Filing a lawsuit in California means the other side must get official notice, and Judicial Council Form POS-010 is the document that proves it happened. This single page tells the court who served the summons, how they served it, when it happened, and on whom — and without it, your case can stall, get dismissed, or be reset to zero.
Service mistakes are the silent killer of California lawsuits. According to a California Courts self-help service guide, more than 1 in 5 civil filings face procedural delays tied to defective proof of service, and the three-year service deadline in Code of Civil Procedure §583.210 ends cases that miss it.
Here is what you will learn in this guide:
- 📄 How to complete every line item on POS-010 without triggering rejection at the clerk’s window
- ⚖️ Which California service statute to use for each defendant type, from individuals to LLCs
- 🕒 How to calculate deadlines tied to the 60-day service rule under CRC 3.110
- 🧾 How to attach the right supporting forms like POS-015, POS-020, and POS-030
- 🚫 The seven costliest mistakes that force re-service and how to avoid them
What Form POS-010 Is and Why It Exists
Form POS-010, titled Proof of Service of Summons, is the official Judicial Council form that documents how a defendant received the Summons (SUM-100) and the complaint. The plain-English idea is simple: California courts cannot enter a judgment against someone unless the record shows that person got proper notice. That requirement comes from due process under the Fourteenth Amendment and from California’s own Code of Civil Procedure §413.10–417.40.
The consequence of skipping or botching POS-010 is severe. A judge will quash service under CCP §418.10, wipe out any default judgment, and send you back to square one. In a real example, American Express Centurion Bank v. Zara (2011) 199 Cal.App.4th 383 reversed a default judgment because the proof of service did not match the statutory method actually used.
A common misconception is that POS-010 is only paperwork. It is evidence. The signed declaration on page two is sworn under penalty of perjury, and a false entry can support a perjury charge under California Penal Code §118.
The form is mandatory in unlimited civil, limited civil, small claims appeals, family law crossover matters, and unlawful detainer cases. It is published and updated by the Judicial Council of California.
Who Can Serve and Sign POS-010
California law bars a party from serving their own papers. Under CCP §414.10, the server must be at least 18 and not a party to the action. The reasoning is neutrality: the court wants a disinterested witness to swear that delivery actually happened.
The consequence of self-service is automatic invalidation. If plaintiff Maria Lopez personally hands the summons to her ex-business partner, the service is void even if the partner admits receiving it. Maria has to start over with a friend, a process server, or the sheriff.
A registered process server gets extra legal weight. Under Evidence Code §647, a registered server’s return creates a rebuttable presumption that service was proper, which is harder for the defendant to attack. Registration is governed by Business & Professions Code §22350.
A common misconception is that any process server is “registered.” Servers who do fewer than 10 services per year are exempt from registration, and box 7e on POS-010 says exactly that. The consequence of checking the wrong registration box is a possible challenge to the presumption of valid service.
Sheriff, Marshal, or Constable Service
A sheriff or marshal can serve papers for a fee set by Government Code §26721. Their return carries the same evidentiary weight as a registered process server. The trade-off is speed: sheriffs often take longer than private servers because of caseload.
The consequence of waiting too long is missing the 60-day service deadline in California Rules of Court 3.110(b). A real example: plaintiff David Chen filed in San Diego, asked the sheriff to serve, and waited 75 days. The court issued an Order to Show Cause and threatened sanctions.
A common misconception is that the sheriff handles every case. Some counties decline civil service work or limit it to specific case types, so always check your local sheriff’s civil division.
Step-by-Step Walkthrough of POS-010
Below is a line-by-line guide. Every box on POS-010 has a consequence if filled out wrong, so treat each one as a checkpoint, not a chore.
Caption Box: Attorney, Court, and Case Information
The top caption mirrors the caption on the complaint. Enter the attorney or self-represented party’s name, State Bar number if any, address, phone, email, and the party they represent. Use the same words and spelling that appear on the complaint form to avoid clerk rejection.
The court name and street address go in the next block. Pull this directly from the court locator on the Judicial Council website. The plaintiff and defendant names must match the complaint exactly, including punctuation and “Inc.” or “LLC” suffixes.
The case number is assigned by the clerk after filing. The consequence of leaving it blank is rejection at intake. A common misconception is that you can write “TBD” — clerks will not accept it.
Item 1: Server Identification
Item 1 asks who served the documents. Print the full legal name of the server, not a nickname. If a process server is registered, list the county of registration and the registration number on later lines.
