How should the employer assess earnings for pensions auto-enrolment if the worker's assessment date is part way through their pay reference period?

If the assessment date falls part way through the pay reference period, for example in the case of a new recruit, the employer should assess the worker's earnings from that date to the end of the pay reference period. This could mean that a new recruit is not auto-enrolled until their next pay reference period as this will be the first time that the worker is assessed on their full earnings.