11.1 Carryover of excess deductions.—Under sections 57(1) to 57(3) of the Act, except as provided in section 57(5), the general rule is that a taxable person must carry forward excess input tax deductions to three consecutive tax periods before the person is eligible to apply for a refund of any unused excess input tax deductions. For example, except as provided under this clause, if a taxable person has excess input tax deductions for March, the person must carry forward those excess input tax deductions to April. If the excess deductions are not fully used up against output tax in the April through June tax periods, the person may file a claim for a refund of the excess deductions remaining. The oldest carryover is used first. For example, if a taxable person has excess deductions for March and April, the excess deductions from March are used against the output tax in May before the excess deductions from April are used against the output tax in May. The Comptroller generally has one calendar month to pay the refund upon application; that is, the Comptroller has until the end of July to pay the refund. However, under section 57(4) of the Act, if the Comptroller orders an audit of the refund claim, then the Comptroller has until the end of 10 working days after the conclusion of the audit to pay the refund. The time provided for the payment of a refund of excess input tax deductions is subject to an overall limit. Under section 57(4) of the Act, the Comptroller is required to pay the refund only to the extent that the Comptroller is satisfied that the taxpayer is entitled to the amount of the refund claimed.