To change ownership percentages in an S corporation, you transfer shares of stock from one shareholder to another, because each owner’s percentage is simply the number of shares they hold divided by the total outstanding. The transfer has to clear the restrictions in your bylaws and shareholder agreements, respect the eligibility rules that keep the S election alive, be priced defensibly, get formal board approval, and end with updated corporate records and correct tax reporting. Skip any of those pieces and you risk a void transaction, a surprise tax bill, or the automatic termination of the S election itself.
Read the Bylaws and Shareholder Agreement First
Before any shares move, pull the corporation’s bylaws and any shareholder or buy-sell agreements. These documents bind every owner and almost always restrict how stock can be transferred.
The most common restriction is a right of first refusal: a shareholder who wants to sell must first offer the shares to remaining shareholders at the same price and terms an outside buyer offered. A right of first offer goes one step earlier, requiring the seller to invite current owners to bid before shopping the shares outside at all. Some agreements prohibit transfers to anyone outside a defined group or require unanimous consent from existing shareholders.
Buy-sell agreements also govern involuntary changes. Death, divorce, disability, or departure can each trigger a mandatory buyout at a pre-set price or formula. Drag-along rights let a majority owner force minority shareholders into a third-party sale. Tag-along rights let minority shareholders join a sale the majority negotiated. Read every provision before assuming a transfer is straightforward, because a deal that ignores these clauses can be unwound.
Don’t Accidentally Terminate the S Election
This is where most ownership changes go wrong. The S election gives the company pass-through taxation, so profits and losses flow to shareholders’ personal returns instead of being taxed at the corporate level.1Legal Information Institute. Pass-Through Taxation That election survives only while the corporation continues to meet strict eligibility rules. Transfer a share to the wrong owner and the election terminates on the date of the transfer, dropping the company back to C corporation status.
Who Can Hold the Shares
Federal law limits S corporation shareholders to U.S. citizens and resident aliens, certain trusts and estates, and tax-exempt organizations described in Section 501(c)(3).2Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Partnerships, other corporations, and nonresident aliens are prohibited. Transferring even a single share to any of these ineligible owners terminates the S election on the date of the transfer.3Office of the Law Revision Counsel. 26 USC 1362 – Election, Revocation, Termination
The corporation is also capped at 100 shareholders. Married couples count as one, and members of the same family spanning up to six generations from a common ancestor can be treated as one shareholder as well.2Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Bringing in a group of new investors can still push you over the cap if you aren’t counting carefully.
One Class of Stock
Every outstanding share must carry identical rights to distributions and liquidation proceeds. Voting rights can differ, so voting and non-voting shares are fine, but economic rights must be uniform.4eCFR. 26 CFR 1.1361-1 – S Corporation Defined If a transfer agreement gives the buyer preferential distributions or creates a side deal that functions like a second class of stock, the S election is at risk.
Set a Defensible Price
S corporation stock doesn’t trade on any exchange, so the buyer and seller have to agree on a value. If the shareholder agreement includes a formula, such as a multiple of revenue or a book-value calculation, use it. Otherwise, shareholders typically pick between two approaches. An asset-based valuation adds up the fair market value of what the company owns and subtracts what it owes. An income-based approach projects future earnings or cash flow and discounts them to present value.
For larger transactions or transfers between related parties, hiring an independent business appraiser gives you a third-party opinion that holds up if the IRS questions the price later.
Get Board and Shareholder Approval
Most bylaws require the board of directors to pass a resolution authorizing the transfer before it takes effect. The resolution identifies the parties, the number of shares, and the transfer date, and it gives the corporate secretary or transfer agent authority to cancel the old certificate and issue a new one. If the bylaws or a shareholder agreement also require consent from some or all existing shareholders, document that approval separately.
Paper the Transfer
Once the price is set and approvals are in hand, the parties sign a stock purchase agreement. This is the legal backbone of the deal.5Cornell Law School. Stock Purchase Agreement It identifies the buyer and seller, the exact number of shares, and the price. It contains representations and warranties, including the buyer’s confirmation that they are a permitted S corporation shareholder. It sets the payment terms, the closing date, and who bears the risk if a representation turns out to be false.
