Yes, of course. But Bernie is talking about returning to sky-high rates while removing loopholes.
But it’s more than that. Notice in the corporate data the effective tax rate has dropped from 40% in 1987 to about 17% today, and that counts all tax avoidance loopholes. In 1987 corporate taxes collected 1.7% of GDP. Today, it’s 1.9%. Why didn’t overall taxes go down by as much as the effective tax rate? I really don’t know. Higher corporate profits? Changes in corporate structure? I really don’t know.
That’s part of my point - there aren’t enough people in the highest brackets to really return that much revenue.
But there’s more going on here. I think it’s very striking that U.S. tax revenue has remained remarkably flat over 50 years while major changes to the tax code in both directions have taken place. It’s almost like it’s an emergent property of a complex system that has feedback - change the dial, and it will counteract the change. I have no idea why that’s the case, and I’m not sure anyone else does, either. But the fact remains that regardless if Jimmy Carter, Ronald Reagan, George Bush or Barack Obama is president, and tax rates fluctuate dramatically, overall tax revenue really doesn’t seem to change much. There’s no basis to assume that you can jigger taxes and push overall revenue up by more than a couple of percentage points of GDP.
By far the more important factor is the health of the economy. The big moves in tax revenue happen during recessions and booms. For example, tax revenue was 10.7% of GDP in 2007, and had dropped all the way down to 7.3% of GDP by 2010. Some of that was tax cuts, but not that much. Mostly it was the recession. By 2013 tax revenue was back to 8.9% of GDP.
In comparison, between 1986 and 1988 the top marginal bracket was lowered from 50% to 28%, and personal tax revenue went from 7.7% to 7.8%. It had basically no effect on revenue at all.
Since revenue is so closely correlated with economic performance, it may be that raising taxes simply lowers GDP by an offsetting amount, and vice versa. I believe the widely cited Romer and Romer paper on exogenous tax increases basically came to this conclusion - that raising taxes simply results in an offsetting decline in GDP growth.
It could also be that in a world of globalization and floating exchange rates, changes to taxation levels just cause trade patterns to change and profits to shift around rather than being captured by the government raising the taxes. Raising the tax on a manufacturer does no good if it forces the manufacturer to relocate to China. Raising payroll taxes does no good if it forces enough people out of work and makes them tax consumers rather than generators. And so it goes.
Show me any evidence that an increase like the one you propose will raise any new revenue at all, let alone enough to pay for Bernie’s long wish list. You can look at the cites I posted for historical tax rates and historical revenue. I see no correlation between them whatsoever. Changing rates seem to be absorbed by the economy and the result is modifications that keep revenue about where they were before.