What Is a California Employer Payroll Tax Account Number?

A California employer payroll tax account number is the eight-digit identifier the Employment Development Department assigns to every business that pays wages in the state. It’s formatted as 000-0000-0 and is also called a State Employer Identification Number, or SEIN. Every wage report, tax deposit, and compliance record you file ties back to this number, and California requires you to register for one within 15 days of paying more than $100 in wages during any calendar quarter.¹

What the Account Number Covers

Your SEIN tracks four separate California payroll taxes. Two come out of the employer’s pocket; two are withheld from employee wages.²

Unemployment Insurance (UI), paid by the employer. New employers pay a default rate of 3.4 percent for two to three years, then shift to an experience-based rate between 1.5 percent and 6.2 percent on the first $7,000 of each employee’s annual wages.³
Employment Training Tax (ETT), paid by the employer at 0.1 percent on the first $7,000 of each employee’s wages for 2026.⁴
State Disability Insurance (SDI), withheld from employees at 1.3 percent for 2026. Since January 1, 2024, all wages are subject to SDI with no taxable wage cap.⁴
Personal Income Tax (PIT) withholding, taken from employee wages based on allowances claimed on each worker’s DE 4 form.

Your SEIN is not your federal Employer Identification Number. The federal EIN handles your obligations to the IRS; the SEIN handles only state-level payroll taxes administered by the EDD. If you restructure your business or your federal EIN changes, notify the EDD so the two accounts stay aligned. Mismatches between what you report on federal Form 940 and what the EDD has on file can trigger out-of-balance notices.⁵

Who Has to Register

Standard Commercial Employers

Any California business that pays more than $100 in wages during a calendar quarter must register within 15 days. Full-time, part-time, and seasonal workers all count. Commercial employers register using Form DE 1.⁶

Household Employers

If you employ a nanny, housekeeper, or similar in-home worker, the threshold is higher: $750 or more in cash wages during a calendar quarter. Meals, lodging, and other non-cash compensation don’t count toward that $750. Household employers register using Form DE 1HW instead of the DE 1.¹

Nonprofit and Religious Organizations

Having 501(c)(3) status does not exempt you. Nonprofits with employees register the same way as other employers, but they must also submit a Selection of Financing Method form (DE 1SNP) along with a copy of the 501(c)(3) exemption letter. The DE 1SNP lets the organization choose between paying standard UI contributions and reimbursing the state dollar-for-dollar when former employees collect unemployment benefits.⁶

Businesses That Only Pay Independent Contractors

If you work exclusively with legitimate independent contractors, you generally don’t need a standard payroll tax account. You still have to report any contractor paid $600 or more using Form DE 542 within 20 calendar days. And if you need to withhold California PIT from payments to a nonresident contractor, you’ll register using Form DE 1P, even without the other three payroll taxes in play.³

What to Have Ready Before You Apply

The EDD’s online registration doesn’t let you save a partial application and return to it. If you’re missing a field, you start over. Have all of this in front of you first:⁶

Your nine-digit federal EIN from the IRS.
The exact legal business name as registered with the California Secretary of State, plus the SOS ID number for corporations, LLCs, LLPs, and LPs.
Names and Social Security numbers for all individual owners, co-owners, general partners, and corporate officers.
The business’s physical address and its mailing address, if different.
The date you first paid more than $100 in wages (or $750 for household employers).
A description of the activity that generates the largest share of your revenue. The EDD uses this to assign your initial UI rate.
Your DBA name, if you use one.

Corporations, LLCs, LLPs, and limited partnerships should confirm that the legal name and SOS ID number on the application match the Secretary of State’s records exactly. A mismatch delays processing.

How to Register

The fastest route is the EDD’s e-Services for Business portal, open 24 hours a day. The system guides you field by field and flags errors before submission.⁷ Account number requests can take up to ten business days, though many online applications finish faster.

If you’d rather file on paper, download the DE 1 (commercial) or DE 1HW (household) and mail it to:⁸

EDD, Account Services Group, MIC 28
PO Box 826880
Sacramento, CA 94280-0001

Paper doesn’t process faster than online, and you lose the real-time error checking. Either way, the 15-day clock starts the day you cross the wage threshold, so don’t wait on registration while payroll is already running.³

Finding an Account Number You Already Have

If you registered previously and can’t locate the SEIN, the fastest place to check is any past quarterly filing. The DE 9, DE 9C, and Payroll Tax Deposit coupon (DE 88) all display the eight-digit number at the top.⁹ A payroll provider you’ve used will also have it on file.

If no documents are available, log in to e-Services for Business and the number will show on your dashboard. You can also call the EDD’s Taxpayer Assistance Center at 1-888-745-3886 or send a secure message through the portal.⁷ The EDD verifies identity before releasing account details.

What Comes After You Have the Number

Registration is step one. Once your SEIN is active, you file wage reports and deposit payroll taxes every quarter. The two main returns are the DE 9 (which reconciles total wages and tax payments) and the DE 9C (which reports individual employee wages). Both must be filed electronically through e-Services for Business.⁹

The 2026 quarterly deadlines are:

Q1 (January–March): due April 1; delinquent after April 30, 2026.
Q2 (April–June): due July 1; delinquent after July 31, 2026.
Q3 (July–September): due October 1; delinquent after November 2, 2026.
Q4 (October–December): due January 1, 2027; delinquent after February 1, 2027.

¹⁰

Payroll tax deposits (Form DE 88) follow the same quarterly schedule for most employers. Very large employers may be on semi-weekly or next-day deposit cycles instead.

Penalties for Skipping Registration

The EDD treats payroll tax violations seriously. Failing to register, file, or pay on time starts with civil penalties and interest. Deliberately failing to report or pay payroll taxes is a misdemeanor punishable by a fine of up to $1,000 and up to one year in county jail.¹¹

When the EDD determines an employer intentionally evaded taxes, it can assess a 50-percent penalty on top of the unpaid contributions. The department can also file liens against business assets and pursue responsible corporate officers personally for the debt. Registering on time and keeping filings current costs much less than any of that.

1
Employment Development Department. Am I Required to Register as an Employer
2
Employment Development Department. California State Payroll Taxes – Overview
3
Employment Development Department. 2026 California Employer’s Guide (DE 44)
4
Employment Development Department. Contribution Rates, Withholding Schedules, and Meals and Lodging Values
5
Employment Development Department. Federal Unemployment Tax Act
6
Employment Development Department. Employers: Payroll Tax Account Registration
7
Employment Development Department. e-Services for Business
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Employment Development Department. Commercial Employer Account Registration and Update Form (DE 1)
9
Employment Development Department. Required Filings and Due Dates
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Employment Development Department. Payroll Tax Calendar
11
California Legislative Information. California Unemployment Insurance Code 2117