GST on Under-Construction Flats: What Buyers Actually Pay

GST applies to under-construction property, not ready flats with an occupancy certificate — the one distinction that changes your entire cost comparison.

The one fact that matters most: it depends on the occupancy certificate

GST applies to under-construction property. It does not apply to a ready-to-move-in flat that already has its completion or occupancy certificate (OC) — on a completed property, you pay stamp duty and registration only, no GST. This single distinction is worth confirming before you compare prices between a ready flat and an under-construction one, since the headline price on an under-construction unit usually excludes GST until you check the payment schedule.

How the rate generally works

Since the GST Council's 2019 restructuring, residential under-construction property has generally been taxed at a lower rate for "affordable housing" (defined by specific carpet-area and price thresholds that differ for metro and non-metro cities) and a higher rate for other residential units, in both cases without the builder claiming input tax credit. Commercial under-construction space is typically taxed differently again. These rates and thresholds are set by the GST Council and have changed before — treat any specific percentage you're quoted as something to verify against the builder's actual GST-registered invoice or a CA, not something to assume from an old article (including this one).

What GST is actually charged on

GST applies to the construction/service portion of the price, not the underlying land value — builders typically account for this with a standard land-value deduction built into the calculation, so the effective rate you see quoted is usually already adjusted, not a rate applied to the full price.

The practical buyer takeaway

Ask directly whether the specific unit already has its completion/occupancy certificate — if yes, no GST applies at all.
If it's still under construction, ask for GST to be itemized separately in the payment schedule, not folded silently into a single "all-inclusive" number.
Get the applicable rate confirmed on the builder's GST-registered invoice, since this is the actual legal record of what you're being charged and at what rate.