# What is a certificate of insurance? > A certificate of insurance is a one-page proof that a policy exists, issued by an agent. What it shows, what it does not, and why clients ask for it. Source: https://learn.ynteractive.com/content/glossary/certificate-of-insurance · Updated 2026-10-02 · Free from Stepthrough (https://learn.ynteractive.com) [Business](https://learn.ynteractive.com/content/glossary#topic-business) · [AI glossary](https://learn.ynteractive.com/content/glossary) Quick answer A certificate of insurance, or COI, is a standard one-page document issued by an agent or carrier that summarizes a business's coverage: who is insured, which policies exist, their limits and dates, and who asked for proof. It confirms a policy exists but does not change it. Last updated October 2, 2026 Updated October 2, 2026 · By [Robert Breen](https://learn.ynteractive.com/content/about) ## Why it matters for a small business Clients, landlords and general contractors often require a COI before work begins, because it shows you can cover a loss and not leave them exposed. Agencies field these requests constantly, and a fast, correct turnaround is part of good service. The certificate is a summary, not the policy. It generally can't add coverage, extend it or override the policy's terms, and the wording is usually written to say so. If a customer needs to be named as an additional insured, that is a change to the policy, not a line on the certificate. Ask your agent how it works for your policies. ## In a real lesson: Reply Faster to Claim-Status Emails: ChatGPT for Independent Insurance Agencies The [Reply Faster: Claim-Status Emails lesson](https://learn.ynteractive.com/content/chatgpt-reply-claim-status-emails-insurance-agency) is about a personal auto claim, not certificates, so no COI appears in it. It does show the small-agency setting where certificate requests arrive. Tom works at Stonebridge Insurance Agency, a made-up independent agency, and writes to a client, Denise, about her claim with the carrier, Harbor Mutual. The agency's own rule in the lesson is a good model for answering certificate requests too: it explains what the policy shows and who decides, and never promises payment dates, amounts, coverage decisions or rates on the carrier's behalf. A COI request should be handled the same way, showing what the policy says and leaving coverage decisions to the carrier. Use the lesson's habit: gather the facts first, then draft, then check each statement against them. For a certificate, the facts would be the policy details, which only a licensed professional can confirm. [Try this lesson free](https://learn.ynteractive.com/modules/insurance-claim-status-reply) or [read the step-by-step guide](https://learn.ynteractive.com/content/chatgpt-reply-claim-status-emails-insurance-agency). ## Common confusions ### Certificate vs policy The policy is the contract. The certificate is a snapshot of it, handy for sharing. If the two ever differ, the policy controls. ### Certificate vs declarations page The [declarations page](https://learn.ynteractive.com/content/glossary/declarations-page) belongs to the policyholder and lists the details of one policy. A certificate goes to a third party and summarizes coverage for them. ## Tips - Ask the requester for the exact wording they need, such as the names and limits, before you order the certificate. - Check the policy dates. An expired certificate is worse than none. - Have a licensed agent issue and review certificates. AI can help draft the request email, not the certificate. ## Related terms [Declarations page](https://learn.ynteractive.com/content/glossary/declarations-page) · [Policy endorsement](https://learn.ynteractive.com/content/glossary/policy-endorsement) · [Deductible](https://learn.ynteractive.com/content/glossary/deductible) · [Claims adjuster](https://learn.ynteractive.com/content/glossary/claims-adjuster) · [Client status update](https://learn.ynteractive.com/content/glossary/client-status-update) · [Liability coverage](https://learn.ynteractive.com/content/glossary/liability-coverage) ## More Business terms [Change management](https://learn.ynteractive.com/content/glossary/change-management) · [Change order](https://learn.ynteractive.com/content/glossary/change-order) · [Chart of accounts](https://learn.ynteractive.com/content/glossary/chart-of-accounts) · [Client portal](https://learn.ynteractive.com/content/glossary/client-portal) ## Where you use it: free lessons - [Reply Faster to Claim-Status Emails: ChatGPT for Independent Insurance Agencies](https://learn.ynteractive.com/content/chatgpt-reply-claim-status-emails-insurance-agency) (ChatGPT, 10 min) - [Reply Faster: Turn a Messy Customer Email Thread into a Clear, Friendly Reply](https://learn.ynteractive.com/content/chatgpt-reply-to-customer-emails) (ChatGPT, 9 min) ## Frequently asked questions **Does a certificate prove I am covered for a loss?** It proves a policy was in force when issued. Whether a particular loss is covered is decided under the policy by the carrier. **How long does a certificate take?** Often the same day for a standard one, but timing depends on the agency and the carrier. Ask your agent. [All AI glossary terms, A to Z](https://learn.ynteractive.com/content/glossary) · [Free prompt templates](https://learn.ynteractive.com/content/prompts)