S.5: Scope of total income – Income chargeable to tax- Double taxation – Where the assessee has paid the income- tax at source in the State of Sikkim as per the law applicable at the relevant time in Sikkim, the same income was not taxable under the IT Act, 1961-.In a case of reasonable doubt, the construction most beneficial to the taxpayer is to be adopted [ S.4 ,80TT,256(1), Sikkim State Income Tax Rules, 1948, Art. 371F ]
Mahaveer Kumar Jain v. CIT (2018) 404 ITR 738/ 165 DTR 113/ 302 CTR 1/ 255 Taxman 161 (SC) , www.itatonline.org