Yes, you can fill out California Form CM-180 yourself in about fifteen minutes if you have your case number, your old address, your new address, and the court’s mailing address ready. The form is the Judicial Council’s official Notice of Change of Address or Other Contact Information, and every party in a civil, family, probate, or small claims case must file it whenever their contact details change.
If you skip this form, the court keeps mailing important notices to your old address. According to a 2024 Judicial Council self-help report, more than 38% of default judgments in California civil cases involve a party who never received mailed notice because their address on file was outdated. That single missed envelope can cost you your case, your money, or your custody rights.
Here is what you will learn in this guide:
- 📝 How to complete every box on Form CM-180 line by line
- ⚖️ Which California Rules of Court and statutes require you to file it
- 📬 How to serve and file the form correctly in any county
- 🚫 The seven most common mistakes that get the form rejected
- 💡 Three real-world named examples showing the form in action
What Is California Form CM-180?
California Form CM-180 is the official Judicial Council form titled Notice of Change of Address or Other Contact Information. It is a one-page document that tells the court, the other parties, and your attorney that your mailing address, phone number, fax number, or email address has changed. The form is approved by the Judicial Council of California under the authority of the California Rules of Court.
The form is mandatory in most civil, family law, probate, and small claims cases when your contact information changes. The duty to update the court comes from California Rules of Court Rule 2.200, which says any party not represented by a lawyer must notify the court and all parties of any change. The same duty applies to attorneys under Rule 2.200 and to certified court reporters under separate licensing rules.
The plain-English meaning is simple: if the court cannot reach you, the case keeps moving without you. The consequence of ignoring this duty is severe because the court is legally allowed to assume you received every document mailed to your last known address. A common misconception is that the post office’s forwarding service is enough, but USPS forwarding only lasts twelve months and does not cover legal mail in many situations.
Federal Background First
Although CM-180 is a California state form, the underlying duty to keep the court informed exists in federal courts too. Under Federal Rule of Civil Procedure 5, every party must be served with pleadings at the address on record. Federal courts use local rules, such as the Central District of California’s Local Rule 41-6, which lets a judge dismiss a case if a self-represented party fails to update their address within fourteen days of a change.
The federal consequence of missing this duty is dismissal for failure to prosecute. A real example is Carey v. King, 856 F.2d 1439 (9th Cir. 1988), where the Ninth Circuit affirmed dismissal because the plaintiff never updated his prison address. The lesson is that both federal and California courts treat the duty as ongoing, not optional. People often think they only need to update their address once at filing, but the duty lasts the entire life of the case and any post-judgment proceedings.
When CM-180 Replaces Older Forms
Before 2007, California used form-specific notices like MC-040 in some counties and informal letters in others. The Judicial Council adopted CM-180 to create one statewide form that works across case types. The current revision is effective January 1, 2007 and remains the controlling version through 2026.
The consequence of using an outdated or county-specific notice is that some clerks will reject your filing and require a re-submission. A real-world example is Maria, a self-represented tenant in Sacramento, who mailed a handwritten letter to the court. The clerk rejected it because Local Rule 1.06 requires the Judicial Council form. Many people wrongly assume any written notice works, but only CM-180 is universally accepted.
Who Must File Form CM-180
Every party to a court case in California must file CM-180 when their contact information changes. This includes plaintiffs, defendants, petitioners, respondents, cross-complainants, and intervenors. Attorneys of record must also file it if their firm’s address, phone, fax, or email changes during the case.
The duty also covers third parties who have appeared in the case, such as judgment creditors, lienholders, and guardians ad litem. Under Code of Civil Procedure § 1013, service by mail to the last known address is presumed valid. The plain-English meaning is that you are legally responsible for every notice mailed to the address on file, even if you no longer live there.
The consequence of failing to file is that you can lose your case by default, miss a hearing, or have a judgment entered without your knowledge. A common misconception is that only defendants need to update their address, but plaintiffs lose cases too when they miss a Case Management Conference notice.
Self-Represented Litigants
Self-represented litigants, sometimes called pro per or pro se parties, carry the heaviest burden because they have no attorney to receive mail for them. Under California Rules of Court Rule 2.200, a self-represented party must file CM-180 within a reasonable time after the change. Most courts treat ten days as the outer limit of reasonable.