After signing and payment, the corporation cancels the seller’s old stock certificate and issues a new one to the buyer. If the seller only transferred part of their holdings, they receive a replacement certificate reflecting the reduced ownership.
What the Seller Owes in Tax
Selling S corporation stock is a taxable event, and the tax turns on the seller’s adjusted basis and holding period.
Tracking Basis
Your starting basis is what you originally paid for the stock or contributed to acquire it. From there, basis moves every year the corporation is in business. Income items increase it; losses, deductions, and distributions decrease it. The adjustments happen in a specific order at year-end: basis goes up for income first, then down for distributions, then down for non-deductible expenses, and finally down for losses and deductions.6Internal Revenue Service. S Corporation Stock and Debt Basis
If you haven’t tracked basis every year, reconstruct it before selling. The IRS requires shareholders to report stock and debt basis on Form 7203 with their personal return, and basis calculations have drawn more scrutiny recently. Getting the number wrong means overpaying or underpaying on the sale.
Capital Gains and the Investment Income Surtax
Sale price minus adjusted basis equals your gain. Held for more than a year, the gain qualifies for long-term capital gains rates of 0%, 15%, or 20% depending on your taxable income.7Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed Held for a year or less, the gain is taxed as ordinary income at rates reaching 37%.
High-income sellers add a 3.8% net investment income tax on top. For 2026, the surtax applies when modified adjusted gross income exceeds $250,000 for married couples filing jointly or $200,000 for single filers.8Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax Gain from selling S corporation stock counts as net investment income for this purpose.
Gifting Shares Instead of Selling
Ownership can also shift through a gift, which is common in family succession. The mechanics look similar: transfer restrictions still apply, the recipient still has to be an eligible S corporation shareholder, and corporate records still have to be updated. The tax treatment differs.
A recipient of gifted stock inherits the giver’s adjusted basis rather than getting a fresh basis at fair market value. When they later sell, their gain is measured from your original adjusted basis. If the stock has appreciated substantially, the carryover basis creates a real tax bill for the recipient later.
The gift itself may trigger gift tax reporting for the giver. For 2026, you can give up to $19,000 per recipient per year without filing a gift tax return.9Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Married couples can combine exclusions, transferring up to $38,000 per recipient per year together. Gifts above the annual exclusion aren’t necessarily taxed on the spot, but they eat into your lifetime estate and gift tax exemption.
Update Records and File Correctly
After closing, update the stock ledger, which is the company’s official record of every shareholder, their share count, and the dates of each transaction. The ledger should show the new percentages and the effective date of the transfer.
Reporting on Form 1120-S
A change in ownership doesn’t require a special IRS filing on the day of the transfer. The new structure is reported on the corporation’s annual Form 1120-S, and each shareholder receives a Schedule K-1 reflecting their share of income, deductions, and credits for the year.10Internal Revenue Service. 2025 Instructions for Form 1120-S
When ownership changes mid-year, allocations have to reflect the portion of the year each person actually held stock. The default method assigns each income and loss item to every day of the tax year and then divides that daily amount among the shares outstanding on that day.11eCFR. 26 CFR 1.1377-1 – Pro Rata Share A shareholder who sold their entire interest on June 30 would receive a K-1 reflecting roughly half the year’s activity, weighted by their shares and the exact days held.
There’s an alternative. If a shareholder terminates their entire interest during the year, the corporation can elect to treat the tax year as two separate periods split at the termination date. That election requires the consent of every affected shareholder, including the one who left.11eCFR. 26 CFR 1.1377-1 – Pro Rata Share The two-period approach produces a more accurate allocation when income isn’t spread evenly through the year, such as in a seasonal business that earns most of its revenue in the fourth quarter.
State Filings
State obligations vary. Some states require notice to the secretary of state when ownership changes, particularly if the transfer affects information in the formation documents or annual report. Others only want updated information at the next annual filing. Check the state of incorporation and every state where the corporation is registered to do business; missing a required filing can bring penalties or loss of good standing.