Did we file too early?
Did we file our payroll end of year info (P35 and P14s) too early?
Our last payroll run was around 18th March and we completed the year end on 21st March. This included online filing - and we got an acknowledgement from HMRC that all was successful.
Now received a reminder dated 29th April that we must file by19th May, or penalties will start.
(Of course, we can't speak to HMRC today - there are staff on strike. And the phones will be busy tomorrow from today's backlog).
What really annoys is the time wasted on things like this, which includes the difficulty in being able to communictae with HMRC.