The Real GST Difference Between Under Construction & Move In Ready Properties

No. And this is the most important thing to understand upfront.

GST on under-construction flats applies. If a project is still under construction or construction is done but a completion certificate is not received yet, GST will be charged on your home purchase.

Does GST apply on ready-to-move homes? No, not if the builder has received the Completion Certificate (CC) from the local authority before the sale. Once that certificate is issued, the property is treated as a finished product, not a service. And here GST only applies to services, not finished goods.

This single distinction, the completion certificate of the project decides whether GST is applicable or not

A completion certificate is one of the important and crucial documents to look at while buying flats in Mumbai, so it’s worth understanding what it actually is.

A Completion Certificate is a government-issued official document that certifies that a building has been built following the approved plan and all necessary codes and standards of construction. This document is the government’s method of saying, “This building is complete and safe and can be used for its intended purpose.”

For buyers, the CC matters for two reasons. One, it means the project is legally complete. Two, it means no GST on your purchase. If a builder sells you a flat before receiving the CC, the transaction is treated as an under-construction sale and GST applies, regardless of how "ready" the flat looks physically.

Always ask for the CC status before signing anything.

As of April 2019, there are two GST rates applicable on under-construction residential properties:

1% GST — for affordable housing projects (subject to government-defined price limits and carpet area criteria)

5% GST — for all other residential projects (non-affordable / standard / premium housing)

No Input Tax Credit (ITC) is available to buyers under either rate. This means the builder cannot pass on any tax savings to you, what you see is what you pay.

Example: How Much GST Do You Actually Pay?

This is where it gets real.

Example 1 — Affordable Housing You're buying a flat worth ₹40 lakhs under an affordable housing scheme. GST at 1% = ₹40,000 extra. Manageable, but still an additional cost to plan for.

Example 2 — Standard Residential Project You're buying a flat worth ₹80 lakhs in a regular under-construction project. GST at 5% = ₹400,000 extra. That's ₹4 lakhs on top of your flat cost, not a small number.

Example 3 — Mumbai Premium Segment You're buying a flat worth ₹2 crores in Mumbai, which is not unusual at all in areas like Andheri, Mulund, or Thane. GST at 5% = ₹1,000,000. Ten lakhs. Just in GST. Over and above stamp duty and registration.

This is why understanding GST on under-construction flats before you commit is non-negotiable, especially in Mumbai's market.

Here's the clean answer: There is ZERO GST on ready-to-move property. If the property has a Completion Certificate, you pay no GST at all. You still pay stamp duty and registration charges that apply to every property purchase, regardless, but GST is completely out of the picture.

The GST on ready-to-move property benefits are straightforward:

• You save 1% to 5% of the property value upfront

• On a ₹1 crore flat, that's ₹5 lakhs back in your pocket

• On a ₹2 crore flat, that's ₹10 lakhs saved

• No ambiguity, no calculations, no surprises

This is an important consideration for purchasers who already have difficulties with their finances. It can cover your interiors. It can reduce your loan amount. It can simply stay in your savings.

But Ready-to-Move Flats Cost More, Don't They?

Yes, usually. Ready-to-move flats in Mumbai and other cities tend to have a higher base price than under-construction projects. In these situations, builders must include the amount of capital they had to invest to complete the construction as part of the total sales price for a finished apartment. As a result, the market charges a premium to purchase a home that has an occupancy permit.

So the real question isn't just about GST. It's about the total cost of ownership.

Here's a simple way to think about it:

If an under-construction flat is priced at ₹1.5 crore but attracts 5% GST, your effective cost is ₹1.57 crore before stamp duty and registration.

If a ready-to-move flat in the same area is priced at ₹1.6 crore with zero GST, your effective cost is ₹1.6 crore, and you move in immediately.

The gap is ₹3 lakhs. But the ready home gives you immediate possession, zero construction risk, and no waiting.

That's the real calculation buyers need to make, not just comparing brochure prices.

This naturally increases demand for ready-to-move flats in Mumbai.

Especially among:

• Families

• Working professionals

• NRI buyers

• Buyers upgrading homes

Despite the GST burden, under-construction project investment continues to attract buyers, and for good reasons.

