The basis of valuation is set out at EIM11205. The party responsible for valuation differs according to the circumstances of the arrangement.
Where a taxed award scheme (TAS) is entered into, the Incentive
Award Unit will agree the amounts chargeable to tax. See
EIM11235 for guidance on taxed award
schemes.
Where a PAYE settlement agreement (PSA) is entered into, the
employer's tax office will agree with the employer the amounts
chargeable to tax. See
EIM11270 for guidance on PSAs.
Where a direct employer enters details of non-cash awards not
dealt with by a TAS or a PSA on forms P9D or forms P11D, the
employer has to value the awards; the valuations may be checked
later in any normal compliance reviews.
A third party providing awards not covered by a TAS will have to
value awards on any return made under Section 15 TMA 1970 (see
EIM11215 about such returns). And a
third party providing awards not covered by a TAS will have to
value the awards when providing the employees with written details.
See Chapter 4 of “Self Assessment What it will mean for
employers” (SAT3 (1995)) about the obligation of third
parties to automatically provide such information to employees.