Studio Matrx Monthly · Volume 1 · Issue 1 · June 2026
Amogh N P
 In loving memory of Amogh N P — Architect · Designer · Visionary 
Door GST Calculator

Door GST Calculator

Enter a base price to add 18% GST, or a GST-inclusive amount to extract the tax. Pick the item to map its HSN code — wooden 4418, uPVC 3925, steel 7308, aluminium 7610, hardware 8302, locks 8301. All at 18%.

18%

Your figures

HSN 4418 · GST 18%

Builders' joinery of wood — doors, frames & thresholds (flush, panel, solid wood, teak).

Total payable (incl. 18% GST)

0

GST @ 18% = 2,160 · Wooden / flush door · HSN 4418

Base

₹12,000

taxable value

GST @ 18%

₹2,160

Total

₹14,160

incl. GST

Base vs GST split. Indicative — verify the exact HSN with your supplier's invoice.

Supply-only vs supply-and-fix (works contract)

Supply only

You buy the door (and hardware) as goods — billed under the item's HSN (4418 / 3925 / 7308 / 7610 / 8302 / 8301) at 18% GST. Installation by your own carpenter is separate.

Supply & fix (works contract)

When the vendor supplies and fixes the door as a single composite contract for immovable property, it's a works contract (SAC 9954), taxed as a service — generally 18% GST for most building work. Rate is the same here, but the HSN/SAC and input-credit treatment differ, so check how your invoice is worded.

Indicative only — not tax advice. GST rates and classifications change; confirm with your CA or the supplier's tax invoice before relying on these figures.

Sense-check the GST and the spec

DesignAI can confirm the right HSN for your door, flag supply-only vs works-contract billing and sanity-check the all-in price for your city.