Income: Employment income rules - Specific payments and benefits in kind excluded from employment income for tax credit purposes: Child Care Vouchers
The Tax Credits (Definition and Calculation of Income) Regulations 2002, Reg. 4(4), Table 1 (Item 15).
A cash voucher, non-cash voucher or credit-token to the extent that it is used by the recipient to obtain relevant childcare.
Relevant child care, is care that had they paid for it (instead of using the voucher(s) or token), they would have been incurring relevant child care charges for the purposes of the childcare element of WTC: the child care element is only available for costs incurred by the claimant(s).