If you run a wedding or event venue, you've asked for a "COI" — or you're about to. It's the single most common piece of paperwork between a venue and its vendors. Here's exactly what it is, in plain language.
What COI stands for
COI stands for certificate of insurance. It's a one-page document that proves a business — a caterer, bartender, DJ, florist, photographer or rental company — carries active insurance. In the US it's almost always an ACORD 25, the standard Certificate of Liability Insurance form.
Think of it as a receipt for insurance. It doesn't provide coverage; it summarizes coverage that already exists.
What a certificate of insurance shows
Every COI lists the same core information:
| On the certificate | What it tells you |
|---|---|
| Insured | The vendor's legal business name |
| Producer | The agent or broker who issued it |
| Insurers | The carriers providing each policy |
| Coverage types | General liability, auto, workers' comp, liquor liability, etc. |
| Limits | The dollar amounts the insurer will pay |
| Policy dates | When each policy starts and ends |
| Additional insured | Whether another party is protected under the policy |
Why venues ask for one
If a vendor causes an injury or damage at your event — a guest slips on a catering spill, a rental tent collapses, a bartender over-serves — the claim can end up pointing at your venue. Requiring a COI does two things:
- It confirms the vendor actually carries liability insurance.
- When you're named as additional insured, it extends the vendor's coverage to protect your venue for claims arising from their work.
Without it, an uninsured vendor's accident can land on your policy and your renewal.
A COI is a snapshot, not a guarantee
This is the part venues miss most often. A certificate reflects coverage on the day it was issued. A policy could be cancelled, expire, or simply not list your venue. That's why it isn't enough to collect a PDF and file it — you have to read it. Three things decide whether a COI actually protects you:
- Limits meet your requirement (commonly $1M per occurrence / $2M aggregate).
- Dates cover your event date.
- Your venue is named as additional insured, not just certificate holder.
For a field-by-field walkthrough, see our guide on how to read a certificate of insurance (ACORD 25).
What this means for your venue
Say a couple's caterer sends a COI two months before the wedding. It shows $1M/$2M general liability — good. But the policy expires three weeks before the event date, and your venue isn't listed anywhere. That certificate is genuine and still useless to you. You'd ask for an updated one that covers the date and names your venue as additional insured.
Multiply that by every vendor on every event, and you can see why "just collect the COIs" quietly turns into a part-time job. Reading one is easy; tracking limits, dates and wording across dozens of vendors — and chasing the wrong ones — is where venues lose hours. That's the job COI tracking software for venues is built to do.
You can also check a vendor's COI free right now to see what a pass and a fail look like.