Fill out Form POS-010, Proof of Service of Summons with Instafill.ai

Users often mistype the case number or misspell the names of the plaintiff or defendant in the header section. This error can occur from simple typos or by copying information from an outdated draft. An incorrect case number can cause the proof of service to be filed in the wrong case or rejected by the court clerk, while incorrect party names can give the defendant grounds to challenge the service's validity, causing significant delays.

A frequent error is entering the name of the individual who received the papers (e.g., a receptionist) in section 3a, which is reserved for the legal party named in the lawsuit (e.g., 'ABC Corporation'). Section 3b is the correct place for the individual's name and relationship. This mistake can invalidate service against the intended corporate or entity defendant, as it fails to properly identify who was legally served. To avoid this, the official defendant name from the complaint must be in 3a.

Substituted service (Section 5b) is complex and often done incorrectly. Servers frequently forget that they must both leave the documents with a qualified person AND mail a separate copy to that same address. A common failure is neglecting to fill in the mailing date in 5b(4) or, critically, failing to attach the required 'declaration of diligence' (5b(5)) that proves personal service was attempted first. Any one of these omissions makes the service defective and subject to being thrown out by the court.

Section 6 specifies the capacity in which the defendant was served, which is crucial when serving a business. A major error is serving a corporate officer but checking box 6a ('as an individual defendant') instead of 6d ('On behalf of') and selecting the appropriate Code of Civil Procedure section (e.g., 416.10 for a corporation). This mistake means the business entity itself was not properly served, which can nullify the service and force the plaintiff to start over.

The declaration in Section 8 must be signed by the person who actually performed the service and whose information is listed in Section 7. It is a serious and common error for an attorney, paralegal, or supervisor to sign the form when they did not personally deliver the documents. This constitutes a false declaration under penalty of perjury and renders the proof of service void. The name in Section 7 must always match the signature.

The signature date must be on or after the final act required for service. For substituted service, this means the form cannot be dated and signed until after the follow-up copy has been mailed (the date in 5b(4)). Signing the form before all steps are complete, or simply forgetting to enter a date, are common oversights that create a defect in the proof of service and can be used to challenge its validity.

The form header clearly states, '(Separate proof of service is required for each party served.)' Despite this warning, filers sometimes try to list multiple defendants on one form or serve several parties but only file a single proof. This procedural error will result in the court only recognizing service for the one party properly documented, leaving the other defendants legally un-served and potentially leading to a partial dismissal.

In Section 2, the server must check a box for every single document that was delivered to the defendant. People often forget to check a required item, such as the 'ADR package,' or fail to specify all documents when using the 'other' category. If a document was served but not indicated on the proof, there is no legal evidence it was provided, which can cause disputes and force a re-service of the missing papers.

Section 7 requires the server to declare their status (e.g., not a registered process server, exempt, or registered). If the server is a registered California process server, they must provide their registration number and county. This section is frequently left incomplete, especially by individuals who serve papers infrequently and are unsure of their status. This omission can lead to the form being scrutinized or rejected by the clerk for being incomplete.

Many court forms are distributed as flat, non-fillable PDFs, which can lead to illegible handwritten entries or formatting problems when people try to type over the lines. These issues can cause a court clerk to reject the filing. AI-powered tools like Instafill.ai can prevent this by converting the non-fillable PDF into an interactive, fillable version, ensuring all data is entered clearly, legibly, and in the correct fields.