Worker Classification: Employee vs. Independent Contractor Under the ABC Test and IRS Rules

The distinction between an employee and an independent contractor determines who pays employment taxes, who provides benefits, and what legal protections the worker receives. Under the IRS common-law test (which the IRS now groups into three categories of evidence; Revenue Ruling 87-41’s older 20 factors remain a reference), the classification depends on the degree of control the hiring business exercises over the worker. Under the stricter ABC test used by some states, including California, the worker is presumed to be an employee unless all three prongs of the test are satisfied. The financial stakes are high: a business that treats 10 workers as independent contractors when they should be employees may face a retroactive assessment for 3-4 years of unpaid employment taxes, plus penalties and interest, easily exceeding $100,000. The IRS’s Section 530 safe harbor (from the Revenue Act of 1978) provides some relief for businesses that have a reasonable basis for treating workers as contractors, but the safe harbor is increasingly difficult to rely on as enforcement intensifies at both the federal and state level.

How do you determine worker classification?

Can a marketing agency get Section 530 relief for its contractors?

Possibly, if the agency passes all three tests: every required 1099 for each manager and year filed before the exam, no one in a similar role on payroll, and a reasonable basis, such as a prior IRS employment tax audit of similar workers that didn’t reclassify them. The IRS must give written notice of Section 530 at the start of the audit and consider it first.

Agencies have two catches. Section 530 doesn’t apply to an engineer, designer, drafter, computer programmer, systems analyst or similar skilled worker the agency provides to a client under an arrangement with that client; status then turns on the common-law rules alone. And 530 relief covers federal employment taxes, so it doesn’t answer a California ABC test claim.

Before any audit, the Voluntary Classification Settlement Program can move the managers onto payroll going forward. The IRS says it won’t share VCSP applications with state agencies, but it doesn’t say the program settles anything with the state.

What should an agency keep to defend 1099 freelancers?

Keep records that show the freelancer runs an independent business: their other clients, their own marketing, invoices per project, and freedom to decide how the work gets done. In California, unless one of the state’s exemptions applies, the agency has to prove all three ABC prongs, so you need proof that the person is customarily engaged in an independently established trade of the same kind, and that they’re free from your control both under the contract and in fact.

• A 1099-NEC for each freelancer, filed by January 31, for every year you pay them at least the threshold ($600 for 2025 payments, $2,000 for payments made in 2026)
• A dated record of why you treated them as contractors when you started, such as a prior employment tax audit or advice from an accountant who knew the facts
• Consistent treatment of everyone doing the same work
• No retirement plan participation or other employee-only benefits

Records can’t fix facts like the ones in this example, where the agency sets hours and approves every post.

What would reclassifying the agency’s social media managers cost?

For the five managers in this example at $80,000 each, the agency would owe its full 7.65% employer FICA and FUTA on their pay. The income tax and employee FICA it didn’t withhold would be figured under IRC 3509 at 1.5% of wages and 20% of the normal employee FICA, about 3.03% of wages, or roughly $2,424 per manager per year as an approximate example.

That employee-side figure rises to about 6.06% if the agency skipped the required 1099s without reasonable cause, and the reduced rates are lost entirely on a finding of intentional disregard. Interest runs on top.

A California agency faces a separate hit. The managers fail ABC prong B because social media work is the agency’s core business, and willful misclassification carries $5,000 to $15,000 per violation, or $10,000 to $25,000 for a pattern or practice.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.