The consequence of an incomplete name is a presumption-busting defect. In Floveyor International, Ltd. v. Superior Court (1997) 59 Cal.App.4th 789, vague server identification helped a defendant attack jurisdiction. A real example: server “Bob” instead of “Robert J. Sandoval, Reg. No. 2021-15, L.A. County” invites a motion to quash.
A common misconception is that a non-registered friend cannot serve. They can — they just complete the bottom of page 2 as a non-registered, non-exempt server.
Item 2: Documents Served
Item 2 lists every document handed to the defendant. Standard items include the Summons, the complaint, the Civil Case Cover Sheet (CM-010), ADR information packets, and any Notice of Case Management Conference.
The consequence of leaving a document off Item 2 is partial service. The defendant can argue they never received the case management notice, forcing a new hearing date. A real example: plaintiff Aisha Williams forgot to list the ADR packet, and the judge continued the case management conference 60 days.
A common misconception is that “complaint” is enough. List each attachment by its title and form number.
Item 3: Party Served
Item 3 is the defendant identification line. Enter the exact name from the complaint and, in 3b, the title or capacity if served on behalf of an entity (for example, “Jane Smith, agent for service of process for Acme Logistics, LLC”). The agent for service of process for a California corporation can be confirmed through the California Secretary of State Business Search.
The consequence of misidentifying capacity is fatal. Service on a receptionist who is not the agent does not bind the corporation. In Dill v. Berquist Construction Co. (1994) 24 Cal.App.4th 1426, service on a corporation through the wrong person was quashed.
A common misconception is that service on “anyone at the office” works. It does not unless that person fits the categories in CCP §416.10 for corporations or §416.40 for unincorporated associations.
Item 4: Address Where Served
Item 4 records the physical address. Be specific: include suite number, apartment number, gate code if relevant, and city and ZIP code. The consequence of a vague address is a credibility problem at any later hearing on validity of service.
A real example: server Luis Ortega wrote “Main Street office” on Item 4. The defendant later showed three buildings on Main Street and beat the proof at a CCP §418.10 motion.
A common misconception is that a P.O. Box is acceptable for personal service. It is not. Personal service requires physical handing of the documents to a human at a physical location.
Item 5: Manner of Service
Item 5 is the heart of POS-010. The server checks one box that matches the actual method used. Each box ties to a specific California statute, and each carries different deadlines and follow-up steps.
Item 5a — Personal Service
Personal service means handing the documents directly to the defendant, governed by CCP §415.10. Service is complete the moment of delivery. List the date and time on the line provided.
The consequence of a wrong time entry is a credibility hit if the defendant claims an alibi. A real example: server Priya Patel wrote “3:00 p.m.” but the defendant produced a parking ticket from 30 miles away at the same minute. The court ordered an evidentiary hearing.
A common misconception is that the defendant must “accept” the documents. Under Trujillo v. Trujillo (1945) 71 Cal.App.2d 257, dropping the papers at the defendant’s feet after announcing the nature of the documents is sufficient.
Item 5b — Substituted Service
Substituted service under CCP §415.20 allows leaving documents with a competent adult at the defendant’s home, business, or usual mailing address (other than a USPS P.O. Box). Substituted service on an individual requires reasonable diligence first — usually three or more attempts at personal service at different times of day.
The server then mails a second set by first-class mail to the same address. Service is deemed complete on the 10th day after mailing. That extra 10 days matters for calculating the 30-day response deadline under CCP §412.20.
The consequence of skipping diligence is reversal. In Evartt v. Superior Court (1979) 89 Cal.App.3d 795, a single attempt was not enough. A real example: server Marco Bianchi tried once at 9 a.m., gave up, and used substituted service. The defendant’s motion to quash succeeded.
A common misconception is that substituted service on a corporation also requires three attempts. It does not — service on the agent’s office during normal business hours is allowed in one shot per Bein v. Brechtel-Jochim Group, Inc. (1992) 6 Cal.App.4th 1387.
Item 5c — Mail and Acknowledgment
Service by mail with notice and acknowledgment under CCP §415.30 requires sending the summons, complaint, two copies of the Notice and Acknowledgment of Receipt (POS-015), and a postage-paid return envelope. Service is complete only when the defendant signs and returns POS-015.
The consequence of a defendant ignoring the mail is wasted time. The server still has to use personal or substituted service later. Under CCP §415.30(d), a defendant who refuses without good cause may be ordered to pay the cost of the second method.
A common misconception is that any signed return works. The form must be POS-015 — a generic certified mail green card is insufficient.
