Employment tax examinations and worker classification: Section 530, IRC 3509, CSP and Tax Court review

What an employment tax exam covers

Pub 5146 (Rev. 1-2026) lists the returns: Form 940 (FUTA), Form 941 (quarterly), Forms 943 and 944, Form 945 for withheld income tax on nonpayroll payments, and related returns. Employment taxes include withheld income tax, Social Security and Medicare (including the employee-only 0.9% Additional Medicare Tax on wages over $200,000) and FUTA. Typical issues are worker classification, unreported wages and fringe benefits, officer compensation, tips, backup withholding and filing compliance. The trust fund recovery penalty against responsible persons is a collection matter; see the trust fund recovery penalty.

How cases start

Under IRM 4.23.3.2, employment tax workload is identified centrally, and the required filing check program feeds it: examiners of income tax, excise or exempt organization returns check employment tax compliance and decide whether an employment tax exam is warranted. Policy Statement 4-4 says income tax examinations include consideration of employment tax liability, and LB&I must refer employment tax issues to specialists. In practice, a Schedule C or corporate exam that finds contractor payments can turn into a worker classification exam. The scope is set by the employment tax examiner's judgment and can be limited or expanded, including to prior and subsequent years, with the taxpayer told of any expansion (IRM 4.23.3.8.2.2).

Section 530 comes first

IRM 4.23.5.3.1 states the order of analysis: “Section 530 is a relief provision that must be considered as the first step in any case involving worker classification.” The examiner must explore it even if the taxpayer does not raise it, must give the taxpayer Pub 1976 before starting a classification exam, and must address all three requirements even if one fails. And “The taxpayer need not concede or agree to the determination that the workers are employees for section 530 relief to be available.”

Under section 530(e)(4), if the taxpayer establishes a prima facie case (both consistency tests, one of the three safe havens, and full cooperation), the IRS bears the burden of proving the treatment was wrong (IRM 4.23.5.3.3). If section 530 applies, the classification exam stops and the taxpayer can keep treating the class as non-employees while the facts stay the same and the Forms 1099 continue.

The common-law test

If section 530 does not apply, the examiner decides employee status under the common-law rules of IRC 3121(d)(2), or the statutory categories for corporate officers, statutory employees and section 218 agreements (IRM 4.23.6.2). IRM 4.23.5.7.1 says the 20 factors in Rev. Rul. 87-41 may still be used for reference, but the primary method is to weigh all the evidence of the right to direct and control, which falls into three categories: behavioral control, financial control and the relationship of the parties. The IRM stresses there is no magic number of factors and that evidence weight changes over time; its example is a uniform requirement, once a strong control fact, now often about customer safety. A business can also ask for a determination on Form SS-8; IRM 4.23.18 coordinates SS-8 cases with exams.

The Tax Court applies the same common-law analysis with its own list of factors, which is what the case will be judged against if it goes to court under IRC 7436. In Weber v. Commissioner, 103 T.C. 378 (1994), aff'd 60 F.3d 1104 (4th Cir. 1995), a Methodist minister claimed to be self-employed; the court held he was an employee after weighing seven factors: “(1) The degree of control exercised by the principal over the details of the work; (2) which party invests in the facilities used in the work; (3) the opportunity of the individual for profit or loss; (4) whether or not the principal has the right to discharge the individual; (5) whether the work is part of the principal's regular business; (6) the permanency of the relationship; and (7) the relationship the parties believe they are creating.” It called the right to control “the crucial test” and added that an employer “need not stand over the employee and direct every move made by that employee.” Build the file around those seven factors from the first IDR: the contracts, who supplied tools and premises, the worker's exposure to loss, termination rights, how integral the work is to the business, how long the relationship lasted, and what Forms 1099 or W-2 the parties issued.

IRC 7436 issues and Tax Court review

IRC 7436 gives the Tax Court jurisdiction over an actual controversy about whether workers are employees or whether the taxpayer is entitled to section 530 relief, and the proper amount of tax under that determination. IRM 4.23.5.2.2: “Worker classification issues are always IRC 7436 issues.” Wage issues become 7436 issues if the payment was reported on Form 1099, or the taxpayer raises a classification or section 530 argument about it, including first raising it in a protest. A wage issue with no classification or section 530 argument is not reviewable by the Tax Court, as the IRM's own example explains.

