How to Sell Shares in a Private Company: Legal Steps and Taxes

Selling shares in a private company is a legal process, not a market transaction. To sell shares in a private company you have to clear the transfer restrictions in your shareholder agreement, qualify for a federal securities law exemption, agree on a price backed by a formal valuation, sign a share purchase agreement, close the transfer through the company’s records, and report the gain on your taxes. Skipping any of these steps can void the sale or expose you to a lawsuit, and getting the tax planning right can be worth millions if your stock qualifies for the small business stock exclusion.

Check Your Shareholder Agreement First

Before you look for a buyer, read the company’s bylaws and any shareholder agreement you signed. Almost every private company puts contractual limits on who can buy shares and how a sale has to proceed. Ignoring those limits does not just slow the deal down. It can void the transaction and give the company or other shareholders grounds to sue you.

The most common restriction is a right of first refusal. Once you find an outside buyer and agree on terms, the company or existing shareholders get the chance to buy your shares on those same terms before the outside deal can close. You cannot skip this step. A related mechanism is a right of first offer, which flips the sequence: you have to offer the shares to insiders first and let them name a price before you shop the shares externally.

Beyond these preferential rights, the board of directors usually has to approve any share transfer. Board approval is the final checkpoint confirming that the proposed buyer is acceptable and that all internal and regulatory requirements have been met. Some agreements also include lock-up periods that prohibit sales entirely for a set number of months or years after the shares were issued.

Qualify for a Securities Law Exemption

Shares in a private company are almost always “restricted securities” under the Securities Act of 1933. They were issued in a private transaction that was never registered with the SEC, so reselling them requires an exemption from federal registration. Getting the exemption wrong creates real legal liability for both sides of the deal.

Rule 144

Rule 144 is the most commonly used exemption for reselling restricted securities. It works as a safe harbor: if you meet all its conditions, the SEC will not treat your resale as an unregistered offering. For shares in a company that does not file reports with the SEC, which describes most private companies, you must hold the shares for at least one year before reselling them under Rule 144.¹ Additional conditions apply if you are a company insider or affiliate, including limits on the volume of shares you can sell in any three-month period.

Section 4(a)(7)

If you cannot satisfy Rule 144, Section 4(a)(7) of the Securities Act offers an alternative exemption built specifically for private resales. The main requirements are selling only to accredited investors, avoiding any general advertising or solicitation, and giving the buyer specified information about the company, including financial statements and details about its officers and business operations.² The shares must also have been authorized and outstanding for at least 90 days before the transaction.

State Blue Sky Laws

A federal exemption is not enough on its own. Each state has its own securities laws, often called blue sky laws, that can impose separate registration or notice filing requirements on the resale of private shares. You have to satisfy the securities laws in each state where you and your buyer are located. The specifics vary, so confirm compliance with counsel in the relevant jurisdictions before you close.

Get Spousal Consent if You’re in a Community Property State

In the nine community property states — Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin, plus Alaska where couples can opt in — shares acquired during the marriage may be jointly owned no matter whose name is on the certificate. Transferring shares without your spouse’s written consent invites a later challenge to the transaction. Most shareholder agreements handle this with a spousal consent form signed up front. If that step was skipped, get consent before closing.

Set a Defensible Price

There is no public trading price for your shares, so you need a formal valuation. You and the buyer will rarely land on a number instantly. The negotiation usually turns on which valuation method to use and the assumptions inside the calculation.

Three approaches dominate:

The income approach calculates the present value of the company’s expected future cash flows. The most common version is a discounted cash flow analysis, which projects revenue and expenses forward and discounts them back using a rate tied to the investment’s risk. A higher discount rate produces a lower valuation, so expect the buyer to push for a high one.
The market approach values the company by looking at recent transactions involving similar businesses. It works well when strong comparables exist, though finding a truly comparable private company sale is harder than finding one among public companies.
The asset approach values the company at the fair market value of its assets minus liabilities. It suits asset-heavy businesses or companies facing liquidation and tends to undervalue companies whose worth is in intellectual property or growth potential.

If the company has issued stock options, it probably already has a Section 409A valuation on file: an independent appraisal of the common stock that sets the minimum strike price for employee options. A 409A number is a useful data point, but it values common stock for compensation purposes and may not reflect what a buyer would pay for a controlling or significant minority stake. A credible acquisition offer or secondary sale can itself signal that the existing 409A valuation is stale.

