Understanding Form 1094-C: The Essential Transmittal Document for ACA Reporting

Introduction: Why Form 1094-C Matters for Large Employers

If you manage benefits administration or tax compliance for a large employer, you have likely encountered Form 1094-C as part of your annual Affordable Care Act (ACA) reporting obligations. But what is 1094-C exactly, and why is it so important? Form 1094-C is the official IRS transmittal form that accompanies Form 1095-C submissions, serving as a cover sheet and summary document for all the individual employee health coverage reports filed by Applicable Large Employers (ALEs). Without a properly completed Form 1094-C, your 1095-C forms cannot be accepted by the IRS.

The stakes for understanding what is 1094-C are significant. This form contains critical aggregate information about your organization's workforce, the health coverage you offer, and whether you qualify for certain transitional relief provisions. Errors on Form 1094-C can lead to rejected filings, delays in processing, and potential IRS penalty notices. For organizations with hundreds or thousands of employees, the penalties for incorrect or late ACA reporting can reach into the hundreds of thousands or even millions of dollars.

This comprehensive guide answers the question "what is 1094-C" from every angle. We will explain the form's purpose, who must file it, how it differs from and relates to Form 1095-C, what information each section requires, key deadlines, common mistakes to avoid, and how to ensure accurate and timely submission. Whether you are an HR director preparing for your first ACA filing season, a benefits administrator at a multi-location enterprise, or a service provider filing on behalf of clients, this article provides everything you need to know.

Key topics covered in this guide include:

  • Definition and purpose: What Form 1094-C is and why it exists
  • Who must file: Applicable Large Employer requirements and controlled groups
  • Form structure: Understanding Parts I through IV in detail
  • Authoritative vs. non-authoritative transmittals: When and why you need each
  • Relationship to Form 1095-C: How the two forms work together
  • Filing deadlines: When to submit Form 1094-C to the IRS
  • Penalties: Consequences of non-compliance
  • Corrections: How to fix errors after filing

What is Form 1094-C? Definition and Purpose

The Official Definition of Form 1094-C

Form 1094-C, officially titled "Transmittal of Employer-Provided Health Insurance Offer and Coverage Information Returns," is an IRS form that serves as the cover sheet when Applicable Large Employers submit their Form 1095-C filings. The form summarizes the information contained in the attached 1095-C forms and provides aggregate data about the employer, including workforce size, coverage offers, and participation in controlled groups. Think of Form 1094-C as the envelope and summary for your 1095-C submissions—it tells the IRS who is filing, how many forms are included, and provides organizational-level compliance information.

Understanding what is 1094-C requires recognizing its dual role. First, it serves as a transmittal document that accompanies Form 1095-C filings, ensuring the IRS can properly process and match the individual employee forms with the filing employer. Second, it functions as an employer-level information return that reports aggregate workforce data and certifications about the employer's compliance efforts. This organizational data helps the IRS verify that ALEs are meeting their obligations under the employer shared responsibility provisions of the ACA.

The legal basis for Form 1094-C comes from Internal Revenue Code Section 6056, which was enacted as part of the Affordable Care Act. This section requires ALEs to annually report to the IRS about the health coverage they offer to full-time employees. While Form 1095-C reports information about individual employees, Form 1094-C provides the organizational context and aggregate summaries that allow the IRS to understand the employer's overall compliance picture.

The Critical Role of Form 1094-C in ACA Compliance

Form 1094-C serves three essential functions. First, it establishes employer identity and organizational structure, identifying which specific ALE member is filing—crucial because the 50-employee threshold is calculated across related entities. Second, it reports aggregate workforce data (monthly full-time counts, total employees, coverage enrollment) that the IRS uses to verify compliance. Third, it includes certifications about coverage offers to 95% of full-time employees, which directly relate to employer shared responsibility penalty exposure.

Who Must File Form 1094-C

The question of what is 1094-C is directly tied to understanding who must file it. Form 1094-C must be filed by every Applicable Large Employer—any organization that employed an average of at least 50 full-time employees (including full-time equivalent employees) during the prior calendar year. This threshold is calculated using a specific methodology that combines actual full-time employees (those working 30 or more hours per week) with full-time equivalent calculations for part-time employees.

