The tax consequences of disincorporation start with a rule that catches many owners off guard: the IRS treats winding down a corporation as if the company sold every asset at fair market value on the way out the door. For a C-corporation, that produces tax at two levels — once inside the company and again on the shareholder’s stock. For an S-corporation, the gain generally passes through to shareholders, but a former C-corp that elected S status within the last five years faces a corporate-level built-in gains tax on top of that. Converting to an LLC does not sidestep any of this. On the filing side, the clock starts fast: Form 966 is due within 30 days of adopting the plan to dissolve.
How the Double Tax Works for a C-Corporation
Under Section 336, the corporation recognizes gain or loss on each asset as if it had been sold at fair market value, whether the asset is cashed out or handed to a shareholder in kind.1Office of the Law Revision Counsel. 26 U.S. Code 336 – Gain or Loss Recognized on Property Distributed in Complete Liquidation Gain equals fair market value minus adjusted tax basis. The net gain is taxed at the flat 21% corporate rate.
The shareholder tax comes next. Under Section 331, everything a shareholder receives in a complete liquidation is treated as payment in exchange for the stock.2Office of the Law Revision Counsel. 26 USC 331 – Gain or Loss to Shareholder in Corporate Liquidations The shareholder compares the value received against the adjusted basis in the stock and reports the difference as a capital gain or loss. For 2026, long-term capital gains rates run from 0% to 20%, and higher-income shareholders also owe the 3.8% net investment income tax.
A worked example makes the arithmetic concrete. A corporation owns commercial real estate with a $100,000 basis and a $500,000 fair market value. On liquidation, the corporation recognizes $400,000 of gain and pays $84,000 in corporate tax. That leaves $416,000 to distribute. A sole shareholder with a $50,000 stock basis then recognizes a $366,000 capital gain personally. Between the two levels, more than a third of the original appreciation can go to tax.
Losses Do Not Always Get Recognized
The deemed-sale rule runs in both directions, but Section 336 disallows losses in specific situations. The corporation cannot deduct a loss on property distributed to a related party (broadly, a shareholder owning more than 50% of the stock) if the distribution is not pro rata, or if the property was contributed to the corporation within the five years before the distribution.3Office of the Law Revision Counsel. 26 U.S. Code 336 – Gain or Loss Recognized on Property Distributed in Complete Liquidation – Section: Limitations on Recognition of Loss Contributions made within two years of adopting the liquidation plan are presumed to have been made for that purpose.
Depreciation recapture shifts the character of some gain as well. If the corporation claimed depreciation on equipment or real property, some or all of the gain on that property is reclassified as ordinary income rather than capital gain, and it is taxed at ordinary rates.4Internal Revenue Service. Publication 544 – Sales and Other Dispositions of Assets
S-Corporations and the Built-In Gains Trap
Because an S-corporation is a pass-through, the deemed-sale gains and losses on liquidation flow to shareholders through Schedule K-1 and are reported on their individual returns.5Internal Revenue Service. About Form 1120-S, U.S. Income Tax Return for an S Corporation That pass-through gain also increases each shareholder’s stock basis, which reduces the capital gain recognized when the liquidation distribution is compared to that adjusted basis. In many pure S-corp liquidations, the corporate level is essentially free.
The exception is important. If the corporation was once a C-corporation and elected S status less than five years before liquidating, any appreciation that already existed in the assets on the first day of the S-corp year is subject to a 21% corporate-level built-in gains tax under Section 1374.6Office of the Law Revision Counsel. 26 U.S. Code 1374 – Tax Imposed on Certain Built-In Gains Appreciation that occurred after the S election is not caught. The built-in gains tax is paid at the corporate level before the remaining gain passes through on the K-1, so on that pre-conversion slice of appreciation the result looks a lot like C-corp double taxation. Waiting out the five-year recognition period before liquidating can eliminate this cost entirely.
Converting to an LLC Is Still a Liquidation
Reorganizing a C-corporation into an LLC to get pass-through treatment does not avoid any of this. The IRS treats the conversion as a complete liquidation: the corporation recognizes gain on the deemed sale of its assets, and the shareholders recognize gain on the deemed exchange of their stock. The business continues in a new legal form, but the tax bill on all built-in appreciation lands at the moment of the change.
