California employers are required to offer health insurance only if they averaged at least 50 full-time equivalent employees during the prior calendar year. That threshold comes from the Affordable Care Act’s employer shared responsibility rules, and businesses that meet it must offer qualifying coverage to full-time employees and their dependents or face federal penalties.1Internal Revenue Service. Employer Shared Responsibility Provisions Employers below that line have no obligation to offer a plan, though California layers on its own reporting rules and continuation-coverage requirements that reach smaller businesses.
How to Tell If You Hit the 50-Employee Threshold
The count is based on a prior-year average, not a snapshot of today’s payroll. For each month of the previous calendar year, add the number of full-time employees (those averaging 30 or more hours per week, or 130 hours per month) to the full-time equivalent count derived from part-time hours, then divide the twelve monthly figures by 12.2Internal Revenue Service. Determining if an Employer Is an Applicable Large Employer A restaurant with 35 full-time cooks and enough part-time servers to push the combined figure over 50 is an Applicable Large Employer, even though its full-time headcount alone would not cross the line.
Hours of service include every hour you pay for. Active work, vacation, sick leave, holidays, and jury duty all count toward the 30-hour average.3Internal Revenue Service. Identifying Full-Time Employees For variable-hour workers whose schedules shift week to week, the IRS allows a look-back measurement period of 3 to 12 months. If the employee averaged 30 hours per week over that window, they are treated as full-time during a corresponding stability period and must be offered coverage, even if their hours later drop.4Internal Revenue Service. Notice 2012-58
Common ownership matters. Businesses under shared control get combined for the threshold calculation. A parent company with two subsidiaries, one at 40 full-time employees and another at 25, has 65 combined employees, so both subsidiaries fall inside an Applicable Large Employer group even though neither qualifies alone.2Internal Revenue Service. Determining if an Employer Is an Applicable Large Employer Penalties, if any arise, are calculated separately for each entity in the group.
The Seasonal Worker Exception
If your workforce only crosses 50 because of seasonal hiring, you can escape the mandate. The exception applies when two conditions are both met: your headcount exceeded 50 full-time equivalents for 120 days or fewer during the year, and the workers who pushed you over the line were seasonal (holiday retail staff, harvest-season agricultural labor, and similar).2Internal Revenue Service. Determining if an Employer Is an Applicable Large Employer A year-round workforce of 48 that swells to 55 for four months of seasonal help is likely safe. If those extra workers are permanent, the exception does not apply.
What a Qualifying Offer Must Include
Offering any plan is not enough. The coverage has to clear three tests, and failing any one of them can trigger penalties even though a plan was technically on the table.
First, it must qualify as minimum essential coverage. Second, it must be affordable. For plan years beginning in 2026, the employee’s required contribution for the cheapest self-only option cannot exceed 9.96% of household income.5Internal Revenue Service. Rev. Proc. 2025-25 Because employers rarely know a worker’s household income, the IRS provides safe harbors based on W-2 wages, rate of pay, or the federal poverty line; using one correctly shields you from penalties even if the plan would be technically unaffordable for a given employee. Third, it must provide minimum value, covering at least 60% of the total allowed cost of benefits. Most major-carrier plans clear this bar; skinny plans that cover only preventive care often do not.
You also cannot stall new hires. Federal rules cap the waiting period at 90 days from the date an employee becomes eligible.6eCFR. 45 CFR 147.116 Many employers tie enrollment to the first of the month following 60 days of employment, which stays well inside the limit.
Dependents have to be offered the chance to enroll, but you are not required to pay for their coverage. Most California employers subsidize some portion of dependent premiums to stay competitive, but the legal obligation stops at making the offer available.
What It Costs to Skip or Mishandle Coverage
The ACA imposes two different penalties on Applicable Large Employers, and which one applies depends on what went wrong. Both are assessed monthly, so fixing a gap partway through the year limits the exposure.