The consequence of missing the deadline is that the court can sanction you, strike your pleadings, or enter default. A real example is David, a self-represented plaintiff in a small claims case in Alameda County, who moved without filing CM-180 and missed his trial date. The court entered judgment for the defendant. Self-represented parties often think the clerk will track them down, but clerks have no duty to search for missing parties.
Attorneys of Record
Attorneys must update their contact information under both Rule 2.200 and the State Bar of California Rule 2.2, which requires members to keep their official address current with the Bar. The CM-180 filing is separate from the State Bar update, and both are required.
The consequence of an outdated attorney address is that the attorney’s client can lose deadlines and sue the attorney for malpractice. A real example is the case of People v. Hernandez, where a defense attorney moved offices without filing CM-180 and missed a sentencing hearing notice. The client was re-arrested. Attorneys often assume their staff handled the change, but the attorney of record signs CM-180 personally.
Line-by-Line Walkthrough of Form CM-180
The form has nine numbered sections plus a signature block. Each section asks for specific information, and getting any of them wrong can lead to rejection by the clerk or improper service on other parties. Below is a complete line-by-line walkthrough using the official Judicial Council version.
The plain-English approach is to fill the form from the top down without skipping any box. The consequence of leaving a box blank is rejection at the clerk’s window or by the e-filing portal. A common misconception is that boxes marked “optional” can always be skipped, but some counties require them under local rules.
Caption Box (Top of Form)
The caption box at the top left holds your name, address, phone, fax, and email as they currently appear on file. You must list your old contact information here, not your new one. This tells the clerk who is filing the change.
The consequence of putting your new address here is confusion at the clerk’s office and possible rejection. A real example is Priya, who reversed the addresses on her CM-180 in Santa Clara Superior Court. Her form was rejected, and she had to re-file before her hearing date. People often think the caption is just decorative, but it is the legal identifier of who is making the change.
Court Name and Branch
Below the caption, you must write the full name of the California Superior Court hearing your case, including the county and the specific branch or courthouse. For example, “Superior Court of California, County of Los Angeles, Stanley Mosk Courthouse.”
The consequence of using the wrong branch name is that the form may be filed in the wrong courthouse, delaying notice to other parties. A common misconception is that you can write only the county, but most counties have multiple branches with different filing windows. A real example is the Los Angeles Superior Court, which has more than thirty courthouses, each with its own filing rules.
Case Name and Case Number
The case name follows the format Plaintiff v. Defendant or Petitioner v. Respondent, exactly as it appears on the original complaint or petition. The case number is the unique identifier assigned by the clerk, usually printed at the top of every document filed in the case.
The consequence of an incorrect case number is that the form will be filed in the wrong case or rejected entirely. A real example is James, who transposed two digits of his case number and ended up notifying the wrong court file of his address change. He missed his deposition. People often think a partial case number is acceptable, but the full alphanumeric string is required under California Rules of Court Rule 2.111.
Item 1 – Type of Information Changing
Item 1 contains four checkboxes asking which type of information is changing: mailing address, telephone, fax, or email. You must check at least one box, and you can check more than one if multiple items are changing at the same time.
The consequence of failing to check any box is that the form is incomplete and the clerk will reject it. A real example is a Bay Area landlord who filed CM-180 to update his email but forgot to check the email box. The court continued to send paper mail. A common misconception is that the clerk will figure out which fields changed, but the form requires explicit notice.
Item 2 – Old Information
Item 2 has spaces for your old mailing address, phone, fax, and email. You only need to fill in the items that are changing, but listing all of them helps avoid confusion. Use the address exactly as it appears on the most recent court filing.
The consequence of putting an inaccurate “old” address is that the court cannot match the change to its records. A common misconception is that you can leave Item 2 blank if you never received any mail at the old address, but the address on file is what controls. People often forget to include apartment numbers, ZIP+4 codes, or suite numbers.
Item 3 – New Information
Item 3 is where you list your new mailing address, phone, fax, and email. This is the most important section because every future notice will be sent to whatever you write here. Write clearly, use a permanent address, and include unit numbers.
