In April 2026 a Bengaluru buyer stood in a finished flat she could move into next month and, the same afternoon, walked a show flat for a tower that would be ready in three years and cost noticeably less. The choice between them was not just about patience. A ready home carried no GST but a higher price, while the under construction one was cheaper but added a tax and a wait, along with the risk that the timeline could slip. Weighing ready to move against under construction is one of the first real decisions a buyer makes, and getting the trade offs straight saves both money and disappointment.

The short answer. A ready to move home with a completion certificate carries no GST but usually a higher price and immediate possession, while an under construction flat is typically cheaper and paid in stages but attracts GST and carries the risk of delay. The trade off worth knowing is that the lower base price of an under construction flat can outweigh the GST you pay on it, but only if the project is delivered on time, so the decision turns on price, tax, timing and your appetite for construction risk.

What is the core difference for a buyer?

The core difference is that a ready to move flat is a finished product you can occupy now, while an under construction flat is a promise of a home delivered later. With a ready home you see the actual flat, the light, the finish and the neighbourhood as they really are, and you take possession without a wait. With an under construction one you buy from a plan and a show flat, pay as construction progresses, and take possession when the building is complete. That difference in timing drives most of the other trade offs, the price, the tax and the risk. For a buyer, the choice is really between certainty now at a higher price, and a lower price with a wait and some risk. Neither is universally better, which is why the decision should rest on your own circumstances rather than a rule of thumb.

Because an under construction flat is a future delivery, the protections around it matter more. A registered project, a sound developer and a clear agreement are what turn the promise into a reasonable bet, which is why due diligence weighs heavier on the under construction side. A ready home, by contrast, lets you inspect the finish, test the water pressure and see how the light falls before you pay, which removes a whole layer of guesswork. This is why many first time buyers, who cannot easily absorb a delay, lean toward a ready home even at a premium, while buyers with time and a cushion often find the under construction discount worth the wait.

How does GST change the maths?

GST changes the maths because it applies to under construction flats but not to a completed home with a certificate. An under construction residential flat attracts GST, at a lower rate for affordable housing and a higher rate for other homes, in both cases without input tax credit, while a ready to move home that has its completion certificate falls outside GST altogether. On the face of it that favours the ready home, but the picture is not that simple, because under construction flats often carry a lower base price to begin with. A lower base price with GST added can still come out below a higher price with no GST, so the tax is one line in a larger sum rather than the whole story, and it should be read as such rather than as a reason to rule an option out. Our guide to GST on a flat purchase sets out the rates and how they apply in detail.

How do the two compare across the board?

Set side by side, the two options trade price and certainty against each other across several dimensions. The table below lays out the main differences so you can see where each option is stronger.

Reading the table as a whole shows there is no free lunch. The ready home charges a premium for certainty and immediacy, while the under construction one offers a discount in exchange for patience and a measure of risk, and the right choice depends on which of those you value more.

What are the risks and rewards of buying under construction?

The reward of buying under construction is the lower price and the chance that the home appreciates by the time it is ready, while the risk is delay and the uncertainty of a home that does not yet exist. A lower entry price and staged payments can make an under construction flat easier to fund, and buyers often value the wider choice of units early in a launch. Against that sits the real possibility of delay, and the fact that you are paying for and waiting on something you cannot yet use, sometimes while also paying rent. The protections of project registration exist precisely because of these risks, giving you a public timeline and a remedy if the builder overshoots it. A buyer comfortable with the wait, who has checked the developer and the registration, can capture the reward, while one who needs certainty may prefer to pay the premium for a ready home. Our guide to the occupancy and completion certificates covers the documents that confirm a home is genuinely ready.

How should you decide between them?

You should decide by weighing your need for certainty against your appetite for saving, within your own budget and timeline. If you need to move soon, want to avoid construction risk, or value seeing exactly what you are buying, a ready home earns its premium. If you can wait, want the lower price and staged payments, and are willing to do the due diligence, an under construction flat can be the better value. Run the full sum on each, the base price, the GST where it applies, the stamp duty and registration, and the cost of any rent you pay while you wait, so you compare the true all in cost rather than the headline price. A buyer who lays the two options side by side on their own numbers, rather than on a general belief that one is always better, makes the soundest choice for their situation. It helps to be honest with yourself about the wait, because a three year timeline can stretch, and the cost of paying rent and an EMI together over that period is easy to underestimate. Equally, if a ready flat in the right location is beyond your budget while an under construction one in the same area is within reach, the wait may simply be the price of buying where you want to live.

How do you compare the two, step by step?

Treat the comparison as a calculation you run on both options before you choose. These steps turn a vague preference into a clear decision based on real numbers.

1. Note the base price of a comparable flat in each option in the same area.
2. Add GST to the under construction price, at the rate that applies to it.
3. Add stamp duty and registration to both, since these apply either way.
4. Add the rent you would pay while waiting for an under construction flat.
5. Check the developer's track record and the project registration for the under construction one.
6. Weigh your need to move soon against the saving the under construction flat offers.
7. Choose the option whose true all in cost and timing suit your circumstances.

Run this on the specific flats you are weighing. A buyer comparing a ready home against a launch such as Casagrand Promenade at Yelahanka should price both on an all in basis, so the decision rests on the true cost and timing rather than on the sticker price alone.

Frequently asked questions

Is there GST on a ready to move flat?

No. A ready to move home that has its completion certificate falls outside GST, so no GST is payable, though you still pay stamp duty and registration. GST applies only to an under construction flat, at a lower rate for affordable housing and a higher rate for other homes, in both cases without input tax credit.

Is an under construction flat cheaper than a ready one?

An under construction flat usually carries a lower base price than a comparable ready home in the same area, and that discount can outweigh the GST added to it. Whether it is truly cheaper depends on the full sum, the base price, the GST, the other charges and any rent you pay while you wait for possession.

What are the risks of buying under construction?

The main risks are delay and paying for a home you cannot yet use, sometimes while also paying rent. Project registration reduces these risks by giving you a public timeline and a remedy if the builder overshoots it, so checking the registration and the developer's track record is essential before you commit to an under construction flat.

Which is better, ready to move or under construction?

Neither is universally better. A ready home suits a buyer who needs to move soon, wants to avoid construction risk, and values seeing the actual flat, while an under construction one suits a buyer who can wait, wants a lower price and is willing to do the due diligence. Compare both on a true all in cost basis for your own case.

The GST treatment and trade offs in this guide reflect how ready to move and under construction flats compare in 2026, summarised in this comparison of GST on under construction and ready to move flats. Because tax rates and rules are revised over time, always confirm the current GST position and run your own all in cost comparison before you commit.

Last updated 2026-08-13. PropNewz Team.