A key theme of our Options for Reforming America’s Tax Code 2.0 is that tax policy is a matter of trade-offs. For example, expanding the generosity of tax credits for lower-income individuals can help make the tax code more progressive, but it also reduces federal revenue. Pairing a credit expansion with a tax offset may sustain federal revenue but can also hamper economic growth.

Take, for example, the option to restructure the Child Tax Credit (CTC) and the Earned Income Tax Credit (EITC) based on a bill introduced by Sen. Mitt Romney (R-UT) this year.

The option would provide an expanded child benefit of $4,200 per child under 6 and $3,000 per child for those ages 6 to 17. It would eliminate the Child Tax Credit’s minimum income requirements and phase out for taxpayers earning more than $200,000 (filing single) or $400,000 (married filing jointly). The Earned Income Tax Credit would also be restructured to provide a maximum credit of $1,000 per adult and an extra $1,000 for households with dependents. In all, it would reduce federal revenue by about $1.4 trillion over 10 years.

One way to offset that cost would be to eliminate the state and local tax (SALT) deduction, which is capped at $10,000 through 2025 and tends to benefit higher-earning households. Repealing the deduction entirely would raise about $1.5 trillion over 10 years—enough to finance the cost of the credit expansion option in the long run, and, on a conventional basis, result in a net revenue gain in the long run.

Restructuring the individual tax credits and eliminating SALT would also make the tax code more progressive. The after-tax income of the bottom 20 percent of tax filers would rise by 5.5 percent in 2022 on a conventional basis and by 2.7 percent in the long run when including the economic impact.

After-tax incomes would drop for the top 10 percent of tax filers due to the SALT deduction repeal. The top 1 percent would see a 0.2 percent decrease in after-tax income in 2022. After 2025, the current law SALT deduction cap of $10,000 expires, which means that full repeal would reduce the top 1 percent’s after-tax income further to 2.9 percent in 2031.

Combining the two options would have a negative impact on the U.S. economy. Eliminating the SALT deduction raises marginal tax rates on filers who itemize their income tax returns, which reduces incentives to work and invest. The net effect would reduce long-run GDP by 0.6 percent, eliminate about 404,000 full-time equivalent jobs, and reduce the U.S. capital stock by 0.9 percent.

While restructuring the Child Tax Credit and Earned Income Tax Credit along with repealing the SALT deduction would raise revenue slightly and make the tax code more progressive, it comes at the trade-off of reduced economic growth. This is a good example of how tax policy changes require making difficult decisions on which trade-offs to prioritize for economic growth, tax distribution, and federal revenue.

Options for Reforming America’s Tax Code 2.0