Retrospective amendments and Article 14 challenges in GST
Parliament may validate. Whether it may undo a judgment in your favour is a different question.
A retrospective amendment to a taxing statute is permissible in principle, including a validating amendment that changes the basis on which a decision was rendered. It is not permissible for the legislature simply to declare a judicial decision to be wrong and thereby set it aside. A retrospective levy must also survive Article 14 scrutiny, and courts examine whether it is arbitrary, whether it defeats settled expectations, and whether it imposes an impossible burden. The live example in GST is the 2025 substitution in Section 17(5)(d) following Safari Retreats.
The permissible and the impermissible
Permissible: an amendment that changes the law with retrospective effect, including one that removes the basis of an earlier decision, provided the legislature has the competence and the amendment is not otherwise unconstitutional.
Impermissible: a legislative declaration that a particular judgment is set aside or is not binding, without changing the law on which it rested.
The distinction is between altering the legal foundation and overruling the court. The first is legislative; the second is judicial and beyond the legislature.
A retrospective amendment must also satisfy Article 14, and an amendment that operates arbitrarily, or that imposes a liability which could not have been anticipated or provided for, is open to challenge.
The Section 17(5)(d) example
The Supreme Court in Safari Retreats held that plant or machinery in clause (d) was distinct from the defined plant and machinery and that a building could be a plant on a functionality test.
The Finance Act, 2025 substituted plant and machinery in clause (d) with effect from 1 July 2017 and barred refund of credit already reversed.
The challenge is that taxpayers arranged their affairs, filed their returns and in some cases obtained judgments on the law as it stood, and that a retrospective substitution which nullifies that outcome offends Article 14 and, where a judgment has been rendered, trespasses on the judicial function.
The counter argument is that Parliament merely clarified the expression it had always intended, and that a validating amendment of a fiscal provision is well within competence.
For any taxpayer with an open period, the ground must be preserved in the reply and in the appeal, because the outcome will not be available to those who did not plead it.
How to plead it
Set out what the law was, what the taxpayer did in reliance on it, and what the amendment now requires.
Where a judgment or an order was obtained, plead it specifically and plead the trespass on the judicial function.
Plead Article 14 with particulars: the arbitrariness, the impossibility of compliance for a closed period, and the discrimination between similarly placed taxpayers.
Plead the bar on refund separately, because a provision barring refund of amounts already reversed raises its own questions.
Preserve the ground even where the immediate demand is small, because it is the kind of question decided in a batch.
Authorities relied on
Interpreted plant or machinery in Section 17(5)(d) as distinct from the defined expression; the provision was subsequently substituted retrospectively.
The legislature may validate a law retrospectively by removing the basis of a judgment, but cannot simply declare a judgment ineffective without altering the law.
Legislative competence and the limits of delegation determine validity, not the Council's recommendation.
What to do on Monday
Preserve the retrospectivity ground in every open reply and appeal, whatever the amount.
Document what you did in reliance on the earlier law, with dates.
Plead the bar on refund as a separate ground.
Seek interim protection and tagging where a batch is pending.
This page states the general position. A reader with a specific question on their own facts may write to the GST practice at AMLEGALS.
Write to the GST practiceQuestions we are asked on this
Can a retrospective amendment take away credit we already used?
It can change the law retrospectively; whether it can do so in a manner that nullifies a concluded proceeding in your favour is the live question.
Does the bar on refund of reversed credit stand?
It is part of the amendment and is itself open to challenge. Plead it separately.
Should we preserve the ground even for a small demand?
Yes. These questions are decided in batches and only those who pleaded the ground benefit.
Is a validating amendment always valid?
No. It must be within competence and must satisfy Article 14.
What is the practical relief while it is pending?
Interim protection, and preservation of the ground in every open proceeding.
In this cluster
- Writ jurisdiction in GST: when the High Court will hear you
- Alternative remedy and the exceptions the courts have carved
- Challenging a notification, rule or circular as ultra vires
- Violation of natural justice as a ground for writ relief
- Jurisdictional error versus error within jurisdiction
- Interim protection: stay, no coercive steps and conditional orders
- The constitutional challenges to ITC conditions: what has been decided, and what is still open
- Are GST Council recommendations binding? What Mohit Minerals settled, and how to use it
- Recovery during the pendency of proceedings: the limits of Sections 78 and 79
GST Insights is published by AMLEGALS for general information. Law stated as on 3 September 2026. Not advice on any particular set of facts; not an advertisement or a solicitation under Rule 36 of the Bar Council of India Rules. Readers with a question on their own facts may write to the GST practice of their own accord.