Mastering Form 91: The Legal Shield for Assessee Data Under Section 258(2)(a) of the Income Tax Act 2025

The modern taxation landscape is heavily reliant on the seamless flow of financial data. However, the revenue department is also the ultimate custodian of highly sensitive information pertaining to every registered assessee. Striking a delicate balance between inter-agency cooperation and the fundamental right to financial privacy is a cornerstone of the Income Tax Act 2025.

When various government bodies or authorized public agencies request access to the financial records of an assessee, the tax department does not automatically comply. If sharing such sensitive intelligence contravenes the broader public good, the designated tax authorities possess the statutory power to decline the request. This formal rejection is executed through a specific legal instrument known as Form 91.

This comprehensive guide explores the legislative framework, procedural nuances, and digital transformations surrounding Form 91, providing an in-depth understanding of how the tax department safeguards assessee data.

The Legislative Evolution: From 1961 to 2025

To fully grasp the significance of Form 91, one must look at the legislative transition from the legacy tax regime to the overhauled statutory framework of 2025.

Under the erstwhile Income Tax Act 1961, the refusal to share an assessee's details with other agencies was governed by Section 138(1)(b), read alongside Rule 113 of the Income Tax Rules 1962. The formal document used for this purpose was previously known as Form 49.

With the enactment of the Income Tax Act 2025, the legal provisions underwent a significant realignment to promote transparency, digital accountability, and precise terminology. The power to refuse information disclosure is now firmly entrenched in Section 258(2)(a) of the Income Tax Act 2025. Correspondingly, the procedural guidelines are dictated by Rule 155 of the Income Tax Rules 2026. Under this new digital-first regime, the legacy Form 49 has been officially replaced by Form 91 (also designated as Form 091 or FN 091 within the departmental systems).

Important Note: The transition to the 2025 Act is not merely a change in numbering. It represents a qualitative shift towards electronic traceability, eliminating manual discretion and ensuring that every refusal is backed by a verifiable Document Identification Number (DIN).

The Ecosystem of Information Sharing Forms

The issuance of Form 91 does not happen in isolation. It is part of a broader, event-driven ecosystem of statutory forms designed to handle inter-agency data requests. Understanding this matrix is crucial for comprehending the lifecycle of an information request regarding an assessee.