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Income-tax Rules, 2026 · Appendix III

Form 166: Statement of reportable accounts under section 508(1)

Source checked 21 October 2026 · Original author: Finin2min Editorial Desk

Purpose, person and period

Statement of reportable accounts under section 508(1).

The reporting financial institution furnishes Form 166 after the applicable account due diligence, including controlling-person details for an entity account where required; reporting period and currency must follow the connected rules.

Period gate: This numbered form belongs to the Income-tax Rules, 2026, effective 1 April 2026. The predecessor 61B is a concordance, not permission to change an earlier-year filing into a new-law form. For earlier periods, use the applicable 1961 Act form and saved procedure.

Official transition guidance

Controlling rule and source pages

Rule 239; Section 508(1). Physical PDF pp 881-885; printed Gazette pp 2413-2417.

Rule 239 — connected rule text

239. Information to be maintained and reported.— (1) The following information shall be maintained and reported by a reporting financial institution in respect of each reportable account: — (a) the name, address, taxpayer identificati on number (assigned to the account holder by the country or territory of his residence for tax purposes) and date and place of birth (in the case of an individual) of each reportable person, that is an account holder of the account but that in the case of an account other than a U.S. reportable account, a reporting financial institution shall also, – I. maintain and report whether the account holder has provided a valid self -certification; II. report whether the account is a joint account, including the numb er of joint account holders; (b) in the case of any entity which is an account holder and which, after application of due diligence procedures as provided in rule 240, is identified as having one or more controlling persons that is a reportable person, – (i) the name and address of the entity, taxpayer identification number assigned to the entity by the country or territory of its residence; and (ii) the name, address, date and place of birth of each such controlling person and taxpayer identification number assigned to such controlling person by the country or territory of his residence. but that in the case of an account other than a U.S. reportable account, a reporting financial institution shall also, – (I) maintain and report the role(s) by virtue of wh ich each reportable person is a controlling person of the entity and whether a valid self -certification has been provided for each reportable person; (II) report whether the account is a joint account, including the number of joint account holders; (c) the account number (or functional equivalent in the absence of an account number), but that in the case of an account other than a U.S. reportable account, a reporting financial institution shall also maintain and report the type of account and whether the a ccount is a pre -existing account or a new account; (d) the account balance or value (including, in the case of a cash value insurance contract or annuity contract, the cash value or surrender value) at the end of relevant calendar year or, if the account was closed during such year, immediately before closure; (e) in the case of any custodial account, - (i) the total gross amount of interest, the total gross amount of dividends, and the total gross amount of other income generated with respect to the assets held in the account, in each case paid or credited to the account (or with respect to the account) during the calendar year; and (ii) the total gross proceeds from the sale or redemption of financial assets paid or credited to or with respect to the accou nt during the calendar year with respect to which the reporting financial institution acted as a custodian, broker, nominee, or otherwise as an agent for the account holder; (f) in the case of any depository account, the total gross amount of interest paid or credited to the account during the relevant calendar year; (g) in the case of any account other than that referred to in clause (e) or (f), the total gross amount paid or credited to the account holder with respect to the account during the relevant ca lendar year with [PDF PAGE 202] 1734 THE GAZETTE OF INDIA : EXTRAORDINARY [PART II—SEC. 3(i)] respect to which the reporting financial institution is the obligor or debtor, including the aggregate amount of any redemption payments made to the account holder during the relevant calendar year; (h) in the case of any account held by a non -participating financial institution, for calendar years 2015 and 2016, the name of each non -participating financial institution to which payments have been made and the aggregate amount of such payments; but the information to be reported, – (i) with respect to calendar year 2014, is the information referred to in clauses (a), (b), (c) and (d), with regard to U.S. reportable accounts; (ii) with respect to calendar year 2015, is the information referred to in clauses (a), (b), (c), (d), (f), (g), (h) and sub-clause (i) of clause (e), with regard to U.S. reportable accounts; (iii) with respect to calendar year 2016, is the information referred to in clauses (a) to (h), with regard to all reportable accounts; (iv) with respect to calendar year 2017 and subsequent years, is the information referred to in clauses (a) to (g), with regard to all reportable accounts; (v) with respect to each U.S. reportable account which is maintained by a reporting financial institution as o n the 30th June, 2014, the taxpayer identification number of any relevant person is not required to be reported if such taxpayer identification number is not in the records of the reporting financial institution. (i) in the case of an account other than U .S. reportable account, where any equity interest is held in an investment entity that is a legal arrangement, the roles by virtue of which the reportable person is an equity interest holder. (2) For the purposes of sub-rule (1),- (a) "account holder" mea ns the person listed or identified as the holder of a financial account by the financial institution that maintains the account: Provided that a person, other than a financial institution, holding a financial account for the benefit or on acco unt of another person as agent, custodian, nominee, signatory, investment advisor, or intermediary, is not treated as holding the account, and such other person is treated as holding the account: Provided further that in the case of a cash value insurance contract or an annuity contract, the account holder is any person entitled to receive a payment upon the maturity of the contract or any person entitled to access the cash value or change the beneficiary of the contract and if no person can access the cash value or change the beneficiary, the account holder is any person named as the owner in the contract and any person with a vested entitlement to payment under the terms of the contract; (b) "taxpayer identification number" means a number assigned to a per son in the country or territory in which he is resident for tax purposes and includes a functional equivalent