Sooner or later, almost every business gets the request: “Send us a certificate of insurance showing your workers’ comp.” It might come from a general contractor, a landlord, a franchisor, or a big customer. And if you hire subcontractors yourself, you should be making the same request of them.
Certificates of insurance are one of those small administrative details that can have outsized financial consequences — especially at audit time. Here’s how they work and how to handle them on both sides of the transaction.
What a Certificate of Insurance Actually Is
A certificate of insurance, or COI, is a one-page snapshot summarizing your coverage: the carrier, policy numbers, effective dates, and limits. It’s evidence that a policy existed on the date the certificate was issued. It is not the policy itself, and it typically doesn’t change or extend coverage — a point courts and carriers take seriously.
Certificates are usually issued by your insurance agent at no charge, often within a day. If a client needs one, the request should go to your agent, not the carrier’s billing department.
Why Clients and General Contractors Ask for Them
When a business hires you, your injury exposure can become their problem. If your worker is hurt on their job site and you don’t carry workers’ comp, the claim may roll up to the hiring business — and at their premium audit, uninsured subcontractor payments are often charged as if the subs were employees. Requiring a COI before work starts is how businesses protect themselves from both outcomes.
That’s why a current certificate is increasingly the price of admission for commercial work. Contractors without one often find they simply can’t get on the job site.
If You Hire Subcontractors, Collect Certificates Every Time
The same logic applies in reverse. If you pay subcontractors and can’t produce a valid workers’ comp certificate for each one at audit, your carrier may add their payments to your payroll and charge premium on it. The fix is procedural: collect a certificate before each sub starts work, confirm the coverage dates span the work period, and keep the certificates organized by year so they’re ready when the auditor asks.
It’s also wise to re-collect certificates annually, since a certificate only reflects coverage as of its issue date — a policy can be cancelled the week after it’s issued.
Waivers of Subrogation and Other Contract Add-Ons
Many contracts go a step beyond a basic certificate and require a waiver of subrogation. That’s an endorsement in which your carrier agrees not to pursue the other party to recover claim payments. Carriers typically charge a modest premium for these endorsements, and they generally must be added to the policy — simply typing the words on a certificate usually isn’t enough. If a contract asks for one, send the contract language to your agent before you sign.
Common Certificate Mistakes to Avoid
A few errors show up constantly: letting certificates expire mid-project without renewing them, accepting a sub’s certificate without checking the dates, assuming a certificate means coverage still exists months later, and signing contracts with insurance requirements your policy doesn’t actually meet. Each one is cheap to prevent and expensive to discover late.
Make Certificates Someone’s Job
Whether it’s you, a bookkeeper, or your agent’s office, certificate tracking works best when one person owns it. An independent agent can issue certificates quickly, review contract insurance requirements before you sign, and help you set up a simple system for collecting and renewing subcontractor certificates. If your current process is a folder of PDFs you hope is complete, it may be worth a conversation.