Organizations required to file Form 1094-C include:

  • Single employers with 50+ full-time employees: A standalone company that meets the employee threshold
  • Members of controlled groups: Related companies under common ownership where the combined workforce meets the 50-employee test, with each ALE member filing its own Form 1094-C
  • Members of affiliated service groups: Service organizations treated as a single employer for ACA purposes
  • Government entities: Federal, state, and local government employers that meet the size threshold
  • Educational institutions: Colleges, universities, and school districts with sufficient full-time employees
  • Nonprofit organizations: Tax-exempt entities that employ 50 or more full-time workers

Importantly, every ALE member must file its own Form 1094-C, even when the member is part of a larger controlled group. For example, if a parent company owns five subsidiary companies and each subsidiary has its own Employer Identification Number (EIN), each subsidiary files its own Form 1094-C (and 1095-C forms) reporting on its own employees. However, the forms must indicate the controlled group relationship, and one member of the group typically files an "authoritative" transmittal that reports aggregate data for the entire controlled group.

Form 1094-C Structure: Understanding Parts I Through IV

Part I: Applicable Large Employer Member (ALE Member) Information

When examining what is 1094-C, Part I provides the foundational identification information for the filing employer. This section identifies the specific ALE member that is submitting the form and its Form 1095-C attachments. Accurate completion of Part I is essential because errors can cause the IRS to reject the entire submission or improperly attribute the filing to the wrong entity.

Part I includes the following fields:

Line Field Name Description
1 Name of ALE Member Legal name of the employer entity filing the form
2 Employer Identification Number (EIN) The nine-digit EIN assigned by the IRS to the ALE member
3-6 Address Street address, city, state, ZIP code, and country of the ALE member
7 Name of Person to Contact Name of the individual the IRS should contact with questions
8 Contact Telephone Number Phone number for the contact person
9 Name of Designated Government Entity Only completed if a government entity is designated to report on behalf of the employer
10 EIN of Designated Government Entity EIN of the designated government entity, if applicable
11-17 Total Forms, Authoritative Indicator, and Transmittal Information Number of 1095-C forms attached, whether this is an authoritative transmittal, and related checkboxes

Line 11 indicates the total number of Form 1095-C forms being submitted with this transmittal. This count must exactly match the actual number of 1095-C forms included—mismatches will cause processing errors. Line 12 is a critical checkbox indicating whether this Form 1094-C is the "Authoritative Transmittal" for the ALE member. We will discuss the authoritative transmittal concept in detail below.

Part II: ALE Member Information

Part II of what is 1094-C contains important certifications about the employer's compliance status and participation in controlled groups. This section is where employers indicate whether they qualify for certain relief provisions and provide information about their aggregated ALE group.

Key elements of Part II include:

  • Line 18 - Reserved: This line is currently reserved for future use
  • Line 19 - Qualifying Offer Method: Check this box if you are using the Qualifying Offer Method to simplify reporting. This method allows employers to use simplified reporting when they made a "qualifying offer" of affordable, minimum value coverage to all full-time employees
  • Line 20 - Section 4980H Transition Relief: Previously used for transition relief during the early years of ACA reporting (no longer applicable for current filings)
  • Line 21 - Reserved: Reserved for future use
  • Line 22 - Certifications: Contains multiple checkboxes for certifying compliance, including:
    • Box A: Qualifying Offer Method certification
    • Box B: Reserved
    • Box C: Section 4980H Transition Relief indicator
    • Box D: 98% Offer Method certification (employer offered coverage to at least 98% of employees for whom it filed Form 1095-C)

The certifications in Part II are legally significant. By checking these boxes, the employer is certifying under penalties of perjury that the statements are true, correct, and complete. Incorrect certifications can lead to additional IRS scrutiny, penalty assessments, or in extreme cases, charges of false statements to a government agency.

Part III: ALE Member Information - Monthly Data

Part III is one of the most data-intensive sections of what is 1094-C. This section reports monthly information about the ALE member's workforce and coverage offerings. The data entered here enables the IRS to verify that the employer met its obligations throughout the year, not just at a single point in time.

Part III columns include:

Column Information Reported Purpose
Column (a) Minimum Essential Coverage Indicator Whether minimum essential coverage was offered to at least 95% of full-time employees and their dependents
Column (b) Full-Time Employee Count Number of full-time employees for each month (used to determine potential penalty exposure)
Column (c) Total Employee Count Total number of all employees, including part-time (used for FTE calculations)
Column (d) Aggregated Group Indicator Whether the ALE member was part of an aggregated ALE group for that month
Column (e) Section 4980H Transition Relief Indicator Relief provisions applicable for the month (mostly historical)

The monthly full-time employee counts in Column (b) are particularly important. These numbers directly correlate to potential penalty calculations. If an employer fails to offer coverage to at least 95% of full-time employees and at least one full-time employee receives a premium tax credit for Marketplace coverage, the employer may face Penalty A. The penalty is calculated based on the number of full-time employees (minus 30), making accurate monthly counts essential.

