Section 133(6) of the Income-tax Act, 1961 empowers income tax authorities to call for information from any person, including banks, to facilitate the assessment of income. This provision is significant as it allows tax authorities to gather necessary data that may not be directly available through the taxpayer. The section is often invoked during investigations or assessments to verify the accuracy of the taxpayer's claims. The statutory test under this section requires that the information sought must be relevant to any proceedings under the Act. The burden of proof lies with the tax authorities to justify the necessity of the information requested. In practice, this section is crucial for ensuring compliance and detecting tax evasion, as it enables authorities to cross-verify financial transactions and other relevant details.