The issue is that it is inherently problematic to have a democracy in which a third of filers pay no personal income tax at all (another datum from the IRS), and the entire bottom half of filers, meaning those with adjusted gross incomes below $33,000, have an average tax rate of just 3%.

This deforms the behavior of everyone-the voters who think they aren't paying for Congress's latest bright idea, the politicians who know that promising new programs will always be a winning political strategy with the majority of taxpayers who don't think they have to pay for them, and the wealthy who know that the only way to get politicians to refrain from that strategy is to buy them off.

For once, we face a problem with a solution that costs nothing. Most families who pay little or no personal income taxes are paying Social Security and Medicare taxes. All we need to do is make an accounting change, no longer pretending that payroll taxes are sequestered in trust funds.

Fold payroll taxes into the personal tax code, adjusting the rules so that everyone still pays the same total, but the tax bill shows up on the 1040. Doing so will tell everyone the truth: Their payroll taxes are being used to pay whatever bills the federal government brings upon itself, among which are the costs of Social Security and Medicare.

The finishing touch is to make sure that people understand how much they are paying, which is presently obscured by withholding at the workplace. End withholding, and require everybody to do what millions of Americans already do: write checks for estimated taxes four times a year.

Both of those simple changes scare politicians. Payroll taxes are politically useful because low-income and middle-income taxpayers don't complain about what they believe are contributions to their retirement and they think, wrongly, that they aren't paying much for anything else. Tax withholding has a wonderfully anesthetizing effect on people whose only income is a paycheck, leaving many of them actually feeling grateful for their tax refund check every year, not noticing how much the government has taken from them.