Sent from our partners at the IRS:
Here is important information regarding notices for Failure to Deposit penalties which may have been sent in error.
Some monthly and daily deposits of payroll taxes are being treated as late in error.
Due to the observed holiday on April 15, 2016, (Washington DC Emancipation Day), deposits were not due until April 18, 2016. IRS recently identified a programming error causing deposits made after April 15, 2016, to be considered late, even though they were made timely by April 18, 2016. In some instances, taxpayers were assessed failure to deposit penalties as a result.
IRS is working to resolve the issue and correct the erroneous penalty assessments in the near future. No taxpayer action is required at this time. Those affected will receive correspondence when the issue is resolved. We apologize for any inconvenience this may cause.