Published for www.dmarron.com, October 17, 2012
Governor Romney has proposed roughly $5 trillion in tax cuts, but he doesn’t want to reduce overall tax revenues. He hopes to generate some revenue by boosting the economy, but even if that works, he will need trillions of dollars of “base broadeners” — i.e., offsetting tax increases. Like most politicians, he’s been vague about what those base broadeners might be. But in the past few weeks, he has discussed the idea of capping the amount of itemized deductions taxpayers can take, perhaps to $17,000, $25,000, or $50,000.
How much revenue could you raise by doing this? My colleagues at the Tax Policy Center just released some estimates of this. As noted by Bob Williams:
Eliminating all itemized deductions would yield about $2 trillion of additional revenue over ten years if we cut all rates by 20 percent and eliminate the AMT [DM: two key aspects of Romney's tax proposal]. Capping deductions would generate less additional revenue, and the higher the cap, the smaller the gain. Limiting deductions to $17,000 would increase revenues by nearly $1.7 trillion over ten years. A $25,000 cap would yield roughly $1.3 trillion and a $50,000 cap would raise only about $760 billion.
Capping itemized deductions at $25,000 would thus produce about one-quarter of the revenue needed to offset Governor Romney’s tax cuts, and completely eliminating them (which he has not suggested) would cover about 40% of the revenue needed.