Re-enrolment is separate from the regular assessment of employees you do in each pay period. It’s specifically targeted at employees who have left their workplace pension.
You need to choose a date three years from the date your workplace pension started. Your re-enrolment date must be within a six-month ‘window’ starting three months before, and ending three months after, the three-year anniversary of your pension’s start date
You can only choose one date, even if you had different start dates for different groups of employees. It’s important to note, you can’t use postponement with re-enrolment.
Here are some examples.