UPVC profiles are classified under HSN heading 3916 — "monofilament, rods, sticks and profile shapes of plastics" — with PVC profiles typically invoiced under 3916 20 (polymers of vinyl chloride), attracting 18% GST. Finished UPVC windows and doors fall under a different heading (3925, builders' ware of plastics). Getting the classification right keeps input credit clean for every buyer in the chain. Practical guide below — confirm current rates with your CA, as councils revise them.
The Classifications That Matter
| Item | HSN heading | Typical GST |
|---|---|---|
| UPVC profile lengths (raw material) | 3916 20 | 18% |
| Finished UPVC windows/doors & frames | 3925 20 | 18% |
| Galvanised steel reinforcement | 72xx (steel chapter) | 18% |
| EPDM gaskets / rubber seals | 4016 | 18% |
| Window hardware (locks, rollers, handles) | 8302 | 18% |
Rates as commonly applied; the GST Council revises schedules — verify current notification with your tax advisor before filing.
Why Classification Discipline Pays
- Input tax credit flows cleanly: a fabricator buying profiles at 18% offsets it fully against output tax on finished windows — but only with correct HSN on compliant invoices from GST-registered suppliers.
- Tender compliance: government buyers reject invoices with sloppy HSN; the classification is part of the submittal.
- E-way bills match: profile consignments above threshold move on e-way bills carrying the same HSN — mismatches invite transit checks and detention.
- Audit safety: consistent classification across purchase and sales registers is what a clean GST audit looks like.
Invoicing Practices to Demand from Your Supplier
- GSTIN printed and verifiable; HSN shown line-wise (mandatory at B2B invoice values).
- Profiles, steel, gaskets and hardware itemised under their own HSN lines — not lumped as "materials".
- Freight shown as it's actually contracted (composite vs separate supply affects treatment).
- E-way bill generated for qualifying loads with matching details.
Three Diamond UPVC invoices exactly this way — GST-registered, line-itemised, e-way billed — which is one reason contractors use our paper in tender files without anxiety. See credentials and bulk order terms.
FAQ
Q: Can a fabricator claim ITC on profiles bought for a client's project?
Yes — profiles are input material for taxable output supply (windows). Keep supplier invoices compliant and payments through banking channels.
Q: What happens if I buy from an unregistered trader?
No input credit — an instant ~18% cost disadvantage against competitors buying compliantly. Cheap cash material usually isn't cheap.
Q: Do you bill inter-state (AP, Karnataka, Kerala)?
Yes — IGST invoicing with e-way bills on our regular dispatch network.
Related: tender documentation checklist and the price guide.