Negotiate the Share Purchase Agreement

The share purchase agreement is the central legal document. It sets the price, the payment structure, the number of shares moving, and the conditions each side has to meet before closing.

Two provisions inside the SPA deserve close attention. Representations are factual statements you make about the company and the shares: that the company is properly incorporated, that you have clear title to the shares, that there is no undisclosed litigation. Warranties are your promise that those statements are true. If a representation turns out to be false after closing, the buyer can sue for the resulting losses.

Disclosure schedules are how you limit that exposure. These attachments to the SPA list specific exceptions to your representations, such as known lawsuits, existing liens, or unusual contract terms. Anything properly disclosed generally cannot form the basis of a later breach claim. This is where most post-closing disputes originate, and cutting corners on disclosure is one of the fastest ways to end up in litigation.

Due Diligence and Risk Allocation

The buyer’s due diligence process tests whether your representations hold up. Expect requests for financial statements, tax returns, material contracts, intellectual property records, employee agreements, and any pending or threatened litigation. If the buyer finds problems, the response is rarely to walk. More often the buyer pushes for a price reduction, specific indemnification for the identified risk, or both.

Indemnification Caps, Baskets, and Escrow

Indemnification provisions decide how much you can owe the buyer after closing if a representation turns out to be false. Nearly all private share sales include a cap on your total exposure. In most transactions the cap falls below the full purchase price, and a significant number of deals set it between 1% and 10% of the price.

Below the cap, most deals include a basket, a minimum loss threshold the buyer has to reach before you owe anything. A deductible basket means you only pay for losses above the threshold, which sellers prefer because it eliminates liability for small claims. A tipping basket means that once losses cross the threshold, you are on the hook from the first dollar. Certain fundamental representations, like your ownership of the shares or the company’s proper incorporation, are typically carved out from both the cap and the basket, leaving you with unlimited exposure on those core promises.

To give indemnification real teeth, a portion of the purchase price is usually deposited into escrow at closing rather than paid straight to you. If the buyer discovers a breach during the survival period, the buyer can claim against the escrow without having to chase you down. The survival period for most representations and warranties runs about 18 months after closing, though fundamental representations often survive for three to five years. Whatever is left in escrow after the survival period expires is released to you.

Close the Transfer and Update the Records

Closing is the moment the transaction becomes final. Documents are signed, funds are transferred, and ownership changes hands, often virtually through exchanged PDFs and wire transfers rather than a physical meeting. You deliver the endorsed stock certificate or authorize the electronic transfer of the ownership record, and the buyer wires the purchase price to you or the escrow agent.

For shares in a company that does not file SEC reports, your attorney may need to send a legal opinion letter to the company’s transfer agent confirming that the transaction qualifies for a securities law exemption. That opinion lets the transfer agent process the ownership change and, where applicable, remove the restrictive legend from the shares.³

After closing, the corporate secretary updates the stock ledger, the official record of who owns shares, to reflect the cancellation of your certificate and the issuance of new shares to the buyer. The capitalization table is amended to show the new ownership percentages. These steps are not optional. Until the ledger and cap table are updated, the buyer’s ownership rights remain incomplete from a corporate governance standpoint.

Report the Sale and Pay Capital Gains Tax

Profit from selling private company shares is subject to capital gains tax, and the rate depends on how long you held the stock. For 2026, shares held one year or less produce short-term capital gains taxed at ordinary income rates, which run up to 37% federally.⁴

Shares held longer than one year qualify for long-term capital gains rates. For 2026 single filers:

0% on taxable income up to $49,450
15% on taxable income from $49,451 to $545,500
20% on taxable income above $545,500

For married couples filing jointly, the 15% rate applies up to $613,700 in taxable income, and the 20% rate kicks in above that threshold.⁴

If your modified adjusted gross income exceeds $200,000, or $250,000 for married couples filing jointly, you also owe an additional 3.8% net investment income tax on top of the capital gains rate.⁵ Combined with the 20% long-term rate, a high-income seller’s effective federal rate on the gain can reach 23.8%.

