GST on Dadar West Flats: Under-Construction vs OC-Received -- What You Actually Pay in 2026

A Rs.4 crore under-construction flat in Dadar West costs Rs.20 lacs more than the price tag suggests -- because GST is silent in most builder marketing sheets. Property Butler tracks 66 active units across 12 projects in Dadar West; roughly half attract GST, half do not. Comparing EIRENE at Rs.3.48 crore with AVHAD Oasis at Rs.2.69 crore is not apples to apples until you account for the tax layer.

The GST Rule in Plain Terms

Under-construction flat (no Occupancy Certificate): 5% GST on the agreement value. OC-received flat: 0% GST. This flows from Section 9 of the CGST Act and cannot be waived by the builder. Every installment paid before OC is received attracts 5% GST.

How the Tax Stack Works on a Flat Purchase

For a Rs.4 crore under-construction flat: Rs.20 lacs GST + Rs.25.2 lacs stamp duty (6% applied on Rs.4.2 Cr including GST, per Bombay HC ruling) + Rs.30,000 registration = Rs.45.5 lacs in taxes and duties before you own the flat. For a Rs.4 crore OC-received flat: Rs.0 GST + Rs.24 lacs stamp duty + Rs.30,000 registration = Rs.24.3 lacs. The silent Rs.21 lacs difference is why two similar-priced Dadar West flats can have radically different real costs.

Maharashtra stamps on the agreement value inclusive of GST (the Bombay High Court confirmed this for residential properties). So stamp duty on an under-construction flat is slightly larger than on an equivalent OC-received flat. On a Rs.4 Cr flat, stamp duty is Rs.25.2 Lacs vs Rs.24 Lacs -- an extra Rs.1.2 Lacs from the GST-on-stamp compounding that most buyers miss.

Every Active Dadar West Project -- GST Classification

Project	Developer	Possession	GST	GST Cost (sample unit)
AVHAD Oasis	AVHAD Group	OC Received	0%	Rs.0
Park Abode	Shree Siddhivinayak	Ready to Move	0%	Rs.0
Dipti Royal Arc	Dipti Group	OC Received	0%	Rs.0
The Ruby	Rohan Lifescapes	OC Received	0%	Rs.0
Promesa West End	Virtue Enterprise	Apr 2026	5% until OC	Rs.17.5 Lacs (Rs.3.5 Cr 2BHK)
The Palette	Suraj Estate	Sep 2026	5% GST	Rs.34.2 Lacs (Rs.6.84 Cr 2BHK)
Pearl Bay View	Pearl Concept	Dec 2026	5% GST	Rs.24 Lacs (Rs.4.80 Cr 2BHK)
Janai Heritage	Sugee Group	Dec 2026 / Sep 2029	5% GST	Rs.37.5 Lacs (Rs.7.5 Cr 2BHK)
Sakura Project	Buildarch	Dec 2026	5% GST	Rs.19.6 Lacs (Rs.3.92 Cr 2BHK)
EIRENE	West Avenue	Mid 2027	5% GST	Rs.20.95 Lacs (Rs.4.19 Cr 3BHK)
Saffron Project	Buildarch	Dec 2027	5% GST	Rs.28.8 Lacs (Rs.5.76 Cr 3BHK)
Samruddhi	Sugee Group	Aug 2027	5% GST	Rs.65.2 Lacs (Rs.13.04 Cr 4BHK)
Mangesh Sadan	Sugee Group	Dec 2029	5% GST	Rs.21.7 Lacs (Rs.4.34 Cr 2BHK)

Side-by-Side: EIRENE vs AVHAD Oasis -- The True Cost Gap

AVHAD Oasis 2BHK -- OC Received

Base: Rs.3.15 Cr

GST: Rs.0

Stamp duty (6%): Rs.18.9 Lacs

Registration: Rs.30,000

Rent while waiting: Rs.0

All-in: Rs.3.34 Cr. Move in Day 1.

EIRENE 2BHK -- Mid 2027

Base: Rs.3.48 Cr

GST (5%): Rs.17.4 Lacs

Stamp duty (on Rs.3.65 Cr): Rs.21.9 Lacs

Registration: Rs.30,000

14 months rent at Rs.50K/mo: Rs.7 Lacs

All-in: Rs.3.92 Cr. Move in ~Jul 2027.

The sticker price gap is Rs.33 lacs. The real cost gap -- after GST, GST-inflated stamp duty, and 14 months of holding costs -- is approximately Rs.58 lacs. That is the number that belongs on your comparison spreadsheet.

