificate Holder: The person or company requesting proof of insurance (the client, landlord, or venue).
• Coverages: Typically commercial general liability, automobile liability, workers' compensation, and umbrella/excess. Each shows the policy number, effective dates, and limits per occurrence.
• Description of Operations: A free-text field that may list the specific project, location, or job for which the COI was requested.
• Cancellation/Non-Renewal Notice: Many states allow the certificate holder to be notified if the policy is canceled mid-term, but this varies by jurisdiction and by the insurer's willingness to accept that obligation.

Most people glance at a COI, see a policy limit like $1 million, and assume they are protected. The real story is in the smaller print. Here is how to decode the key fields on an ACORD 25 form.

Limits shown per occurrence vs. aggregate. The "per occurrence" limit is the maximum the insurer pays for a single claim. The "aggregate" limit is the total the insurer pays for all claims during the policy term. A $2 million aggregate with a $1 million per-occurrence limit means the insurer will not pay more than $1 million for any one event, even if the aggregate is not exhausted. If you have multiple claims in one year, the aggregate is the hard cap.

Policy effective dates. Look for the exact dates, not just the month and year. A COI issued on March 1 for a policy that started January 1 and ends January 1 of the following year is 10 months into the term. If a claim occurs in December, coverage is still active, but the COI itself is nearly a year old and may not reflect any mid-term changes (cancellation, non-renewal, or endorsement).

Additional insured status. This is the single most common misunderstanding. A COI may list a certificate holder but not name them as an additional insured. To be an additional insured, the policy must have an explicit endorsement (ISO form CG 20 10 or similar). The ACORD 25 form has a checkbox in the "Certificate Holder" section, but many COIs leave it unchecked. If it is unchecked, the certificate holder cannot rely on the policy for their own liability, they have merely seen proof that the insured has coverage.

Businesses and individuals are asked for a COI in a wide range of situations. The most common scenarios are:

1. Hiring a contractor. If you hire a roofer, plumber, or electrician, ask for their COI before work begins. Confirm the policy is current and covers the type of work they are doing.
2. Renting or leasing space. Landlords typically require tenants to provide a COI showing general liability coverage. For commercial leases, the landlord may also require workers' comp.
3. Signing a vendor agreement. Companies that hire consultants, caterers, or event planners will request a COI to ensure the vendor is not self-insured and can cover any accidents.
4. Obtaining a permit or license. Many cities require contractors to show proof of insurance before issuing a building permit. The COI is often submitted with the permit application.
5. Participating in a trade show or market. Venue operators almost always require exhibitors to provide a COI before setting up a booth.

If you are the party requiring a COI from someone else, ask for it before they start work, not after an incident occurs. Request a copy of the actual policy's additional insured endorsement if you need to be named as an additional insured. The COI alone does not prove that. 247defensivedriving Com Coupon Code is an unrelated resource, but verifying insurance before hiring is a similar diligence step many skip.

two notable shifts affect how businesses handle Certificates of Insurance. First, several states have tightened requirements around cancellation notice obligations. In California, for example, new regulations (effective January 1, 2026) require that any COI issued for public entity contracts include the insurer's written commitment to provide at least 30 days' notice before cancellation. Previously, this was a voluntary checkbox; it is now mandatory for certain public works projects.

Second, the insurance industry has continued its move toward electronic COI issuance. As of 2026, approximately 60% of commercial COIs are delivered via digital portals rather than paper or PDF (ACORD Industry Survey, 2025). This improves accuracy but introduces a new risk: a stale COI that was never updated in the portal. Always verify the issue date and policy effective dates, not just that the portal shows a valid certificate.

Expert Tips

• Request a COI dated within 30 days of the start of any project, older certificates may not reflect mid-term changes.
• If you need to be an additional insured, ask for the endorsement (CG 20 10 or equivalent), not just a checked box on the ACORD form.
• For high-value contracts, request a copy of the policy's declarations page in addition to the COI, it shows the exact policy wording for coverage triggers.
• Set calendar reminders to request updated COIs annually or at project renewal, don't rely on the contractor to send them unprompted.
• Store all COIs electronically with metadata (project name, dates, policy number) so you can find them quickly if a claim arises.

Mistakes to Avoid

• Assuming the COI is a contract, it is not. It only proves a policy existed on the issue date.
• Accepting a COI that shows cancellation policy as "none" or blank, especially if you need ongoing coverage.
• Not verifying that the policy covers the specific type of work being performed. A general liability policy may exclude certain risks (e.g., professional services, pollution, or cyber).

Pros and Cons

Bottom Line

A Certificate of Insurance is a useful but limited document. It answers the basic question, "Does this business have active coverage?", but does not answer the deeper question: "Does that coverage protect me?" For routine vendor checks and low-value contracts, a COI is sufficient. For high-value projects or work with serious liability exposure, request the actual policy endorsements and possibly a copy of the declarations page. 7 Auto Repair and Aa Breakfast Club are unrelated services; the same due diligence applies, know what you are relying on before you rely on it.