California Form POS-015, the Notice and Acknowledgment of Receipt – Civil, is the Judicial Council form a defendant signs and returns to confirm they received the summons and complaint by mail under California Code of Civil Procedure §415.30. To fill it out correctly, the plaintiff completes the top caption and the Notice portion, mails two copies plus a prepaid return envelope to the defendant, and the defendant dates, signs, and returns the Acknowledgment within 20 days.
Service is not legally complete until the signed POS-015 is mailed back to the sender, which means the 30-day clock to file an answer does not begin until that signature date. According to the Judicial Council of California 2024 Court Statistics Report, more than 940,000 unlimited civil cases were filed statewide in a single fiscal year, and a meaningful share of them rely on mail service through POS-015 because it is cheaper than personal service.
Here is what you will learn in this guide:
- 📬 How POS-015 works under the mail-service statute and why it shifts costs onto a defendant who refuses to sign
- 🖊️ A line-by-line walkthrough of every box, caption field, and signature block on the current Judicial Council form
- ⚖️ How POS-015 differs from POS-010, POS-030, and POS-040, and which one to pick
- 👤 Three named-defendant scenarios (debt collection, landlord-tenant, personal injury) with the exact entries to type
- 🚫 The seven most common mistakes that void service and force the plaintiff to start over
What California Form POS-015 Actually Is
California Form POS-015 is a one-page Judicial Council form titled Notice and Acknowledgment of Receipt – Civil. It is the official document a plaintiff uses to prove that a defendant received the summons and complaint through the mail rather than by personal hand delivery. The current revision is dated January 1, 2005, and it remains the controlling form in 2026 because the Judicial Council has not replaced it. You can download the fillable PDF directly from the California Courts forms library.
The form has two halves. The top half, called the Notice, is filled out by the sender (usually the plaintiff or the plaintiff’s attorney). The bottom half, called the Acknowledgment, is signed by the recipient (the defendant or the defendant’s authorized agent). Both halves must be completed for the form to function as valid proof of service.
POS-015 exists because the California Legislature wanted a low-cost alternative to a registered process server under CCP §415.20. A plain-English way to think about it is a friendly handshake by mail. The plaintiff says “I am suing you, please sign here to admit you got the papers,” and the defendant gets a small benefit (a few extra weeks) for cooperating.
The consequence of ignoring this form is severe for a defendant. Under CCP §415.30(d), a defendant who fails without good cause to sign and return the acknowledgment must pay the plaintiff’s reasonable expenses of completing personal service later, including process server fees and attorney time spent locating the defendant. A common misconception is that ignoring the mailing means the lawsuit goes away. It does not. The plaintiff simply hires a server, charges those fees back, and moves forward.
Statutory Foundation: CCP §415.30
The plain-English version of CCP §415.30 is that mail service is complete only on the date the defendant signs the acknowledgment, not the date the envelope was sent. The statute requires the sender to mail two copies of the acknowledgment plus a postage-paid return envelope addressed to the sender.
The consequence of skipping the return envelope is that service is automatically defective, even if the defendant signs anyway. A real-world example helps: imagine Maria Lopez, a small-business plaintiff suing a former contractor. If Maria forgets to enclose the prepaid envelope, opposing counsel will move to quash service under CCP §418.10 and the court will grant the motion.
A common misconception is that certified mail with a green card is the same thing. It is not. Certified mail without a signed POS-015 is not valid service of a summons in California civil court, although it may satisfy other notice rules.
Who Can Sign the Acknowledgment
For an individual defendant, only the defendant or someone the defendant has actually authorized in writing may sign. For a corporation, only an officer, general manager, or the registered agent listed with the California Secretary of State may sign.
The consequence of having the wrong person sign is that service is void, the default later entered will be vacated, and the plaintiff loses months of progress. A misconception is that a spouse or roommate can sign on behalf of the defendant. They cannot, unless there is a written power of attorney on file.
Line-by-Line Instructions for Completing POS-015
Filling out POS-015 takes about 10 minutes once you have the case caption from the filed complaint. Work top to bottom and do not skip the boxes that look optional. Every field on the form is there for a reason, and missing one can cause the clerk to reject the proof when it is later attached to a POS-010 Proof of Service or filed as its own proof.
Top Caption Box (Attorney or Party Without Attorney)
In the top-left box, type the sender’s full legal name, State Bar of California number if any, mailing address, telephone number, fax number if used, and email. If the sender is self-represented (also called in pro per), write “In Pro Per” in the State Bar Number field.
