The NES apply to all national system employees (except in some cases casuals) at all times, whether as a direct entitlement or as a minimum standard underpinning entitlements under a modern award, enterprise agreement or contract of employment.
The NES cannot be displaced, even by the terms of a contract of employment, modern award or enterprise agreement. For example, employers cannot contract out of their obligation to provide personal or carer's leave in accordance with the NES. However, this does not prevent an employer and employee from agreeing to, or a modern award or enterprise agreement providing for, a more generous entitlement.