If you received a penalty notice for underpaying your estimated 1993 taxes and were subject to the new 36% or 39.6% brackets, don't automatically pay the bill, says the Research Institute of America. People who underpaid taxes because of the higher federal rates should not have been penalized. Yet because of a computer glitch, taxpayers in this category who also did not opt to pay the increase in three annual installments may have been sent a penalty notice. Complete and return Form 2210 to have the charge waived.

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