The consequence of leaving this box blank is that the court clerk cannot route the file or contact the sender, and the form may be rejected at filing. A real-world example is David Chen, a pro per landlord, who wrote only “David” with no address; the clerk returned the form unfiled, and David lost six days of his service window.
A common misconception is that the attorney box is optional for pro per filers. It is not. Self-represented parties must list themselves there exactly as they appear on the complaint.
Court Name and Branch
Below the attorney box, write the Superior Court of California, County of [County], followed by the courthouse street address, mailing address, city and ZIP, and the branch name. Match this exactly to the address printed on the issued summons. The California Courts find-my-court tool gives the official names.
The consequence of using the wrong branch name is delay. Clerks in counties like Los Angeles route filings by branch, so a Stanley Mosk filing accidentally addressed to Chatsworth will sit in an intake queue for days.
A common misconception is that “Los Angeles County Court” is acceptable shorthand. It is not. Use the formal Superior Court of California, County of Los Angeles.
Plaintiff and Defendant Names
Type the full plaintiff name and full defendant name exactly as they appear on the complaint. If there are multiple parties, you may use “et al.” after the first name, but the defendant being served must be specifically identified later in the form.
The consequence of using a nickname or shortened version is that service may not legally bind the named defendant. For example, if the complaint sues Jonathan Robert Smith but the POS-015 names John Smith, the defendant can later argue the wrong person was served.
A misconception is that adding “doing business as” (dba) names is optional. It is not optional when the dba is part of the caption on the complaint.
Case Number
Enter the case number assigned by the clerk at filing, including any prefix letters (such as 24STCV12345 in Los Angeles or CIV-SB-2400123 in San Bernardino). Double-check the number against the court’s case access portal before mailing.
The consequence of a typo here is that the proof of service, when later filed, may not attach to the correct docket. A real-world example is Priya Patel, who transposed two digits and watched her default-judgment package sit unmatched for three weeks.
A common misconception is that the case number is optional on the Acknowledgment half. It must appear on both halves.
Section 1: To (Insert Name of Individual Being Served)
In Section 1 of the Notice portion, write the name of the specific defendant being served. If serving a business, write the corporation’s full registered name and the title of the agent (for example, “Acme Corp., a California corporation, by service on Jane Doe, registered agent”).
The consequence of a vague entry is that the form does not identify whose receipt is being acknowledged. A misconception is that “Defendant” alone is sufficient. It is not.
Section 2: The Notice Paragraphs (Check the Right Boxes)
Section 2 lists the documents being served. You must check every box that applies and write in any items not pre-printed. Typical entries include:
- Summons and complaint
- Civil Case Cover Sheet (CM-010)
- Alternative Dispute Resolution information packet
- Notice of Case Assignment or Notice of Case Management Conference
- Any cross-complaint if applicable
The consequence of forgetting a document is that service of that specific document is invalid even if the rest is proper. For example, Carlos Ramirez served a complaint but forgot the cross-complaint box; the court struck the cross-complaint and he had to re-serve.
A common misconception is that the ADR packet is optional. Under California Rules of Court Rule 3.221, it must accompany the complaint in unlimited civil cases.
Sender Signature, Date, and Title
The sender signs and dates the Notice portion at the bottom of the top half. The signature must be in ink (a typed or “/s/” signature is not enough on the mailed copies). Print the name and title beneath the signature line.
The consequence of an unsigned Notice is that the entire mailing is treated as a nullity. A misconception is that emailing a PDF copy with a typed signature satisfies the rule. It does not for traditional mail service under §415.30.
Section 3 and 4: The Acknowledgment Portion
The defendant fills out the bottom half. The defendant prints their name, indicates the capacity in which they are signing (individually, as agent for a business, etc.), enters the date of receipt, and signs in ink. If signing as an agent, the agent must list the entity name and the agent’s title.
The consequence of leaving the date blank is that the 30-day answer clock under CCP §412.20 cannot start, and the plaintiff cannot lawfully take a default. A misconception is that backdating helps the defendant gain time. It does not, and it can be charged as fraud on the court under Penal Code §132.
Three Named Examples That Show POS-015 in Action
Real scenarios make the form click. Below are three realistic fact patterns drawn from common California civil filings, each ending with the exact entries that go on POS-015. Names are illustrative.
Example 1: Debt Collection Case — Maria Lopez v. Anthony Brooks
Maria, a sole proprietor, sued former client Anthony Brooks for an unpaid $18,400 invoice in Los Angeles Superior Court. She mailed Anthony two copies of the summons, complaint, civil case cover sheet, and ADR packet, plus a prepaid return envelope. Maria typed “Anthony Brooks” in Section 1 and checked the boxes for Summons, Complaint, Civil Case Cover Sheet, and ADR Information.