Section 1244 Relief When Shareholders Lose Money
When a liquidation produces a loss on the stock rather than a gain, Section 1244 can convert what would otherwise be a capital loss into an ordinary loss, which offsets wages and business income dollar for dollar instead of being limited to $3,000 a year against ordinary income.7Office of the Law Revision Counsel. 26 USC 1244 – Losses on Small Business Stock
The annual cap on ordinary loss treatment is $50,000 for single filers and $100,000 for married couples filing jointly. Anything above the cap is a capital loss. To qualify, the stock must have been issued directly to the shareholder in exchange for cash or property (not services and not other securities), the corporation must have been a domestic company, and total capitalization at the time of issuance could not have exceeded $1 million. If the criteria are met, ordinary loss treatment is claimed on the shareholder’s return; no separate election is needed.
The IRS Filing Calendar
Several deadlines start running the moment the board adopts a plan to dissolve. Missing them invites penalties and prolongs IRS attention.
Form 966 Within 30 Days of the Plan
The corporation files Form 966 with the IRS within 30 days of adopting a resolution or plan to dissolve, with a certified copy of the resolution attached.8Internal Revenue Service. Form 966 – Corporate Dissolution or Liquidation Any later amendment to the plan requires another Form 966 within 30 days of the amendment.
Final Form 1120 or 1120-S
A C-corporation files its final Form 1120 by the 15th day of the fourth month after the final tax year ends — April 15 for a calendar-year corporation. An S-corporation files its final Form 1120-S a month earlier, on the 15th day of the third month after the final tax year (March 15 for calendar-year filers).9Internal Revenue Service. Starting or Ending a Business Check the “Final return” box on either form.
1099-DIV and Final Schedule K-1
A C-corporation issues Form 1099-DIV to each shareholder who received $600 or more in liquidation distributions, reporting cash and noncash amounts in the designated boxes.10Internal Revenue Service. Instructions for Form 1099-DIV An S-corporation issues a final Schedule K-1 to each shareholder covering the final year’s income, deductions, and credits.11Internal Revenue Service. Instructions for Schedule K-1, Form 1120-S Shareholders use these to calculate basis adjustments and their final capital gain or loss.
Final Payroll Filings
The corporation files a final Form 941 for the quarter in which it paid its last wages, checks the box on line 17 to mark it as final, and attaches a statement naming the person who will keep the payroll records.12Internal Revenue Service. Closing a Business Final W-2s to employees are due by the due date of that last Form 941, and copies must go to the Social Security Administration by the last day of the following month.
Form 8822-B for Responsible Party Changes
Any entity with an EIN must report a change in its responsible party within 60 days using Form 8822-B.13Internal Revenue Service. Form 8822-B – Change of Address or Responsible Party, Business When officers resign during a wind-down, this filing keeps IRS correspondence flowing to someone who will actually receive it.
Tax Exposure That Outlives the Corporation
Filing the final return and closing the state charter does not end federal tax exposure. Under Section 6901, if the IRS later determines the corporation owed taxes that were not paid before dissolution, shareholders who received liquidation distributions can be pursued personally as transferees of the corporation’s assets.14Office of the Law Revision Counsel. 26 U.S. Code 6901 – Transferred Assets Dissolution does not shorten the IRS’s assessment window; the statute of limitations runs as though the corporation still existed. Accurate final returns and adequate reserves for known and contingent tax exposure protect shareholders from being on the hook years later.
Records need to survive too. The IRS requires business tax records to be kept for at least three years from the date the return was filed, six years if gross income was underreported by more than 25%, and seven years if a worthless securities or bad-debt deduction was claimed.15Internal Revenue Service. How Long Should I Keep Records Employment tax records must be kept at least four years after the tax was due or paid. A dissolved corporation’s officers should assign someone to hold the complete file — minutes, financial statements, tax returns, payroll records — for seven years to cover the longest common window.