Your taxable gain equals the sale proceeds minus your cost basis, which is the original amount you paid for the shares plus any additional capital contributions. Founders who took shares at incorporation for nominal par value, often fractions of a penny per share, will have a cost basis near zero, meaning nearly the entire sale price is taxable gain.

Private stock sales usually do not generate a Form 1099-B, so you are responsible for tracking and reporting the transaction on your own. Report the sale on Form 8949 and carry the totals to Schedule D of Form 1040.⁶

Check for the Qualified Small Business Stock Exclusion

The most valuable tax benefit available to private company sellers is the qualified small business stock exclusion under Section 1202 of the Internal Revenue Code. If your shares qualify, you can exclude up to 100% of the gain from federal income tax, which can save millions of dollars on a large sale.

To qualify, all of the following must be true:

The stock was issued by a domestic C corporation. S corporations, LLCs, and partnerships do not qualify.
You acquired the stock directly from the company in exchange for money, property, or services, not from another shareholder on a secondary market.
For stock issued on or before July 4, 2025, the company’s aggregate gross assets could not exceed $50 million at the time of issuance. For stock issued after that date, the threshold is $75 million, with inflation indexing beginning in 2027.⁷
You held the stock for more than five years.
The company used at least 80% of its assets in an active trade or business during substantially all of your holding period. Hospitality, finance, farming, mining, and professional services are excluded.

The exclusion is capped at the greater of $10 million per issuer or ten times your adjusted basis in the stock sold.⁷ For stock acquired after September 27, 2010, the exclusion rate is 100%, wiping out the federal capital gains tax on the eligible gain entirely. Keep detailed records showing the company met each QSBS requirement throughout your holding period. The IRS can challenge the exclusion years later, and reconstructing compliance evidence after the fact is hard.

Defer the Tax With a 1045 Rollover or Installment Sale

Section 1045 Rollovers

If your shares qualify as QSBS but you have held them for at least six months rather than the full five years, you can defer the gain by reinvesting the proceeds into replacement QSBS within 60 days of the sale.⁸ Gain is recognized only to the extent the sale proceeds exceed the cost of the replacement stock. Your basis in the new stock is reduced by the deferred gain, so the tax is postponed rather than eliminated. The 60-day window is strict and cannot be extended, so plan the reinvestment before you close.

Installment Sales

If the buyer pays in installments rather than a lump sum, you can spread gain recognition across the years payments are received instead of owing the full tax in the year of sale. Private company stock qualifies for installment sale treatment because it is not traded on an established securities market.⁹ Each payment is split proportionally among return of basis (not taxed), capital gain (taxed at the applicable rate), and interest income (taxed as ordinary income). You can elect out of installment treatment if recognizing the whole gain upfront makes more sense, which sometimes happens when current-year rates are favorable or you have losses available to offset the gain.

Selling Through a Secondary Market Platform

Online platforms like Forge Global and EquityZen run organized marketplaces for shares in private companies, mostly late-stage startups approaching an IPO. They handle much of the transaction infrastructure: matching buyers and sellers, facilitating price negotiation, and managing closing. They do not eliminate any of the legal requirements above. The shares are still restricted securities, and you still have to qualify for a federal exemption such as Rule 144 or Section 4(a)(7).² State securities laws still apply unless the company files reports with the SEC. The platform may verify accredited investor status and handle documentation, but you remain legally responsible for making sure the transfer complies with any restrictions in the company’s shareholder agreement, including rights of first refusal and board approval.

1
U.S. Securities and Exchange Commission. Rule 144 Selling Restricted and Control Securities
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U.S. Securities and Exchange Commission. Private Secondary Markets
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U.S. Securities and Exchange Commission. Restricted Securities Removing the Restrictive Legend
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Internal Revenue Service. Topic No. 409 Capital Gains and Losses
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Internal Revenue Service. Topic No. 559 Net Investment Income Tax
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Internal Revenue Service. Instructions for Form 8949
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Office of the Law Revision Counsel. 26 USC 1202 Partial Exclusion for Gain From Certain Small Business Stock
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GovInfo. 26 USC 1045 Rollover of Gain From Qualified Small Business Stock to Another Qualified Small Business Stock
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Office of the Law Revision Counsel. 26 USC 453 Installment Method