How to Complete Form 1095-C Line by Line

Form 1095-C is the IRS information return that Applicable Large Employers (ALEs) must furnish to each full-time employee and file with the IRS to document compliance with the ACA employer shared responsibility provisions under Internal Revenue Code §4980H. Completing the form accurately — line by line — determines whether an employer can defend against penalty assessments under IRS Letter 226-J. The regulatory context for ACA employer reporting requirements originates in the Affordable Care Act's employer mandate, enforced through Treasury Regulations at 26 C.F.R. §54.4980H-1 through §54.4980H-6.

Definition and Scope

Form 1095-C is a 12-month calendar-year return (IRS Instructions for Forms 1094-C and 1095-C) that captures, month by month, what health coverage an ALE offered, whether the employee enrolled, and at what cost. The form contains three functional parts:

Employers sponsoring fully insured plans complete only Parts I and II. Employers operating self-funded plans complete all three parts. This distinction governs the workload and the data collection requirements for HR and benefits teams.

The form applies only to ALEs — employers with 50 or more full-time equivalent employees in the prior calendar year, as defined under IRC §4980H and the applicable large employer determination rules.

How It Works

Part I: Employee and Employer Information (Lines 1–13)

Lines 1–6 capture the employee's legal name, Social Security Number, and full mailing address as of the time of furnishing (generally by March 1 of the following year per IRS filing deadlines).

Lines 7–13 capture the ALE's Employer Identification Number (EIN), legal name, address, and contact telephone number. The EIN on Form 1095-C must match the EIN on the accompanying Form 1094-C transmittal exactly — mismatches are among the most common processing errors flagged by the IRS.

Part II: Employer Offer of Coverage (Lines 14–16)

This section is the compliance heart of the form and is completed for each of the 12 calendar months, plus an "All 12 Months" shorthand box when all monthly entries are identical.

Line 14 — Offer of Coverage Code (Series 1 codes)

Line 14 identifies what coverage the employer offered to the employee, and whether that offer extended to the employee's spouse and dependents. Codes are drawn from the IRS Series 1 code set, which includes:

  1. 1A — Minimum essential coverage (MEC) providing minimum value offered to the employee, with MEC offered to spouse and all dependents; employee's required contribution for self-only coverage does not exceed the federal poverty line (FPL) safe harbor threshold
  2. 1B — MEC providing minimum value offered to the employee only
  3. 1C — MEC providing minimum value offered to the employee and dependents, not spouse
  4. 1D — MEC providing minimum value offered to employee and spouse, not dependents
  5. 1E — MEC providing minimum value offered to employee, spouse, and dependents
  6. 1H — No offer of coverage made; this is the most common code triggering potential §4980H(a) liability
  7. 1J / 1K — Conditional offers to a spouse

Line 15 — Employee Required Contribution

Line 15 states the lowest-cost monthly premium the employee must pay for self-only, minimum value coverage. This figure is used to evaluate ACA affordability against the applicable percentage threshold set annually by the IRS — for example, 9.12% of household income for plan years beginning in 2023 (IRS Revenue Procedure 2022-34). Line 15 is completed only when Line 14 contains codes 1B, 1C, 1D, 1E, 1J, or 1K; it is left blank when code 1A or 1H is entered.

Line 16 — Section 4980H Safe Harbor and Other Relief Codes (Series 2 codes)

Line 16 identifies whether any safe harbor or relief applies that would shield the employer from a §4980H(b) penalty. Key codes include:

Code 2C is particularly important: when an employee is enrolled, an employer generally faces no §4980H(b) liability, making 2C the strongest protection available at Line 16.

Part III: Covered Individuals (Lines 17–22)

Applicable only to self-insured plans, Part III lists the name, SSN (or date of birth if SSN is unavailable), and the months of coverage for every individual — employee, spouse, or dependent — enrolled in the plan.

Common Scenarios

Scenario 1: Full-time employee enrolled all year
Line 14 = 1E (offer to employee, spouse, dependents), Line 15 = monthly self-only premium, Line 16 = 2C (enrolled). The "All 12 Months" column is used, and no month-by-month variation is required.

Scenario 2: New hire in initial measurement period
For a variable-hour new hire serving a measurement period, Line 14 may show 1H (no offer) and Line 16 shows 2D during the measurement and administrative period months. Once an offer is extended in the stability period, codes shift accordingly.

Scenario 3: Employee who waives coverage
Line 14 reflects the offer code (e.g., 1E), Line 15 shows the lowest self-only premium, and Line 16 uses 2F, 2G, or 2H if an affordability safe harbor applies — or is left blank if none applies and the employee simply declined a compliant offer.

Scenario 4: Part-time employee not offered coverage
Line 14 = 1H, Line 16 = 2B (not a full-time employee). This combination signals to the IRS that no offer was required and no §4980H(a) penalty applies for that month.

Decision Boundaries

Two critical classification distinctions govern code selection:

Full-time vs. non-full-time status determines whether Line 14 must reflect an offer. Under 26 C.F.R. §54.4980H-1(a)(21), a full-time employee is one averaging 30 or more hours of service per week, or 130 hours per calendar month. Misclassifying a full-time employee as part-time and entering 2B at Line 16 is one of the primary triggers for IRS penalty assessments via Letter 226-J.

Self-insured vs. fully insured plan design determines whether Part III is required. A fully insured ALE has no obligation to complete Lines 17–22; that responsibility falls to the insurance carrier via Form 1095-B. Self-funded ALEs must populate Part III for every covered individual, which requires SSN collection processes that fully insured employers do not need.

A third boundary involves transition months: when an employee terminates or is newly hired mid-year, each month is coded individually rather than using the "All 12 Months" shorthand. The month of termination typically requires separate analysis of whether an offer was made for the entire calendar month.

Employers managing complex workforces — including variable-hour, seasonal, and part-time populations — should cross-reference the ACA compliance resource index for guidance on measurement period elections and stability period rules that directly affect which Series 1 and Series 2 codes apply to each employee's 12-month record.

References

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