This week in Bidenomics: Those slippery billionaires

Could you please feel outraged? Again?

For the last 10 or 20 years, politicians, mostly Democratic, have been trying to point out some vast inequities in the U.S. tax system. In 2011, President Obama proposed the “Buffett rule,” which would require billionaires such as Warren Buffett to pay taxes at the same rate as middle-class workers. Buffett has long pointed out that he pays a lower tax rate than his secretary, because of the wide disparity in tax rates on regular income and on gains from investments.

The Biden administration this week amplified the case for more aggressive taxation of billionaires. Biden's Office of Management and Budget posted a new analysis on Sept. 23 claiming the richest families in American pay just 8.2% of their income in taxes. Prior studies of this sort have ­­estimated that the wealthiest Americans pay an effective tax rate of 24% to 27%, so it sounds as if billionaires have found new ways to shave their tax bills. The average for all taxpayers is around 14.3% of income paid in federal income taxes.

VAN HORN, TEXAS - JULY 20: Blue Origin’s New Shepard crew (L-R) Wally Funk and Jeff Bezos walk together after flying into space in the rocket on July 20, 2021 in Van Horn, Texas. Mr. Bezos and the crew were the first human spaceflight for the company.   (Photo by Joe Raedle/Getty Images)
VAN HORN, TEXAS - JULY 20: Blue Origin’s New Shepard crew (L-R) Wally Funk and Jeff Bezos walk together after flying into space in the rocket on July 20, 2021 in Van Horn, Texas. Mr. Bezos and the crew were the first human spaceflight for the company. (Photo by Joe Raedle/Getty Images) · Joe Raedle via Getty Images

The Biden analysis, however, has one novel feature: It counts gains on investments as income, even if the owner has not sold those assets and actually profited from the sale. This might sound arcane, but it’s not. I looked at my own retirement and investment accounts and realized that I, too, have unrealized capital gains I haven’t paid taxes on. (For anybody wondering, I’m not a billionaire.) Most Americans with any type of investment account have racked up unrealized capital gains during the last year or two, since stocks have registered blistering returns. But you don’t owe taxes on those gains until you sell the assets, and even then some lower-income Americans don’t owe capital-gains taxes.

Biden’s economists are clearly trying to rile up ordinary taxpayers to raise pressure on Congress to boost billionaire taxes. But Biden himself isn’t fully on board and Democrats in Congress already have cold feet. The key issue is that the federal government taxes income from work and income from investments quite differently. The top tax on labor income is 37%, and Biden wants to raise it to 39.6%. The top tax on capital gains is 20%. Biden wants to raise that to the same level as labor income—39.6% for top earners.

Some Democrats, including Sens. Bernie Sanders and Elizabeth Warren, want to go further by imposing an annual wealth tax on multimillionaires, whether the owner sells the assets or not. Biden opposed a wealth tax during the 2020 president campaign, but he said recently he supports the idea. But that doesn't make it a good idea. As simple as it might sound, a wealth tax would be very difficult to administer and some legal experts think it could be unconstitutional. Raising other taxes already on the books would be more practical and less vulnerable to an inevitable legal challenge.