How to Collect (and Actually Track) Certificates of Insurance from Subcontractors
6 min read · Updated June 20, 2026
Most contractors know they should get a certificate of insurance from every sub. Far fewer have a system that survives an audit — because collecting a COI once is the easy part. The money is lost in the tracking. Here’s a system that holds up.
Why “collect it once” fails
A certificate is a snapshot of one moment. Policies expire, get cancelled for non-payment, and lapse mid-project. A COI you collected in March doesn’t prove coverage for work the sub did in July. If there’s a gap between their coverage and the dates they worked, that gap is chargeable to you. So the job isn’t “collect a COI” — it’s “prove continuous coverage across every work date.”
Step 1: Collect — before the first payment
Make a current COI (or a valid exemption) a condition of the first check, not an afterthought at audit time. Require:
- A workers’ comp line (general liability alone doesn’t exclude them).
- Adequate limits for your state/policy.
- Effective and expiration dates.
Step 2: Verify — don’t just file it
Check the three things auditors check: the WC line is present, the limits are adequate, and the dates cover the work. Here’s what makes a COI actually count → The free COI Gap Checker does this in under a minute and dollar-sizes any gap.
Step 3: Track — against work dates and renewals
This is where it breaks down. For every sub, you’re watching their coverage window against the dates you actually paid them, and re-collecting whenever a policy expires while they’re still working. One or two subs you can do by hand; twenty across a year you can’t.
The shoebox problem
At audit, a folder of certificates in no particular order is almost as bad as none — you can’t quickly prove which sub was covered for which dates. Keep them organized by sub and date so you can hand the auditor proof on demand. An audit-ready binder assembles exactly that.
Automate the nagging
The tedious part — remembering which COI expires when — is the part worth automating. The COI expiration reminder emails you before a sub’s coverage lapses, so you re-collect before it becomes a gap. Join the early-access list for the version that watches every sub all year.
General information for contractors, not insurance advice. Requirements vary by state and carrier — confirm yours.
Frequently asked questions
When should I collect a COI from a subcontractor?
Before the first payment, as a condition of starting — not at audit time. Re-collect whenever a policy expires while the sub is still working.
What should a subcontractor’s COI show?
A workers’ comp line (not just general liability), adequate limits, and effective-to-expiration dates that cover the entire period the sub worked for you.
How do I track multiple subcontractors’ COIs?
Watch each sub’s coverage window against their work dates and renewals. A COI checker, expiration reminders, and an organized binder make it manageable across many subs.
See your own exposure — free
Two free tools, no signup: estimate your audit surprise, and check whether your subs’ COIs actually protect you.
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