Column (a), the Minimum Essential Coverage indicator, should only be checked "Yes" for months when the employer actually offered coverage meeting the 95% threshold. Many employers mistakenly check "Yes" for all 12 months without verifying that they truly met the threshold each month. New hires, terminated employees, and employees transitioning between full-time and part-time status can affect whether the 95% threshold is met in any given month.

Part IV: Other ALE Members of Aggregated ALE Group

Part IV of what is 1094-C is completed only when the ALE member is part of a controlled group or affiliated service group with other ALE members. This section lists the other members of the aggregated ALE group, allowing the IRS to understand the full organizational picture and verify that all related entities are properly reporting.

Part IV requires the following information for each related ALE member:

  • Name: Legal name of each other ALE member in the controlled group
  • EIN: Employer Identification Number of each other ALE member

This section has space for up to 30 additional ALE members. If the controlled group has more than 30 other members, the employer must file additional Forms 1094-C to list all members. Each additional Form 1094-C used solely to report additional group members should be marked as a non-authoritative transmittal.

The controlled group reporting in Part IV is essential for proper IRS enforcement. The ACA's employer mandate applies at the controlled group level, meaning related companies cannot artificially reduce their workforces to fall below the 50-employee threshold. By reporting all ALE members, Form 1094-C allows the IRS to aggregate employees across related entities and ensure proper penalty assessment when violations occur.

Authoritative vs. Non-Authoritative Transmittals

Understanding the Authoritative Transmittal Designation

A critical concept in understanding what is 1094-C is the distinction between authoritative and non-authoritative transmittals. Line 12 of Form 1094-C asks whether the form being filed is the "Authoritative Transmittal for this ALE Member." This designation determines which Form 1094-C the IRS will use as the official record for the employer's aggregate data and certifications.

Key characteristics of an authoritative transmittal:

  • One per ALE member: Each ALE member can have only one authoritative Form 1094-C per tax year
  • Complete aggregate data: Must include complete and accurate information in Parts II and III
  • All certifications: Contains the binding certifications about compliance status
  • Total form count: Reports the total number of Forms 1095-C filed for all employees of the ALE member (not just those attached to this particular transmittal)
  • IRS reliance: The IRS uses this form to determine potential penalty liability

When non-authoritative transmittals are used:

  • Large employers filing in batches: Employers with thousands of employees may submit Forms 1095-C in multiple batches, each accompanied by a non-authoritative Form 1094-C
  • Controlled group members listing additional entities: When Part IV needs more space, additional forms are non-authoritative
  • Supplemental submissions: Corrections or additional forms filed after the original authoritative submission

Best Practices for Authoritative Transmittal Filing

Proper handling of the authoritative transmittal is crucial for accurate ACA reporting. Here are best practices for managing your Form 1094-C submissions:

For single-transmittal filers:

  • Check "Yes" on Line 12 to indicate this is the authoritative transmittal
  • Ensure Parts II, III, and IV are completely and accurately filled out
  • Verify that Line 11 matches the exact number of attached Forms 1095-C
  • Double-check all certifications before submission

For employers filing multiple transmittals:

  • Designate exactly one Form 1094-C as the authoritative transmittal
  • On the authoritative transmittal, enter the total count of all Forms 1095-C filed across all batches on Line 18
  • Complete Parts II, III, and IV only on the authoritative transmittal
  • Mark all other Forms 1094-C as non-authoritative by leaving Line 12 unchecked
  • Non-authoritative forms only need Part I completed (employer identification)

Form 1094-C and Form 1095-C: How They Work Together

The Inseparable Relationship Between 1094-C and 1095-C

Understanding what is 1094-C requires recognizing its interdependence with Form 1095-C. These two forms are designed to work together as a complete ACA reporting package—Form 1094-C cannot be filed without Form 1095-C attachments, and Form 1095-C cannot be filed with the IRS without an accompanying Form 1094-C transmittal. This paired structure ensures the IRS receives both individual-level detail (1095-C) and organizational-level summary (1094-C) for every ALE.

