Racusin mentioned a client whose parents gave him Microsoft Corp. stock when he was younger, purchased for relatively little, that is now worth $6 million. If the man were to die in 2009, his family would not owe capital gains tax on the appreciation. And, with good estate planning by the man and his wife, there might be no estate tax due either, because a couple can shelter up to $7 million from federal estate tax.

If the man were to die on January 1, 2010, however, his wife could owe capital gains of around $340,000 on the $6 million, figuring in a $3 million exemption for spouses, and another $1.3 million exemption for whoever inherits.

As for a retroactive tax, it would likely raise some complications if lawmakers wait too long to enact it. Relatives of some people who die in a prospective estate-tax-free period--after the end of the year but before a new tax is enacted--would surely not be pleased. Quite certainly, some would challenge the constitutionality of the tax, according to tax analysts.

Nonetheless, both the lower courts and the Supreme Court historically have defended retroactive taxes. The high court, in fact, has been upholding retroactive tax increases since as long ago as 1874.

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