Where goods are supplied on sale or return, the tax point is the earliest of

(a) the date when the purchaser chooses to keep the goods;

(b) the issue of a tax invoice by the seller;

(c) the receipt of payment by the seller, other than a deposit;

(d) the expiry of the period within which the customer may return the goods; or

(e) twelve months after the date of dispatch by the seller.