How the forms work together:

Aspect Form 1094-C Form 1095-C
Purpose Transmittal and summary Individual employee detail
Who is reported The employer as an organization Each full-time employee individually
Data level Aggregate and organizational Individual and specific
Monthly data Workforce counts and coverage indicators Coverage offers, premiums, and enrollment
Recipient IRS only IRS and employee
Quantity filed One authoritative (plus non-authoritative as needed) One per full-time employee

The data on Form 1094-C and Form 1095-C must be internally consistent. For example, the total full-time employee count reported on Form 1094-C Part III should align with the number of Forms 1095-C filed showing full-time employee status. Discrepancies between these forms can trigger IRS inquiries or penalty assessments. Modern ACA reporting software like BoomTax automatically cross-validates this data to prevent inconsistencies.

Form 1094-C Filing Deadlines and Requirements

IRS Filing Deadline

Understanding what is 1094-C includes knowing when it must be filed. The filing deadline for Form 1094-C matches the deadline for Form 1095-C submissions to the IRS. For tax year 2025, the deadline is March 31, 2026 for electronic filers. Paper filing (available only to employers with fewer than 10 Forms 1095-C) has an earlier deadline of February 28, 2026.

Filing deadline summary:

Filing Method Deadline (TY2025) Eligibility
Electronic (via IRS AIR System) March 31, 2026 All filers (mandatory for 10+ forms)
Paper February 28, 2026 Only filers with fewer than 10 Forms 1095-C

The IRS requires electronic filing for any employer submitting 10 or more information returns of any type during the calendar year. Since virtually all ALEs have more than 10 full-time employees (the threshold is 50), electronic filing is mandatory for nearly all Form 1094-C submissions. Employers must use the IRS ACA Information Returns (AIR) system or an IRS-authorized transmitter like BoomTax.

Extensions and Late Filing

Employers can request an automatic 30-day extension by filing Form 8809 (Application for Extension of Time to File Information Returns) before the original deadline. This extends the IRS filing deadline to April 30. A second 30-day extension may be available under certain circumstances but requires demonstrating extraordinary circumstances or showing that the extension is necessary to avoid undue hardship.

Important notes about extensions:

  • Automatic extension: The first 30-day extension is automatic if Form 8809 is filed timely
  • No extension for employee copies: The extension applies only to IRS filing, not to furnishing 1095-C to employees
  • One extension request covers all: Filing Form 8809 extends the deadline for both Form 1094-C and Form 1095-C
  • Penalties may still apply: Late filing penalties apply if the extended deadline is missed

See our ACA Extension Guide for detailed information about requesting extensions.

State Filing Requirements

Beyond federal reporting, employers must be aware that several states have their own ACA reporting requirements. While these states generally accept the same Form 1094-C and 1095-C data, separate submissions to state agencies may be required:

  • California: Requires submission to the Franchise Tax Board
  • New Jersey: Requires submission to the Division of Taxation
  • Rhode Island: Requires submission to the Division of Taxation
  • District of Columbia: Requires submission to the Office of Tax and Revenue
  • Massachusetts: Uses its own Form 1099-HC system with different deadlines

State deadlines typically align with federal deadlines, but employers should verify specific requirements for each state where they have employees.

Penalties for Form 1094-C Non-Compliance

Information Return Penalties

Failure to properly file Form 1094-C can result in significant IRS penalties. These penalties are assessed per form and can accumulate rapidly for large employers:

Timing of Correction Penalty Per Form (2025) Maximum (Large Employers)
Corrected within 30 days $60 $630,500
Corrected by August 1 $130 $1,891,500
Not corrected by August 1 $330 $3,783,000
Intentional disregard $660+ (no cap) Unlimited

These penalties apply to Form 1094-C as well as Form 1095-C. However, since Form 1094-C is a single transmittal form (or small number of forms), the per-form penalty exposure for 1094-C specifically is typically much lower than for 1095-C (where hundreds or thousands of forms may be filed). The real risk with 1094-C errors is that they can invalidate the entire submission, causing all attached 1095-C forms to be rejected.

Connection to Employer Shared Responsibility Penalty

Beyond information return penalties, Form 1094-C errors can have implications for the employer shared responsibility penalty (ESRP). The data reported on Form 1094-C—including workforce counts and certifications about coverage offers—directly influences whether the IRS assesses penalties under IRC Section 4980H.

How Form 1094-C data affects ESRP:

  • Full-time employee counts: Used to calculate potential Penalty A amounts (approximately $2,900 per employee minus 30)
  • 95% coverage offer indicator: Determines exposure to Penalty A versus Penalty B
  • Controlled group reporting: Ensures penalties are properly allocated across related entities
  • Certifications: Employer statements that can protect against or expose the employer to penalties

Employers who receive IRS Letter 226-J proposing ESRP assessments can use their Form 1094-C and 1095-C data to respond and contest proposed penalties. Accurate original filings make this response process much more straightforward.