Lower entry price- Under-construction projects are typically priced lower at launch. If you're buying early in a project's lifecycle, you're getting in before the market catches up.

Appreciation potential- If the project is in a growing micro-market near an upcoming metro station, a new highway, or a developing commercial zone, the appreciation between booking and possession can outpace the GST cost significantly.

Payment flexibility- Under-construction homes usually come with construction-linked payment plans, which spread your outflow over time. This can ease cash flow pressure compared to paying the full amount upfront for a ready home.

More options- In high-demand areas of Mumbai, ready-to-move inventory is limited. If you want a specific floor, a specific view, or a specific configuration, being under construction gives you choices that the resale market often can't.

The key is to evaluate the total picture: GST cost vs. price advantage, possession timeline, developer credibility, and the growth trajectory of the location.

If any of the following describe you, a ready-to-move home deserves serious consideration.

• You need immediate possession. Whether you're shifting from a rented house, moving cities, or simply done with waiting, a ready home gives you keys on day one.
• You want to avoid GST completely. The savings are real and significant. If your budget is tight, this is money that stays with you.
• Construction risk makes you uncomfortable. Delays happen. Projects get stuck. Builders face liquidity issues. A completed project eliminates all of that uncertainty entirely.
• You want to see before you buy. With a ready home, you're not buying from a floor plan. You walk in, see the actual flat, the actual view, and the actual finish quality, and then decide.
• In Mumbai's market specifically, ready-to-move inventory in areas like Mulund, Thane, Andheri West, Borivali, and Chembur is worth exploring if these factors matter to you.

GST and stamp duty are two completely different charges, and both apply to under-construction purchases. Many first-time buyers assume GST replaces stamp duty. It doesn't. Stamp duty in Maharashtra is currently around 5-6% of the property value (plus 1% metro cess in some areas), and registration charges are additional.

So on an under-construction flat worth ₹1.5 crore in Mumbai, here's roughly what you're looking at beyond the base price:

• GST (5%) — ₹7.5 lakhs

• Stamp duty (~6%) — ₹9 lakhs

• Registration — ₹30,000 approximately

That's nearly ₹17 lakhs in taxes and charges on a ₹1.5 crore flat. Plan for it.

On a ready-to-move property, the GST component drops to zero, and that alone changes the math considerably.

GST isn't something to figure out after you've decided on a property. It's something to factor in before you even shortlist.

Under-construction flats attract 1% or 5% GST depending on the category. Ready-to-move homes, those with a Completion Certificate, attract zero GST. The difference in real rupee terms can range from a few thousand to several lakhs depending on your budget.  Neither option is universally better. Under-construction project investment makes sense if you're buying early in a growth corridor and can absorb the GST cost against future appreciation. Ready-to-move makes sense if you want clarity, immediacy, and a lower effective cost right now.

What matters is that you go in with open eyes, knowing exactly what you're paying and exactly why.

Keystone Real Estate Advisory focuses on assisting buyers in knowing the full costs of homes, retail/rental commercial properties, and land in addition to the published price of these properties. For example, if you are evaluating a property that is work in progress or a completed property in Mumbai, our team will provide you with an honest, complete picture of that property prior to you making your decision.

Go to our website to review the properties available in the different micro-markets of Mumbai and contact us to have a detailed discussion about what types of properties fit your budget and timeline.

FAQs:

1. Does GST apply to all property purchases in India?
A: No. GST applies only to under-construction properties. Ready-to-move homes with a valid Completion Certificate (CC) do not attract GST.

2. What is the GST rate on under-construction flats?
A: Affordable housing projects attract 1% GST, while other residential under-construction properties attract 5% GST without Input Tax Credit (ITC).

3. Is there GST on ready-to-move flats?
A: No. If the project has received a Completion Certificate before the sale, buyers do not have to pay GST. However, stamp duty and registration charges still apply.

4. Why do many buyers still choose under-construction properties despite GST?
A: Under-construction projects often offer lower launch prices, flexible payment plans, and higher appreciation potential in developing locations.

5. Is GST the only additional cost when buying an under-construction flat?
A: No. Buyers must also budget for stamp duty, registration charges, and other applicable fees in addition to GST.