Item 5d — Out-of-State Service
For defendants outside California, CCP §415.40 authorizes service by first-class mail, postage prepaid, requiring a return receipt. Service is deemed complete on the 10th day after mailing.
The consequence of using regular first-class mail with no return receipt is invalid service. A real example: plaintiff Rachel Kim mailed to a Texas defendant via standard mail. The court refused to enter default because there was no signed receipt.
A common misconception is that California’s long-arm statute makes service automatic. The plaintiff still must show minimum contacts under International Shoe Co. v. Washington (1945) 326 U.S. 310.
Item 5e — Other Manner
Item 5e covers court-ordered service, like service by publication under CCP §415.50 or posting under CCP §415.45 for unlawful detainers. Attach the court’s order and the publisher’s affidavit.
The consequence of skipping the order is fatal. A judge will not allow publication without first finding that the defendant cannot be served by other means after a diligent search.
A common misconception is that you can publish in any newspaper. The publication must run in a newspaper of general circulation most likely to give actual notice, per Government Code §6064.
Item 6: The Notice to the Person Served
Item 6 is the capacity checklist. The server marks who the defendant is — an individual, an entity under CCP §416.10, a minor, a partner, an authorized agent under CCP §416.90, or other.
The consequence of a missing or wrong checkbox is jurisdictional. In Summers v. McClanahan (2006) 140 Cal.App.4th 403, the appellate court emphasized that the Notice to the Person Served on the summons itself must mirror the capacity, but Item 6 on POS-010 is the parallel proof.
A common misconception is that this is duplicative. It is not — it is the server’s sworn statement matching the summons cover sheet.
Item 7: Server Information
Item 7 captures the server’s name, address, phone, fee, and registration status. Box 7e (registered process server), 7f (exempt under Bus. & Prof. Code §22350(b)), or 7g (employee or independent contractor of a registered process server) must be selected.
The consequence of mismatched registration is the loss of the Evidence Code §647 presumption. A real example: server Tomás Rivera worked for a registered firm but checked 7e instead of 7g. The defendant successfully argued the presumption did not apply, forcing the plaintiff to prove every element of service at hearing.
A common misconception is that fees go on the proof for collection. The fee line is informational unless the plaintiff also files a memorandum of costs (MC-010) after judgment.
Item 8: Declaration or Certificate
Item 8 has two boxes. A non-sheriff server declares under penalty of perjury under California law. A sheriff or marshal certifies under CCP §417.10(e).
The date and place of signing matter. Sign in California, write the city, and date the form the day you sign. A real example: server Hannah Becker signed “Reno, NV” on a California declaration. The court rejected it because the statute requires “under the laws of the State of California” executed in California unless the special out-of-state language is used.
A common misconception is that a digital signature is invalid. It is allowed under CCP §1010.6 when the document is e-filed.
Three Real-World Scenarios
Scenario 1: Personal Service on an Individual
| Service Step | Legal Result |
|---|---|
| Server hands summons to defendant Marcus Lee at his home at 6:15 p.m. on May 4 | Service complete May 4; defendant has 30 days to respond |
| Server completes Items 1–8 of POS-010, checks box 5a, dates and signs May 5 | Plaintiff files POS-010; case proceeds to default if no response by June 3 |
Scenario 2: Substituted Service on an LLC
| Service Step | Legal Result |
|---|---|
| Server attempts personal service on the LLC’s agent three times over four days, fails each time | Diligence is established for substituted service |
| Server leaves documents with receptionist age 18+ and mails a copy that same day | Service deemed complete 10 days after mailing under CCP §415.20 |
Scenario 3: Out-of-State Mail Service
| Service Step | Legal Result |
|---|---|
| Plaintiff mails summons and complaint by certified mail, return receipt requested, to Arizona defendant | Service deemed complete 10 days after mailing under CCP §415.40 |
| Plaintiff attaches signed return receipt to POS-010, checks box 5d, files with the clerk | Default may be sought after the response deadline expires |
Named Examples That Bring the Form to Life
Example 1 — Sofia Ramirez, Self-Represented Plaintiff. Sofia sues her former contractor for $18,000. She hires a registered process server to hand-deliver papers to the contractor at his shop. The server fills out POS-010, checks 5a, and signs as a registered server under 7e. Sofia files the form within five days using eFileCA and meets the 60-day deadline.
Example 2 — Daniel Okonkwo, Paralegal at a Mid-Size Firm. Daniel coordinates service on a Nevada LLC. He uses CCP §415.40 mail service, sends the documents certified, and gets a signed green card 12 days later. He attaches the green card to POS-010, checks 5d, and files with a Request for Entry of Default (CIV-100) once the response deadline passes.
