An IRS change of ownership sets off a specific chain of filings whose contents depend on how the deal is structured. A stock sale, an asset sale, and an entity conversion each produce a different set of obligations for the seller and the buyer, and each affects the Employer Identification Number, the final return, employment taxes, and the fate of tax attributes like net operating losses in its own way. The sections below walk through what to file, when, and what shifts underneath the filings.
Does Your EIN Survive the Change
The EIN is the business’s permanent tax identity. Whether it carries over depends on whether the underlying legal entity changes, not on who holds the equity.
A new EIN is required when a transaction creates a fundamentally different legal entity. The IRS lays this out by entity type:1Internal Revenue Service. When To Get a New EIN
- A sole proprietor needs a new EIN when incorporating, forming a partnership, or declaring bankruptcy.
- A corporation needs a new EIN when it receives a new charter from the secretary of state, or when a merger creates a new corporation rather than one surviving entity absorbing another.
- A partnership needs a new EIN when it incorporates, when one partner takes over as a sole proprietor, or when the old partnership ends and a new one begins.
- An LLC needs a new EIN when it terminates and reforms as a corporation or partnership.
The new entity applies on Form SS-4, which can be completed online for immediate issuance.2Internal Revenue Service. About Form SS-4, Application for Employer Identification Number (EIN)
Many ownership changes keep the existing number. A corporate stock sale, even a 100% transfer, keeps the EIN because the corporation itself is unchanged. A partnership keeps its EIN when interests change hands as long as the partnership continues. An LLC that changes its tax election to S-Corporation or corporation status also keeps its number.1Internal Revenue Service. When To Get a New EIN
When the EIN stays but the person in charge changes, the new owner must file Form 8822-B within 60 days to update the “responsible party,” meaning the individual with final authority over the entity’s funds and assets.3Internal Revenue Service. IRS Form 8822-B – Change of Address or Responsible Party – Business This is mandatory for every entity with an EIN, not optional.
Final Returns and Short Tax Years
If the transaction ends the selling entity’s existence, that entity files a final income tax return with the “final return” box checked near the top of the form.4Internal Revenue Service. Closing a Business The return reports income, deductions, and tax liabilities through the transaction date. For a partnership, each departing partner also receives a final Schedule K-1 reflecting their share of income through that date.
A mid-year close produces a short tax year that runs from the normal start date to the closing date. The final return for that abbreviated period is due on the same deadline that would apply if it were a full year. A calendar-year corporation that dissolves on July 15 still files by the regular corporate return deadline measured from its tax year-end, not from the dissolution date.
The deal structure controls whether a final return is even needed. In a stock purchase, the corporation survives as the same taxpayer with new shareholders, and its tax year does not automatically close. In an asset purchase, the selling entity liquidates and files a final return, while the buyer folds the assets into its own structure or a newly formed entity with its own EIN.
Form 8594 for Asset Sales
When a business sells as a group of assets rather than through a stock transfer, both buyer and seller must file Form 8594 with their income tax returns for the year the sale closes.5Internal Revenue Service. About Form 8594, Asset Acquisition Statement Under Section 1060 The form applies whenever goodwill or going concern value attaches, or could attach, to the transferred assets, which covers virtually every operating business sale.
Form 8594 requires both parties to allocate the total purchase price across seven asset classes, from cash and bank deposits at one end to goodwill at the other. The allocation determines how much of the price is taxed at ordinary rates versus capital gains rates for the seller, and how quickly the buyer can depreciate or amortize each asset. Buyer and seller must agree on the allocation, and the IRS scrutinizes mismatches between the two filings.
If the allocation changes later because of earnouts, purchase price adjustments, or resolved contingencies, the affected party files an updated Form 8594 for that year.6Internal Revenue Service. Instructions for Form 8594 – Asset Acquisition Statement Under Section 1060 Missing or incorrect Form 8594 filings can trigger penalties under Internal Revenue Code sections 6721 through 6724 absent reasonable cause.
Dissolving a Corporation
A corporation that dissolves after selling its assets has two filings beyond its final income tax return.
Form 966 notifies the IRS that the corporation has adopted a plan of dissolution or liquidation. It is due within 30 days of the date the board adopts the resolution.7Internal Revenue Service. About Form 966, Corporate Dissolution or Liquidation The form applies to C-Corporations and to S-Corporations that were formerly C-Corporations. An S-Corporation that has never been a C-Corporation does not file it.
Liquidating distributions to shareholders also get reported. Any shareholder who receives $600 or more in money or property as part of a liquidation must receive a Form 1099-DIV showing the distribution.8Internal Revenue Service. Instructions for Form 1099-DIV These are not ordinary dividends. Shareholders treat them as payments in exchange for their stock, so the tax outcome depends on whether the distribution exceeds their basis in the shares.
Employment Taxes Mid-Year
Employment taxes are the most time-sensitive part of an ownership change, and errors hit employees directly through overwithholding. The central issue is preventing workers from being double-taxed on Social Security wages when they move from one employer’s payroll to another in the same year.
When a buyer acquires substantially all the property used in the seller’s business and immediately hires the seller’s employees, the buyer qualifies as a “successor employer.” The successor can credit wages the predecessor paid to those employees earlier in the same calendar year toward the annual Social Security wage base, which is $184,500 for 2026.9Social Security Administration. Contribution and Benefit Base Without that credit, employees would restart at zero and face Social Security tax withholding on wages that have already been taxed once that year.10Office of the Law Revision Counsel. 26 USC 3121 – Definitions The same rule applies to the Federal Unemployment Tax Act wage base.
