Line 26—Estimated Tax Penalty
If line 27 is at least $1,000 and more than 10% of the tax shown on Form 1041, or the estate or trust underpaid its 2012 estimated tax liability for any payment period, it may owe a penalty. See Form 2210 to determine whether the estate or trust owes a penalty and to figure the amount of the penalty.
The penalty may be waived under certain conditions. See Pub. 505, Tax Withholding and Estimated Tax, for details.