Benefits of Buying Under Construction Property in Mumbai
Dasadia Editorial Team · Updated August 2026
A sales office on a Saturday afternoon. The rate on the sheet is 17% below what the finished tower down the road is quoting, the payment plan asks for 10% now, and the executive is drawing a graph of what the flat will be worth at possession. It looks like the easiest decision you’ll make all year.
It often is the right decision. The reasons usually aren’t the ones on the sheet.
Buying under construction in Mumbai carries several real advantages, and RERA has removed a great deal of the risk that made the choice frightening a decade ago. But the headline discount is the least dependable of those advantages, because GST, three years of rent and the possibility of delay consume most of it. This guide sets out the benefits that survive arithmetic, runs the full cost comparison on an Andheri East example, and shows what a single year of delay does to the answer. If you only read one section, make it the one with the table, because that’s where the sales pitch and the maths part company.
Key takeaways
- Ready possession in Mumbai commands roughly 15% to 25% over comparable under-construction stock, with wider estimates of 10% to 30% depending on the source and the micro-market.
- GST of 5% without input credit applies to under-construction flats above ₹45 lakh. Ready flats holding an Occupancy Certificate pay none.
- On a ₹2 crore Andheri East example with a 17% discount and a three-year build, the net advantage of buying under construction works out at about ₹5 lakh, not ₹35 lakh.
- One year of delay turns that ₹5 lakh advantage into a ₹2.6 lakh disadvantage, on rent alone.
- The advantage is far larger if you are not currently paying rent, because the carrying cost is what erases it.
- Ready inventory in Mumbai is picked over. Good projects sell out during construction, so what remains ready is usually resale, leftover configurations or cancelled bookings.
- MahaRERA entitles you to interest at SBI MCLR plus 2% on amounts paid if possession is delayed, or a full refund with interest if you exit.
- Interest paid before possession is deductible in five equal instalments after it, under Section 24(b).
The benefits that hold up
Seven advantages come up in every discussion of under-construction property. Six of them are sound. The first is the one that needs testing, and the next section tests it.
- Lower entry price. Ready possession commands 15% to 25% more than comparable under-construction stock in the same area, and in South Mumbai that gap translates to ₹1.5 crore to ₹4 crore on a mid-market 3 BHK.
- Staged payment. Construction-linked plans spread the outflow across years, and your bank disburses in tranches, so you service interest only on what has been drawn rather than on the full loan from day one.
- First pick of inventory. Floor, wing, view and layout are all still available. This is a bigger benefit in Mumbai than most buyers realise.
- The discount closes at possession. A flat bought below ready pricing becomes a ready flat when the Occupancy Certificate arrives, so you capture the convergence on top of ordinary market movement.
- RERA protections. Escrow of 70% of collections, a committed possession date, interest on delay, a 3% cap on carpet area deviation and five-year structural defect liability.
- Deferred tax relief. Interest paid during construction is not lost. It is claimable in five equal instalments after possession under Section 24(b).
- Specification input. Flooring, fittings and minor layout changes are still negotiable while the slab is being poured, which is rarely true of a finished flat.
What the discount is actually worth
Take a 650 square foot 2 BHK in Andheri East. Ready pricing sits near ₹2.05 crore at the locality rate. The under-construction equivalent is offered at ₹1.70 crore, a discount of 17%. Assume a three-year build, a male buyer, and ₹65,000 a month of rent in the meantime, which is where a comparable Andheri East 2 BHK actually lets.
Read the last two rows together.
The headline discount is ₹35 lakh. The advantage that reaches your pocket is ₹5.2 lakh, which is about 2.5% of the purchase. GST takes ₹8.5 lakh of the gap, and three years of rent takes ₹23.4 lakh. What remains is real, and it is a good deal smaller than the sales sheet implies. We have not seen a single developer presentation that nets these three lines against each other, which isn’t dishonest so much as incomplete, since no developer is obliged to model what your rent costs you. That part is your job, and it takes about ten minutes with a calculator.
Two assumptions carry that number, and both are worth stating. The flat is valued at possession using ordinary market growth of 5% a year applied to ready pricing, and the project delivers on schedule. Change either and the answer changes.
What one year of delay does
Run the same example with possession arriving four years after booking rather than three. Nothing else changes. You pay twelve more months of rent, which is ₹7.8 lakh, and your total outlay rises to ₹2.202 crore. The under-construction buyer is now ₹17.1 lakh ahead against the ready buyer’s ₹19.7 lakh.
A single year of delay doesn’t just erode the advantage. It reverses it.
