Does a Certificate of Insurance Actually Protect You at Your Workers’ Comp Audit?

Short answer: only if it’s the right certificate, covering the right dates. A COI sitting in a folder doesn’t automatically keep a subcontractor off your workers’ comp audit. Auditors look at three things.

1. Is there a workers’ comp line?

Many certificates show general liability but no workers’ comp. GL does not exclude the sub from your WC audit. If the WC box is blank, the auditor can treat the sub as your payroll.

2. Are the limits adequate?

The coverage has to meet your policy’s and your state’s requirements. A token policy that doesn’t meet minimums can be disregarded.

3. Do the dates cover the whole job?

This is the one that bites good contractors. The COI’s effective-to-expiration window has to span the entire period the sub worked for you. Two common failures:

• Coverage started after the sub began working — the early days are uncovered, and chargeable to you.
• Coverage expired before the job ended (or was cancelled for non-payment mid-project) — the tail is chargeable to you.

A certificate you collected in March doesn’t prove coverage for work done in January, and it doesn’t prove the policy wasn’t cancelled in June.

So what actually protects you?

Verification and timing, not just possession. Collect the COI before the first payment, confirm the WC line and limits, and re-collect whenever it expires while the sub is still working. Match it against the dates you actually paid them.

You can pressure-test any sub in under a minute: open the free COI Gap Checker →. Enter the work dates and the COI dates, and it tells you exactly whether you’re protected or exposed — and why.

Doing this for 20 subs across a year

Checking one sub by hand is easy. Tracking dozens of certificates against dozens of payment periods, catching every mid-project lapse, is the part that breaks down — and creates the surprise bill. That’s what we’re automating. Get early access to the automated version →