The consequence of Anthony signing and returning the form on day 12 is that service was complete on that signature date and his answer was due 30 days later. The misconception Anthony almost fell for was thinking that signing meant admitting the debt. It did not. Signing only acknowledges receipt of the papers, not the merits, as confirmed by the form’s printed disclaimer language and by the rule discussed in Thierfeldt v. Marin Hospital Dist. (1973) 35 Cal.App.3d 186.
Example 2: Landlord-Tenant Breach — David Chen v. Sunset Holdings, LLC
David sued his commercial landlord for a security deposit dispute. Because Sunset Holdings is an LLC, David needed to mail to the registered agent for service of process, which he found through the Secretary of State business search. He typed “Sunset Holdings, LLC, a California limited liability company, by service on Rebecca Nguyen, agent for service of process” in Section 1.
The consequence of mailing only to the LLC’s mailing address (and not the agent) would be void service under Corporations Code §17701.16. A misconception is that an LLC manager can always sign POS-015. The manager can sign only if listed as the agent or if a written designation exists.
Example 3: Personal Injury — Priya Patel v. Jonathan Smith
Priya sued Jonathan after a fender-bender in San Diego. Jonathan’s insurance carrier asked him to sign the POS-015 within five days so the carrier could place its duty to defend on file. Jonathan dated the form, signed in ink, and mailed it back the same week.
The consequence of his prompt signature was that the 20-day cost-shifting trigger under CCP §415.30(d) never activated. A misconception was that signing waived his right to challenge venue. It did not. Jonathan still filed a motion to transfer venue under CCP §397 because the form acknowledges receipt only.
Three Common Scenarios on the POS-015 Path
Below are three two-column scenario tables that show what happens on the ground. Each row is a discrete event and its legal consequence under California civil practice.
Scenario A — Defendant Signs and Returns Within 20 Days
| Defendant Action | Legal Consequence |
|---|---|
| Receives mailed POS-015 packet on Day 1 | Service not yet complete; no answer deadline running |
| Signs and dates the Acknowledgment on Day 12 | Service complete on Day 12 under CCP §415.30(c) |
| Mails signed form back the same day | Plaintiff records that signature date as service date |
| Files Answer or demurrer 30 days later | Pleading is timely; default cannot be taken |
| Keeps copy of envelope and tracking | Preserves proof if signature date is later disputed |
Scenario B — Defendant Refuses to Sign
| Defendant Action | Legal Consequence |
|---|---|
| Receives packet, decides to ignore it | 20-day window under §415.30(d) begins ticking |
| Day 21 passes with no return | Plaintiff may hire a registered process server |
| Process server personally serves defendant | Service complete on personal-service date |
| Plaintiff files cost motion | Defendant ordered to pay process server fees |
| Defendant still owes 30-day answer clock | Default risk now elevated |
Scenario C — Wrong Person Signs the Form
| Sender Action | Legal Consequence |
|---|---|
| Mails packet to defendant’s home | Spouse signs and returns form |
| Plaintiff files signed POS-015 with court | Apparent service complete |
| Plaintiff takes default 35 days later | Default entered by clerk |
| Defendant moves to set aside default | Court grants motion under CCP §473.5 |
| Plaintiff must re-serve correctly | Months of progress lost |
How POS-015 Compares to Other Service Forms
California uses a family of Judicial Council forms for service of process, and using the wrong one is one of the top reasons clerks reject filings. The four most common civil service forms are POS-015, POS-010, POS-030, and POS-040. Each one fits a specific service method and case posture, and choosing correctly protects the lawsuit from a motion to quash.
| Form | Title and Use | When to Use It |
|---|---|---|
| POS-015 | Notice and Acknowledgment of Receipt – Civil under §415.30 | Mailing summons and complaint to a willing defendant |
| POS-010 | Proof of Service of Summons | Documenting personal, substituted, or mail service of the summons |
| POS-030 | Proof of Service by First-Class Mail – Civil | Serving documents other than the summons after appearance |
| POS-040 | Proof of Service – Civil | Multi-method proof for documents after the case is underway |
The consequence of swapping POS-015 for POS-030 is that the summons itself never gets validly served, because POS-030 covers post-appearance papers like motions and discovery. A misconception is that any “proof of service” form will do once a defendant has notice. The Judicial Council and the California Rules of Court Rule 1.31 treat each form as form-specific and not interchangeable.
