A SEIN number is California's eight-digit State Employer Identification Number for state payroll tax accounts. The Employment Development Department issues it separately from the nine-digit federal EIN issued by the IRS.
Key Takeaways
- A California SEIN is an eight-digit employer payroll tax account number issued by the Employment Development Department, or EDD.
- A federal EIN, also called an FEIN or federal tax ID, is a nine-digit number issued by the IRS.
- California employers may need both numbers because they serve different state and federal purposes.
- You obtain an SEIN by registering as an employer with the EDD, not by forming a company with the California Secretary of State.
- You can often find a lost SEIN in EDD e-Services, prior payroll tax filings, payroll records, or EDD correspondence.
- The employer state ID shown on a California employee's W-2 is generally the employer's SEIN.
What Is a SEIN Number in California?
SEIN stands for State Employer Identification Number. In California, it refers to the eight-digit payroll tax account number the EDD assigns when a business or other employer registers for state employment tax purposes. You may also see it described as an EDD employer account number, state employer ID, California payroll tax number, or state payroll account number.
The EDD uses the SEIN to connect an employer with wage reports, payroll tax returns, payments, notices, and unemployment insurance records. Employers generally provide the number to payroll providers and include it on required California payroll filings. It also appears as the employer's state identification number in the California state section of employee W-2 forms.
A SEIN does not identify your entity for every California agency. It is not your Secretary of State entity number, seller's permit number, or federal EIN. Each number belongs to a different registration system and has a different purpose. This distinction matters when an application asks for a California tax ID without identifying the issuing agency.
The term "California EIN" can therefore be ambiguous. Some people use it to mean a federal EIN obtained by a California business. Others are actually looking for an EDD payroll tax account number. Check whether the document concerns federal taxes, California payroll, entity formation, or sales tax before entering a number.
FEIN vs. SEIN: What Is the Difference?
An FEIN and an SEIN are not the same number. FEIN means Federal Employer Identification Number and is another name for the federal EIN. The IRS issues an EIN to identify a business or other entity for federal tax administration. The California EDD issues an SEIN to administer state employment taxes and wage reporting.
| Feature | Federal EIN or FEIN | California SEIN |
|---|---|---|
| Issuing agency | Internal Revenue Service | California Employment Development Department |
| Length | Nine digits | Eight digits |
| Primary purpose | Federal business and tax identification | California payroll tax and wage reporting |
| Common users | Corporations, partnerships, employers, and other qualifying entities | Employers subject to California payroll registration requirements |
| Where it commonly appears | Federal tax returns, IRS notices, banking records, and federal payroll forms | EDD notices, California payroll filings, and state fields on W-2 forms |
A business with California employees commonly needs both. It uses its EIN for federal employment tax matters and its SEIN for California payroll reporting. Receiving one does not automatically create the other. Forming an LLC or corporation with the Secretary of State also does not automatically mean that the business has completed its EDD employer registration.
When a form asks for an "employer identification number," use the surrounding language to identify the correct number. References to the IRS, federal taxes, or FEIN indicate the EIN. References to the EDD, California unemployment insurance, state withholding, or employer state ID usually indicate the SEIN.
Who Needs a California SEIN Number?
A business generally needs an SEIN when it becomes subject to California's employer registration and payroll tax rules. Under California's registration threshold, this generally includes an employer that has one or more employees in California and pays more than $100 in wages during a calendar quarter. An employer subject to the California Unemployment Insurance Code must register with the EDD within 15 days after becoming subject.
Registration can apply to corporations, LLCs, partnerships, sole proprietors, and other organizations. Your business structure does not decide the issue by itself. A sole proprietor with California employees may need an SEIN even if the owner previously used a Social Security number for federal tax reporting. Conversely, a California LLC without employees may have an EIN but may not yet need an EDD payroll account.
Household employers may also have registration responsibilities when they pay domestic workers enough to meet applicable payroll thresholds. Nonprofits are not automatically outside the employer registration system merely because of their tax status. Special account types, contribution methods, or reporting rules may apply, so these employers should check the EDD's current instructions.
Do not assume that calling a worker an independent contractor removes payroll obligations. Worker classification depends on the applicable legal standards, not just the contract's title. If a worker should be treated as an employee, unpaid withholding, unemployment insurance, wage reporting, and related obligations may follow. Review classification before deciding that an SEIN is unnecessary.
Getting an SEIN and a Federal EIN
To get an SEIN, register the employer with the California EDD. Employers can use the EDD's e-Services for Business system and should follow the account type and registration instructions that apply to their workforce. Prepare the business's legal name, addresses, entity information, federal EIN if available, responsible-party details, and information about when California wages began.
- Confirm that the workers are employees and identify when California employment began.
- Review the current employer registration requirements on the EDD website.
- Create or access the appropriate e-Services account.
- Enter the employer's legal and payroll information accurately.
- Save the confirmation and account documents with your permanent payroll records.
Avoid using a trade name where the application requests the entity's legal name. Differences among EDD, IRS, Secretary of State, and payroll provider records can delay account setup or make later filings difficult to match.
To obtain a federal EIN, apply separately through the IRS. The IRS permits eligible applicants to apply online and also provides current instructions for other application methods. Complete state entity formation first when you are creating an LLC or corporation so the legal name on the EIN application matches the approved entity record.
