Under the current auto-enrolment thresholds, you must add employees to your workplace pension if they:
are between 22 years old and State Pension age
earn at least £10,000 per year
normally live in the UK
If employees earn less than £10,000 per year (but more than £6,240), you don’t need to automatically enrol them; however, they can ask to join the scheme, in which case you are obliged to add them.