If you fail to offer minimum essential coverage to at least 95% of your full-time employees in a given month, and even one of those employees enrolls in subsidized coverage through Covered California, the penalty is calculated against your entire full-time workforce minus the first 30 employees.7Office of the Law Revision Counsel. 26 USC 4980H For 2026 the amount is $3,340 per full-time employee per year. An employer with 100 full-time employees that offered no coverage would face a potential annual exposure of $233,800 (70 employees multiplied by $3,340).
The second penalty applies when you did offer coverage to enough employees but the plan failed the affordability or minimum value tests. In that case the penalty is $5,010 per year for 2026, charged only for each employee who actually obtained a premium tax credit through Covered California.7Office of the Law Revision Counsel. 26 USC 4980H The total is capped so it never exceeds what the no-offer penalty would have been.
If You Have Fewer Than 50 Employees
Employers below 50 full-time equivalents are exempt from the ACA mandate, and no federal penalty applies if a small business chooses not to offer coverage.1Internal Revenue Service. Employer Shared Responsibility Provisions Many offer it anyway because health benefits remain one of the strongest recruiting tools in the California labor market.
Small employers that do offer coverage voluntarily may qualify for a federal tax credit if they have fewer than 25 full-time equivalent employees, pay average annual wages below an inflation-adjusted cap, and cover at least 50% of employee-only premium costs. The maximum credit is 50% of premium expenses (35% for tax-exempt organizations) and runs for two consecutive tax years, with coverage purchased through Covered California for Small Business.8Internal Revenue Service. Small Business Health Care Tax Credit and the SHOP Marketplace
Being exempt from the mandate does not mean being free of all state obligations. California’s continuation coverage law, Cal-COBRA, applies to group health plans covering 2 to 19 employees, so businesses too small for federal COBRA still have continuation obligations when an employee leaves or loses hours. Cal-COBRA provides up to 36 months of continued coverage, and former employees who exhaust 18 months of federal COBRA can transition to Cal-COBRA for an additional 18 months.9California Department of Managed Health Care. Keep Your Health Coverage (COBRA) Federal COBRA itself kicks in once an employer maintained a group health plan and employed at least 20 workers on more than half of its typical business days the prior year.10U.S. Department of Labor. FAQs on COBRA Continuation Health Coverage
One trap for smaller businesses: independent contractors do not count toward the 50-employee total, but California’s worker classification rules under AB 5 make it risky to assume a worker is truly independent. Misclassification does not just create wage-and-hour liability. It can mean you have been undercounting your workforce for ACA purposes, converting what looked like a small-employer exemption into a penalty situation.
California Reporting and the Individual Mandate
Applicable Large Employers must file IRS Forms 1094-C and 1095-C to document the coverage they offered, to whom, and for which months.11Office of the Law Revision Counsel. 26 USC 6056 California requires those same forms to be filed with the Franchise Tax Board, which uses them to enforce the state’s individual coverage mandate.12Franchise Tax Board. Report Health Insurance Information For returns covering the 2025 calendar year, the IRS filing deadline is March 2, 2026 for paper and March 31, 2026 for electronic submissions, and employers filing 10 or more returns must file electronically.13Internal Revenue Service. 2025 Instructions for Forms 1094-C and 1095-C
California residents who go without qualifying coverage for any part of the year face a state tax penalty. For 2025, the amount is the greater of $950 per uninsured adult ($475 per child) or 2.5% of household income above the filing threshold.14Franchise Tax Board. Health Care Mandate – Personal That gives employees a practical reason to accept employer-sponsored coverage when it is offered, and it pushes those who decline toward obtaining other qualifying coverage on their own.
The reporting link matters for employers because Covered California uses 1095-C filings to determine whether employees who applied for marketplace subsidies actually had access to affordable employer coverage. Incomplete or late records can let employees collect subsidies they should not have received, and the resulting premium tax credits can route the inadequate-coverage penalty straight back to you.