Example 3 — Karen Whitfield, Landlord in an Unlawful Detainer. Karen tries personal service on her tenant three nights in a row with no luck. She then uses substituted service through the tenant’s adult roommate and mails a copy. She files POS-010 with box 5b checked and adds a Declaration of Diligence (POS-020) showing each attempt’s date, time, and address.
Mistakes to Avoid
- Misspelling the defendant’s name. A name mismatch lets the defendant claim the judgment is against a stranger, voiding enforcement.
- Forgetting the Civil Case Cover Sheet in Item 2. The court can reject the filing or treat the case as not properly initiated.
- Skipping reasonable diligence before substituted service. A motion to quash under CCP §418.10 succeeds, restarting the clock.
- Using a P.O. Box for personal or substituted service. Service is invalid unless it is the only known address and a court order authorizes it.
- Checking the wrong registration box in Item 7. The plaintiff loses the Evidence Code §647 presumption of valid service.
- Filing POS-010 late. Under CRC 3.110(b), filing more than 60 days after the complaint triggers an Order to Show Cause.
- Confusing dates of service and signing. Service date controls deadlines; mismatched dates create credibility problems at hearings.
- Letting a party serve the documents. Self-service voids the proof immediately under CCP §414.10.
- Failing to attach POS-015 when using mail-acknowledgment service. The defendant has no duty to respond, and service never completes.
Do’s and Don’ts
Do’s
- Do match every name, address, and case number to the complaint exactly because clerks reject mismatched filings.
- Do use a registered process server when the defendant is likely to contest service because the Evidence Code §647 presumption tilts the field in your favor.
- Do attach a Declaration of Diligence (POS-020) when using substituted service because it documents the three attempts statute requires.
- Do file POS-010 promptly because the 60-day rule under CRC 3.110 starts ticking the day you file the complaint.
- Do save signed proofs for at least the life of any judgment because the defendant can attack service years later under CCP §473.5.
Don’ts
- Don’t serve on Sundays in unlawful detainer cases because CCP §1162 and local rules can void the service.
- Don’t serve a minor without also serving a parent or guardian because CCP §416.60 requires both.
- Don’t treat email as service of the summons because email is only authorized for later filings under CCP §1010.6, not for the original summons.
- Don’t sign the declaration before service is complete because backdating supports a perjury charge under Penal Code §118.
- Don’t forget to confirm the agent for service of process through the California Secretary of State because corporate agents change often.
Pros and Cons of Each Service Method
Pros
- Personal service is the fastest because the response clock starts the day of delivery.
- Substituted service rescues cases when the defendant dodges because it allows leaving papers with a competent adult.
- Mail with acknowledgment is the cheapest because postage replaces a server fee.
- Out-of-state mail is geographically flexible because it reaches defendants anywhere in the U.S.
- Publication is a last resort that still works because it satisfies due process when defendants vanish.
Cons
- Personal service can be expensive because process server fees range from $40 to $150 per attempt.
- Substituted service adds 10 days to deadlines because mailing must follow the drop-off.
- Mail with acknowledgment depends on defendant cooperation because unsigned forms render service useless.
- Out-of-state mail requires a signed return receipt because anything less invites a motion to quash.
- Publication demands a court order and weeks of newspaper notice because CCP §415.50 requires four consecutive weeks.
Key People, Places, and Forms
The plaintiff is the party filing suit and the one who must arrange service. The defendant is the party served. The server is the neutral adult age 18 or over who delivers the documents and signs POS-010. The clerk of the superior court receives the filed proof and date-stamps it into the record. The Judicial Council of California writes and updates the form itself.
Supporting forms include the Summons (SUM-100), the Notice and Acknowledgment of Receipt (POS-015), the Declaration of Diligence (POS-020), and the Proof of Service by First-Class Mail (POS-030) for later filings.
The Department of Consumer Affairs regulates registered process servers, and county clerks maintain the registry.
Comparing the Five Service Methods
| Method | Statute | Service Complete When |
|---|---|---|
| Personal (5a) | CCP §415.10 | Date of delivery |
| Substituted (5b) | CCP §415.20 | 10th day after mailing |
| Mail with Acknowledgment (5c) | CCP §415.30 | Date defendant signs POS-015 |
| Out-of-State Mail (5d) | CCP §415.40 | 10th day after mailing |
| Publication or Other (5e) | CCP §415.50 | 28th day after first publication |
Federal Backdrop and California Nuance
Federal due process under the Fourteenth Amendment sets the floor: notice must be reasonably calculated to reach the defendant, per Mullane v. Central Hanover Bank (1950) 339 U.S. 306. The Federal Rules of Civil Procedure Rule 4 governs federal court service and looks similar but is not identical.
