8.
A. The restriction of ITC is provided in Section 17(5) which reads as below:
(c) works contract services when supplied for construction of an immovable property (other than plant and machinery) except where it is an input service for further supply of works contract service;
(d) goods or services or both received by a taxable person for construction of an immovable property (other than plant or machinery) on his own account including when such goods or services or both are used in the course or furtherance of business.
Explanation.––For the purposes of clauses (c) and (d), the expression “construction” includes re-construction, renovation, additions or alterations or repairs, to the extent of capitalisation, to the said immovable property;
A.1. There is no doubt as to the goods or service in consideration here is related to immovable property (i.e. commercial building) which is not a plant or machinery.
A.2. Therefore, the issue now is whether replacement of windows and doors and painting etc., would fall under the term 'construction', which is clarified in the explanation above as "repairs to the extent of capitalisation" is "construction".
B. Section 155 deals with burden of proof - Where any person claims that he is eligible for input tax credit under this Act, the burden of proving such claim shall lie on such person.
B.2. I did not find any specific requirement under section 35 read with rule 56 with regard to maintenance of a 'Fixed Asset Register' or similar account /record /book in which the capitalization is to be made.
B.4. However that being said, since the burden of proof is on the Registered Person to prove that ITC is eligible u/s 155, the Registered Person has to maintain such register to prove that said goods or service are not capitalized.