When POS-015 Is the Wrong Choice
POS-015 cannot be used when the defendant is outside California unless the defendant agrees in writing, and it cannot be used for unlawful detainer (eviction) cases because eviction has its own expedited service rules under CCP §1166. It is also not the right vehicle for serving a small claims plaintiff’s claim (SC-100), which uses SC-104 instead.
The consequence of using POS-015 in an eviction is automatic dismissal of the unlawful detainer or a granted motion to quash. A misconception is that mail service is always cheaper and therefore preferred. In a five-day eviction timeline, mail service simply does not work.
When POS-015 Is the Right Choice
POS-015 is ideal when the defendant is in California, cooperative, and easy to reach by mail, such as a former business partner, a known former tenant in a contract case, or a corporate registered agent. It also works well when the plaintiff wants to save money on a process server while preserving the right to recover those costs if the defendant refuses.
Mistakes to Avoid When Using POS-015
The following errors come up repeatedly in published opinions and clerk-rejection letters across California superior courts. Each one has a specific negative outcome attached.
- Mistake 1: Forgetting the prepaid return envelope. Service is void under CCP §415.30(a) and the case stalls until proper re-mailing.
- Mistake 2: Mailing only one copy of the acknowledgment. The statute requires two copies; one for signature and one for the defendant’s records, so a single-copy mailing fails the statute.
- Mistake 3: Having the sender sign the bottom half. The Acknowledgment must be signed by the defendant; a sender signature there is a fabrication.
- Mistake 4: Backdating the signature. This is fraud on the court and can be sanctioned under CCP §128.7.
- Mistake 5: Mailing to the wrong corporate agent. Service on a non-agent voids the proof and requires fresh service on the registered agent.
- Mistake 6: Skipping the ADR packet. Rule 3.221 requires it; missing it is a ground to challenge service.
- Mistake 7: Filing POS-015 before it is signed. A blank acknowledgment is not proof of anything and the clerk will reject it.
- Mistake 8: Mailing from a non-party who is also a witness. The mailer must be over 18 and not a party, mirroring the rule for proofs of service generally.
- Mistake 9: Using an outdated form revision. Always pull the latest PDF from the California Courts forms page.
- Mistake 10: Failing to keep proof of mailing. Without a certificate of mailing the date of dispatch cannot be proven if challenged.
Do’s and Don’ts for POS-015
A short, action-oriented checklist helps both plaintiffs and defendants stay on the right side of the rule. Each point includes the why behind it.
Do’s
- Do mail two copies and a prepaid return envelope, because §415.30 makes that the entire basis of valid service.
- Do keep a USPS Certificate of Mailing so the dispatch date is provable later.
- Do verify the defendant’s correct legal name on the complaint, because mismatches invite motions to quash.
- Do confirm a corporate agent through the Secretary of State portal, since stale agent data is common.
- Do calendar Day 20 from mailing, because that triggers cost-shifting under §415.30(d).
Don’ts
- Don’t use POS-015 for an unlawful detainer, because the expedited eviction statute does not allow it.
- Don’t mail to a P.O. box if you are unsure the defendant checks it, because actual receipt drives the timeline.
- Don’t sign as the defendant for a friend, because that voids service and exposes the signer to liability.
- Don’t combine POS-015 with POS-030 on the same mailing, because the forms cover different documents.
- Don’t forget to file the signed POS-015 with the court, because unfiled proofs do not start any clock for the clerk.
Pros and Cons of Using POS-015
Mail service through POS-015 has clear advantages and real risks. Weigh both before choosing it over a registered process server.
Pros
- Lower cost than personal service, because postage is far cheaper than a process server fee, which often runs $75–$150.
- Cost recovery if the defendant refuses, because §415.30(d) shifts those expenses.
- Less confrontation, because there is no in-person encounter at the door.
- Self-documenting, because the signed form is the proof of service.
- Statewide reach, because California Post Office delivery covers every county the same way.
Cons
- Slower when the defendant delays signing, because service is not complete until signature.
- Voidable if any technicality is missed, because courts strictly construe §415.30.
- Useless against evasive defendants, because nothing forces a signature.
- Limited to in-state cooperative defendants, because out-of-state service usually requires §415.40 procedures.
- Risk of identity errors, because the wrong person can sign and create a defective record.
Filing the Signed POS-015 With the Court
Once the defendant returns the signed form, the plaintiff files it with the court clerk to put proof of service on the docket. Most California superior courts accept e-filing through providers like File & ServeXpress or One Legal, and counties such as Los Angeles and Orange require e-filing for represented parties under Code of Civil Procedure §1010.6.