An EIN is generally required for corporations, partnerships, multi-member LLCs, businesses with employees, and entities filing certain federal tax returns. Some sole proprietors and single-member LLCs may use the owner's taxpayer identification number unless another federal requirement applies, but they can still request an EIN for appropriate business purposes.
How to Find Your California SEIN Number
Start your SEIN number search with records created by the EDD or your payroll system. Unlike a general business entity search, an employer payroll account contains sensitive tax information and is not designed as a public directory for unrestricted searches.
Check these sources in order:
- EDD e-Services: Sign in to the employer's authorized account and review the payroll tax account details.
- EDD correspondence: Look for registration confirmations, notices, statements, or other letters addressed to the employer.
- Prior payroll tax filings: Review filed California wage reports and payroll tax returns, including prior DE 9 records.
- Payroll provider records: Ask the provider or accountant responsible for California payroll. Confirm that the number belongs to your legal entity rather than another client or related company.
- Employee W-2 copies: Review the California employer state ID field on copies retained by the employer.
- EDD assistance: Contact the EDD if authorized records do not reveal the number. Be prepared for identity and authority verification.
Do not substitute the federal EIN merely because it appears on more documents. An eight-digit EDD account number and a nine-digit IRS EIN are separate identifiers. If you recently registered and cannot find the SEIN, check whether the registration was completed and whether the EDD issued account confirmation.
If payroll registrations, legal names, or account numbers are inconsistent across agencies, a business attorney can review the entity records, identify which registrations require correction, and coordinate with your payroll or tax professionals. You can post your legal need on UpCounsel's marketplace to receive proposals from qualified attorneys, with responses typically arriving within a day.
California EIN Number and State Tax Number Map
California businesses can accumulate several identification numbers. Calling all of them a "tax ID" creates errors, especially when opening payroll accounts or responding to government notices. Identify the agency and purpose before supplying any number.
| Number or account | Issuer | What it identifies |
|---|---|---|
| Federal EIN or FEIN | IRS | The business or entity for federal tax administration and related purposes |
| SEIN or EDD employer account number | California EDD | The employer's California payroll tax and wage-reporting account |
| Secretary of State entity number | California Secretary of State | A registered corporation, LLC, or other entity in state formation records |
| Seller's permit account | California Department of Tax and Fee Administration | A business registered for applicable sales and use tax activities |
| Franchise Tax Board reference | California Franchise Tax Board | The taxpayer, account, notice, or filing identified in FTB records or correspondence |
A bank, licensing agency, customer, or vendor may ask for a "California EIN number" without using precise terminology. Ask which agency's number it needs and what the number will be used for. A request connected to payroll or California unemployment generally points to the SEIN. A federal tax certification usually calls for the EIN. An entity-status request may call for the Secretary of State number instead.
Never enter a number solely because it fits the available boxes. Review the form's instructions or ask the requesting organization to clarify. Using the wrong number can cause mismatched records, rejected filings, or notices that do not reach the correct account.
Employer State ID on California W-2 Forms
On a California W-2, the employer state ID is generally the employer's SEIN. It appears in the state information area and connects the employee's reported California wages and withholding with the employer's EDD payroll account. It is different from the federal EIN displayed elsewhere on the form.
If you are an employee and the state ID is missing or appears incorrect, contact the employer or payroll department first. Do not guess the number from an online business search or replace it with the federal EIN. The employer should review its EDD account and payroll records and determine whether a corrected wage statement or other action is appropriate.
If you are the employer, compare the W-2 state field with your EDD registration confirmation and filed California payroll returns. Also verify the legal employer name. A payroll provider may have entered an affiliate's account, an old account, or a federal EIN in the state field. Correcting the source records helps prevent the same mismatch from carrying into later reports.
Keep EDD account confirmations, filed returns, payroll reports, and employee wage statements together under the correct legal entity. Businesses with related companies should maintain separate records for each employer. Shared owners, addresses, or payroll staff do not make separate legal employers interchangeable for tax reporting.
Frequently Asked Questions
Can I perform a public SEIN number lookup for another company?
A general public SEIN lookup is usually not the appropriate way to obtain another employer's payroll account number. Ask the company for the number when you have a legitimate reporting need. If you are authorized to act for the employer, use its records or contact the EDD and complete any required identity verification.
Does hiring an independent contractor require an SEIN?
Hiring a genuine independent contractor does not by itself create an employee payroll account requirement. However, describing a worker as a contractor does not control legal classification. Review California's current classification standards because a misclassified worker may create payroll reporting, withholding, unemployment insurance, and wage-related obligations.
Can one SEIN cover several California business locations?
One SEIN may cover multiple locations operated by the same legal employer, but separate entities should not assume they can share an account. Acquisitions, reorganizations, and payroll consolidations can change the analysis. Confirm the proper account treatment with the EDD before reporting multiple entities or transferring employees between accounts.
Can a buyer keep the seller's SEIN after purchasing a business?
A buyer should not assume that the seller's SEIN transfers with the business. The correct registration depends on the transaction, legal employer, and resulting entity structure. Review the EDD's current acquisition and employer-registration instructions before wages are reported under either party's account.
Does a nonprofit or household employer need an SEIN?
A nonprofit or household employer may need an SEIN when it becomes subject to California employment tax registration rules. These employers can have specialized account options or reporting requirements. Check the EDD's current instructions for the employer type and wages involved rather than relying on ordinary commercial payroll assumptions.
