BIM40660 | Specific receipts: insurance and other commission: sums to which trader is entitled
From HM Revenue & Customs · Business Income Manual
Statement of Practice SP4/97 paragraph 14 (see BIM40655) explains that a trader becomes entitled to commission and a taxable trading receipt will arise, where commission or a cash-back is:
received,
netted off (meaning that the trader’s entitlement to commission or a cash back is set off against the obligation to pay the full purchase price for goods or services so that only the net amount is paid), or
invested or applied in some way for the benefit of the trader.
Where there is no entitlement to commission or a cash back, a taxable trading receipt will not arise even if:
the trader pays a discounted purchase price,
or
extra value is added to the goods, investments or services obtained by the trader for the purchase price.