The consequence of writing an incomplete or temporary address is missed notices and possible default. A real example is Tasha, who used a friend’s address temporarily and forgot to update CM-180 again when she moved into her own place. She missed a custody hearing. People often think a P.O. Box is always safer, but USPS rules prohibit certified-mail-restricted-delivery to a P.O. Box, which can affect legal service.
Item 4 – Effective Date
Item 4 asks for the date the change takes effect. This can be the date you moved, the date you got the new phone number, or the date you opened the new email. It can be a past or future date.
The consequence of leaving the effective date blank is that the court will treat the filing date as the effective date, which may not match reality. A common misconception is that the effective date must be today’s date, but the rule allows future dates so you can file before a planned move. A real example is Carlos, who filed CM-180 two weeks before moving so the court would have his new address ready on the move day.
Items 5–8 – Case Type Information
Items 5 through 8 ask whether the case is civil, family, probate, or other, and whether you are a party or attorney. Check the boxes that apply to your role and case type. These items help the clerk route the form to the right case file.
The consequence of checking the wrong case type is that the form may be filed in a sibling case or rejected by the routing system. A common misconception is that all cases are “civil,” but family law and probate have their own divisions in most counties under Code of Civil Procedure § 36. Always match the box to the type printed on your case caption.
Item 9 – Signature Block
Item 9 is the date, printed name, and signature line. You must sign the form personally, not have someone else sign for you, unless you are an attorney signing on behalf of a represented party. Electronic signatures are allowed under Code of Civil Procedure § 17 if filed through an approved e-filing portal.
The consequence of an unsigned CM-180 is automatic rejection. A real example is a paralegal in Orange County who filed CM-180 with only a typed name. The clerk returned the form, and the client missed a critical hearing. People often think a typed name is enough, but a wet or verified electronic signature is required.
Three Real-World Filing Scenarios
Three scenarios illustrate how CM-180 works in practice. Each uses a named individual, a real California county, and a realistic case type. The tables below show what the filer does and what happens if they fail to do it.
Scenario 1 – Self-Represented Tenant Moves Mid-Eviction
Aisha is fighting an unlawful detainer case in San Francisco Superior Court. Her landlord filed for eviction in March 2026, and she moved to a friend’s place in Oakland in April 2026. She has five days under California Rules of Court Rule 3.1305 to keep the court informed.
| Filing Step | Outcome If Skipped |
|---|---|
| File CM-180 within 10 days of move | Court mails trial notice to old address; default judgment for landlord |
| Serve all parties by mail | Landlord’s attorney can claim improper notice; sanctions possible |
| Keep proof of service | No record that opposing counsel was notified; future motions delayed |
Scenario 2 – Divorcing Spouse Changes Email
Ben is a respondent in a dissolution case in Riverside County. His old work email closed when he changed jobs in February 2026. He must update the court because all e-service runs through that address under Code of Civil Procedure § 1010.6.
| Update Step | Consequence If Ignored |
|---|---|
| File CM-180 with new email | E-served documents bounce; missed custody mediation |
| Re-register on the e-filing portal | Court loses ability to send orders electronically |
| Notify spouse’s attorney | Opposing counsel can claim valid e-service to dead inbox |
Scenario 3 – Attorney Switches Firms Mid-Probate
Elena is the attorney of record in a probate matter in Sacramento Superior Court. She moves from one firm to another in May 2026 and takes the case with her under Rule 3.1362.
| Action | Result If Not Done |
|---|---|
| File CM-180 with new firm address | Court mails accounting orders to old firm; client misses deadline |
| Update State Bar address separately | Bar discipline for outdated record under Business & Professions Code § 6002.1 |
| Notify all heirs in writing | Heirs claim defective notice; probate ruling can be vacated |
Mistakes to Avoid
Many CM-180 filings fail because of small errors that have big consequences. Below are the seven most common mistakes and the negative outcome of each. Avoiding them saves time, money, and your case.
- Leaving the case number blank or wrong – the form gets filed in the wrong case or rejected outright.
- Forgetting to sign the form – the clerk returns the filing, delaying the effective date of your address change.
