Applying to CSLB · Taxpayer ID numbers
Checked 22 September 2026 against the Business and Professions Code, CSLB’s own application and IRS.gov · Written by the License Ladder team
Yes. CSLB’s application instructions say every applicant gives a Social Security number “or individual taxpayer identification number (ITIN) if an individual does not have an SSN,” and California law says no board in the Department of Consumer Affairs “shall deny licensure to an applicant based on his or her citizenship status or immigration status.” Everything else about the license is unchanged: the experience, the exams, the fees, the bond.
This page is about a single field on CSLB’s application and the law behind it. It does not ask what your status is and does not assume anything about it. Every point below is quoted from the statute, from CSLB’s own form, or from IRS.gov, with the link next to it.
CSLB’s instructions for the Application for Original Contractor License, form 13A-1 (rev. 01/2026), say it in one sentence: “All applicants are required to provide their U.S. Social Security number (SSN) or individual taxpayer identification number (ITIN) if an individual does not have an SSN.”
Business and Professions Code §30(a)(2)(A) requires a licensing board to ask for “either the individual taxpayer identification number or social security number if the applicant is an individual.” The same subdivision bars a board from making you disclose citizenship or immigration status for licensure.
§135.5(b): “no entity within the department shall deny licensure to an applicant based on his or her citizenship status or immigration status.” “The department” is the Department of Consumer Affairs, and §7000.5(a) puts CSLB inside it: “There is in the Department of Consumer Affairs a Contractors State License Board.”
The rest of the path is the same for every applicant. You must be 18 or older, show four years of applicable experience in the classification you apply for, pass Law & Business and your trade exam, pay the nonrefundable $450 application fee, the exam fees and, after you pass, the initial license fee ($200 for a sole owner, $350 for anyone else), complete fingerprinting and CSLB’s Asbestos Open Book Examination, and carry a $25,000 contractor’s bond and workers’ compensation coverage or an exemption. An ITIN changes which number goes in one box. It does not shorten or soften any other requirement.
Sources: CSLB, Application for Original Contractor License, form 13A-1 (rev. 01/2026), General Information and Instructions, Section 3; Cal. Bus. & Prof. Code §30; §135.5; §7000.5; CSLB, Before Applying for the Examination (age 18). All read 22 September 2026.
Two different rules do two different jobs. §135.5 is about who may be licensed. §30 is about which identifying number a board collects. Neither is long, so here is each one in the words the Legislature used, read on leginfo.legislature.ca.gov on 22 September 2026.
Three subdivisions. Subdivision (b) is the operative one, and it is quoted with the cross-reference it carries; the exception it names, §7583.23(e), belongs to the private security act, not to contractors.
“(a) The Legislature finds and declares that it is in the best interests of the State of California to provide persons who are not lawfully present in the United States with the state benefits provided by all licensing acts of entities within the department, and therefore enacts this section pursuant to subsection (d) of Section 1621 of Title 8 of the United States Code.
(b) Notwithstanding subdivision (a) of Section 30, and except as required by subdivision (e) of Section 7583.23, no entity within the department shall deny licensure to an applicant based on his or her citizenship status or immigration status.
(c) Every board within the department shall implement all required regulatory or procedural changes necessary to implement this section no later than January 1, 2016. A board may implement the provisions of this section at any time prior to January 1, 2016.”
Cal. Bus. & Prof. Code §135.5. The code’s own history note: “Added by Stats. 2014, Ch. 752, Sec. 2. (SB 1159) Effective January 1, 2015.” Read 22 September 2026.
§30 is long, and most of it is about reporting to the Franchise Tax Board. The part that decides which number an applicant writes down is subdivision (a)(2):
“(A) In accordance with Section 135.5, a board, as defined in Section 22, the State Bar of California, and the Department of Real Estate shall require either the individual taxpayer identification number or social security number if the applicant is an individual for a license or certificate…
(B) In implementing the requirements of subparagraph (A), a licensing board shall not require an individual to disclose either citizenship status or immigration status for purposes of licensure.
(C) A licensing board shall not deny licensure to an otherwise qualified and eligible individual based solely on the individual’s citizenship status or immigration status.
(D) The Legislature finds and declares that the requirements of this subdivision are consistent with subsection (d) of Section 1621 of Title 8 of the United States Code.”
And the number is not optional. §30(c): “a licensing board shall not process an application for an initial license unless the applicant provides its federal employer identification number, or individual taxpayer identification number or social security number where requested on the application.”
Cal. Bus. & Prof. Code §30. History note: “Amended by Stats. 2021, Ch. 615, Sec. 2. (AB 474) Effective January 1, 2022. Operative January 1, 2023, pursuant to Section 463 of Stats. 2021, Ch. 615.” Read 22 September 2026.
Three things these sections do not do, and this page will not say they do. §135.5 speaks to licensure by entities inside the Department of Consumer Affairs; it is not about anything outside that. §30 is an identification and tax-reporting rule; it is not a statement about anyone’s status. And neither one promises that any particular application is approved, because CSLB decides each application on its own facts.
