Dear …

RE: Late Reports – Not Acceptable

It has come to my attention that the __(Type of Reports)__ that you hand in are consistently late. Please allow me to remind you that these __(monthly/weekly/etc.)__ reports are due on or before the __(example: last day of the preceding month)__. Failure to hand them in on time causes undo __(briefly describe what problems/delays/challenges this causes)__.

Your performance in this area is not acceptable, __(Name)__, and I must make you aware that late reports from you will no longer be tolerated. It will be unpleasant if I have to remind you again and trust you will take whatever corrective measures necessary to resolve this issue. Thank you.

Yours truly,