1. Change your existing pension settings to reflect a salary sacrifice deduction by ticking the Pre Tax and Pre NI boxes

Or

2. Set up a new pension deduction and manually move each employee to the new scheme. This scheme should be set up as a salary sacrifice, ticking the Pre Tax and Pre NI boxes only.

Please note that in the "% calculated on option", you should select "Pre salary sacrifice contractual earnings"

You will need to sync your software to Nest in order to send this data via data transfer. Please speak directly with Iris should you need further guidance on this aspect.