Both sections are current law as we read them on 22 September 2026. §135.5(a) states that it was enacted under 8 U.S.C. §1621(d), and §30(a)(2)(D) says the same of that subdivision. Statutes change. If you are reading this long after the date above, open the leginfo links and check.
You are not looking for a special form or a separate process. On CSLB’s standard application the field itself names both numbers, and one goes in the box.
On Application – Page 1 of 5, the qualifying individual’s row carries three labeled fields: full legal name, date of birth, and one headed SOCIAL SECURITY NUMBER or ITIN. That is the box. The driver’s license number sits on the next line, in item 6.
Page 2 of 5 repeats the same label for every other person listed on the license: officers, members, partners, directors. Each of them signs under penalty of perjury.
CSLB’s instruction for the whole packet: “Leave no space blank. If a particular question or request for information does not apply to you, write ‘N/A’ in the blank space.”
Field labels and instructions read on form 13A-1 (rev. 01/2026), 22 September 2026. CSLB posts the current version on its Forms and Applications page; use the copy you download there, not a copy from anywhere else.
This is the question most people actually want answered, and it is one of the few places where the honest answer is already written down. Form 13A-1 carries a notice headed “Collection of Social Security Numbers, Individual Taxpayer Identification Numbers, and Federal Employer Identification Numbers.” Here it is, whole.
“With the exception of the driver’s license number, all information requested on the application is mandatory, including disclosure of U.S. Social Security numbers (SSN), individual taxpayer identification numbers (ITIN), and federal employer identification numbers (FEIN). Collection of the SSN, ITIN, and FEIN is authorized by BPC sections 30, 31, and 7145.5. SSNs, ITINs, and FEINs are used exclusively for the purpose of tax enforcement, compliance with any judgment or order for family support in accordance with Family Code section 17520, measurement of employment outcomes of students who participate in career technical education programs offered by the California Community Colleges as required by BPC section 30, and investigation of tax evasion and violations of cash-pay reporting laws as set forth in Section 329 of the Unemployment Insurance Code. If you fail to disclose your SSN, ITIN, or FEIN, your application will not be processed, and you will be reported to the Franchise Tax Board; they may assess a $100 penalty against you.”
CSLB, form 13A-1 (rev. 01/2026), General Information and Instructions. Read 22 September 2026.
§30(h): a “federal employer identification number, individual taxpayer identification number, or social security number furnished pursuant to this section shall not be deemed to be a public record and shall not be open to the public for inspection.” Your mailing address of record is published on CSLB’s website once you are licensed; the number in box 5a is not.
The notice above covers the number itself. The same form carries a second notice, “Collection of Personal Information,” that covers everything on the application. CSLB writes that it “makes every effort to protect the personal information you provide us; however, it may be disclosed in response to a Public Records Act request as allowed by the Information Practices Act; to another government agency as required by state or federal law or as provided in Civil Code section 1798.24; or in response to a court or administrative order, a subpoena, or a search warrant.” Separately, the fingerprints every applicant submits are compared to the records of the California Department of Justice and the Federal Bureau of Investigation. Read both notices on the form before you apply, and if you have questions about what they mean for you, ask one of the free legal resources listed below.
CSLB does not issue ITINs and neither do we. The IRS does, and it publishes exactly what the application takes and how long it waits. Everything in this section is quoted or summarized from IRS.gov, read 22 September 2026.
The IRS’s definition: “An ITIN is a 9-digit number the IRS issues if you need a U.S. taxpayer identification number for federal tax purposes, but you aren’t eligible for a Social Security number (SSN).” It adds: “An ITIN is issued by the IRS for federal tax purposes only,” and, on eligibility, “If you’re a resident alien, nonresident alien or their spouse or dependent, you can apply for an ITIN regardless of immigration status.”
One more IRS line worth knowing: “You can’t have both an ITIN and an SSN.” If you get an SSN later, the IRS asks you to stop using the ITIN and tell them so the records are combined.
The IRS prints these four bullets under the heading “An ITIN doesn’t”; we quote all four rather than summarizing them, and we repeat the negative on every line, so that no line can be misread on its own as something an ITIN does:
The words inside the quotation marks are the IRS’s, and they mark the edge of what this page can tell you.
Three things, per the IRS: Form W-7, “Application for IRS Individual Taxpayer Identification Number”; a U.S. federal income tax return (Form 1040 or 1040-NR), unless you meet one of the IRS’s exceptions to the filing requirement; and supporting documents that are “proof of foreign status and identity.”
By mail to the IRS ITIN Operation in Austin, Texas. In person, the IRS lists four options and marks two of them free: an IRS Taxpayer Assistance Center with ITIN services, and a Volunteer Income Tax Assistance (VITA) site with ITIN services. Certifying Acceptance Agents and Acceptance Agents are listed as fee-based. In-person filing means “most supporting documents authenticated and returned immediately.”