When the Under-Construction GST Premium Is Worth Paying

Appreciation play: The Palette at Rs.6.84 Cr (Sep 2026) needs only 5% appreciation by possession to absorb its Rs.34.2 Lac GST cost. Dadar West has averaged 8-12% annual appreciation across the 2021-2026 cycle per Property Butler market data. Investors with a 3-5 year horizon routinely find the GST absorbed by capital gain.

Configuration access: AVHAD Oasis, Park Abode, and Dipti Royal Arc offer limited configuration options. Sea-facing 4BHKs, Shivaji Park-fronting floors, and Jodi units are only available in under-construction projects. GST is the price of access to the configurations that actually match your requirements.

Payment flexibility: Dadar West under-construction projects typically offer 10:20:20:50 or construction-linked payment plans. OC-received projects require 90% within 30 days. For buyers with phased liquidity -- say a maturing FD or an ESOP vesting schedule -- the payment flexibility of under-construction may justify the GST premium.

GST on Parking and Other Charges -- The Hidden Layer

Charge Type	GST Rate	Notes
Flat (under-construction)	5%	On entire agreement value until OC
Car parking (under-construction)	18%	Rs.6-8 Lac parking = Rs.1.08-1.44 Lac GST
Maintenance deposit / corpus	Exempt	Interest-free security deposits are GST-free
Club membership	18%	If charged separately as a service
Flat (OC received)	0%	No GST on completed residential flat

Parking in premium Dadar West projects (The Palette, Janai Heritage, Samruddhi) costs Rs.8-12 lacs per space. At 18% GST, that is Rs.1.44-2.16 lacs in tax on the parking alone -- not included in the headline 5% calculation. Always ask for a full itemised breakout of all charges and their respective GST rates before signing.

Five-Step GST Compliance Checklist Before Signing

Verify builder GSTIN on gst.gov.in -- confirm they are registered and filing regularly. An unregistered builder cannot legally collect GST.
Get the GST breakout in writing -- the Sale Agreement must show base price and GST separately. If the builder quotes "all-inclusive" only, insist on a separate breakup letter before paying any booking amount.
Separate line for parking charges -- confirm parking is listed separately (18% GST, not 5%) so you know your true cost before the demand letter.
Note the OC-trigger language -- the Sale Agreement should specify that GST obligations cease on the date of OC receipt. Any ambiguous wording on this should be clarified by a lawyer before signing.
Save all GST invoices -- needed to establish your full cost of acquisition for capital gains computation when you sell in future.

Frequently Asked Questions

Can I negotiate with the builder to absorb the GST?

Some builders absorb GST as a sales incentive on lower-ticket units (under Rs.3.5 Cr in Dadar West). Above Rs.5 Cr, no active Dadar West builder currently absorbs GST. What you can negotiate: a base price discount that effectively offsets part of the GST burden, or additional inclusions (parking, club membership) at no charge. Never agree to a structure where GST is "avoided" rather than absorbed -- that creates legal liability for both parties.

Can I claim ITC on the GST I pay for my flat?

No. Individual buyers of residential flats cannot claim GST Input Tax Credit regardless of whether they are GST-registered. ITC on residential property is blocked under Schedule III of the CGST Act. Even if you are a GST-registered business owner buying as an investment, you cannot reclaim the 5% paid on a residential flat purchase.

Does GST continue if the builder delays possession?

Yes. GST applies on every payment made before the OC is received, regardless of delay. You cannot withhold GST as leverage against a delayed builder. Your remedy for delay is Section 18 RERA compensation (interest at 2% above SBI MCLR per month), not a GST exemption. Continue payments and pursue RERA compensation separately.

Is stamp duty calculated on the price before or after adding GST?

After -- Maharashtra stamp duty is applied on the agreement value inclusive of GST, per Bombay High Court precedent. On a Rs.4 Cr flat with Rs.20 Lac GST, stamp duty applies on Rs.4.2 Cr, costing Rs.25.2 Lacs vs Rs.24 Lacs on a comparable OC-received flat. The extra Rs.1.2 Lacs is the compounding effect of GST on stamp duty that most buyers miss.

If I buy a resale allotment of an under-construction flat, does GST apply?

It depends on the transaction structure. If you are taking over a booking agreement before registration (an allotment transfer), GST may apply as this is treated as a supply of service under CGST law. If the flat is already registered in the first buyer's name and you are buying it as a secondary-market resale, GST generally does not apply. Consult a CA for your specific transaction before paying.