That is the honest case for paying attention to the developer’s track record rather than the discount. MahaRERA gives you a remedy, interest at SBI MCLR plus 2% on the amounts you have paid, or a full refund with interest if you walk away. Both are worth having. Neither gives you back the flat you wanted or the years you spent renting while you waited for it.
Check the committed possession date on the MahaRERA registration, then check what the same developer promised on their last two projects and when those actually completed. In our experience that single comparison tells you more than any brochure, and it doesn’t take an afternoon.
Why ready inventory in Mumbai is thinner than it looks
This benefit gets almost no attention and it deserves more. In Mumbai the best projects sell out during construction, so what is available as ready possession is usually one of three things. Resale units, where you pay stamp duty on the higher resale value but get a finished flat and an established society. The developer’s last few unsold units, which are often the configurations nobody wanted, meaning the ground floor, the flat with no view or the odd layout. Or cancelled bookings, which surface occasionally and go quickly. None of those three is a bad purchase in itself, but none of them is the flat you would have chosen off a floor plate either, and you’ll pay ready pricing for the privilege.
The market splits accordingly. Of more than 700 live South Mumbai listings tracked in May 2026, roughly 40% were ready or had received the Occupancy Certificate and about 60% were under construction. Worli holds the largest pool of completed inventory. Mahalaxmi is almost exclusively under construction. Parel and Dadar offer the best ready-possession value, with 2 BHKs from around ₹3.15 crore.
So when someone tells you to wait for ready inventory, ask what will actually be left to choose from. In a good building, the answer is often very little, and rarely the unit you would have picked.
How RERA changed the risk
Much of the fear around under-construction property in Mumbai dates from before 2017, and it hasn’t caught up. A registered project now has to hold 70% of buyer collections in a dedicated escrow account released against construction progress, publish a committed possession date, and carry structural defect liability for five years from handover. Carpet area cannot deviate by more than 3% from what was promised, and beyond that you are owed a refund with interest. Every one of those obligations is verifiable on the portal before you pay anything.
None of this makes a project safe. It makes the risk visible, which is a different thing and a considerably more useful one. Over 60% of new homebuyers now choose under-construction property, and that shift tracks the regulatory change closely.
The rules are public and the portal is free to search.
Verify the registration yourself rather than accepting a certificate photograph, and confirm the number belongs to your building and phase. It’s a two-minute check that almost nobody does.
Who this suits, and who it doesn't
Under construction works well if
- You are not currently paying rent, because the carrying cost is what erases the advantage.
- The discount to comparable ready stock is at the upper end of the range rather than the lower.
- You want a specific floor, wing or layout that ready inventory will not offer.
- Your horizon is five years or more, so a delay of a few quarters is inconvenient rather than damaging.
- The developer has a verifiable delivery record on at least two completed projects.
Buy ready instead if
- You need to move within a year, or you are paying rent that you cannot comfortably absorb alongside an EMI.
- You want rental income from the flat starting immediately.
- The price gap to under-construction stock in that micro-market is under 10%.
- You want to see the actual flat, the actual light and the actual society before committing.
- You would struggle to fund a delay of a year or more without stress.
If the discount on offer is under 10% and you’re currently renting, buy ready. The arithmetic doesn’t support waiting, and no amount of projected appreciation changes that, because the ready flat appreciates too.
Frequently asked questions
Yes, on the base price. Ready possession commands roughly 15% to 25% more than comparable under-construction stock, with wider estimates of 10% to 30%. After GST, stamp duty and rent paid while waiting, the effective gap is far narrower.
5% without input tax credit on residential flats above ₹45 lakh, and 1% on affordable housing priced up to ₹45 lakh with carpet area up to 60 square metres. Ready flats with an Occupancy Certificate attract no GST at all.
Usually not. Developers quote the agreement value, and GST is payable on top. Get written confirmation either way before you book, since on a ₹1.8 crore flat the difference is ₹9 lakh.
No. Stamp duty in Maharashtra is charged on the agreement value or the ready reckoner value, whichever is higher, and GST sits outside that base. Registration is 1% capped at ₹30,000.
On a ₹2 crore Andheri East example with a 17% discount and a three-year build, the net advantage is around ₹5 lakh, roughly 2.5% of the purchase. It is worth considerably more if you are not paying rent during construction.
In the same example, one extra year of rent at ₹65,000 a month costs ₹7.8 lakh, which turns a ₹5.2 lakh advantage into a ₹2.6 lakh disadvantage. Delay is the single largest risk to the case for buying under construction.
Under MahaRERA, interest at SBI MCLR plus 2% on the amounts you have paid, for the delay period, or a full refund with interest if you choose to exit. Permissible force majeure extensions apply.
Not in the year you pay it. Interest paid during the construction period is claimable in five equal instalments starting from the year possession is taken, under Section 24(b).
