Sorry, there’s no such thing as a “revenue neutral carbon tax.” Or if there is, you’d stumble on it by pure luck:
The most important point is that revenue neutrality is most likely a mirage. We would have to maintain the carbon tax for decades in order to generate the consumption reductions that advocates argue will occur, but FICA rates aren’t static over decades. In 1950 the FICA rate was 1.5%; by 1970 it was 4.8%; by 1990 it had risen to its current rate of 7.65%. It has been stable for about two decades, but meanwhile the programs that it (in theory) funds are in crisis.
Over the next few decades, we should expect to be in bitter political fights over changing retirement ages, benefit levels, access to publicly-funded medical care, tax rates, and other measures designed to make these programs financially stable. The FICA rate will not be insulated from this process. Who could possibly say that when it has increased in irregular and unpredictable steps to, say, 15.3 percent between now and 2028 in response to various political crises, that, but for the carbon tax, it would otherwise have been 16.5 percent?
I’ve previously discussed this conceit of politicians that they can predict the economic effects of their nostrums:
When a politician says that he’s going to either cut or increase your taxes, he is engaging, wittingly or not, in a conceit and a deceit. He says it as though he has the power to do any such thing, when in fact he does not. He has no power except to reduce or increase the rate at which you pay taxes, whether on property, income, or whatever.
Think of it as the difference between a joystick and a mouse. With a computer mouse, you can point directly to the place that you want to be on a screen. With a joystick, you can only control the rate at which you move toward it, and in so doing, the target may move, and it may move faster or in a different direction than you can keep up with using your rate control. Politicians talk about tax cuts as though they have a computer mouse that allows them to pass a law and a specified amount of revenue will roll in, but the reality is that they have a slow joystick, with a nebulous relationship to the eventual goal.
As Manzi says, TANSTAAFL. I think that dropping both sides of the payroll tax until the economy recovered would have been a hell of an instant stimulus, but eventually, that money’s got to be put back into the system.