GST on Affordable vs Luxury Flat Compared

Am I buying a 1% flat or a 5% flat?

You have shortlisted an under-construction flat, agreed on a price with the builder, and started doing the maths on your total outlay. Then someone mentions GST — and asks, "is your flat affordable or non-affordable?" You didn't know a flat had a category. But in India's GST regime, that one classification decides whether you pay 1% or 5% GST on the entire agreement value, a swing that can run into lakhs of rupees on an otherwise identical-looking transaction.

This isn't a vague "premium vs budget" label decided by the builder's marketing team. It's a precise, rule-based test written into the GST law: a combination of carpet area and price. Miss it by a square metre or a few thousand rupees, and your flat moves from the 1% bracket to the 5% bracket. This guide walks a first-time buyer, step by step, through how the segment is decided, what it costs in real numbers, and where buyers commonly trip up.

How GST segments residential property

Since the 2019 GST rate revision, India taxes under-construction residential real estate in two segments, both without input tax credit (ITC) available to the buyer:

• Affordable housing: 1% GST on the agreement value.
• Non-affordable (regular/luxury) housing: 5% GST on the agreement value.

A flat qualifies as "affordable" only when it satisfies both of the following conditions simultaneously — not one or the other:

1. Carpet area does not exceed 60 square metres (about 646 sq ft) in the metropolitan cities defined for this rule, or 90 square metres (about 968 sq ft) in non-metro locations.
2. Gross consideration (the value charged by the builder, effectively your total booking price before GST) does not exceed ₹45 lakh.

If either condition fails — the flat is larger than the area cap, or it costs more than ₹45 lakh, or both — the entire flat is taxed at 5%, not just the "excess" portion. There is no partial or blended rate. It is a binary switch.

Ready-to-move flats with an issued Occupancy Certificate (OC) at the time of sale fall outside this framework altogether: resale and OC-in-hand transactions do not attract GST, since GST applies only to the "supply of construction service," which ends once the building is complete and occupation-certified. This is one reason many risk-averse first-time buyers lean toward near-possession or OC-ready inventory.

The IBEF (Real Estate Industry in India, Feb 2026) sector overview notes that India's residential market has seen a pronounced move toward larger-format and premium product in recent years — a structural reason more urban inventory is landing in the 5% bracket by default, even for buyers who consider themselves middle-income. (IBEF, Real Estate Industry in India)

Step-by-step: check if your flat qualifies as affordable

Before you assume a rate, run through this checklist against your builder's cost sheet and floor plan:

1. Confirm the metro classification of your city. The 60 sqm cap applies to defined metros (commonly cited as covering areas like Mumbai MMR, Delhi NCR, Bengaluru, Chennai, Hyderabad, and Kolkata under the metro definition used for this rule); the 90 sqm cap applies elsewhere. Your city's classification is not optional — confirm it rather than assuming.
2. Pull the carpet area from RERA-registered documents, not the marketing brochure. Carpet area is a legally defined term under RERA and is smaller than the "super built-up area" typically advertised.
3. Check the consideration value as stated in the agreement for sale — this is the price the builder charges, and it must be at or under ₹45 lakh for the affordable rate to apply.
4. Verify both conditions together. A 55 sqm flat priced at ₹50 lakh in a metro fails the price test and is taxed at 5%, even though the area qualifies. A 65 sqm flat priced at ₹40 lakh in a metro fails the area test, even though the price qualifies.
5. Ask the builder directly which GST rate they are charging, and get it in writing in the cost sheet or allotment letter — do not infer it yourself and assume the builder agrees.

Because this determination sits at the intersection of a floor-plan detail and a price negotiation, it's worth running your own numbers rather than trusting a verbal assurance. You can use DrawMagic's construction cost calculator to sanity-check the underlying build cost against the price you're being quoted, so you understand the base before GST is layered on top.

Affordable vs non-affordable housing: the rate table

The illustrative figures above use a flat round number purely to show the arithmetic of the rate difference; always confirm the exact GST computation for your specific transaction with the builder and, ideally, a chartered accountant, since GST law and CBIC notifications can be updated.

Metro vs non-metro: the carpet-area rule in practice

The area threshold is where many buyers unknowingly disqualify themselves. A family looking at a "3BHK in the suburbs" in a metro city like Bengaluru or Chennai often finds that a genuinely comfortable 3BHK carpet area exceeds 60 sqm quite easily, pushing them into the 5% bracket regardless of price. In a non-metro city or a Tier-2 town, the more generous 90 sqm cap gives more flats — including reasonably spacious ones — a real shot at the 1% rate.

This is also why the affordable-housing GST rate skews heavily toward compact 1BHK and 2BHK configurations in big-city markets, and why builders in metro peripheries sometimes design specific "affordable" tower blocks purely to fit inside the 60 sqm/₹45 lakh box for a segment of buyers.

Mini scenario: a buyer weighing two units near the cap

Consider a buyer evaluating two units in the same project in a metro city:

• Unit A: 58 sqm carpet area, priced at ₹44.5 lakh. Both conditions are met → 1% GST → ₹44,500.
• Unit B: 63 sqm carpet area, priced at ₹47 lakh, in the same tower, one floor up, with a slightly larger balcony. Carpet area exceeds 60 sqm and price exceeds ₹45 lakh → 5% GST → ₹2.35 lakh.

