Running payroll yourself is doable, especially with modern software. But it involves more than cutting checks. You’re calculating wages, withholding the right taxes, making timely deposits, and filing quarterly and annual reports.

Before your first payroll run, you need an Employer Identification Number from the IRS and registration with the California Employment Development Department. EDD handles state income tax withholding, unemployment insurance, and State Disability Insurance. Get these accounts set up before you hire anyone or you’ll be scrambling to catch up.

Each pay period follows the same pattern. Calculate gross pay from hours worked or salary. Subtract federal income tax based on the employee’s W-4. Subtract Social Security and Medicare. Subtract California state income tax and SDI. The result is net pay. You also owe employer-side taxes that don’t come out of the employee’s check: matching Social Security and Medicare plus federal and state unemployment.

Deposits happen on a schedule based on your total tax liability. Federal payroll taxes typically deposit monthly or semi-weekly. California has similar timing rules. Miss a deposit deadline and penalties start immediately. Neither the IRS nor EDD offers grace periods.

File Form 941 quarterly with the IRS to report wages and taxes withheld. California requires quarterly reports to EDD for unemployment and withholding. At year end, you issue W-2s to employees and file W-3 with the Social Security Administration. Keep records of everything.

California adds complexity beyond what many other states require. Sick leave accrual, meal and rest break documentation, and detailed pay stub requirements are all on you to handle correctly. Getting this wrong creates liability that goes beyond just tax penalties.

Payroll software like Gusto or QuickBooks Payroll handles most of the math and filing automatically. You enter hours, review the calculations, and approve the run. The software calculates withholdings, schedules tax deposits, and files quarterly reports. This turns a complex process into something a small business owner can manage without becoming a payroll expert.

The setup is where most mistakes happen. Configuring your software correctly, entering employee information accurately, and connecting to tax accounts the first time determines whether the system runs smoothly or creates problems you discover months later. Payroll setup and training can get everything configured properly so you’re confident running it yourself going forward.

If you’re already working with a bookkeeping service, ask about integrating payroll with your books. When payroll and accounting are connected, you avoid duplicate entry and your financial statements stay accurate without extra work at month end.