IRS Penalty Notices: Letter 226-J Explained

Letter 226-J is the formal IRS notice used to propose Employer Shared Responsibility Payment (ESRP) assessments against Applicable Large Employers (ALEs) under Internal Revenue Code Section 4980H. The notice triggers a structured response process with strict deadlines and carries potential penalty exposure that can reach millions of dollars for mid-size employers. Understanding the mechanics of this letter—how it is generated, what it contains, and how employers can dispute or resolve it—is essential for any organization subject to the ACA employer mandate.

Definition and Scope

Letter 226-J is issued by the Internal Revenue Service under the authority of IRC Section 4980H, which establishes the Employer Shared Responsibility provisions of the Affordable Care Act. The notice proposes a specific ESRP dollar amount for a given calendar year and identifies the employees whose Marketplace coverage triggered the IRS matching process.

The letter applies exclusively to ALEs—organizations that employed an average of at least 50 full-time equivalent employees in the prior calendar year (IRS, Employer Shared Responsibility Provisions). Employers below that threshold are outside the scope of Section 4980H and will not receive a 226-J notice on those grounds.

The proposed ESRP in a 226-J notice is calculated under one of two penalty structures:

  1. Section 4980H(a) — "Sledgehammer" penalty: Triggered when an ALE fails to offer minimum essential coverage to at least 95 percent of its full-time employees (and their dependents), and at least one full-time employee receives a premium tax credit through a Marketplace plan. For tax year 2023, the annualized penalty was $2,880 per full-time employee (minus the first 30), per the IRS ESRP Q&A.
  2. Section 4980H(b) — "Tack hammer" penalty: Triggered when an ALE offers coverage that fails to meet minimum value or affordability standards for one or more full-time employees who then receive a premium tax credit. For tax year 2023, the annualized penalty was $4,320 per such employee, capped at the 4980H(a) amount that would have applied (IRS ESRP Q&A).

The regulatory context for ACA employer requirements—including the interplay between Marketplace subsidy determinations and IRS enforcement—directly shapes how and when these notices are generated.

How It Works

The IRS generates Letter 226-J through a data-matching process that cross-references two datasets: (1) the ALE's Forms 1094-C and 1095-C filed for the year in question, and (2) Marketplace records identifying employees who received advance premium tax credits (APTCs). When an employee listed on an employer's 1095-C is found to have received an APTC, the IRS evaluates whether the employer's offer of coverage was sufficient to block that subsidy eligibility.

The sequence of events following issuance follows a defined structure:

  1. Issuance of Letter 226-J: The IRS mails the notice to the employer's address of record. The letter specifies the proposed ESRP amount, the applicable tax year, and a list of employees (identified by partial SSN) whose coverage triggered the assessment.
  2. Employee Premium Tax Credit Chart (APTC table): Attached to the letter, this table lists each affected employee, the months for which a credit was received, and the employer's reported offer codes from Form 1095-C.
  3. Response deadline: Employers have 30 days from the date of the letter (not the receipt date) to respond. Extensions can be requested in writing before the deadline expires.
  4. Employer response via Form 14764: The employer submits a signed response accepting, disputing, or partially disputing the proposed assessment. A corrected or supplemental 1095-C may accompany the dispute.
  5. Issuance of Letter 227: The IRS replies with one of five variants of Letter 227, either closing the matter, adjusting the penalty, or scheduling the case for further review.
  6. Notice and Demand (CP 220J): If the ESRP is sustained after the response process, the IRS issues a CP 220J demanding payment. Interest accrues from the date of that notice.

Common Scenarios

Three fact patterns generate the majority of 226-J notices:

Coverage gap scenarios: An ALE offered coverage but failed to extend it to a qualifying dependent group or dropped coverage for a portion of the plan year. Even a single month of non-offer to 5 percent or more of full-time employees can activate the 4980H(a) calculation.

Affordability or minimum value failures: Coverage was offered but structured at a premium contribution level that exceeded the affordability threshold for one or more employees, who then obtained subsidized Marketplace coverage. Employers that did not properly apply an affordability safe harbor are frequently exposed here.

Reporting code errors: The 1095-C codes submitted to the IRS inaccurately reflected what coverage was offered, creating a mismatch between what the employer believes happened and what the IRS data shows. Errors in Series 1 or Series 2 code selections are a documented source of erroneous 226-J assessments. The ACA Authority home provides foundational context on how these reporting structures operate.

Decision Boundaries

An employer receiving Letter 226-J faces three threshold decisions that determine the response path:

Accept the full assessment: If the proposed ESRP is accurate and no defenses apply, the employer can sign Form 14764 accepting the liability. This resolves the matter without further IRS action beyond the CP 220J payment demand.

Dispute the full assessment: If the employer believes the proposed ESRP is entirely incorrect—due to reporting errors, misidentified employees, or inapplicable coverage months—a full dispute is filed with supporting documentation. Corrected 1095-C forms and payroll records are the primary evidentiary tools.

Partial acceptance: Where some months or some employees in the APTC table are correctly assessed and others are not, a partial response accepts liability for confirmed exposure while disputing specific line items. This is the most common outcome for employers with complex workforce structures.

The distinction between 4980H(a) and 4980H(b) liability is itself a decision boundary: an employer cannot face both penalties simultaneously for the same month. If 4980H(a) applies, 4980H(b) does not add an additional layer—the 4980H(b) exposure is only relevant when 4980H(a) is not triggered. Employers with questions about how to construct a formal dispute response should consult the dedicated guidance on how to respond to a 226-J penalty assessment.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)