GST Ruling on Transformer Repair: Job Work or Composite Supply?
The West Bengal Authority for Advance Ruling decided that repairing transformers with parts replacement is a composite service, not job work.
- Ruling
- 47/WBAAR/2018-19 dated 26/03/2019
- Authority
- Authority for Advance Ruling
This page was written by Patron Accounting’s AI from the official release and reviewed before publishing. It explains the document in plain language. It is not the document itself. Where this page and the original differ, the original governs.
The short version
- Transformer repair is a composite supply, not job work.
- The service of repair is the principal supply.
- The authority declined to rule on using challans instead of invoices.
In short
The company asked if repairing transformers for a state utility counts as 'job work' under the Goods and Services Tax (GST) law. They wanted to know if they could treat the activity as a service and use delivery challans instead of tax invoices. The authority looked at whether the repair process, which includes replacing parts, fits the legal definition of job work.
What has changed
How it worked before
Many businesses assumed that any repair work involving the processing of goods owned by another party qualified as job work, allowing for simpler documentation.
What has changed
The authority ruled that because the repair involves replacing parts and transferring property in goods, it is a composite supply of services. This means the repair service is the main activity, and the parts are secondary. Practically, this confirms that such contracts should be taxed based on the service component rather than the job work rules.
Who this affects
Businesses that repair or maintain heavy equipment for clients where they also supply replacement parts.
An example
A company repairs industrial motors for a factory, which requires replacing internal copper coils. They wonder if this is job work. Based on this ruling, the repair is likely a composite supply of services because the motor repair is the main goal, and the coils are just part of that service. They should treat the entire contract as a service supply for GST purposes.
What you should do
If you perform similar repairs, review your contracts to see if they are composite supplies. Remember that an Advance Ruling only binds the specific business that asked and their local tax office. You cannot automatically apply this decision to your own business; consult your tax advisor to see if your specific contract matches this logic.
If you do nothing
If you incorrectly classify your work as job work when it is actually a composite supply, you may face penalties for incorrect tax filing. A tax officer may disagree with your classification during an audit and demand unpaid taxes, interest, and fines. Relying on a ruling that does not apply to your specific contract is a significant compliance risk.
The terms explained
- Job work
- Any treatment or process undertaken by a person on goods belonging to another registered person.
- Composite supply
- A supply consisting of two or more goods or services that are naturally bundled and supplied together in the ordinary course of business.
- Principal supply
- The main element of a composite supply that determines the tax rate for the entire transaction.
The ruling in detail
Authority for Advance Ruling
Alok Bhanuka, carrying on business under the trade name Bhanuka Enterprises
47/WBAAR/2018-19 dated 26/03/2019 · West Bengal
Questions before the authority
- Whether the repair/servicing of transformers owned by WBSEDCL is job work as defined under section 2(68) of the GST Act.
- Whether the said activity is a composite or mixed supply.
- If it is a composite supply, what is the principal supply and the rate of tax thereon.
- Whether the repaired transformers can be delivered to WBSEDCL against challans without raising tax invoices.
Facts
The applicant is engaged in the repair and servicing of transformers owned by WBSEDCL, which involves dismantling the units, replacing burnt coils and damaged parts, and testing the repaired equipment. The applicant contends that this activity constitutes job work under section 2(68) of the GST Act. The applicant also seeks clarification on the classification of this supply as composite or mixed and the applicable tax treatment.
Ruling
| Question | What the authority ruled |
|---|---|
| Job work status | Not job work The process involves transfer of property in goods and is not limited to labour. |
| Nature of supply | Composite supply Unless the contract specifies that goods and services are to be separately charged. |
| Principal supply | Service of repair Classifiable under SAC 998719. |
The authority held that the activity is not job work as defined under section 2(68) of the GST Act. It is classified as a composite supply where the principal supply is the service of repair of transformers. The authority declined to rule on the documentation requirement regarding the use of challans versus tax invoices.
Reasoning
The authority reasoned that because the process involves the replacement of parts and the transfer of property in goods, it exceeds the definition of job work under section 2(68). It determined that the activity is a composite supply under the GST Act because the goods and services are naturally bundled. Relying on the principle that the **dominant intention** of the contract is the maintenance and repair of the transformers, the authority concluded that the service component is the principal supply. The ruling specifically references section 2(68), section 2(119), and Schedule II of the GST Act, alongside Notification No. 11/2017 – CT (Rate).
Provisions relied on
- Section 2(68) of the GST Act
- Section 2(119) of the GST Act
- Section 97 (a) & (b) of the GST Act
- Section 103(2) of the GST Act
- Section 104(1) of the GST Act
- Schedule II of the GST Act
- Notification No. 11/2017 – CT (Rate) dated 28/06/2017
- State Notification No. 1135 – FT dated 28/06/2017
For the practitioner
This ruling clarifies that transformer repair involving the replacement of parts is a **composite supply of service** rather than job work. It provides practitioners with a precedent for classifying maintenance contracts where the supply of goods is ancillary to the service. However, it does not provide a ruling on the procedural documentation requirements for the transportation of goods.
Source
This is a summary prepared from the published order, which is a scanned document. It is a reading aid and not the authority: where the two differ, the order governs. Verify every provision against the original before relying on it.
Original order: https://www.gstcouncil.gov.in/sites/default/files/AAR/wb_47_2018-19_alok_bhanuka.pdf
Legibility of the scan, as read: high.
Prepared 20-10-2026.
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