in case no such number is assigned. (3) Where the person is a resident of more than one country or territory outside India under the tax laws of s uch country or territory, the reporting financial institution shall maintain the taxpayer identification number in respect of each such country or territory. (4) Irrespective of sub -rule (1), with respect to each reportable account which is a pre -existing account, the taxpayer identification number or date of birth is not required to be reported if such taxpayer identification number or date of birth is not in the records of the reporting financial institution but the reporting financial institution shall obtain the taxpayer identification number and date of birth with respect to, – (a) pre-existing accounts by the 31st December, 2016 and shall report it with respect to calendar year 2017 and subsequent years; and (b) an account other than a U.S. reporta ble account, whenever it is required to update the information relating to the pre -existing account pursuant to the rules made under The Prevention of Money - Laundering Act, 2002. (5) Irrespective of sub-rule (1) and sub-rule (4), the taxpayer identification number is not required to be reported if,- (i) a taxpayer identification number (including its functional equivalent) is not issued by the relevant country or territory outside India in which the person is resident for tax purposes or; (ii) the domestic law of the relevant country or territory outside India does not require the collection of the taxpayer identification number issued by such country or territory. (6) Irrespective of sub -rule (1), the place of birth is not required to be reported unless it is available in the electronically searchable data maintained by the reporting financial institution. [PDF PAGE 203] [भाग II—खण्‍ ड 3(i)] भारत‍का‍राजपत्र‍:‍असाधारण 1735 (7) Irrespective of sub -rule (1)(e)(ii) and unless the reporting financial institution elects otherwise with respect to any clearly identified group of accounts, the gross proceeds from the sale or redemption of a financial asset are not required to be reported to the extent such gross proceeds from the sale or redemption of such financial asset are reported by the reporting financial institution under th e Crypto -Asset Reporting Framework but the provisions of this sub -rule shall apply in respect of an account other than U.S. reportable account. (8) The statement of reportable account required to be furnished under section 508(1)(k) shall be furnished by a reporting financial institution in respect of each account which has been identified, pursuant to due diligence procedure specified in rule 240, as a reportable account but where pursuant to such due diligence procedures no account is identified as a rep ortable account, a nil statement shall be furnished by the reporting financial institution. (9) The statement referred to in sub -rule (8) shall be furnished in Form No. 166 and in such manner, as may be specified by the Principal Director General of Incom e Tax (Systems) or the Director General of Income Tax (Systems), as the case may be, with the approval of the Board for every calendar year by the 31st day of May following that year; (10) (a) The statement referred to in sub -rule (8) shall be furnished to the Director of Income -tax (Intelligence and Criminal Investigation) or the Joint Director of Income -tax (Intelligence and Criminal Investigation) through online transmission of electronic data to a server designated for this purpose under the digital signature in accordance with the data structure specified in this regard by the Principal Director General of Income-tax (Systems). Explanation. — For the purposes of this sub -rule, "digital signature" means a digital signature issued by any Certifying Authority authorised to issue such certificates by the Controller of Certifying Authorities. (b) Principal Director General of Income Tax (Systems) shall specify the procedures, data structures and standards for ensuring secure capture and transmission of data , evolving and implementing appropriate security, archival and retrieval policies. (11) (a) Every reporting financial institution shall communicate to the Principal Director General of Income -tax (Systems) the name, designation and communication details of the Designated Director and the Principal Officer and obtain a registration number; (b) The statement referred to in sub -rule (8) shall be signed, verified and furnished by the Designated Director of the reporting financial institution on the basis of information available with the institution: Provided that where the reporting financial institution is a non -resident, the statement may be signed, verified and furnished by a person who holds a valid power of attorney from such Designated Director; (c) It shall be the duty of every reporting financial institution, its Designated Director, Principal Officer and employees to observe the procedure and the manner of maintaining information as specified by its regulator. Explanation. - For the purposes of this sub-rule, - (a) "Designated Director" means a person designated by the reporting financial institution to ensure overall compliance with the obligations imposed under section 508 and the rules made thereunder and includes— (i) the Managing Director or a whole -time Director, as defined in the Companies Act, 2013 (18 of 2013), duly authorised by the Board of Directors if the reporting financial institution is a company; (ii) the managing partner if the reporting financial institution is a partnership firm; (iii) the proprietor if the reporting financial institution is a proprietorship concern; (iv) the managing trustee if the reporting financial institution is a trust; (v) a person or individual, a s the case may be, who controls and manages the affairs of the reporting financial institution if the reporting financial institution is an association of persons or a body of individuals, or any other person; (b) "Principal Officer" means an officer designated by the reporting financial institution; (c) "regulator" means a person or an authority or a Government which is vested with the power to licence, authorise, register, regulate or supervise the activities of the reporting financial institution. (12)(a) The regulator referred to in sub-rule (11)(c) shall issue instructions or guidelines to, – (i) incorporate the requirements of reporting and due diligence procedure specified under rules 238 to 240; [PDF PAGE 204] 1736 THE GAZETTE OF INDIA : EXTRAORDINARY [PART II—SEC. 3(i)] (ii) provide the procedure and manner of maintaini ng the information by the reporting financial institution; and (iii) ensure the availability of the information referred to in sub -rule (1) with the reporting financial institution for meeting its reporting obligation, if such information is not maintained by it under any rule or regulation issued by the regulator. (b) Every reporting financial institution shall maintain information in respect of financial accounts in accordance with the procedure and manner as may be specified by its regulator from t ime to time so as to enable reporting of information prescribed under this rule and perform due diligence procedure specified under rule

