Section 166 - Reference to Transfer Pricing Officer
A TPO proceeding is evidence-driven. The officer determines the arm's length price, while the Assessing Officer computes total income in conformity with that determination.
Reviewed by CA Nikhil Gupta · Updated 9 October 2026
Current law and effective date
Section 166 is controlled against the consolidated Income-tax Act, 2025 as amended by the Finance Act, 2026. The Act and Income-tax Rules, 2026 operate from 1 April 2026; earlier years and saved proceedings require the repeal-and-savings framework rather than automatic migration.
Primary statute: Income Tax Department consolidated Act | Rules: Notified Income-tax Rules, 2026
Finance Act 2026 amendment source: Official Notes on Clauses / amendment materials
2-minute decode
A TPO proceeding is evidence-driven. The officer determines the arm's length price, while the Assessing Officer computes total income in conformity with that determination.
Who should use this section
Assessing Officers, Transfer Pricing Officers and taxpayers dealing with a TP reference, unreported covered transactions or a valid multi-year option.
Old-law bridge
section 92CA
The old-law bridge is navigational, not automatic precedent transfer. Match the 1961 Act wording, saved proceedings, current 2025 Act text and effective date before importing an older interpretation.
Finance Act 2026 / current-law note
Finance Act, 2026 substituted the TPO-order limitation rule. The current deadline is tied to one month before the month in which the assessment limitation expires, with special 31 March and 31 December end-date mechanics reflected in the operative text.
Professional alert
Application caution The multiple-year option is procedural, transaction-specific and unavailable for proceedings under Chapter XVI-B.
Connected Income-tax Rules, 2026 and Forms
| Rule | Current control | Form |
|---|---|---|
| Rule 77-82 | TPO reference / arm's-length mechanics and multi-year option support | 46, 47 where applicable |
Worked application
A taxpayer reports software services but omits a group guarantee. If the guarantee comes to the TPO's notice, it can be treated as referred without a separate original reference.
Evidence / compliance checklist
- Form 46 option (section 166 evidence control 1).
- transaction similarity analysis (section 166 evidence control 2).
- TPO notices and replies (section 166 evidence control 3).
- complete accountant report reconciliation (section 166 evidence control 4).
Common mistake
A common section 166 error is to apply the old-law label or headline rate without rebuilding the current statutory conditions. For “Reference to Transfer Pricing Officer”, the safer control is to test the exact taxpayer/transaction facts, the operative tax year, every linked Rule/Form and the Finance Act 2026 consolidated wording. Application caution The multiple-year option is procedural, transaction-specific and unavailable for proceedings under Chapter XVI-B.
Recommended approach
For section 166, start with the legal trigger in “Reference to Transfer Pricing Officer”, document the evidence for that trigger, then run the computation or procedural step against the current text. As a cross-check, verify this provision-specific checkpoint: A valid multi-year option can extend a qualifying arm's-length determination to the next two consecutive tax years, subject to prescribed conditions.
Thresholds, periods and timing checkpoints
- A valid multi-year option can extend a qualifying arm's-length determination to the next two consecutive tax years, subject to prescribed conditions.
- Finance Act 2026 changed the TPO-order time-limit machinery; calculate it from the current assessment limitation rather than the repealed sixty-day formulation.
Related provisions and interaction map
Section 166 forms part of the sections 161-173 transfer-pricing code; apply Rules 77-124 only as relevant and cross-check sections 263, 286/296 plus treaty / PE provisions for this section.
Provision summary - verify verbatim text in the official Act
Text-status note: This guide does not reproduce the complete verbatim provision for section 166. Use the linked official consolidated Act before quoting sub-section language or preparing a filing, opinion or litigation document.
Primary-source trail
Statute: Income-tax Act, 2025 as amended by Finance Act, 2026
Rules: Income-tax Rules, 2026
Law navigation: Income Tax Department 2025 Act / Rules hub
Quoting note: Use the official consolidated Act for verbatim legislative language.
FAQs
Does an old Income-tax Act, 1961 case automatically decide section 166?
No. The old-law bridge helps research, but transferability depends on materially matching language, transition rules and any Finance Act 2026 change.
Which text should be quoted in advice or litigation?
Quote the consolidated official statute for the relevant tax year. If this page presents a provision summary rather than complete statutory text, use the official consolidated Act for verbatim legislative language.