As of Monday, June 11, 2018
WASHINGTON, D.C. Taxpayers who owe tax and file their federal income tax return more than 60 days after the deadline will usually face a higher late-filing penalty.
For that reason, the Internal Revenue Service urges affected taxpayers to avoid the penalty increase by filing their return by Thursday, June 14.
Ordinarily, the late-filing penalty, also known as the failure-to-file penalty, is assessed when a taxpayer fails to file a tax return or request an extension by the due date.
This penalty, which only applies if there is unpaid tax, is usually 5 percent for each month or part of a month that a tax return is late.
If a tax return is filed more than 60 days after the April due date, the minimum penalty is either $210 or 100 percent of the unpaid tax.