California layers its own rules on top. The state code is broader because CCP §415.20 allows substituted service after diligence, and California courts have liberalized the standard in cases like Espindola v. Nunez (1988) 199 Cal.App.3d 1389. The consequence for plaintiffs is more flexibility than in many other states.
A common misconception is that California rules apply in California federal court. They do not — federal court uses Rule 4, not POS-010, although the federal rule does borrow state methods.
Filing the Completed POS-010
File POS-010 with the clerk of the same superior court where the complaint sits. Most California courts now require electronic filing for represented parties under CRC 2.253 and accept it from self-represented parties through eFileCA or county portals like Los Angeles Superior Court eFiling.
The consequence of mailing the proof to the wrong county is a delay of weeks. A real example: plaintiff Olivia Brennan mailed her POS-010 to Sacramento when her case was in Placer. The court returned it without filing, and she missed her 60-day deadline.
A common misconception is that filing fees apply to POS-010 itself. Filing the proof is free; only the original complaint triggers the Government Code §70611 first-paper fee.
Recap of Key California Rulings on Service
- Summers v. McClanahan (2006) 140 Cal.App.4th 403 — strict matching of capacity on summons and proof.
- Dill v. Berquist Construction Co. (1994) 24 Cal.App.4th 1426 — improper corporate service quashed.
- American Express Centurion Bank v. Zara (2011) 199 Cal.App.4th 383 — defective POS-010 voids default.
- Bein v. Brechtel-Jochim Group (1992) 6 Cal.App.4th 1387 — substituted service on a corporate agent in one attempt allowed.
- Espindola v. Nunez (1988) 199 Cal.App.3d 1389 — liberal interpretation of substituted service after diligence.
FAQs
Is POS-010 required in every California civil case?
Yes. Every civil case where a summons issues needs a filed proof of service, and POS-010 is the Judicial Council’s mandatory form for proving the summons reached the defendant.
Can the plaintiff serve the defendant personally?
No. CCP §414.10 bars any party to the action from serving papers, so a friend, professional server, or sheriff must do it instead.
Does the server have to be a registered process server?
No. Any adult age 18 or older who is not a party may serve, but registered servers gain a stronger evidentiary presumption under California Evidence Code §647.
Is service by email valid for the summons?
No. Email service is allowed for later filings under CCP §1010.6 but not for the original summons unless a court order specifically authorizes electronic service of process.
Can substituted service happen on the first try?
No. California requires reasonable diligence for individuals, typically three personal-service attempts at different times before leaving papers with a competent adult and mailing a copy.
Does the response clock start on the date of mailing for substituted service?
No. The clock starts on the 10th day after mailing under CCP §415.20, which adds time to the defendant’s 30-day window to respond.
Can a defendant waive defects in POS-010?
Yes. A defendant who files a general appearance or answers without objecting waives most service defects under CCP §410.50, although they can still raise jurisdictional issues at trial.
Is a sheriff’s certificate stronger than a private server’s declaration?
Yes. A sheriff’s certificate carries the same statutory presumption as a registered server, and many judges give it extra weight because of the official capacity.
Does the proof need to be notarized?
No. POS-010 uses a declaration under penalty of perjury under California law, which courts accept without notarization under CCP §2015.5.
Can POS-010 be filed late?
Yes. Late filing is allowed but invites an Order to Show Cause under CRC 3.110(f), and repeated lateness can lead to dismissal or sanctions.
Is a second proof needed if the complaint is amended?
Yes. A new amended complaint that adds parties or claims requires fresh service and a new POS-010 for each newly served defendant.
Can POS-010 be used in small claims court?
No. Small claims uses Form SC-104 for proof of service, although appeals from small claims back into superior court use POS-010.
Related reading
- How to Fill Out California Form CIV-130 (w/Examples) + FAQs
- How to Fill Out California Form POS-015 (w/Examples) + FAQs
- How to Fill Out California Form POS-020 (w/Examples) + FAQs
- How to Fill Out California Form POS-030 (w/Examples) + FAQs
- How to Fill Out California Form POS-040 (w/Examples) + FAQs
- How to Fill Out California Form POS-050 (w/Examples) + FAQs
- How to Fill Out California Form CIV-010 (w/Examples) + FAQs