GST for chemicals, petrochemicals and fertilisers
Classification at eight digits, an inverted structure in fertilisers, and detention risk on every hazardous consignment.
Chemical sector exposure sits in eight digit classification where similar products attract different rates, the inverted duty structure in fertilisers and specified chemicals with refund confined to goods credit, process loss and yield differences under Section 35(6), hazardous goods movement and detention, job work at processing units, and credit on plant construction after the retrospective substitution in Section 17(5)(d).
Classification and rate
Chemicals are classified at the eight digit level and small differences in composition, purity or end use can change the heading. The technical file — specification, test report, manufacturing process and standards — is the case.
Fertilisers and specified agricultural chemicals have concessional rates that create an inverted structure, with refund confined to input goods credit after VKC Footsteps, so services credit is permanently stuck.
Industrial versus retail packing, and the effect of packing and labelling on classification and on the applicability of any retail sale price based mechanism.
By products and co products, which frequently attract a different rate from the main product and are the commonest classification omission in this sector.
Operations and movement
Process loss and yield variation, which produce stock differences that Section 35(6) treats as deemed supplies. A yield study per process, refreshed periodically, is the only durable answer.
Hazardous goods movement, where detention has a safety dimension and expedited release under Rule 141 for goods likely to depreciate should be invoked immediately.
Tank and bulk storage at third party terminals, which raises the declaration of premises question and the ownership of stock in a shared tank.
Job work at processing units, with Section 143 challans and the return period, and the treatment of process chemicals consumed at the job worker's premises.
Effluent treatment and environmental services, which are taxable inward supplies with their own credit position.
The controls
An eight digit classification file per product with the technical evidence and a dated position note.
A yield and process loss study per process, with historical data.
A declared premises review covering every terminal and third party tank.
A monthly inverted duty refund filing with a quantification of the stuck services credit for pricing.
What to do on Monday
Build an eight digit classification file per product with technical evidence and a dated note.
Commission a yield and process loss study per process and refresh it.
Review declared premises across all terminals and third party tanks.
File inverted duty refunds monthly and price the stuck services credit.
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
Why does classification matter so much here?
Because similar products sit in different headings at different rates, and the difference is decided by composition and use evidence.
Can we refund all accumulated credit?
Only credit on input goods in an inverted duty claim. Services credit is stuck unless the output is zero rated.
How do we defend a yield difference?
With a process yield study and historical data, not an explanation.
Do we need to declare a third party tank?
Where goods are stored and supplies are made from it, the premises declaration question arises. Review it.
Is credit available on plant construction?
On apparatus fixed to earth, yes. On civil structure, no, after the retrospective substitution.
In this cluster
- GST for manufacturing: the exposure map
- GST for pharmaceuticals and life sciences
- GST for automotive and auto components
- GST for textiles and apparel
- GST for IT, SaaS and software exports
- GST for logistics, warehousing and transport
- GST for banking, NBFC and financial services
- GST for insurance after the individual policy exemption
- GST for hospitality, hotels and travel
- GST for education and edtech
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.