The Government Says

Withholding of Income Tax for rewards received under the Strengthened Reward Scheme

Withholding of Income Tax for rewards received under the Strengthened Reward Scheme
Local copy of L-day_-_Informant_rewards_.pdf
Local copy of L-Day_2026_EN_-_Informants_Rewards.odt

https://www.gov.uk/government/publications/withholding-of-income-tax-for-rewards-received-under-the-strengthened-reward-scheme

seen at 14:31, 13 July in Policy papers and consultations.