Common Mistakes and How to Avoid Them

Frequent Form 1094-C Errors

Understanding what is 1094-C includes recognizing common errors: using the wrong EIN (parent company instead of ALE member), mismatching form counts on Line 11 versus actual attached forms, incorrectly marking multiple forms as authoritative, miscounting full-time employees in Part III, checking "Yes" for coverage when the 95% threshold was not met, and certifications that conflict with Form 1095-C data. Using ACA reporting software with validation can prevent most of these issues.

How to Correct Form 1094-C Errors

If errors are discovered after filing what is 1094-C, corrections should be filed promptly. The correction process depends on the type of error and when it is discovered:

  • Corrected transmittal: File a new Form 1094-C with the "Corrected" checkbox marked
  • Aggregate data changes: If Part III data was incorrect, the corrected form must include accurate monthly figures
  • Certification changes: Update certifications on the corrected form as needed
  • Related 1095-C corrections: If 1094-C errors affect 1095-C data, file corrected 1095-C forms as well

Correcting errors quickly reduces penalty exposure. The sooner corrections are filed, the lower the per-form penalty amount. Using a reliable ACA reporting platform that validates data before submission can prevent most errors from occurring in the first place.

Frequently Asked Questions About Form 1094-C

What is Form 1094-C used for?

Form 1094-C is used as the transmittal form that accompanies Form 1095-C filings with the IRS. It serves as a cover sheet identifying the filing employer and provides aggregate workforce data, coverage certifications, and controlled group information. The IRS uses Form 1094-C to verify that Applicable Large Employers are meeting their ACA reporting and coverage obligations.

Who must file Form 1094-C?

Applicable Large Employers (ALEs) must file Form 1094-C. An ALE is any employer that employed an average of at least 50 full-time employees (including full-time equivalent employees) during the prior calendar year. Each member of a controlled group or affiliated service group that is an ALE must file its own Form 1094-C, even if it is part of a larger organizational structure.

What is the difference between Form 1094-C and Form 1095-C?

Form 1094-C is the transmittal and summary form that accompanies Form 1095-C submissions. While Form 1095-C reports individual employee coverage information, Form 1094-C provides organizational-level data including workforce counts, coverage certifications, and controlled group membership. You cannot file Form 1095-C without Form 1094-C, and vice versa.

What is an authoritative transmittal?

An authoritative transmittal is the single Form 1094-C that the IRS uses as the official record for an ALE member's aggregate data and certifications. Each ALE member can designate only one Form 1094-C as authoritative per tax year. If filing multiple batches of Forms 1095-C, one transmittal is marked authoritative and contains complete Parts II, III, and IV, while others are non-authoritative.

When is Form 1094-C due to the IRS?

For tax year 2025, Form 1094-C must be filed with the IRS by March 31, 2026 for electronic filers or February 28, 2026 for paper filers. Paper filing is only available for employers filing fewer than 10 Forms 1095-C. An automatic 30-day extension is available by filing Form 8809 before the original deadline.

Do employees receive a copy of Form 1094-C?

No, employees do not receive Form 1094-C. This form is filed only with the IRS and serves as the employer's organizational report and transmittal. Employees receive Form 1095-C, which reports their individual coverage information. Form 1094-C is an employer-level document that provides context for the employee-level 1095-C forms.

What information goes in Part III of Form 1094-C?

Part III contains monthly data about the ALE member's workforce. This includes whether minimum essential coverage was offered to at least 95% of full-time employees (Column a), the count of full-time employees (Column b), the total employee count (Column c), whether the employer was part of an aggregated group (Column d), and any transition relief indicators (Column e).

What are the penalties for not filing Form 1094-C?

Penalties for failing to file Form 1094-C range from $60 per form if corrected within 30 days to $330 per form if not corrected by August 1. Intentional disregard carries penalties of $660 or more with no cap. Additionally, Form 1094-C errors can cause rejection of all attached Forms 1095-C, potentially multiplying penalty exposure significantly.

Can Form 1094-C be filed electronically?

Yes, Form 1094-C must be filed electronically through the IRS AIR (ACA Information Returns) system for any employer filing 10 or more Forms 1095-C. Since all ALEs have at least 50 full-time employees, electronic filing is mandatory for virtually all Form 1094-C submissions. Third-party transmitters like BoomTax can handle electronic submission.

What if my Form 1094-C has errors?

