For much of the last eight years, the majority Republicans pushed through tax break after tax break that mostly benefited the wealthy. Now in the majority, Democratic lawmakers have failed to stop yet another tax benefit for the richest of the rich from taking effect in 2010.

The tax in question is the estate tax, which President George W. Bush and Republicans and some Democrats in Congress were determined to cut from the day Mr. Bush took office in 2001. Even then, the tax hit only a tiny portion of Americans, but estate-tax foes sold Americans a myth about a “death tax” that prevented average people from passing on hard-earned money.

The result was a measure that made big reductions in the federal estate tax, phased in through 2009, and then repealed the tax, for one year only, in 2010. After that, the tax is to be reinstated at pre-2001 levels. Writing the law in that convoluted way helped to mask the true costs. It also created an untenable situation in which a one-year repeal is followed by reinstatement.

There was a giant catch, as well. In 2010, the one-year repeal of the estate tax is coupled with a new tax that will hit smaller estates. That tax could affect up to an estimated 70,000 estates next year, compared with the current estate tax law, which applies to about 5,500 estates annually. If that sounds wacky, it is. It would also be harmful to many small family businesses, precisely the group that estate-tax cutters say they want to help.