California has more new hire paperwork requirements than most states. Here is what you need to collect and provide, organized by when it needs to happen.

On or before the employee’s first day, you need a completed W-4 for federal tax withholding and a DE-4 for California state tax withholding. These determine how much to deduct from each paycheck. If the employee doesn’t submit a DE-4, you withhold at the default rate, but you should still have them fill one out and keep it on file.

The I-9 has a strict deadline. Section 1 must be completed by the employee on their first day of work, not before. Section 2, where you verify identity and work authorization documents, must be completed within three business days of the start date. Late or missing I-9s can result in fines ranging from $252 to over $2,500 per form for a first offense.

You are also required to report the new hire to the California Employment Development Department within 20 days of their start date. This is done through the EDD’s e-Services portal or by mailing a copy of the W-4. The state uses this data to enforce child support orders and detect unemployment fraud, and failing to report can cost $24 per employee or $490 if it appears intentional.

California requires several written notices at the time of hire. The Wage Theft Prevention Act notice (sometimes called the DLSE Notice to Employee) covers pay rate, pay day, employer information, and other compensation details. You also need to provide a paid sick leave notice, a workers’ compensation notice explaining how to file a claim if injured, and information about rights for victims of domestic violence, sexual assault, and stalking.

Employees must receive and acknowledge your sexual harassment prevention policy. California requires all employers with five or more employees to have a written policy, and new hires should sign an acknowledgment that they received it. You should also provide a Health Insurance Marketplace notice (required by the ACA) and, if applicable based on your company size, FMLA and CFRA leave rights information.

Beyond what is legally mandated, most employers also collect a direct deposit authorization, emergency contact information, an employee handbook acknowledgment, and any role-specific certifications or licenses. For medical practice bookkeeping in Orange County and healthcare settings, this often includes verifying professional licenses, certifications, and background checks before the employee starts seeing patients.

Keep all of this organized in a personnel file for each employee. If you get audited by the EDD or the Department of Labor, they will ask for these documents and expect them to be complete with proper dates. The fines for missing paperwork are avoidable but add up fast when you multiply them across multiple hires.

If handling all of this feels overwhelming, especially when you are trying to run the business at the same time, consider getting help with new employee onboarding. Having a system in place before you hire means nothing falls through the cracks and every employee starts with a clean, compliant file.