(1) The CMA may require an undertaking to pay it a levy in respect of a chargeable year during the whole or part of which the undertaking is a designated undertaking.
(2) The amount of the levy is to be calculated in accordance with rules made for the purposes of this section by the CMA ("the levy rules").
(3) The CMA may amend or replace the levy rules.
(4) The levy rules must -
(a) secure that the aggregate amount payable in respect of a chargeable year is not to exceed the costs which the CMA incurs in exercising its digital markets functions during that year;
(b) make provision about how the aggregate amount payable in respect of a chargeable year is to be divided between the undertakings which are designated undertakings for the whole or part of that year;
(c) secure that where an undertaking is a designated undertaking for only part of a chargeable year, the amount of the levy payable by that undertaking in respect of that chargeable year is proportionately reduced;
(d) set out h
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