Link: https://www.taxes.gov.az/az/page/ar-vergi-mecellesi; https://justice.gov.az/senedler/57?culture=en
Tax Code 63 and Law on administrative proceedings, Civil Procedure Code, (30 days and the duration of the administrative proceedings may be extended twice by 30 days each time.)
Article 63.(Tax Code) Examination of Complaints by the Tax Authority
63.1. Complaints from a taxpayer or another debtor regarding the decisions (acts) of the tax authority or the actions (inactions) of the officials of the tax authority shall be examined by the higher tax authority or its officials within 30 working days from the date the complaint is received, and a written response shall be provided to the complainant. If it is determined that more than 30 working days are required to establish significant circumstances regarding the complaint, the examination period may be extended once by the tax authority for an additional 30 working days. The complainant shall be informed about the extension of the deadline within 3 working days.