Chair of the House Ways and Means Committee Dave Camp is soon to roll out a plan for comprehensive tax reform. He is to be commended for doing so. Our tax code is an absolute mess with incentives for all sorts of bad behavior. Early reports suggest, however, that Congressman Camp will also include a “bank tax” to both raise revenue and address the “Too-Big-To-Fail” (TBTF) status of our nation’s largest banks. While the evidence overwhelmingly suggests to me that TBTF is real, with extremely harmful effects on our financial system, I fear Camp’s approach will actually make the problem worse, increasing the market perception that some entities will be rescued by the federal government.

Bloomberg reports the plan would raise “would raise $86.4 billion for the U.S. government over the next decade…would likely affect JPMorgan Chase & Co, Bank of America, Citigroup, Wells Fargo, Goldman Sachs and Morgan Stanley.” The proposal would do so by assessing a 3.5 basis-point tax on assets exceeding $500 billion.

While standard Pigouvian welfare analysis would recommend a tax to internalize any negatives externalities, TBTF is not like pollution, it isn’t something large banks create. It is something the government creates by coming to their rescue. I don’t see TBTF as a switch, but rather a dial between 100 percent chance of a rescue and zero. By turning the banks into a revenue stream for the federal government, we would likely move that dial closer to 100 percent–and that is in the wrong direction. For the same reason, I have opposed efforts to tax Fannie Mae and Freddie Mac in the past. The solution is not to bind large financial institutions and the government closer together, as a bank tax would, but to further separate government and the financial sector. Just over a year ago, I laid out a path for doing so in National Review. Were we to truly end bailouts, limiting government is the only way to get that dial close to zero.

If we want to use the tax code to reduce the harm of financial crises, then we should focus on reducing the preferences for debt over equity, which drive so much of the leverage in our financial system. I’ve suggest such here in more detail. There are also early reports that Camp’s plan will reduce some of these debt preferences. Let’s hope those remain in the plan.