IRS Form 966 — Corporate Dissolution Notice for C-Corps: What It Is, Who Files It, and Why the 30-Day Deadline Is Non-Negotiable
CPA Guide·Written by Arik Rozen, CPA, MBA·Virginia License #025991·Updated 2026
Executive Summary. Form 966 — Corporate Dissolution or Liquidation — is an IRS information return that U.S. C-Corporations must file within 30 days of the date the board adopts a resolution to dissolve. LLCs do not file Form 966. Missing the 30-day deadline does not cancel the obligation — it creates a compliance gap in the dissolution record. Form 966 is a separate requirement from the final Form 1120 and Form 5472, and from state dissolution. All three must be completed to properly close a foreign-owned C-Corporation and permanently terminate IRS filing obligations.
Section I — What Is IRS Form 966?
Form 966, Corporate Dissolution or Liquidation, is an IRS information return required under IRC §6043(a). It notifies the IRS that a corporation has adopted a plan of dissolution or liquidation, identifies the corporation, and provides details about the date and nature of the dissolution plan.
Form 966 is not a tax return. It does not calculate or report income, and no payment accompanies it. Its sole purpose is to formally notify the IRS that the corporation is in the process of dissolving — establishing an official start date for the dissolution in the IRS's records.
Many owners of foreign-owned C-Corporations are unaware of this requirement entirely, or discover it after the 30-day filing window has already closed. For a foreign-owned C-Corporation with active Form 5472 filing obligations, a missing Form 966 is a gap in the dissolution record that can complicate EIN cancellation and final-year filing.
Critical Point
Form 966 is required by IRC §6043(a) — separate from your final Form 1120, separate from state dissolution, and separate from EIN cancellation. Missing it does not eliminate the requirement; it creates a compliance gap that must be addressed as part of the complete dissolution process.
Section II — Who Must File Form 966?
Form 966 is required for U.S. C-Corporations that adopt a plan of dissolution or liquidation. This includes foreign-owned C-Corporations — U.S. corporations with 25% or more foreign ownership that are also subject to Form 5472 reporting requirements under IRC §6038A.
Entity Type | Form 966 Required? | Notes |
C-Corporation | ✓ Yes — required | File within 30 days of board resolution to dissolve |
Foreign-Owned C-Corp | ✓ Yes — required | Also requires final Form 1120 + Form 5472 and EIN cancellation |
S-Corporation | ✓ Yes — required | Dissolution of an S-Corp also triggers Form 966 |
Single-Member LLC | ✗ Does not apply | LLCs are not corporations — Form 966 does not apply |
Multi-Member LLC | ✗ Does not apply | Closing a partnership LLC requires final Form 1065 + K-1 |
LLC vs. C-Corp — Key Distinction
If your foreign-owned entity is organized as an LLC — even if it elected to be taxed as a corporation for other purposes — consult your CPA to confirm whether Form 966 applies to your specific situation. The default LLC structure does not require Form 966. When in doubt, the entity's organizational documents and tax classification control.
Section III — The 30-Day Deadline
Under IRC §6043(a) and current IRS instructions, Form 966 must be filed within 30 days of the date the corporation adopts the plan of dissolution or liquidation.
The clock starts on the date the board of directors formally adopts the resolution to dissolve — not on the date the Articles of Dissolution are filed with the state, not on the date operations cease, and not on the date the owner decides to close the company. The resolution date is the trigger.
What Counts as the Resolution Date?
The resolution date is the date the board formally votes to dissolve the corporation and documents that decision in writing (typically as a board resolution or corporate minutes). This document is placed in the corporation's records and starts two IRS clocks simultaneously:
The 30-day Form 966 clock — Form 966 must be filed with the IRS within 30 days of this date.
The final-year tax period — The corporation's final tax year begins and will end on the dissolution date, which determines the due date of the final Form 1120 and Form 5472.
Common Mistake
Many owners calculate the 30-day deadline from the state dissolution date rather than from the board resolution date. The IRS requires Form 966 within 30 days of the board resolution — which almost always precedes state dissolution by days or weeks. If you are coordinating a dissolution, identify the resolution date first and calculate the Form 966 deadline immediately.
Section IV — What Form 966 Requires
Form 966 is a two-page IRS form. The required information includes:
Required Item | Details |
Corporation's legal name | Exactly as registered with the IRS |
EIN | Employer Identification Number of the corporation |
Address | Corporation's current mailing address on file with the IRS |
Date and place of incorporation | State of formation and date of original Articles of Incorporation |
Date of resolution | Date the board adopted the plan of dissolution |
Description of the plan | Type of dissolution — complete liquidation or partial liquidation |
Certified copy of the plan | A copy of the board resolution or adopted plan of dissolution, attached to the form |
Where to File Form 966
Form 966 is filed with the IRS Service Center where the corporation files its income tax return. For most foreign-owned C-Corporations, this is the Ogden, UT Service Center or the applicable service center for the corporation's state of formation. Confirm the current mailing address in the current IRS instructions for Form 966 before filing.
Section V — Form 966 and the Complete C-Corp Dissolution Sequence
Form 966 is one component of a multi-step dissolution process. For a foreign-owned C-Corporation, the complete sequence is:
01
Board Resolution to DissolveBoard formally votes to dissolve. This date starts the 30-day Form 966 clock. Document the resolution in writing and retain it in corporate records.
02
File Form 966 — within 30 daysFiled with the IRS within 30 days of the resolution date. Attach a certified copy of the board resolution. This is a separate IRS requirement — it does not replace the final tax return.
03
State DissolutionArticles of Dissolution filed with the Secretary of State. A separate engagement from the IRS process. Typically takes 1–4 weeks depending on state.
