So I'm 7 days late paying my $75 MT aircraft registration and got whacked with a $375 late fee. Yes that's a 500% late fee for 7 days late. Anyone able to fight this? Is there a group trying to fix this injustice? I did find a statute (15-1-216) that says "A person who fails to file a required tax return or other report with the department by the due date of the return or report...a late payment penalty of 0.5% a month on the unpaid tax. The penalty may not exceed 12% of the tax due" I interpret "or other report" to include aircraft registration tax. This would cap the late fee at 12%. Unbelievable.