law: 30. Refund.
  (1) If any person satisfies the Commissioner that the amount of tax paid by him or on his behalf for any year exceeds the amount payable by him under this Act for that year, he shall, on making a claim in the prescribed form and verified in the prescribed manner, be entitled to refund of the excess either by cash payment or at his option by deduction of such excess from the amount of tax and penalty (if any) due in respect of any other period:
  Provided that the Commissioner shall first apply such excess towards the recovery of any amount in respect of which a notice under section 25 has been issued and shall then refund the balance, if any.
  Explanation.
  When no assessment is made, the due tax paid under section 21 by the dealer shall be deemed to be the tax payable under this Act.
  (2) Where on account of death, incapacity, insolvency, liquidation or other cause a person is unable to claim or receive any refund due to him, his legal representative or the trustee or guardian or receiver, as the case may be, shall be entitled to claim or receive such refund for the benefit of such person or his estate.
  (3) No claim for refund under sub-section (1) shall be allowed unless it is made within a period of twelve months from the date of the order giving rise to a claim for such refund, and the Commissioner shall, except as otherwise provided in this Act, refund any amount which becomes due to a dealer in the prescribed manner:
  Provided that the Commissioner may allow a claim for refund to be made after the expiry of the said period but not later than twelve months from such expiry, if he is satisfied that there was sufficient cause for not making such claim within that period.
  (4) Where an amount required to be refunded by the Commissioner to any person as a result of any order passed in appeal or other proceedings under this Act is not so refunded to him within ninety days from the date of his claim under sub-section (3), such person shall be entitled to be paid simple interest on such amount at one per cent. per month from the date immediately following the expiry of the period of ninety days for a period of one month and at one and a half per cent. per month, thereafter for so long as the refund is not made.
  Explanation.
  If the delay in making the refund during any of the periods referred to in thissub-section is attributable to the person making the claim, whether wholly or in part, the period of the delay attributable to him shall be excluded from the period for which interest is payable.
  (5) Where any question arises as to the period to be excluded for the purposes of calculation of interest under sub-section (4), such question shall be determined by the Commissioner whose decision thereon shall be final.
  (6) Where an order giving rise to a refund is the subject matter of an appeal or further proceeding or where any other proceeding under this Act is pending and the Commissioner is of opinion that the grant of the refund is likely to adversely affect the revenue, the Commissioner may withhold the refund till such time as the Commissioner may determine.
  (7) In any claim for refund, it shall not be open to the dealer to question the correctness of any assessment or other matter decided which has become final and conclusive or ask for a review of the same and the dealer shall not be entitled to any relief on such claim except refund of tax wrongly paid or paid in excess.
  (8) Any tax levied and collected under this Act in respect of sale in Delhi of any declared goods which are subsequently sold in the course of inter-State trade or commerce, shall be reimbursed to the person making the sale on the course of inter-State trade or commerce, in such manner and subject to such conditions as may be prescribed.
  Explanation.
  For the purposes of sub-section (8), "declared goods" means goods declared by section 14 of the Central Sales Tax Act, 1956 (74 of 1956) to be of special importance in inter-Statetrade or commerce.