Stock Buybacks Explained: How They Work and the 1% Federal Excise Tax

A stock buyback, formally a share repurchase, happens when a publicly traded company uses cash to purchase its own shares from the open market or through a tender offer. Once repurchased, those shares are typically retired or held as treasury stock, which reduces the total number of shares outstanding. Buybacks are one of two primary ways companies return capital to shareholders, the other being cash dividends.

How a Buyback Changes the Numbers

Reducing share count does not change a company's total net income, but it does change per-share metrics. If a company earns the same total profit with fewer shares outstanding, earnings per share (EPS) rises mechanically. The same effect can lift book value per share and, all else equal, support a higher stock price relative to earnings. This is why buybacks are sometimes criticized as a way to flatter per-share metrics rather than grow the underlying business, though companies and many economists counter that returning excess cash to shareholders, who can then redeploy it elsewhere, is an efficient use of capital when a company lacks better internal investment opportunities.

Open-Market Purchases vs. Tender Offers

• Open-market repurchases: the company buys shares gradually through its broker, often under a pre-set plan, similar to any other investor.
• Tender offers: the company offers to buy a specific number of shares at a stated price, usually at a premium to the market price, within a set window.
• Accelerated share repurchases (ASRs): the company pays an investment bank upfront for a large block of shares, delivered over time, to retire shares quickly.

To avoid appearing to manipulate its own stock price, a company generally structures open-market buybacks to fit within the U.S. Securities and Exchange Commission's Rule 10b-18 safe harbor, which sets voluntary conditions on timing, volume, price, and the single-broker manner of purchases. Meeting the safe harbor does not guarantee immunity from manipulation claims, but it substantially reduces that risk.

The 1% Federal Excise Tax on Buybacks

The Inflation Reduction Act of 2022 created a new federal excise tax on corporate stock repurchases, codified at Internal Revenue Code Section 4501, effective for repurchases after December 31, 2022. The tax equals 1% of the fair market value of stock a covered corporation repurchases during the taxable year, reduced by the fair market value of any stock the corporation issues during that same year, including shares issued to employees. Covered corporations are domestic companies whose stock is traded on an established securities market.

The IRS has issued guidance, including Notice 2023-2 and subsequent proposed and final regulations, clarifying how the tax is calculated and reported. Corporations generally report and pay the excise tax using Form 720 (the quarterly federal excise tax return) together with Form 7208, which computes the stock repurchase excise tax base.

Key Exceptions and Adjustments

• Repurchases that are part of a tax-free reorganization are generally excluded.
• Stock contributed to an employer-sponsored retirement plan, employee stock ownership plan (ESOP), or similar plan can reduce the taxable base.
• A de minimis exception applies if total repurchases during the year do not exceed $1 million.
• Repurchases by regulated investment companies (RICs) and real estate investment trusts (REITs) are generally excluded from the tax.
• The netting of stock issuances against repurchases means companies that issue significant new equity, for example through employee compensation, can lower or eliminate their net taxable buyback amount.

Buybacks vs. Dividends: A Tax Comparison

For shareholders, the tax treatment of buybacks differs from dividends in an important way. A cash dividend is generally taxable to the recipient in the year it is paid. A buyback does not create an immediate tax event for shareholders who do not sell; only shareholders who choose to sell shares back to the company, or sell in the open market, realize a capital gain or loss at that time, and only on the shares actually sold. This flexibility is one reason some companies and shareholders prefer buybacks, though the new 1% excise tax is borne by the corporation, not distributed shareholders, and can be viewed as a modest offsetting cost that companies weigh against dividends when deciding how to return capital.

What Investors Should Watch

• Whether a buyback is funded by free cash flow or debt, which changes the risk profile of the company.
• The pace of net share reduction after accounting for new share issuance to employees, since heavy stock-based compensation can offset buyback effects.
• Company disclosures in quarterly and annual SEC filings (Forms 10-Q and 10-K) describing repurchase authorizations, amounts spent, and shares retired.
• How the 1% excise tax and any future changes to it might factor into a company's capital-return strategy over time.