Correcting ACA Reporting Errors After Filing

Employers subject to ACA reporting requirements under Internal Revenue Code Sections 6055 and 6056 sometimes discover mistakes on Forms 1094-C and 1095-C after those forms have been filed with the IRS or furnished to employees. Understanding the correction process, the mechanics of corrected filings, and the consequences of delayed remediation is essential for Applicable Large Employers managing compliance obligations. This page explains the definition and scope of ACA reporting corrections, how the correction process operates, the scenarios that most commonly require correction, and the boundaries that determine which correction pathway applies.

Definition and scope

ACA reporting corrections encompass any amendment to previously filed or furnished Forms 1094-C or 1095-C that changes information the IRS or an employee received. The obligation to correct arises under the general accuracy requirements of IRC §6721 and §6722, which impose penalties for incorrect information returns and incorrect payee statements, respectively (IRS Publication 1586).

The scope of a correction depends on where the error lives:

• Form 1094-C errors — mistakes on the transmittal, such as incorrect Authoritative Transmittal designations, wrong aggregate group member counts, or miscoded offer-of-coverage indicators at the employer level.
• Form 1095-C errors — mistakes on individual employee statements, such as incorrect employee identifiers, wrong coverage codes in Part II (Lines 14–16), incorrect safe harbor codes, or incorrect months of coverage.

The IRS penalty framework under §6721 sets a base penalty of $310 per return for returns corrected after August 1 of the filing year (for 2024 filings, per IRS Revenue Procedure 2023-23), with a lower $60 per-return penalty for corrections filed within 30 days of the original deadline, and $120 per return for corrections filed by August 1. These thresholds make the timing of correction a direct cost variable.

The regulatory context for ACA reporting sets the foundational filing obligations that precede any correction workflow — understanding those obligations determines whether a given error triggers a mandatory correction or falls within a reasonable-cause safe harbor.

How it works

The IRS correction process for ACA information returns follows a specific mechanical procedure distinct from an amended tax return. The IRS does not use a standard "amended" form — instead, corrected ACA filings are the same form (1094-C or 1095-C) submitted with specific indicators activated.

Correcting Form 1095-C (employee-level statements):

1. Prepare a new Form 1095-C with the correct information populated in all fields.
2. Check the CORRECTED checkbox at the top of the form.
3. File the corrected form with the IRS using the same electronic filing system used for original submissions (the IRS AIR — Affordable Care Act Information Returns — system for filers submitting 10 or more returns, per IRS Publication 5165).
4. Furnish a corrected copy to the affected employee, regardless of whether the employee received an incorrect version.

Correcting Form 1094-C (transmittal-level errors):

1. Prepare a new Form 1094-C with corrected data.
2. Check the CORRECTED checkbox.
3. Resubmit with all associated 1095-C records if the submission batch must be re-sent; or, where only the transmittal itself requires correction, submit only the corrected 1094-C marked as Authoritative Transmittal.

The IRS AIR system accepts corrected filings year-round; there is no hard window that closes corrections entirely, though penalty exposure increases with delay. Filers using third-party vendors or payroll systems must confirm that the vendor's platform supports corrected filing — not all platforms generate the XML schema required by AIR for correction records.

Common scenarios

Errors requiring post-filing correction fall into five recurring patterns:

1. Incorrect employee TIN or Social Security Number
A transposed digit on a 1095-C triggers an IRS B-Notice under the name/TIN matching program. The correction must supply the verified TIN alongside the employee's legal name exactly as it appears in SSA records.

2. Wrong offer-of-coverage code (Line 14)
Employers frequently discover they coded Line 14 with a Series 1 code that does not match the actual offer structure — for example, using 1B (offer to employee only) when the plan extended to dependents (1E). This error directly affects IRS penalty calculations under §4980H(b) and may trigger or vacate a Letter 226-J assessment. The IRS penalty notices and Letter 226-J process is directly connected to Line 14 code accuracy.

3. Incorrect employee share of lowest-cost premium
Line 15 requires the monthly premium for the lowest-cost self-only plan. An error here affects affordability determinations. If the reported figure overstates the employee contribution, the IRS may conclude the offer was unaffordable and assess a 4980H(b) penalty.

4. Missing or wrong safe harbor code (Line 16)
Employers that applied an affordability safe harbor — W-2, Rate of Pay, or Federal Poverty Line — and failed to enter the corresponding Series 2 code lose the protection that code provides in an IRS audit or 226-J response context.

5. Authoritative Transmittal filed for wrong EIN
Where controlled groups file under multiple EINs, the Authoritative Transmittal designation (Box 19 on Form 1094-C) must appear on exactly one submission per EIN. A duplicate or misfiled Authoritative Transmittal requires a corrected 1094-C to remove the designation from the incorrect submission.

Decision boundaries

Not every discovered discrepancy requires a formal corrected filing. The decision framework rests on three criteria:

Materiality of the error
The IRS provides a safe harbor for de minimis errors under §6721(c): a single-field error of $100 or less (or $25 or less for errors involving withholding amounts) may not require correction if the recipient does not request one. For ACA reporting, where most fields are categorical codes rather than dollar amounts, this safe harbor applies narrowly — primarily to Line 15 premium amounts.

Whether the error affects penalty liability
An error that changes the IRS's determination of whether a qualifying offer was made — such as a wrong Line 14 code or a missing safe harbor code — must be corrected because it directly affects §4980H penalty exposure. An error that is purely administrative (e.g., a middle initial in an employee name) carries lower urgency.

Original vs. corrected filing pathway comparison

Employers who receive a Letter 226-J penalty notice after filing can submit corrected forms as part of their response package, but corrected filings submitted before a 226-J is issued carry more weight and can reduce the penalty base before the IRS calculates the assessment. The ACA compliance overview at the site index identifies the full sequence of employer obligations from offer design through reporting and correction.

The IRS Instructions for Forms 1094-C and 1095-C (available at IRS.gov) remain the primary procedural authority for correction mechanics and should be consulted alongside any software vendor documentation.

References

• IRS Forms 1094-C and 1095-C Instructions
• IRS Publication 1586 – Reasonable Cause Regulations and Requirements for Missing and Incorrect Name/TINs
• IRS Publication 5165 – Guide for Electronically Filing ACA Information Returns
• IRS Revenue Procedure 2023-23 – Penalty Inflation Adjustments
• Internal Revenue Code §6721 – Failure to File Correct Information Returns (via Cornell LII)
• Internal Revenue Code §6722 – Failure to Furnish Correct Payee Statements (via Cornell LII)
• IRS Affordable Care Act Information Returns (AIR) Program

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