What Is a Certificate of Insurance?

In business, trust is essential—but verification is required. Whether you are a property manager hiring a contractor or a vendor bidding on a major commercial contract, you cannot rely on a handshake to manage risk. You need proof of coverage.

That is where a Certificate of Insurance (COI) comes in.

At VendorAccess, we manage risk and compliance daily. Here is a straightforward, pragmatic breakdown of what a COI is, why it matters, and how to use it to protect your business.

The Definition: What is a COI?

A Certificate of Insurance (COI) is a standard, one-page document that serves as official proof of an active insurance policy. Issued by an insurance broker or agency, it summarizes the most critical elements of a policyholder’s coverage.

Think of it as an insurance resume. Instead of forcing a client to read through a 50-page legal policy document, a COI provides the essential facts at a glance.

What is Included in a COI?

To be valid and useful, a COI must contain specific, standardized information. Most commercial industries use the ACORD 25 form, which outlines:

• The Insured: The individual or business that owns the policy (the vendor or contractor).
• The Insurer: The insurance company backing the policy.
• The Certificate Holder: The entity requesting proof of insurance (the property manager, landlord, or client).
• Types of Coverage: Typically includes General Liability, Workers' Compensation, Commercial Auto, and Umbrella/Excess Liability.
• Policy Limits: The maximum amount the insurer will pay for a claim or during the policy period.
• Effective and Expiration Dates: The exact timeframe the coverage is active.

Why Do You Need One?

For businesses hiring vendors, requesting a COI is standard risk management. If a third-party contractor damages a property or causes an injury on-site, their insurance should cover the cost. Without a verified COI, that financial liability could fall squarely on your shoulders.

For vendors, providing a COI is a prerequisite to winning contracts. It proves you are a legitimate, responsible professional who carries the necessary financial backing to do the job safely.

Key Pitfalls to Avoid

As a trusted advisor in vendor compliance, we see two common mistakes that expose businesses to massive risk:

1. Accepting Expired Certificates: Policies lapse. A COI is only a snapshot of coverage on the day it was issued. You must track expiration dates and request updated certificates before the old ones expire.
2. Confusing a COI with an Additional Insured Endorsement: Simply being listed as a "Certificate Holder" at the bottom of a COI does not grant you coverage under the vendor’s policy. If your contract requires you to be protected by their insurance, you must explicitly request an Additional Insured Endorsement.