GST Rate for Hand Pump Water Disinfection Reactor Attachment
Maharashtra AAR ruled that a water disinfection reactor fitted to hand pumps is a water purifier taxed at 18% GST.
- Ruling
- NO.GST-ARA- 47/2017-18/B- 54 dated 22/6/2018
- Dated
- 22 Jun 2018
- 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
- Company asked if its water disinfection reactor counts as a hand pump part
- Hand pump parts enjoy lower tax rates than general water purifiers
- Authority ruled the reactor performs an independent water purification function
- The product falls under HSN 8421 21 90 attracting 18 percent GST
In short
The company manufactures a reactor device that destroys microbes in water using fluid dynamics. While designed to be retrofitted onto manual hand pumps, it can also attach to water tanks and pipelines. The company asked tax authorities whether the device should be taxed as a hand pump part or as an independent water purifier under GST.
What has changed
How it worked before
Before this ruling, businesses making specialized attachments for machinery often classified them as parts of the host machine to claim lower GST rates.
What has changed
In order GST-ARA- 47/2017-18/B- 54 Mumbai, the Maharashtra Authority for Advance Ruling decided that the reactor is a water purifying apparatus under HSN code 8421 21 90, not a pump part under HSN 8413. Because a hand pump pumps water without this attachment, the reactor has an independent identity and function. It is therefore subject to 18% GST (9% CGST and 9% SGST).
Who this affects
Businesses manufacturing accessories or add-on equipment for machinery that perform separate jobs like filtering, purifying, or heating.
An example
A business in Gujarat manufactures a UV sterilization box designed to fit onto commercial milk collection pumps. The owner wants to classify it as a pump part under lower GST rates. Based on the principle in this ruling, tax authorities would likely treat the sterilizer as a standalone appliance because the pump works fine without it. The owner should seek professional tax advice or a separate ruling rather than assuming pump part tax rates apply.
What you should do
Evaluate whether your product performs a standalone function separate from the main equipment it attaches to. Note that an advance ruling binds only the business that applied for it and their specific tax officer. If you have a similar product, consult a tax professional or apply for your own advance ruling before fixing your tax rates.
If you do nothing
If you incorrectly classify an independent device as a machine part to pay lower GST, tax authorities can demand the unpaid tax balance. You will also face an interest charge of 18% per year on the unpaid amount plus tax penalties. This can lead to costly tax demands and administrative disputes.
The terms explained
- input tax credit
- The GST you pay on buying goods or services for your business, which you can subtract from the GST you collect on sales.
- HSN code
- A standardized code number used in the GST system to classify goods and determine their correct tax rate.
- advance ruling
- An official written decision by tax authorities answering a specific tax question submitted by a business.
- tariff heading
- A specific numerical category in the official tax list under which related goods are grouped for GST.
The ruling in detail
Authority for Advance Ruling
TARALTEC SOLUTIONS PRIVATE LIMITED
NO.GST-ARA- 47/2017-18/B- 54 dated 22/6/2018 · Maharashtra
Questions before the authority
- Classification of goods (i.e Reactor used in Hand Pump for water disinfection)
- GST Rate Applicability on reactor machine which is used in Hand Pump for water disinfection
Facts
The applicant manufactures a 'Reactor' used for water disinfection by eliminating water-borne microbes using fluid dynamics. The reactor can be retrofitted into hand pumps, as well as motorized pipelines, overhead tanks, and sewage treatment systems. The applicant sought a ruling on whether the reactor qualifies as a part of a hand pump under HSN Heading 8413.
Ruling
| Question | What the authority ruled |
|---|---|
| Classification of Reactor used in Hand Pump for water disinfection | Classifiable under Tariff Heading 8421 21 90 of the GST Tariff. |
| GST Rate Applicability on reactor machine used in Hand Pump | Tax @ 9% CGST and 9% SGST (18% total). |
The Authority held that the reactor is not an essential part of a hand pump and performs an independent function of water purification. The product is classifiable under Tariff Heading 8421 21 90. Consequently, it attracts GST at the rate of 18% (9% CGST and 9% SGST).
Reasoning
The Authority observed that the essential function of a hand pump is lifting water, which it accomplishes without the reactor. The reactor performs a distinct function of purifying water and is versatile enough to be used in various other pipeline systems. Relying on Section Note 2 to Section XVI of the HSN, the Authority held that articles having an independent identity and function covered under a specific heading cannot be classified as parts of a general machine. Therefore, the product **cannot be classified as a part of a hand pump under Heading 8413** and must be classified as a water purifying apparatus under **Heading 8421 21 90**.
Provisions relied on
- Section 97 of CGST Act, 2017
- Section 98 of CGST Act, 2017
- Section Note 2 to Section XVI of the GST Tariff
- Heading 8413
- Heading 8421 21 90
For the practitioner
This ruling establishes that retrofitted attachments performing independent functions cannot be classified as 'parts' of host machinery if they have standalone utility across multiple applications. Tax practitioners should note that **Section Note 2 to Section XVI prioritizes specific functional classification** over host-machine part classification.
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/mah_aar_47_2017-18_b-54_22.06.2018_tspl.pdf
Legibility of the scan, as read: high.
Prepared 19-10-2026.
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