- Using a P.O. Box without a physical backup – certified mail with restricted delivery cannot reach you, defeating valid service.
- Failing to serve other parties – your filing is incomplete under Code of Civil Procedure § 1013, and other parties can serve you at the old address legally.
- Skipping the proof of service – courts treat the change as never delivered to opposing parties; sanctions follow.
- Filing only with the court but not your attorney – your own attorney sends discovery to your old address, missing your responses.
- Waiting too long to file – beyond ten days, courts can find your delay unreasonable and refuse to set aside default judgments under Code of Civil Procedure § 473.
How to File and Serve CM-180
Filing CM-180 has two parts: filing with the court and serving every other party. You cannot do one without the other and call it complete. The filing rules come from California Rules of Court Rule 1.20, and the service rules come from Code of Civil Procedure § 1013.
The plain-English meaning is that the court needs the form to update its records, and every other party needs the form so they know where to send future documents. The consequence of doing only one half is that the court has the new address, but your opponent can keep mailing things to your old place, defeating the purpose. A common misconception is that filing alone counts, but service is equally required.
E-Filing in Major Counties
Most major counties now require electronic filing for civil cases. The Los Angeles Superior Court uses File & ServeXpress, Orange County uses One Legal, and San Diego uses several approved vendors. Each portal accepts CM-180 as a fillable PDF.
The consequence of filing on paper in a mandatory e-filing county is rejection and a re-filing fee. A real example is a self-represented plaintiff in Los Angeles who walked CM-180 into the Stanley Mosk courthouse in February 2026. The clerk directed him to the e-filing portal, and he lost two days. People often think paper is always allowed, but Local Rule 3.4 makes e-filing mandatory for represented civil parties.
Service by Mail or Email
After filing, you must serve a copy on every party. Service by first-class mail is the default under Code of Civil Procedure § 1013(a), but parties who consented to e-service can be served electronically under § 1010.6.
The consequence of serving the wrong way is that service is invalid, and your address change is not legally effective against the other side. A common misconception is that texting your opponent counts, but text is not authorized service in California civil cases. A real example is Linda, who emailed her ex-husband’s attorney without his prior consent. The court ruled the service invalid, and she had to re-mail the form.
Proof of Service Requirement
Proof of service is a separate document, usually Form POS-030 for mail or POS-050 for e-service. It must be filled out by someone over eighteen who is not a party, signed under penalty of perjury, and filed with the court.
The consequence of skipping the proof of service is that the court cannot confirm the other parties were notified. A real example is Marcus, who filed CM-180 in Fresno Superior Court without a proof of service. The clerk accepted the form, but opposing counsel later argued they never received it. The judge agreed and continued the trial. People often think the post office’s tracking is enough, but California courts require a sworn proof.
Do’s and Don’ts
The do’s and don’ts below cover the practical habits that keep your CM-180 filings clean and your case on track. Each one has a brief reason explaining why it matters.
Do’s:
- Do file CM-180 within ten days of any change because timely filing avoids default risk under Rule 2.200.
- Do keep a stamped copy because it is your only proof if the court loses the original.
- Do serve all parties because the court will not do it for you.
- Do use a permanent address because temporary addresses lead to repeat filings and missed mail.
- Do update the State Bar separately if you are an attorney because Business & Professions Code § 6002.1 requires it.
Don’ts:
- Don’t use a P.O. Box without a physical backup because certified-restricted delivery fails.
- Don’t let an unrepresented co-party assume your filing covers them, because each party files separately.
- Don’t file by fax in counties that no longer accept it, like San Francisco after 2023.
- Don’t forget the proof of service because the filing is incomplete without it.
- Don’t sign on behalf of someone else unless you are their attorney of record.
Pros and Cons of Filing CM-180
Form CM-180 is required, but understanding its strengths and limits helps you use it effectively. The pros and cons below show why this single page matters and where it falls short.
Pros:
- It is free to file in most California counties because no filing fee applies under Government Code § 70617.
- It is one page and takes minutes to complete, lowering the barrier for self-represented litigants.
- It is statewide and works across all case types from small claims to complex civil.
- It creates a clear record protecting you from claims of improper notice.
