The Trump Tax Break That Could Save Warren Buffett Millions - And What It Means for Everyday Investors

Warren Buffett has spent decades building enormous gains by buying stocks and holding them for the long haul. Now, a capital gains tax change being considered by President Donald Trump could potentially reduce the tax bill on some of those gains.

Trump has expressed interest in indexing capital gains to inflation, which could allow investors to exclude some inflation-driven appreciation when calculating taxable profits. Buffett provides an extreme example of how the change could work, but the same concept matters if you are looking to grow your wealth through long-term holdings.

Trump is considering changing how capital gains are calculated

National Economic Council Director Kevin Hassett said in August that Trump was considering new capital gains policies ahead of the November midterm elections.

Former National Economic Council Director Larry Kudlow said he had recently discussed inflation indexing directly with Trump, revealing that Trump "liked the idea of the indexing." Trump has also shown interest in a bigger exemption for gains on certain home sales.

Neither proposal has become law, and the details could change significantly before anything is enacted.

Still, inflation indexing would represent an important shift in how the government calculates taxable investment gains.

Inflation can currently increase your taxable gain

Under current rules, capital gains are generally calculated using the difference between an asset's sale price and its cost basis. Inflation isn't separately removed from the gain before tax is calculated.

The Bipartisan Policy Center explains that inflation indexing would instead adjust an asset's purchase price upward to account for inflation before determining the taxable capital gain.

Imagine buying $10,000 worth of stock and selling it decades later for $30,000. The nominal gain is $20,000. If indexing increased the original cost basis to $15,000, the amount treated as a gain could instead fall to $15,000.

Supporters argue that this would prevent investors from paying tax on gains that primarily reflect a decline in the purchasing power of the dollar rather than real investment growth.

Buffett's Coca-Cola investment shows how it could work

Buffett's Berkshire Hathaway provides a particularly dramatic example because some of its largest investments have been held for decades.

Berkshire completed its seven-year purchase of 400 million split-adjusted Coca-Cola shares in 1994 at a total cost of about $1.3 billion. That works out to an average cost of roughly $3.25 per share. Coca-Cola's latest proxy filing confirms that Berkshire still held 400 million shares at the end of 2025.

If the government allowed Berkshire to increase that decades-old cost basis to account for inflation, its taxable gain could shrink significantly if it eventually sold the shares.

The important point, however, is that inflation indexing wouldn't erase most of Buffett's gain. Coca-Cola has appreciated far beyond the increase in the general price level since Berkshire began buying it.

Buffett wouldn't suddenly owe zero capital gains tax

Inflation indexing doesn't eliminate genuine investment returns. An adjustment that substantially raises Berkshire's original $3.25-per-share Coca-Cola basis could reduce the gain subject to tax, but the difference between an inflation-adjusted basis and Coca-Cola's current market price would still represent a very large gain.

The biggest proportional benefit could instead go to investments that appreciated only modestly above inflation.

Someone who bought an asset for $100,000 that later rose to $150,000, for example, currently sees a $50,000 nominal gain. If cumulative inflation raised the adjusted basis close to $150,000, little real gain could remain to be taxed.

Wealthier investors could receive the biggest benefits

The proposal wouldn't benefit everyone equally. Yale's Budget Lab estimates that fully indexing capital gains to inflation would give households in the top 0.1% of the income distribution an average tax cut of around $350,000. In contrast, households in the bottom two income quintiles would receive essentially no benefit.

That's partly because higher-income households hold a much larger share of taxable financial assets and realize more capital gains.

The impact would also be different for people whose investments sit inside tax-advantaged retirement accounts such as 401(k)s and IRAs, where buying and selling investments inside the account generally doesn't trigger the same immediate capital gains tax treatment as transactions in a taxable brokerage account.

The proposal could have a substantial cost

Lower taxes on capital gains would also mean less revenue for the federal government. The Budget Lab estimates that applying inflation indexing only to newly purchased assets could reduce federal revenue by about $170 billion over the budget window. Applying the change retrospectively to existing assets could cost almost $1 trillion.

The Committee for a Responsible Federal Budget similarly estimates that inflation indexing could reduce federal revenue by roughly $170 billion to $950 billion through 2035, depending largely on whether existing investments receive the adjustment.

Could Trump do it alone?

Republican lawmakers have pushed the administration to consider implementing inflation indexing without waiting for Congress.

Sens. Ted Cruz and Tim Scott asked the Treasury Department to consider indexing capital gains through regulatory action, while supporters argue that Treasury has enough authority to change how cost basis is defined.

That interpretation is disputed. The Bipartisan Policy Center notes that the central legal question is whether the Treasury could make the change through executive action or whether Congress must amend the tax code.

Bottom line

Inflation indexing could potentially give long-term investors a significant capital gains tax break by removing some inflation-driven appreciation from taxable gains. Warren Buffett's decades-old Coca-Cola stake shows how even a seemingly modest adjustment to cost basis could become valuable when applied across hundreds of millions of shares.

The proposal is still just that: a proposal. Before selling appreciated assets, you may want to check up on your financial health and run the numbers under today's rules rather than assuming that tax bills are about to fall, especially while the administration and lawmakers are still debating how the change would work and whether Trump could implement it without Congress.

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