The bank disburses in tranches linked to construction progress, and you service interest only on the amount drawn until the full loan is disbursed. That keeps early outflow low but means your EMI rises through the build.
RERA caps the deviation at 3% between the carpet area promised and delivered. Beyond that the promoter must refund the excess amount with interest. Verify the registered carpet area on the MahaRERA portal.
A registered promoter must deposit 70% of the money collected from buyers for a project into a dedicated account, to be used only for that project’s land and construction costs, released against certified progress.
Because good projects sell out during construction. What remains available as ready is typically resale stock, the developer’s unsold configurations such as ground floor or no-view units, or the occasional cancelled booking.
It can be, because the discount to ready pricing closes when the Occupancy Certificate arrives, on top of ordinary market movement. That gain is real but it is conditional on the project completing near its committed date.
Be careful. The rent you pay during construction is what erases the discount. If the gap to ready stock in your micro-market is under 10% and you are renting, ready possession is usually the stronger call.
Where a developer bills them separately rather than including them in the agreement value, such charges can attract GST at 18%. Ask for the full payment schedule with every line item and its tax treatment before booking.
Verified key facts
- Ready possession property in Mumbai costs roughly 15% to 25% more than comparable under-construction units in the same area or project (Property Butler, May 2026).
- Other published estimates of the gap range from 5% to 20% and 10% to 30%, so treat any single figure as indicative.
- GST on under-construction residential property is 5% without input tax credit above ₹45 lakh, and 1% for affordable housing up to ₹45 lakh with carpet area up to 60 square metres.
- Ready-to-move flats holding an Occupancy Certificate are exempt from GST.
- Commercial under-construction property attracts 12% GST, with input tax credit available to registered businesses.
- Separately billed parking and club membership charges can attract 18% GST.
- Mumbai stamp duty is 6% for male buyers and 5% for female buyers including the metro cess, charged on the higher of agreement value or ready reckoner value. Registration is 1% capped at ₹30,000 (IGR Maharashtra).
- MahaRERA delay remedy: interest at SBI MCLR plus 2% on amounts paid, or full refund with interest on exit, subject to permissible force majeure extensions.
- RERA requires 70% of buyer collections to be held in a project-specific escrow account, caps carpet area deviation at 3%, and imposes five-year structural defect liability.
- Interest paid during the pre-construction period is deductible in five equal instalments from the year of possession under Section 24(b) of the Income Tax Act.
- Of over 700 live South Mumbai listings tracked in May 2026, about 40% were ready or OC-received and about 60% under construction (Property Butler).
- The repo rate stood at 5.25% in 2026, with SBI home loans quoted from 7.25%, and ready reckoner rates frozen for FY 2026-27.
- Reported buyer preference: over 60% of new homebuyers opt for under-construction property.
Sources and references
- MahaRERA – Maharashtra Real Estate Regulatory Authority
- IGR Maharashtra – Department of Registration and Stamps
- CBIC – GST on real estate
- Income Tax Department – Section 24 deductions
- Property Butler – ready possession versus under construction in Mumbai 2026
- The Propertist – under construction versus ready to move flat, Mumbai 2026
- The Propertist – GST on under-construction flats in India 2026
- NoBroker – GST on property purchase, under construction versus ready to move
- Kalpataru – under-construction versus ready-to-move, carrying costs
- Mumbai Home Expert – GST on under-construction property in Mumbai
- Square Yards – Andheri East property rates
Disclaimer: The cost comparison on this page is an illustration built on stated assumptions, being a ₹2.05 crore ready price, a 17% discount, a three-year build, rent of ₹65,000 a month and market growth of 5% a year. Change any of those and the answer moves, in some cases substantially. It is not a forecast, not a valuation and not a recommendation about any project. Published estimates of the under-construction discount vary widely by source and micro-market, and several of the sources cited are developer or brokerage publications with a commercial interest, so we have given ranges rather than single numbers. GST rates, stamp duty and tax treatment under Section 24 were accurate for 2026 and can change with any Finance Act or notification. Verify project registration, committed dates and carpet areas on the MahaRERA portal, and take advice from a qualified chartered accountant and advocate before committing.
Looking at Andheri East?
153 East by Dasadia Developers LLP is a freehold residential development in J.B. Nagar, Andheri East, offering 1 to 4 BHK configurations close to the Aqua Line at Marol Naka, the Western Express Highway and both airport terminals. MahaRERA registration no. PR1180002502968, with registered carpet areas and project details verifiable on the MahaRERA portal. Ask us for the configuration sheet with RERA carpet areas, the payment schedule and indicative pricing, or book a site visit. Pricing is indicative and subject to change.
