Om 2026, the federal government is on track to spend $7.4 trillion, and $1.9 trillion–about one-quarter of the total–will be newly borrowed money. It’s one thing to have deficit spending during a pandemic or a recession, but neither situation applies here. The accumulated federal debt owed to the public is now equal to 100% of US GDP, approximately matching the previous high set during spending and borrowing to finance World War II, and headed higher. Serious politicians would put some proposals on the table for debate for spending cuts and tax increases to reduce the gap. Kimberly Clausing and Natasha Sarin seek to launch a discussion for the tax proposal side of the debate in “$15 Trillion on the Table in 2029: Ordinary Taxes to Meet an Extraordinary Fiscal Moment.” The essay will appear in a book forthcoming later this year, In The American Economy in a New Era, edited by Melissa S. Kearney and Luke Pardue, and published by the Aspen Institute.
Rather than grapping with the challenges and mechanics of attempting to create a new tax, like a wealth tax, Clausing and Sarin instead on adjustments to existing taxes. However, the taxes they propose will have more effect on those with higher incomes and wealth. They offer five “buckets” of tax revenue.
Bucket 1: Reforming corporate tax to meet the challenges of a modern global economy
The corporate rate could be raised for the largest-profit taxpayers to 27 percent for fewer than 2 percent of firms, with a small surtax of 2.7 percentage points for fewer than 0.5 percent of firms. … The corporate tax base can be broadened to better tax pure profits … Full expensing—which allows investors to completely write off investments as they occur rather than taking deductions as the investment depreciates—achieves the goal of moving the corporate tax to a tax on pure profits, since it does not distort investment decisions in the expensed assets. However, if expensing is allowed, it should be coupled with a complete disallowance of interest deductions. Otherwise, debt-financed investments receive a net subsidy due to the tax system; some investments are undertaken post-tax that would not be profitable absent tax considerations. … The US international minimum tax regime could be strengthened by including a much stronger country-by-country tax on foreign income. Indeed, higher headline corporate rates would need to be coupled with serious international tax reforms to prevent increased international profit shifting from eroding the corporate tax base.
Bucket 2: Investing in the Internal Revenue Service
[A]udit rates for high-income taxpayers collapsed from 16.5 percent to 2 percent between 2010 and 2021. The tax gap has grown to an estimated $870 billion per year, or 2.7 percent of GDP, and the true number is almost certainly larger, given the difficulty of measuring noncompliance at the top of the income distribution.
Bucket 3: Expanding tax efficiency and revenue through new “sin” taxes
Sin taxes have historically referred to taxes on goods like alcohol and cigarettes, where the policy goal was both to collect some revenue and also to discourage the behavior. Clausing and Sarin suggest new sin taxes on gambling and on carbon emissions.
To help curb these kinds of negative effects, we include a gambling tax of 5 percent on the value of sports wagers; we pair this tax with one on prediction market winnings. This gambling levywould generate more than $130 billion over the 2030–2039 budget window. One could also extend sin taxes to other forms of gambling. … The excise tax that raises the most revenue in our suite of options is a tax on carbon emissions. … One approach would be a carbon fee that begins at $40 per metric ton, rises by 5 percent in real terms over the budget window, and then increases with inflation thereafter. This carbon fee is more modest than many legislative proposals that have been floated in US congressional bills … The fee is also lower than that used in many developed economies, including the European Union and Canada …
Bucket 4: Adjusting income tax parameters
Clausing and Sarin propose that US income tax brackets be returned to 1997 levels–that is, a period of rapid economic growth just before the US federal budget was actually in surplus for a couple of years.

Bucket 5: Reforming capital income taxation
Clausing and Sarin propose a package of changes listed here, together which how much revenue would be raised by each in 2030.

An obvious question is why the authors focus on the tax side. What about some proposed spending cuts? One answer is that the authors study tax policy, so they are writing about what they jknow. Another answer is that the US has relatively high debt and relatively low tax revenues. (The number below include not just national-level debt and taxes, but also lower levels of government.)

A final answer is that the authors are certainly open to considering an equivalent set of proposals for spending cuts. Their tax increases total about 3.3% of GDP, or about $1 trillion in the context of the current US GDP. The big categories of federal spending are Medicare, Social Security, defense, and interest payments on past debt. If defaulting on past debt by cutting interest payments is off the table, then it is a heavy lift to propose $1 trillion in spending cuts at a time when an aging population is pushing up Social Security and Medicare spending and an unruly world order seems to call for sustained defense spending. Some subset of these tax increases would be a heavy lift as well. But when the federal government is borrowing one-quarter of what it spends, some real and dramatic changes are needed.
