The base price difference between the two units is ₹2.5 lakh. But once GST is added, the effective gap widens to roughly ₹4.4 lakh (₹2.5 lakh higher base + a ₹1.9 lakh larger GST bill). A buyer comparing "just the price per square foot" between these two units, without factoring GST, would badly underestimate the true cost delta. This is exactly the kind of comparison where running both scenarios through DrawMagic's financial planning workspace before booking pays off — it lets you see the segment's total-cost impact side by side rather than doing the sums on a notepad under sales-team pressure.

The carpet area vs super built-up area trap

This is the single most common mistake buyers make when trying to self-assess their GST segment. Builders market and often quote per-square-foot pricing on super built-up area, which includes your flat's share of common areas — lobbies, staircases, lift shafts, clubhouse, and sometimes even the security cabin. Carpet area, the figure that actually determines your GST bracket, is the usable area within your own walls and is typically 25–35% smaller than the super built-up figure quoted in the brochure.

A flat marketed as "1,000 sq ft" might have a carpet area of only 680–720 sq ft. If a buyer assumes the marketing number is the relevant one and concludes they're safely under 60 sqm (about 646 sq ft), they may be wrong — always ask for the RERA carpet-area figure specifically, in writing, before assuming your GST bracket.

Pro tips for getting your GST rate right

• Get the carpet area in writing from the RERA project registration documents, not just the brochure or a verbal quote from the sales executive.
• Ask for the GST computation on the cost sheet, broken out as a separate line, not bundled into a single "all-inclusive price."
• Re-verify if you change your unit or floor within the same project — a shift of even a few square metres between similar-looking units can move you across the threshold.
• Time your booking around OC status if you're on the fence — a near-complete project close to receiving its Occupancy Certificate may let you buy as a resale/OC-ready unit and avoid GST altogether, though this depends heavily on the builder's specific timeline and is not guaranteed.
• Use the stamp duty calculator alongside your GST estimate — stamp duty and registration are calculated independently of GST and are payable on top, so buyers should never combine or confuse the two costs.

Common mistakes to avoid

• Assuming "affordable housing" is a marketing term rather than a strict, dual-condition legal test.
• Using super built-up area instead of carpet area when self-checking eligibility.
• Forgetting that both the area cap and the price cap must be satisfied — meeting only one does not qualify the flat.
• Not asking the builder for the exact GST rate and computation in writing before signing the agreement for sale.
• Confusing GST (payable on under-construction property to the builder) with stamp duty and registration charges (payable to the state government), which apply regardless of GST status.
• Assuming a ready-to-move flat and an under-construction flat are taxed the same way — an OC-ready flat is outside GST's scope entirely.

How DrawMagic helps you plan around the GST cliff

Because the GST rate is baked into your builder's cost sheet, the smartest time to check it is before you commit, not after you've paid a booking amount. Run your shortlisted flat's numbers through the construction cost calculator to understand what the base build cost should reasonably be, cross-check statutory costs with the stamp duty calculator, and then bring both into DrawMagic's financial planning suite to see your all-in cost — GST, stamp duty, registration, and the base price — as a single number rather than several disconnected line items. If you're still comparing cities or want a broader sense of how these costs stack up across markets, DrawMagic's buyer resources are a good starting point before you narrow down a shortlist.

A value note before you book

None of the figures above should be treated as final tax advice — GST rates, metro classifications, and thresholds are set by CBIC notifications and can be revised. Before signing anything, ask your builder for the specific GST rate and get written confirmation of the carpet area and consideration value that support that rate, and where the stakes are high, have a chartered accountant review the computation. DrawMagic surfaces public information and calculators to help you plan; it is not a tax advisor, broker, or certifying authority for any transaction.

Key Takeaways

• Under-construction flats attract either 1% GST (affordable) or 5% GST (non-affordable), both without ITC — there is no blended rate.
• To qualify as "affordable," a flat must meet BOTH the carpet-area cap (60 sqm metro / 90 sqm non-metro) AND the ₹45 lakh price cap.
• Failing either condition — not both — is enough to push the flat into the 5% bracket.
• Carpet area, not super built-up area, is the legally relevant measure — always get it from RERA documents.
• Ready-to-move flats with an Occupancy Certificate fall outside GST's scope entirely.
• The rupee gap between 1% and 5% GST on a ₹44–45 lakh flat can exceed ₹1.7 lakh — always model it before comparing units.
• Metro city buyers should specifically confirm their city's classification, since the area cap differs from non-metro towns.
• Always get the GST rate and its basis (area + price) in writing from the builder before signing the agreement for sale.
• Use DrawMagic's free calculators and financial planning tools to model total cost, not just the headline flat price.

FAQ

Is GST charged on resale flats? No. GST applies to the construction service provided by a builder on an under-construction property. A resale flat, or any flat with an Occupancy Certificate already issued, is outside GST's scope.

Can I negotiate the GST rate with my builder? No — the GST rate is determined by law based on the carpet area and price of the specific unit, not by negotiation. What you can and should negotiate, or at least verify, is the accuracy of the carpet area and price figures used to classify your unit.

Does the ₹45 lakh cap include GST itself? The cap refers to the consideration/gross value charged by the builder for the unit, not the GST amount on top of it — but always confirm the exact computation basis with your builder or a tax professional for your specific transaction, since interpretation details can matter.