If you discover errors on Form 1094-C after filing, file a corrected form as soon as possible. Check the "Corrected" box, enter the accurate information, and resubmit through the IRS AIR system. Correcting errors quickly reduces penalty amounts. If errors affect related Form 1095-C data, you may need to file corrected 1095-C forms as well.

How does Form 1094-C relate to controlled groups?

When an ALE member is part of a controlled group or affiliated service group, it must complete Part IV of Form 1094-C listing all other ALE members in the group. This allows the IRS to aggregate employees across related entities and verify proper penalty assessment. Each ALE member in the group files its own Form 1094-C.

What is the 95% coverage offer requirement on Form 1094-C?

The 95% coverage offer requirement refers to the employer mandate obligation to offer minimum essential coverage to at least 95% of full-time employees (and their dependents) to avoid Penalty A under IRC Section 4980H(a). Form 1094-C Part III Column (a) indicates whether this threshold was met each month.

How BoomTax Simplifies Form 1094-C Filing

Understanding what is 1094-C is important, but accurately completing and filing the form is equally critical. BoomTax provides a comprehensive solution that simplifies every aspect of Form 1094-C compliance:

  • Automatic 1094-C Generation: BoomTax automatically generates Form 1094-C based on your Form 1095-C data, ensuring perfect alignment between the transmittal and individual employee forms. No manual data entry or reconciliation required.
  • Intelligent Authoritative Transmittal Handling: The platform automatically manages authoritative and non-authoritative designations when filing in batches, ensuring exactly one authoritative form is submitted with complete aggregate data.
  • Part III Monthly Data Calculation: BoomTax automatically calculates full-time employee counts, total employee counts, and 95% coverage indicators based on your Form 1095-C entries, eliminating manual calculation errors.
  • Controlled Group Management: Easily manage filings for multiple ALE members in a controlled group, with automatic population of Part IV cross-references.
  • 500+ IRS Rule Validation: Before submission, BoomTax validates your data against over 500 IRS business rules, catching errors in employer identification, form counts, certifications, and monthly data before they cause rejections.
  • IRS E-Filing: File directly with the IRS through the AIR system. BoomTax is an authorized transmitter—no need to obtain your own Transmitter Control Code or navigate complex IRS systems.
  • State Filing Support: File with California, New Jersey, Rhode Island, D.C., and Massachusetts from the same platform.
  • Unlimited Corrections: If errors are discovered after filing, correct and refile Form 1094-C at no additional charge. BoomTax includes free unlimited corrections for all filings.
  • Multi-EIN Support: Manage filings for unlimited employer entities from a single account—ideal for service providers managing client filings or enterprises with multiple subsidiaries.

BoomTax offers transparent pay-per-form pricing with no subscription fees. Whether you're an employer with 50 employees or a service provider managing thousands of forms across multiple clients, the platform scales to your needs while ensuring complete Form 1094-C accuracy.

Ready to simplify your Form 1094-C filing? Get started with BoomTax today and eliminate ACA reporting stress.

Conclusion: Mastering Form 1094-C Compliance

Understanding what is 1094-C is essential for any Applicable Large Employer navigating ACA compliance. This transmittal form is the critical link between your individual employee reports on Form 1095-C and the IRS's ability to process, verify, and enforce ACA requirements. From the employer identification in Part I to the aggregate monthly data in Part III and the controlled group reporting in Part IV, every element of Form 1094-C contributes to the complete picture of organizational compliance.

Key takeaways about Form 1094-C:

  • Who files: Applicable Large Employers with 50+ full-time employees (including FTEs), with each ALE member in a controlled group filing separately
  • Purpose: Serves as transmittal for Form 1095-C and provides aggregate employer-level data
  • Authoritative transmittal: One per ALE member per tax year, containing complete Parts II, III, and IV
  • Relationship to 1095-C: Always filed together; 1094-C is the cover sheet for 1095-C submissions
  • IRS filing deadline: March 31, 2026 for electronic filing (tax year 2025)
  • Penalties: $60 to $330+ per form for late or incorrect filing, plus potential ESRP implications
  • Key data: Workforce counts, 95% coverage offer indicators, controlled group membership, and certifications

Success with Form 1094-C requires accurate data collection, proper understanding of authoritative vs. non-authoritative designations, complete Part III monthly reporting, and timely filing. Using a specialized platform like BoomTax streamlines the process, ensuring compliance while reducing administrative burden. As ACA reporting requirements continue, mastering what is 1094-C positions employers for penalty-free compliance year after year.

References and Additional Resources

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