Dear _____________,

Employee promptness is essential to serving our customers properly. Although we do make allowances for occasional, unforeseen issues that cause tardiness, consistent lateness cannot be tolerated. Employees who offend our tardiness policy will be disciplined accordingly.

Within the last [insert number] of days, you have been late for your scheduled shift [insert number] times. Unless this pattern is corrected immediately, we will be forced to implement disciplinary action, up to and including termination of your employment.

If there are extenuating circumstances at the root of this problem, then please discuss the situation with me. Otherwise, [company's name] is not willing to accept this type of attendance any longer. I am certain that this issue will be resolved immediately.

Sincerely,