What if the political organization fails to file Form 1120-POL? A political organization that fails to file a required Form 1120-POL timely must pay an additional amount equal to 5 percent of the tax due for each month (or partial month) the return is late up to a maximum of 25 percent of the tax due. The minimum penalty for a return that is more than 60 days late is the smaller of the tax due or $135. If you receive a notice about a penalty after you file the return, reply to the notice with an explanation and the IRS will determine if you meet the reasonable-cause criteria. Do not include an explanation when you file your return.