Both parties file Form 941 for the quarter in which the sale occurs. The seller’s return covers wages paid through the transaction date and should include a statement identifying the new owner, the type of change, and the date it took effect. If the business has permanently closed, the seller checks the final return box on line 17 and notes the last date wages were paid.11Internal Revenue Service. Instructions for Form 941 The buyer picks up filing for wages paid from the transaction date forward.
Employees who work for both the predecessor and successor in the same calendar year can receive W-2s one of two ways. Under the standard approach, each employer issues a separate W-2 for the wages it paid. Alternatively, the two employers can agree under IRS Revenue Procedure 2004-53 to have the successor issue a single W-2 covering all wages paid by both employers during the year.12Internal Revenue Service. Revenue Procedure 2004-53 The single-W-2 approach simplifies filing for affected employees, and under it the successor assumes the predecessor’s entire W-2 reporting obligation for those workers.
Deposits do not pause for the deal. The seller remains responsible for all employment tax deposits on wages paid through the closing date, and those deposits must stay on the normal schedule even as the transaction closes. The buyer picks up liability for wages from the closing date forward. In an asset sale, the seller’s unpaid employment tax liabilities do not automatically transfer to the buyer, although the transferee liability rules described below can change that in some circumstances. Late deposits during the transition are a common and avoidable mistake that triggers immediate failure-to-deposit penalties.
What Happens to NOLs, Basis, and Other Tax Attributes
Buying a corporation often means buying its tax history: net operating losses, built-in gains or losses, and accumulated earnings. The rules on what carries over, and how much is usable, are where most of the deal’s tax dollars sit.
Section 382 and NOL Carryovers
Section 382 of the Internal Revenue Code triggers when one or more shareholders who each own at least 5% of the stock increase their combined ownership by more than 50 percentage points over a rolling three-year testing period.13eCFR. 26 CFR 1.382-2T – Definition of Ownership Change Under Section 382 A 100% stock sale clears the threshold easily; mergers, reorganizations, and some stock issuances can clear it too.
Once an ownership change happens, Section 382 caps how much of the pre-change NOLs the new owners can use each year. The annual cap equals the fair market value of the loss corporation’s stock immediately before the change, multiplied by the federal long-term tax-exempt rate the IRS publishes monthly.14Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-In Losses Following Ownership Change The formula typically produces a far smaller annual deduction than the total losses available, stretching the benefit across many years.
If the new owners fail to continue the acquired business for two years after the change, the annual cap drops to zero and the pre-change losses become permanently unusable. One escape valve exists: if the corporation had a net unrealized built-in gain at the time of the change, recognized built-in gains during the five-year recognition period can lift the annual limitation above the standard formula. Capital loss carryovers and certain tax credit carryovers face the same cap. Any accumulated earnings and profits balance in a C-Corporation transfers to the acquiring entity in a stock purchase, which matters for whether future distributions count as taxable dividends.
Section 382 mostly affects C-Corporations with accumulated losses. An S-Corporation that was formerly a C-Corporation and still carries NOLs from those years can also be caught, but S-Corporations that have always been S-Corporations rarely face Section 382 issues because their losses pass through to shareholders instead of accumulating at the entity level.
Basis Step-Up and Section 338
Deal structure also controls whether the buyer gets a fresh depreciation schedule. In an asset purchase, the buyer takes a new tax basis in each asset equal to the allocated purchase price, resetting the depreciation clock. In a stock purchase, the buyer inherits the corporation’s existing, usually lower, basis in its assets and gets less depreciation going forward.
A buyer who wants asset-sale depreciation without actually buying assets can elect under Section 338 to treat a qualifying stock purchase as an asset acquisition. The corporation is treated as if it sold all its assets at fair market value and then repurchased them, which produces the basis step-up but triggers an immediate tax on the deemed sale.15Office of the Law Revision Counsel. 26 USC 338 – Certain Stock Purchases Treated as Asset Acquisitions The election goes on Form 8023.16Internal Revenue Service. About Form 8023, Elections Under Section 338 for Corporations Making Qualified Stock Purchases
Partnership Basis Adjustments
A sale of a partnership interest can trigger a basis adjustment under Section 743(b) when a Section 754 election is in effect. The adjustment benefits only the buying partner, giving them a stepped-up or stepped-down basis in their share of partnership assets with a separate depreciation schedule.17Office of the Law Revision Counsel. 26 USC 743 – Special Rules Where Section 754 Election or Substantial Built-In Loss The partnership itself continues; the Tax Cuts and Jobs Act repealed the old “technical termination” rule that used to end a partnership whenever 50% or more of capital and profits interests changed hands within twelve months.
Transferee Liability for the Seller’s Unpaid Taxes
Buyers often assume that purchasing assets rather than stock insulates them from the seller’s tax problems. It does not, always. Under Section 6901 of the Internal Revenue Code, the IRS can assess the seller’s unpaid income tax liability against a “transferee” of the seller’s property.18Office of the Law Revision Counsel. 26 USC 6901 – Transferred Assets The rule applies when the seller receives assets in exchange for the business and then fails to pay the resulting taxes.
The IRS does not have to prove fraud. If the transfer left the seller without enough assets to pay its tax obligations, the buyer can be held liable up to the value of what it received. That makes tax due diligence before closing non-optional. Review the seller’s filed returns, verify that all employment taxes have been deposited, and consider requesting the seller’s IRS account transcripts. At the state level, many jurisdictions have separate bulk-sale notification requirements and offer tax clearance certificates that protect buyers from inheriting state tax debts. These rules vary by state, and skipping them can create liability that no amount of federal compliance will cure.