Payroll processing is the complete cycle of calculating employee compensation, withholding the correct taxes and deductions, issuing payments, and filing the required tax forms with federal and state agencies. For a California employer, that cycle includes calculating gross wages, applying federal income tax withholding, Social Security and Medicare (FICA) deductions, California state income tax (PIT) withholding, and State Disability Insurance (SDI) deductions for each employee.

It also includes the employer’s own tax contributions: FUTA, FICA matching, State Unemployment Insurance (SUI), and Employment Training Tax (ETT). The process concludes with depositing withheld taxes on the required schedule and filing quarterly and annual returns. Done correctly, it protects employees and keeps the employer in compliance. Done incorrectly, it generates penalties, interest, and in California, potential personal liability for the business owner.

Gross pay is the total amount an employee earns before any deductions. Net pay, sometimes called take-home pay, is the amount the employee actually receives after all withholdings and deductions are applied. The deductions that move an employee from gross to net include federal income tax withholding, California PIT withholding, the employee’s share of FICA (Social Security and Medicare), California SDI withholding, and any voluntary deductions the employee has authorized, such as health insurance premiums, 401(k) contributions, flexible spending account contributions, and wage garnishments.

For California employees, SDI withholding is a standard deduction that many employees ask about, particularly when they first see it on their pay stub. The SDI deduction funds California’s short-term disability and paid family leave programs.

An Employer Identification Number (EIN) is a nine-digit federal tax identification number issued by the IRS. It functions as your business’s federal tax identity, the equivalent of a Social Security number for your company. Any business that has employees is required to have one, and it’s used to file federal payroll tax returns, open a business bank account, and handle other official tax matters.

You will also need a California Employer Account Number from the EDD, which is separate from your federal EIN and assigned when you register as an employer in California. You can apply for an EIN directly through the IRS online, free of charge, with immediate processing.

Payroll mistakes in California can have consequences at both the federal and state level, and the severity depends on what went wrong, how long it went undetected, and whether it was a one-time error or a pattern. Common mistakes include incorrect withholding amounts, missed tax deposits, misclassified employees, and late payroll tax filings.

The IRS charges failure-to-deposit penalties starting at 2% of unpaid taxes for deposits one to five days late, escalating to 15% for amounts unpaid more than ten days after the first IRS notice. The EDD has its own penalty structure for late California state deposits and filings. California wage and hour errors, including overtime miscalculations, missed meal breaks, and pay stub inaccuracies, can also trigger employee wage claims and civil penalties. When a mistake is discovered, the best course of action is to correct it promptly, file any required amended returns, and put a process in place to prevent it from happening again.

A Form 1099-NEC (Nonemployee Compensation) reports payments made to independent contractors and other non-employees for services rendered. If your business paid an individual or non-corporate entity $600 or more during the calendar year for services, you are generally required to issue a 1099-NEC. Unlike employees, independent contractors receive their full gross payment with no withholding and are responsible for their own self-employment taxes.

California employers must be especially careful about the line between employees and independent contractors. California’s worker classification rules under AB 5 and subsequent legislation are among the strictest in the country, and misclassifying an employee as a contractor, even unintentionally, can result in back payroll taxes, penalties, and civil liability. The 1099-NEC is due to recipients by January 31, with copies filed with the IRS by the same date.

Effective January 1, 2026, the California statewide minimum wage is $16.90 per hour for employers not covered by a higher industry-specific or local rate. Several industries have higher floors: fast food restaurant employees at covered chains earn at least $20.00 per hour, and certain healthcare facility workers earn between $18 and $24 per hour depending on the facility type.

The minimum annual salary for exempt (salaried) employees rose as a result too: to qualify for most white-collar exemptions in California in 2026, an employee must earn at least $70,304 per year. Many California cities and counties have local minimum wages that exceed the statewide rate, and the applicable rate is based on where the employee works, not where the employer is headquartered. The California Department of Industrial Relations maintains the current statewide and local minimum wage rates.

Payroll reconciliation is the process of verifying that wages paid and taxes withheld during a pay period match the figures in your accounting system and the amounts remitted to tax agencies. It’s typically performed at the end of each pay period, at the end of each quarter, and at year-end before W-2s are issued.

A complete reconciliation compares gross wages per the payroll register to the wages reported on quarterly tax returns, verifies that all withholdings were deposited correctly and on time, confirms that employer tax payments match the payroll register, and checks that total W-2 wages match the annual payroll records. Errors discovered early are relatively straightforward to correct. Errors discovered during an audit or by an employee reviewing a W-2 are far more disruptive, which is why regular reconciliation is one of the most underused error-prevention practices in small business payroll.

A payroll audit reviews a business’s payroll records, processes, and tax filings to verify compliance with applicable laws and the accuracy of reported wages and withholdings. Audits can be initiated internally by a business owner or HR team, externally by the IRS as part of an employment tax examination, or by the California EDD as a state unemployment insurance or SDI compliance review.

Internal audits are a best practice for catching discrepancies before a government agency finds them, and typically review employee classifications, pay rates, overtime calculations, withholding accuracy, deposit timing, and W-2 accuracy. External audits are triggered by factors like inconsistencies between reported wages and individual tax returns, employee complaints, industry selection, or statistical flags in EDD or IRS data systems. Responding to an external payroll audit requires organized documentation and, in most cases, professional guidance.

In California, the distinction is defined primarily by the ABC test established under AB 5. A worker is presumed to be an employee unless the hiring entity can show all three of the following: (A) the worker is free from the control and direction of the hiring entity in performing the work; (B) the worker performs work outside the usual course of the hiring entity’s business; and (C) the worker is customarily engaged in an independently established trade, occupation, or business.

California’s ABC test is more stringent than the federal common-law test and narrower than the economic realities test used in some other states. Misclassifying an employee as a contractor means the employer failed to withhold payroll taxes, failed to pay employer-side taxes, may have denied the worker minimum wage and overtime protections, and may have failed to provide required workers’ compensation coverage. AccuPay’s employee vs. independent contractor guide covers the California-specific rules in detail.

Self-service payroll software typically starts at $40 to $60 per month plus $4 to $8 per employee per month, before year-end fees and add-ons. Full-service bureaus generally price on an all-inclusive custom quote covering payroll processing, tax filing, W-2 production, and dedicated support.

For a California business with 20 employees, self-service software might run $120 to $220 per month at base rates, before the staff time required to run it and any penalty exposure from errors. A full-service bureau quote for the same business will be higher at the invoice level but includes services the software doesn’t, and it eliminates the internal labor cost. AccuPay’s how much does payroll cost guide breaks this down further by provider and pricing model, including hidden fees that don’t show up on software pricing pages.