Form 166 Income Tax Rules 2026 pdf download and Key points

Last Updated on: April 20, 2026

Form 166 Income Tax Rules 2026 pdf download and Key points

FORM NO. 166
[See rule 239]
Statement of Reportable Account under section 508(1)

he primary purpose of Form 166 is to provide a standardized certification by a Chartered Accountant regarding the determination of the Arm’s Length Price (ALP) or other specific international tax compliance requirements.

Legal Basis: It is prescribed under the provisions of Section 166 of the Income-tax Act, 2025.
Issuer: This form must be issued and signed by an “Accountant” (as defined in Section 515(3)(b), typically a practicing Chartered Accountant).
Context: It is often used in conjunction with Form 46 (the Exercise of option for determination of Arm’s Length Price).
Objective: To certify that the figures, computations, and methods used by the taxpayer to determine international transaction values or domestic specified transactions are accurate and comply with the new Act’s Transfer Pricing guidelines.

## Important Renumbering Context (2026 Regime)

Since you are looking at Form 166, it is helpful to note how other common forms have shifted in the 2026 Rules to avoid confusion during your practice:

Old Form (1962 Rules)	New Form (2026 Rules)	Purpose
Form 16	Form 130	Salary TDS Certificate
Form 16A	Form 131	Non-Salary TDS Certificate
Form 26AS	Form 168	Annual Tax Statement (AIS/TIS)
Forms 3CA/CB/CD	Form 26	Consolidated Tax Audit Report
Form 15G/15H	Form 121	Unified form for No-TDS declaration
Form 24Q	Form 138	Quarterly TDS Return (Salary)