In my opinion, there is no way for a registered person to avail input credit through Annual return. The following provisions make it very clear. No IPT can be claimed otherwise than through 3B returns on a self assessment basis subject to other terms and conditions.
Section 16. Eligibility and conditions for taking input tax credit.
(1) Every registered person shall, subject to such conditions and restrictions as may be prescribed and in the manner specified in section 49, be entitled to take credit of input tax charged on any supply of goods or services or both to him which are used or intended to be used in the course or furtherance of his business and the said amount shall be credited to the electronic credit ledger of such person.
Section 49. Payment of tax, interest, penalty and other amounts.-
(2) The input tax credit as self-assessed in the return of a registered person shall be credited to his electronic credit ledger, in accordance with [section 41 2[***]], to be maintained in such manner as may be prescribed
Section 41. [Availment of input tax credit
(1) Every registered person shall, subject to such conditions and restrictions as may be prescribed, be entitled to avail the credit of eligible input tax, as self-assessed, in his return and such amount shall be credited to his electronic credit ledger.
Section 59. Self-assessment. –
Every registered person shall self-assess the taxes payable under this Act and furnish a return for each tax period as specified under section 39.
Section 39. Furnishing of returns.-
(1) Every registered person, other than an Input Service Distributor or a non-resident taxable person or a person paying tax under the provisions of section 10 or section 51 or section 52 shall, for every calendar month or part thereof, furnish, a return, electronically, of inward and outward supplies of goods or services or both, input tax credit availed, tax payable, tax paid and such other particulars, in such form and manner, and within such time, as may be prescribed: