13.6 Post-supply notice requirement.— Schedule 1, paragraph 2(1)(i)(ii) requires the transferor and transferee to furnish the Comptroller a notice in writing within 21 calendar days after the supply takes place. Unless the transferor and transferee both are registered persons and both sign and file in a timely manner the post-supply notice expressing their intent to treat the transfer as a supply of a going concern under Schedule 1, paragraph 2(1)(i) of the Act, the transfer is not zero rated, even if in fact it is a transfer of a going concern. The 21 calendar day period within which the notice must be filed is determined under the time of supply rules in section 18 of the Act. If the transferee previously was not a registered person, the supply can qualify for zero rating only if the transferee is registered by the date the transfer takes place. If the parties satisfy the notice requirements in Schedule 1, paragraph 2(1)(i) and the transfer does not qualify as a zero rated supply of a going concern under section 4(2) of the Act, the consideration charged for the supply is treated as being exclusive of VAT, the transfer is subject to tax, the value of the supply for tax purposes is the consideration charged, and the transferee can claim an input tax deduction to the extent allowable under the Act. If under the agreement between the parties the selling price is increased to include VAT in the event of non-qualification of the transfer, then the value of the supply is determined on the basis of the adjusted selling price under the contract (reduced, under the general rules, by the amount of VAT).