<h1>Public interest refusal to furnish information under income-tax law now uses electronic Form 91 with DIN authentication.</h1> Form 91 is the statutory electronic form used by the designated Income-tax authority to refuse furnishing information requested under section 258(2)(a) of the Income-tax Act, 2025 where disclosure is not considered to be in the public interest. It is issued only by the competent authority, records the application reference, assessee details and relevant tax year, and states the refusal on public interest grounds. The form is authenticated through a system-generated DIN and electronic issuance details, creating a formal and traceable record distinct from forms used for furnishing information or intimation of non-availability.