04
Registered Agent CancellationCancel the registered agent in every state where the corporation is registered. The registered agent continues billing until cancelled and is the corporation's address of record for IRS mail.
05
Final IRS Tax Filing — Form 1120 + Form 5472The final-year Form 1120 and Form 5472, marked as final returns. Any reportable transactions during the final year — including liquidating distributions — must be reported on the final Form 5472.
06
EIN CancellationWritten request to IRS Cincinnati formally closes the EIN account. Required — not optional. The IRS issues written confirmation of closure, which is the only document that definitively terminates Form 5472 filing obligations.
07
U.S. Mailing AddressPost-closure mailing address to receive IRS and state correspondence — penalty clearance letters, refund notices, audit correspondence — that arrives months or years after dissolution.
Important Sequence Note
Form 966 must be filed before or at the same time as the final Form 1120 filing — it cannot be filed after EIN cancellation, because EIN cancellation closes the IRS account. File Form 966 as soon as possible after the board resolution, well within the 30-day window, so that it does not delay the broader dissolution process.
Section VI — What Happens If You Miss the 30-Day Deadline
Missing the 30-day Form 966 deadline does not eliminate the filing obligation. The IRS can assess penalties for late or missing Form 966 filings under applicable provisions. A missing Form 966 also creates a compliance gap in the dissolution record — the IRS has no formal notice that the corporation adopted a dissolution plan, which can complicate the EIN cancellation process and the final-year return review.
If the 30-day deadline has already passed, the correct approach is to:
File Form 966 as soon as possible, with a cover explanation noting the resolution date and the reason for the late filing.
Include a Reasonable Cause statement where grounds exist — explaining why the 30-day deadline was missed and demonstrating that the failure was not willful neglect.
Coordinate the late Form 966 with the final Form 1120, Form 5472, and EIN cancellation as part of a complete closure engagement.
For foreign-owned C-Corporations, the late Form 966 is handled as part of the complete dissolution engagement — not in isolation — so that all components of the closure are coordinated and filed in the correct sequence.
Section VII — Form 966, Form 5472, and the Final Year
For foreign-owned C-Corporations, Form 966 does not resolve the Form 5472 obligation. The two requirements are independent.
The Form 5472 obligation for a foreign-owned C-Corporation continues until:
All outstanding Form 5472 returns for every year of the corporation's existence have been filed, including the final year.
The final Form 1120 and Form 5472 — marked as final returns — have been submitted to the IRS.
The EIN has been formally cancelled with the IRS in writing and the IRS has issued written confirmation of closure.
Filing Form 966 establishes the formal dissolution date in IRS records. It does not substitute for, and does not terminate, the annual Form 5472 filing obligation. The Form 5472 obligation is terminated only by EIN cancellation with written IRS confirmation.
Critical Point
A foreign-owned C-Corporation that files Form 966 and completes state dissolution, but does not file the final Form 1120 and Form 5472 and does not cancel the EIN, remains subject to the $25,000 annual Form 5472 penalty under IRC §6038A(d)(1) for every year the IRS account remains open.
Frequently Asked Questions
Does an LLC need to file Form 966?
No. Form 966 applies to corporations — C-Corporations and S-Corporations. An LLC organized as an LLC does not file Form 966, regardless of its ownership or activity. Closing a foreign-owned single-member LLC requires a final Form 5472 and pro forma Form 1120, state dissolution, and EIN cancellation — but not Form 966.
When exactly does the 30-day clock start?
The 30-day clock starts on the date the board of directors adopts the resolution to dissolve — not the date the Articles of Dissolution are filed with the state, not the date operations cease, and not the date the owner decides to close. Identify the resolution date and calculate the deadline immediately.
What if the board resolution date has already passed and we missed the 30-day window?
File Form 966 as soon as possible with an explanation of the delay, including a Reasonable Cause statement where grounds exist. A late Form 966 is handled as part of the complete dissolution engagement — coordinated with the final Form 1120, Form 5472, and EIN cancellation.
Does filing Form 966 cancel the EIN or terminate the Form 5472 obligation?
No. Form 966 is a notice to the IRS that the corporation is dissolving. It does not close the EIN account and does not terminate the Form 5472 filing obligation. EIN cancellation — with written IRS confirmation — is what terminates the Form 5472 obligation. The two steps are separate and sequential.
Does Form 966 replace the final Form 1120?
No. Form 966 is an information notice — it does not replace the final Form 1120 (the final income tax return) or the final Form 5472. All three must be filed. The final Form 1120 and Form 5472 are marked as final returns and are filed separately with the Ogden, UT Service Center.
Does completing state dissolution take care of the Form 966 requirement?
No. State dissolution and the Form 966 filing are two completely separate requirements with two separate agencies. State dissolution is filed with the Secretary of State. Form 966 is filed with the IRS. Both must be completed as part of a proper dissolution — but filing one does not satisfy or replace the other.
Is Form 966 required if the corporation had no activity in the final year?
Yes. Form 966 is triggered by the adoption of a plan of dissolution — not by the level of corporate activity. A corporation with no income or transactions in the final year is still required to file Form 966 within 30 days of the board resolution to dissolve, and still required to file a final Form 1120 (and Form 5472 if applicable) for the final tax year.
Related Guides
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Written and reviewed by Arik Rozen, CPA, MBA — Head of Tax Filing Department, Form5472.online | Virginia Board of Accountancy License #025991 | IRS PTIN Holder. Form5472.online is not affiliated with the IRS. Federal tax requirements are determined by applicable federal law, Treasury Regulations, IRS instructions, and IRS procedures. This article is for informational purposes only and is not a substitute for current IRS guidance or analysis of a taxpayer's individual facts. Verify all requirements against the current IRS instructions for Form 966 applicable to your tax year.
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