For years, estate planning practitioners have encouraged Congress to pass a bill authorizing portability of a married couple’s estate tax exemption (allowing a surviving spouse’s estate to add her deceased spouse’s unused estate tax exemption to her own). Now, with the passage of the Tax Relief, Unemployment Insurance Reauthorization and Job Creation Act of 2010 (the “2010 Act”), estate planning practitioners are now wondering if, instead of being grateful that Congress finally listened, they should be thinking “be careful what you wish for.” Here is our take on the good, the bad and the ugly of portability.

The Good:

Prior to the passage of the 2010 Act,