Under IRM 4.23.5.2, tax from 7436 issues cannot be assessed until the taxpayer has had the opportunity to petition, and taxpayers must be told of the right to Tax Court review before any agreement. If the IRS mails a notice of determination of worker classification by certified or registered mail, IRC 7436(b)(2) bars a proceeding “unless the pleading is filed before the 91st day after the date of such mailing”. Only the person for whom the services were performed can petition. Small case procedures are available when the employment tax in dispute is $50,000 or less for each calendar quarter (IRC 7436(c)). And a change in treatment to employee status while the case is pending is not held against the taxpayer (IRC 7436(b)(3)). See Tax Court petitions.

IRC 3509 reduced rates

When an employer failed to withhold because it treated an employee as a non-employee, IRC 3509 replaces full liability for the employee's share of FICA and income tax withholding with reduced rates; the employer's share of FICA and FUTA remains. “Application of IRC 3509 is mandatory if the criteria are satisfied.” It applies only to worker classification adjustments, not to wage issues, even 7436 wage issues (IRM 4.23.8.5). The rates in IRM 4.23.8.5.1 (rev. 04-17-2024):

If the failure to file Forms 1099 was due to reasonable cause and not willful neglect, the lower 3509(a) rates apply. Above the wage base, the rate is split between Social Security and Medicare components. Timely Forms 1099 therefore matter three times over in a classification exam: for section 530 reporting consistency, for the 3509 rate, and for CSP eligibility.

The Classification Settlement Program

CSP lets the IRS offer a settlement in classification cases where section 530 is not met, because examiners cannot weigh litigation hazards themselves (IRM 4.23.6.2). It is available in SB/SE, TE/GE, LB&I and Appeals. If the taxpayer timely filed all required Forms 1099 and meets the other requirements, the examiner must make an offer. Years without timely Forms 1099 are not eligible, although “an inadvertent de minimis failure to timely file Forms 1099 should not affect the taxpayer's eligibility for CSP” (IRM 4.23.6.6).

Under IRM 4.23.6.14.1, a 100% offer is a full employment tax adjustment for the most recent year under examination, and a 25% offer is 25% of that adjustment, each computed using IRC 3509(a) rates where applicable; FUTA is included at 100% in both (IRM 4.23.6.14.10). In every case the taxpayer agrees to treat the workers as employees prospectively, on a standard closing agreement (Forms 14490, 14491 or 14492). Separate classes of workers can get different offers. Acceptance is voluntary: “A taxpayer's rejection of a CSP offer will in no way affect the outcome of the examination,” and appeal and judicial rights are kept. For businesses not under exam, the Voluntary Classification Settlement Program (Form 8952) gives similar prospective relief, and a VCSP agreement closes the classification issue for that class unless the taxpayer is out of compliance with it (IRM 4.23.6.19).

Agreements, interest and penalties

Employment tax cases close on the Form 2504 series: Form 2504 for adjustments not subject to IRC 7436, Form 2504-T for adjustments subject to it, and Form 2504-S where classification and section 530 issues were not addressed (Pub 5146). Signing does not bar a later refund claim or more tax and does not extend the statute; see what agreement forms do. The statute extension form for employment tax is Form SS-10 (IRM 25.6.22.3).

Interest-free adjustments under IRC 6205 are available if the employer signs a Form 2504 at the close of the exam or Appeals conference, before notice and demand, and for errors discovered after 2008 pays the tax with the agreement (IRM 4.23.8.3.1). Paying without signing does not qualify.

On penalties, IRM 4.23.8.5.1 notes that the failure to deposit penalty “does not apply to FICA and income taxes which should have been, but were not, withheld from compensation paid to employees,” so in a reclassification it is usually computed on the employer's share only. The accuracy-related penalty does not apply to a substitute for return, and first-time abatement can apply to failure to file, pay and deposit penalties if its criteria are met; see the failure to deposit penalty and first-time abatement. Employment tax returns filed early are treated as filed on April 15 of the following year for the assessment statute (IRC 6501(b)(2)).

Backup withholding and Forms 1099

The same exam can raise backup withholding. IRM 4.10.5.6.3 tells examiners to decide classification first: “If the worker is an employee, backup withholding is not applicable and if asserted, could establish a safe haven.” For properly classified contractors without Forms 1099 or TINs, examiners consider backup withholding on Form 945 and information return penalties. For how those cases are run, see backup withholding examinations, Form 945 and Form 1099-NEC.

Questions practitioners ask