Hi,
National Minimum Wage (NMW) does not recognise a difference between gross pay and net pay, and any deduction from pay, outside of a very specific list of exceptions, is likely to reduce a worker’s pay for NMW purposes.
A salary sacrifice scheme will always reduce a worker's pay as the worker is in essence giving up a portion of their pay in exchange for something else, so it cannot be included in any minimum wage calculations. Any determination would depend on the full arrangements in place.
For more information, please refer to:
Salary sacrifice
Alternatively, please consider seeking independent advice, such as, by contacting the Advisory, Conciliation and Arbitration Service (ACAS), or an independent legal advisor.
Thank you.