The consequence of forgetting to file the signed form is that the court has no record service occurred. A misconception is that the signed acknowledgment automatically updates the docket. It does not; someone must affirmatively file it. A real-world example is Carlos Ramirez, who held the signed POS-015 in a folder for two months while waiting for an answer; when he finally tried to take a default, the clerk refused because no proof of service was on file.
After filing, calendar the 30-day response window that runs from the signature date. If no response arrives, the next step is a Request for Entry of Default (CIV-100) under CCP §585.
Key Court Rulings That Shape POS-015 Practice
Several California decisions explain how courts read §415.30 and the POS-015 form. In Thierfeldt v. Marin Hospital Dist. (1973) 35 Cal.App.3d 186, the court reinforced that service by mail under the predecessor statute is complete only on the date the defendant signs, not the date of mailing. That principle controls modern POS-015 practice.
In Dill v. Berquist Construction Co. (1994) 24 Cal.App.4th 1426, the court emphasized that mail service on a corporation must reach a person statutorily authorized to receive process, a point that maps directly to who can sign Section 4 of POS-015. The consequence of ignoring Dill is a granted motion to quash.
In M. Lowenstein & Sons, Inc. v. Superior Court (1978) 80 Cal.App.3d 762, the court underscored that strict statutory compliance is required for mail service because it is a substitute for traditional personal service. A misconception is that “substantial compliance” cures small errors. California courts generally do not accept that argument under §415.30.
State Nuances: Federal Cases Filed in California
If the case is in federal court in California, POS-015 is not the right form. Federal civil cases use Federal Rule of Civil Procedure 4(d), which provides for waiver of service through forms AO 398 and AO 399. The federal waiver mirrors POS-015 in spirit but uses different deadlines (30 days to return, 60 days to answer if returned).
The consequence of using POS-015 in a federal case is that service is invalid in federal court even if perfectly executed for state purposes. A misconception is that a state-court POS-015 can be re-filed in a removed federal case to cover the gap. It cannot. After removal under 28 U.S.C. §1446, federal service rules apply going forward.
A real-world example is a contract case originally filed in San Francisco Superior Court, served via POS-015, then removed by the defendant on diversity grounds. The state-court service remains valid for everything that happened before removal, but any new parties added in federal court need an AO 399 waiver or formal Rule 4 service.
Frequently Asked Questions
Is POS-015 the same as a Proof of Service of Summons (POS-010)?
No. POS-015 is the Notice and Acknowledgment of Receipt used for mail service under §415.30, while POS-010 documents personal, substituted, or other service methods of the summons.
Does signing POS-015 mean I admit the lawsuit’s allegations?
No. Signing only acknowledges receipt of the papers; it never admits the underlying facts or liability and the form itself includes that disclaimer in plain language.
Can I be served with POS-015 if I live outside California?
No. Out-of-state defendants generally must be served under CCP §415.40 by certified mail with return receipt, unless they consent in writing to POS-015.
Will I owe extra money if I refuse to sign POS-015?
Yes. Under §415.30(d), a defendant who refuses without good cause must reimburse the plaintiff’s reasonable expenses of completing personal service later.
Do I have 20 or 30 days to respond after signing?
Yes, you have 30 days to file a response, measured from the date you sign the Acknowledgment, under CCP §412.20.
Can a corporation be served using POS-015?
Yes. A California corporation may be served by mailing POS-015 to an officer, general manager, or the registered agent for service of process.
Must the plaintiff include a self-addressed stamped envelope?
Yes. The statute requires a postage-prepaid return envelope addressed to the sender, and missing it voids the service.
Can POS-015 be used in unlawful detainer (eviction) cases?
No. Eviction service is governed by CCP §1166 and other expedited rules that do not permit acknowledgment-of-receipt mail service.
Is electronic signature acceptable on POS-015?
Yes, but only when both parties have agreed to electronic service under CCP §1010.6 and the court permits it; otherwise an ink signature is required.
Can my spouse sign POS-015 for me?
No. Only the named defendant or a person the defendant has authorized in writing may sign, and a signature by a spouse without that written authority makes service void.
Does POS-015 have to be notarized?
No. California does not require notarization of POS-015; the signed acknowledgment itself satisfies the proof requirement under §415.30.
What happens if I lose the signed POS-015 before filing it?
Yes, you have a problem; you must request a duplicate signed copy from the defendant or repeat service, because an unsigned or missing acknowledgment provides no proof under the statute.
Related reading
- How to Fill Out California Form FL-335 (w/Examples) + FAQs
- How to Fill Out California Form POS-010 (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