This briefing note explores the incentives for firms to comply with the National Living Wage/National Minimum Wage (NLW/NMW). It documents the penalties that firms are subject to; estimates underpaying firms’ rate of detection; and shows that even if detection rates were significantly increased, they would need to go hand-in-hand with higher financial penalties to provide firms with a hard economic incentive to comply with the NLW/NMW.