Completed field illustration

Fictional data, not for filing. A fictional reporting financial institution illustrates one UK-resident individual’s reportable account after assumed due diligence.

Form field / blockCompleted fictional entry
Part A: institution / ITDREIN / GIIN / categoryExample Reporting Bank Ltd / MODEL-ITDREIN-166 / MODEL-GIIN if applicable, not a genuine registration / reporting financial institution assumed
Statement / period / report count / officerOriginal descriptive model, utility codes to be confirmed / calendar year ending 31 December 2026 / one report / Priya Arun Sharma, principal officer
B.1-B.2: account / holder / status / currency / branchMODEL-ACCOUNT-166 / Alex Morgan Example / open, single holder / GBP / Pune Model Branch, 10 Model Bank Road Pune
B.3: closing balance / gross interest / dividend / proceeds / otherGBP 20,000 / GBP 500 / nil / nil / nil; maintained currency retained
B.4: individual / residence / TIN / birth / addressAlex Morgan Example / UK tax resident, assumed self-certification and due diligence / MODEL-UK-TIN-166, UK / 1 June 1985, London UK / 10 Example Street London
Entity / controlling-person branchesNot applicable to this individual-holder example
April corrigendum / verificationOmit Aadhaar cells as directed by Notification 64/2026; NOT SIGNED or uploaded

This illustrates the named fields, not every possible schedule. Use the complete official extract for additional applicable fields, annexures and verification. “Not signed” means no professional certification or authority action has occurred.

Reconcile the example

Reportable jurisdiction, account classification, exclusions, indicia, valid self-certification and due diligence under the governing rules determine reportability. This model does not certify the bank’s FATCA/CRS registration or convert a reporting balance into taxable income.

Prepare, furnish and retain

  1. Use the form identity and period above, then determine the person who prepares, issues or verifies it from Rule 239. An authority-issued order is not an applicant filing.
  2. Collect the records that support the actual fields in the example; keep any mandatory schedules and annexures specified in the complete source form.
  3. Reconcile dates, amounts, units and identifiers to the underlying records. Preserve the applicable rule version and any later correcting notification.
  4. Where the rule prescribes electronic furnishing, use the current official utility/schema and authorised verification. A local PDF does not produce a portal acknowledgement.
  5. Retain the submitted version, supporting schedules and actual acknowledgement or issued certificate/order, as applicable. This fictional model supplies none of those evidential outcomes.

Download the correct documents

Official Form 166 source extract Filled sample — fictional field illustration

The official extract preserves source pages; later amendments are supplied with affected forms. Read the April corrigendum where its printed-page corrections apply. The filled field illustration is an educational model and cannot be filed.

Primary sources

Questions readers ask

Does this sample prove approval, filing or a professional conclusion?

No. It completes the named fields using synthetic facts. It has no real signature, DSC, approval or acknowledgement.

Can I use the legacy form number for a current tax-year obligation?

Establish the governing period first. A predecessor number is a cross-reference; earlier-year procedures and current-year forms must be kept distinct.