Plastic water storage tanks above 300 litres and other builders' ware of plastics.
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Water Tank falls under HSN 3925, in chapter 39 (Plastics).
A plastic water tank above 300 litres is builders' ware of heading 3925, while smaller containers for carriage or storage are 3923. Both are 18%. Stainless steel and iron tanks are heading 7309 or 7310 depending on capacity.
| Code | Description |
|---|---|
| 392510 | Reservoirs, tanks, vats and similar containers above 300 litres |
| 392520 | Doors, windows and their frames of plastics (uPVC) |
| 392590 | Other builders' ware of plastics |
The GST rate on water tank is 18%.
| GST rate | Within a state | Between states |
|---|---|---|
| 18% | CGST 9% + SGST 9% | IGST 18% |
Compare other goods on the GST rates list.
The number of digits depends on your aggregate turnover in the previous financial year.
| Turnover last year | Digits | Write |
|---|---|---|
| Up to Rs 5 crore | 4 on B2B invoices, optional on B2C | 3925 |
| Above Rs 5 crore | 6 on every invoice | 392510, 392520, 392590 |
| Export or import | 8 on the shipping bill or bill of entry | From the Customs Tariff, chapter 39 |
Here is how a line for water tank looks on a tax invoice within one state: 2 × tank of 1000 litre at Rs 7,200.00 each, taxed at 18%. The figures are an example, not a market price.
| Item | HSN | Qty | Rate (Rs) | Taxable (Rs) | CGST (Rs) | SGST (Rs) | Total (Rs) |
|---|---|---|---|---|---|---|---|
| Water Tank | 3925 | 2 × tank of 1000 litre | 7,200.00 | 14,400.00 | 1,296.00 | 1,296.00 | 16,992.00 |
Sold to a buyer in another state, the same line carries IGST of Rs 2,592.00 instead of CGST and SGST. Make the full invoice with the GST invoice format: it fills in the tax split, round off and amount in words.
Chapter 39 (Plastics) covers: Plastics in primary forms (granules, resins) and articles of plastic.
Other pages in chapter 39
Products often bought, sold or invoiced together with water tank:
Water Tank falls under HSN 3925: plastic water storage tanks above 300 litres and other builders' ware of plastics. Common 6 digit codes are 392510 for reservoirs, tanks, vats and similar containers above 300 litres and 392520 for doors, windows and their frames of plastics (uPVC).
18%: CGST 9% plus SGST 9% on a sale within a state, or IGST 18% on a sale between states.
If your aggregate turnover in the previous financial year was up to Rs 5 crore, write the 4 digit code 3925 on B2B invoices (optional on B2C invoices). Above Rs 5 crore, write 6 digits, such as 392510, on every invoice. Shipping bills and bills of entry need the full 8 digit code from the Customs Tariff.
Rates checked on 13 October 2026 against the GST rate notifications in force (GST 2.0 from 22 September 2025). Descriptions are in our own words and are a guide, not a ruling: for a disputed or high value item, check the notification or ask your tax adviser.