IRS Form 4423 Guide: ACA Information Return Application

1. Introduction – What is Form 4423?

IRS Form 4423, officially titled “Application for Filing Affordable Care Act (ACA) Information Returns,” is an official federal application form. It is governed and administered by the Internal Revenue Service (IRS).

This form is used to request a 5-character Transmitter Control Code (TCC). This code authorizes organizations to electronically transmit Affordable Care Act information returns—such as Forms 1094-B, 1095-B, 1094-C, and 1095-C—through the IRS Affordable Care Act Information Returns (AIR) system.

2. Purpose of the Form – Why Does This Form Exist?

Under the Affordable Care Act, applicable large employers, self-insured businesses, and health insurance providers must report health coverage information to the IRS annually. The IRS requires electronic transmission for entities filing 10 or more information returns.

Form 4423 exists to establish an authorized electronic filing relationship between the applicant and the IRS. Obtaining a TCC through this application ensures that the IRS can track, authenticate, and securely process high-volume ACA health coverage data transmissions.

3. Who Needs to File This Form – Eligibility Criteria

Form 4423 serves as a specialized application for specific organizational filers. You may need to use this form if:

• You are a foreign organization without a U.S. Employer Identification Number (EIN) that must transmit ACA information returns electronically.
• You are a foreign software developer or third-party reporting service creating or transmitting ACA filing software for client returns.
• You are a foreign issuer or employer acting as your own electronic transmitter for ACA reporting.

Most domestic U.S. organizations with a valid EIN complete this application process online through the IRS e-Services portal rather than using the paper Form 4423.

4. Who Is Exempt / Not Required to File

You do not need to file paper Form 4423 under the following circumstances:

• Domestic U.S. Entities: Organizations with a U.S. EIN apply directly online using the ACA Application for TCC inside IRS e-Services.
• Employers Using Third-Party Vendors: If you hire a payroll vendor or reporting service that already possesses an active ACA TCC, you do not need your own TCC.
• Small Exempt Employers: Employers not classified as Applicable Large Employers (ALEs) that do not offer self-insured health plans are not subject to ACA information reporting.

5. When to File – Deadlines and Frequency

Form 4423 is a one-time, event-based application submitted prior to your first electronic ACA filing season. It is not filed on an annual schedule unless you need to update organizational details or request an additional TCC.

You must submit Form 4423 at least 45 calendar days before the electronic filing deadline for ACA returns. This 45-day lead time gives the IRS sufficient opportunity to process your application, assign your TCC, and allow you to complete required communications testing before live transmission.

6. Where and How to File

Qualifying foreign applicants submit paper Form 4423 by mail or fax directly to the IRS office handling ACA information return applications. Do not attach Form 4423 to an annual income tax return.

Send the completed application to the IRS address as per instructions for ACA TCC processing. Domestic applicants should skip the paper form entirely and access the electronic application via IRS e-Services.

7. Step-by-Step Instructions to Fill the Form

Completing Form 4423 requires detailed organizational contact information and designated administrative roles. The table below outlines the primary sections of the form:

Form Section	Field Description	Filing Instructions
Block 1	Applicant Information	Enter the full legal name, trade name, foreign address, and contact details of the applying organization.
Block 2	Application Type	Indicate whether this is a new application, a revision to an existing application, or a request for an additional TCC.
Block 3	Role Identification	Select your transmit role: Software Developer, Transmitter, or Issuer/Employer filing on its own behalf.
Block 4	Responsible Officials	Provide full legal names, titles, and contact information for at least two Responsible Officials with legal authority to sign on behalf of the organization.
Block 5	Operational Contacts	List day-to-day contacts who will handle technical AIR system issues and transmission acknowledgments.
Block 6	Signatures & Certification	A designated Responsible Official must sign and date the form certifying that all information is true and complete.

8. Required Documents/Information Needed Before Filling

Before preparing Form 4423, gather the following organizational details:

• Full legal business name and official foreign address.
• Legal names, job titles, phone numbers, and email addresses for at least two Responsible Officials.
• Contact details for operational staff managing technical tax transmissions.
• Specification of electronic transmission method (User Interface or Application-to-Application).

9. Common Mistakes to Avoid

Filing errors on Form 4423 can delay TCC approval and disrupt your ACA filing season. Avoid these common mistakes:

• Filing too close to the deadline: Submitting the form with less than 45 days remaining before the ACA filing due date, leaving insufficient time for processing and system testing.
• Domestic entities using paper: U.S. businesses with an EIN submitting paper Form 4423 instead of applying online through IRS e-Services.
• Listing only one Responsible Official: Failing to provide two Responsible Officials, which leads to automatic application holding.
• Unmonitored contact emails: Providing inactive or temporary email addresses for system alerts, causing missed IRS technical notifications.
• Skipping AIR testing: Attempting to transmit live ACA data without first completing mandatory electronic testing under IRS Publication 5164.

10. Penalties for Non-Filing or Errors

Form 4423 itself does not carry direct financial non-filing penalties. However, failing to obtain a valid TCC prevents you from transmitting required ACA information returns to the IRS.

If you fail to transmit required ACA Forms 1094/1095 electronically by the statutory due date, the IRS assesses severe late-filing penalties under Internal Revenue Code Sections 6721 and 6722. These penalties can accumulate per missing or late return, resulting in thousands of dollars in total fines.

11. Related Forms or Schedules

Form 4423 works alongside several core ACA reporting forms and IRS technical publications, including:

• Form 1094-B – Transmittal of Health Coverage Information Returns
• Form 1095-B – Health Coverage
• Form 1094-C – Transmittal of Employer-Provided Health Insurance Offer and Coverage Information Returns
• Form 1095-C – Employer-Provided Health Insurance Offer and Coverage
• Publication 5164 – Test Package for Electronic Filing of ACA Information Returns
• Publication 5165 – Guide for Electronically Filing ACA Information Returns

12. Frequently Asked Questions (FAQs)

What is an ACA Transmitter Control Code (TCC)?

An ACA TCC is a unique 5-character alphanumeric code assigned by the IRS. It identifies the transmitter and grants security access to submit ACA information returns electronically through the AIR system.

Can domestic U.S. companies use paper Form 4423?

No. U.S.-based organizations with an Employer Identification Number (EIN) are required to submit their ACA TCC application online using the e-Services portal on the official IRS website.

How far in advance should I submit Form 4423?

You should submit Form 4423 at least 45 calendar days before your electronic ACA filing deadline to allow adequate time for processing, TCC assignment, and technical transmission testing.

Do I need to apply for a new TCC every year?

No. Once issued, an ACA TCC remains active indefinitely, provided your organization maintains updated contact details and stays compliant with IRS filing regulations.

What is the role of a Responsible Official on Form 4423?

A Responsible Official is an individual with legal authority to bind the organization contractually. They oversee ACA electronic filing compliance and take responsibility for system security.

What happens if I try to transmit ACA returns without a TCC?

The IRS AIR system will reject any electronic transmission attempt that lacks a valid, active TCC linked to an authorized account, leaving your filings unsubmitted.

13. Conclusion – Key Takeaways

IRS Form 4423 serves as the primary application for foreign organizations seeking an ACA Transmitter Control Code (TCC) to file health coverage information returns electronically. Obtaining a TCC is essential for accessing the IRS AIR system and remaining fully compliant with ACA reporting mandates.

Remember that domestic entities should apply online via IRS e-Services, while foreign filers must allow at least 45 days lead time when submitting paper Form 4423. Planning ahead ensures your TCC is active and tested well before annual tax deadlines.