DocketXDocketX / Glossary / certificate of service
Certificate Of Service
A certificate of service is a written statement you file with the court to prove you properly delivered a copy of a document to the other side in your case.
What it actually is
It is a short form, often attached to or included in the document you are filing, that states when, how, and to whom you sent the document. It appears in nearly every court filing that must be shared with the opposing party, such as motions, responses, or discovery requests.
Why it matters in your case
Filing a certificate of service shows the court you followed the rules for notifying the other side, which is required for the court to consider your filing. Without it, the court may reject your document or delay your case, and the other side could claim they never received it.
The common misunderstanding
Many people think the certificate of service is the same as proof of delivery from a mail carrier, but it is simply your own sworn statement—not a receipt. Another common mistake is believing you only need to file it if you actually served the papers, but you must file it every time you send a document to the other side.
Get the actual rule
Definitions are orientation; rules are authority
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
Terms that travel with this one
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.