- It can be e-filed in most counties, speeding the update.
Cons:
- It only updates the court file, not the State Bar, DMV, or other agencies.
- It does not transfer with you between cases, so each case needs its own CM-180.
- It requires separate service, doubling the work for self-represented parties.
- It does not cover criminal cases, which use Form CR-165 instead.
- It does not stop USPS forwarding from expiring after twelve months.
Key Entities and How They Connect
Several entities play a role in the CM-180 process, and knowing each one helps you understand why the form exists. The Judicial Council of California drafts and maintains the form. The Superior Court where your case is pending receives the filed form.
The State Bar of California tracks attorney addresses separately. The California Department of Justice and county sheriffs sometimes serve documents based on the address you provide. The USPS handles mail delivery but does not communicate with the courts.
The plain-English connection is this: the Judicial Council writes the rule, the Superior Court enforces the rule, the parties follow the rule, and the postal service delivers the result. The consequence of misunderstanding any link is missed mail, missed hearings, and missed rights. A common misconception is that updating one entity updates all of them, but each requires its own filing or notice.
Recap of Key Court Rulings
Several California and Ninth Circuit rulings shape how CM-180 is enforced. Carey v. King, 856 F.2d 1439 (9th Cir. 1988), confirmed that courts can dismiss a case when a party fails to update the address. Trackman v. Kenney, 187 Cal. App. 4th 175 (2010), held that valid mail service to the address on file is presumed received, even if the party never picked it up.
In re Marriage of Smith, 90 Cal. App. 4th 74 (2001), confirmed that family law parties have the same duty to update addresses as civil litigants. The plain-English takeaway is that California courts give no slack for outdated contact information. The consequence of relying on these rulings without filing CM-180 is that they all run against you, not for you.
Frequently Asked Questions
Is California Form CM-180 free to file?
Yes. No filing fee applies under Government Code § 70617. The form is free to file with the court in every California county, although you still pay any postage or e-filing vendor charges.
Do I need a lawyer to file CM-180?
No. Self-represented parties file CM-180 every day. The form is designed for non-lawyers and is approved by the Judicial Council for unrepresented use across all civil case types.
Can I file CM-180 by email?
No. California courts do not accept direct email filings for CM-180. You must file through an approved e-filing portal or in person, depending on your county’s local rules.
Is CM-180 used in criminal cases?
No. Criminal defendants use Form CR-165 instead. CM-180 covers civil, family, probate, and small claims matters under Rule 2.200.
Must I serve other parties after filing?
Yes. Service is required under Code of Civil Procedure § 1013. You must mail or e-serve a copy to every party and file a proof of service with the court.
Can I list a P.O. Box as my new address?
Yes. A P.O. Box is allowed, but you should also list a physical address because some certified mail cannot be delivered to a P.O. Box under USPS rules.
Does CM-180 update my State Bar address?
No. Attorneys must separately update the State Bar under Business & Professions Code § 6002.1. CM-180 only updates the court file in your specific case.
Is there a deadline to file CM-180?
Yes. Most courts treat ten days as the outer limit of reasonable under Rule 2.200. Filing later may be allowed, but it weakens any later motion to set aside default.
Can I e-sign CM-180?
Yes. Electronic signatures are valid under Code of Civil Procedure § 17 when filed through an approved e-filing portal that records the signature.
Will the court notify the other side for me?
No. The clerk only updates the court file. You must serve every party yourself and file a proof of service, or the change is incomplete against opposing parties.
Can I file CM-180 for a future move?
Yes. Item 4 allows a future effective date. Filing early is encouraged so the court has the new address ready on the move day, avoiding any gap in mail delivery.
Does CM-180 cover small claims cases?
Yes. Small claims parties use the same form under Rule 2.200. The duty to update applies to every California civil case, including small claims actions filed under Code of Civil Procedure § 116.110.
Related reading
- How to Fill Out California Form FL-120 (w/Examples) + FAQs
- How to Fill Out California Form FL-335 (w/Examples) + FAQs
- How to Fill Out California Form CR-101 (w/Examples) + FAQs
- How to Fill Out California Form MC-050 (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 CIV-010 (w/Examples) + FAQs