The IRS’s own timing: “Allow 7 weeks for us to notify you about your ITIN application status. It can take 9-11 weeks if it’s tax season (January 15 to April 30) or if you applied from overseas.” Plan the CSLB application around that, not the other way around.
Sources: IRS, Individual taxpayer identification number (ITIN) (page last reviewed 28 October 2025); IRS, How to apply for an ITIN; IRS, About Form W-7 (page last reviewed 30 March 2026). All read 22 September 2026.
A page like this is only useful if it is honest about where it stops. Here is where it stops.
This is general information about a licensing rule. It is not legal advice, not immigration advice and not tax advice, and reading it does not make anyone your lawyer. Your situation may turn on facts this page knows nothing about.
It also makes no claim about work authorization or employment eligibility: the IRS’s own line is that an ITIN does not “Authorize you to work legally in the U.S.” Whether and how any particular person may work is a question for the agencies and professionals named below. That question can touch the license itself in one case: a license qualified by a responsible managing employee (RME) requires that person to be a bona fide, permanent employee of the business, working in it at least 32 hours a week or 80% of its operating hours, whichever is less.
Nothing here says any application will be approved. CSLB reviews experience, runs a criminal background check through fingerprinting, and can return an incomplete application for correction. Quoting the rule that lets you apply is not the same as predicting what CSLB does with your file.
We also do not tell anyone what their status is, and did not ask. The law quoted above is written so a board does not have to ask either.
License Ladder is a study-material company. CSLB says it plainly on the first page of the application packet: “there are no schools or application preparation organizations that are affiliated with or agents of CSLB, although some may have company names that are confusingly similar to CSLB.” That includes us. The same notice adds that “official CSLB examination study guides are available free of charge on CSLB’s website.”
Talking to CSLB about your application costs nothing. Applying for an ITIN through an IRS Taxpayer Assistance Center or a VITA site costs nothing. If anyone tells you a fee is required to ask a question of either agency, that is not coming from the agency.
Quotes from CSLB form 13A-1 (rev. 01/2026), Important Notice. Read 22 September 2026.
Where the honest answer is “ask the agency,” here is the agency, with the number or the page. Each of these is free.
CSLB’s Licensing Information Center answers application questions at 800-321-CSLB (2752). CSLB also runs a free licensing workshop in Spanish on the third Friday of each month at 10:00 a.m.; the registration link goes up on the banner of CSLB’s homepage before each one.
The IRS answers ITIN questions at 800-829-1040 and publishes what an ITIN is, who is eligible, and how to apply. Its Taxpayer Assistance Centers with ITIN services and its VITA sites both review Form W-7 and authenticate documents at no cost.
Not us. The State Bar of California lists free and low-cost immigration help and warns that “Some dishonest providers pretend to be attorneys or are immigration consultants (sometimes called notarios) who by law cannot provide legal advice.” The California Department of Social Services funds organizations across the state whose providers “can provide free legal consultations.” For people who are in immigration proceedings, the U.S. Department of Justice publishes a List of Pro Bono Legal Service Providers.
State Bar of California, Resources for Immigrants · CDSS, Legal Services · DOJ EOIR, List of Pro Bono Legal Service Providers
The number in box 5a is one line of a long application. The rest of the path is written up here: the CSLB exam guide for the application, the fees and the two exams; journey-level experience for the four years and who can certify them; exam day for what PSI asks you to bring; and the glossary for the terms the forms use without explaining.
Almost every applicant sits Law & Business, whichever classification they are after, with narrow exceptions. License Ladder’s Law & Business package is $99, or $149 with General Building (B). Both are launch prices; they go to $189 and $249 when the launch ends. See the packages
We read each source below on 22 September 2026. Where CSLB, the IRS or the statute says something different from this page on the day you read it, they govern and we are wrong.
California statutes, on leginfo.legislature.ca.gov: Bus. & Prof. Code §135.5 · §30 · §7000.5
CSLB: Application for Original Contractor License, form 13A-1 (rev. 01/2026) (the SSN-or-ITIN instruction in Section 3; the box labels on Application pages 1 and 2; the Important Notice; the collection notice; the $450 fee; the $25,000 bond) · Forms and Applications · Before Applying for the Examination · Licensing Workshops
IRS: Individual taxpayer identification number (ITIN) · How to apply for an ITIN · About Form W-7, Application for IRS Individual Taxpayer Identification Number
Free legal help: State Bar of California, Resources for Immigrants · California Department of Social Services, Legal Services · U.S. Department of Justice, EOIR, List of Pro Bono Legal Service Providers (updated 26 August 2026)
Scope note: this page covers one field on CSLB’s original license application and the two Business and Professions Code sections behind it. It does not cover any other agency, benefit, program or consequence, and it is not a guide to the IRS’s eligibility rules; those are on IRS.gov, linked above.
Sources checked 22 September 2026. General information, not legal, immigration or tax advice.
License Ladder is independent study material, not affiliated with or endorsed by CSLB or PSI.