Ready-to-Move vs Under-Construction Flat: Cost, Risk and GST Compared

The price of an under-construction flat is usually lower than that of an identical ready one, and that gap is what attracts most buyers. But the lower price is only part of the story. When you add GST, the interest you pay before possession, the rent you may keep paying and the risk of delay, the picture can change.

This guide puts the two options side by side with a worked example.

In short: An under-construction flat has a lower sticker price but adds GST, pre-EMI interest, possibly rent and delay risk. A ready-to-move flat with a completion or occupancy certificate has no GST, no waiting and no construction risk, but costs more up front.

What each option means

• Ready-to-move: The building is complete and has received its completion or occupancy certificate from the local authority. You can inspect the actual flat and take possession after the sale is done.
• Under construction: The building is still being built. You pay in stages as work progresses, and possession is promised for a future date.

Be careful with "nearly ready" flats. A building that looks complete but has no occupancy certificate is still treated as under construction for most purposes, including GST.

1. GST

• Under-construction flat: GST is charged at 5% on most flats without input tax credit, and 1% for affordable housing as defined in the rules (we last checked a price cap of ₹45 lakh, plus carpet-area limits).
• Ready-to-move flat with a completion or occupancy certificate: no GST on the sale.

GST rules and definitions are set by the GST Council and can be revised, so confirm the latest position on the government's GST website before you decide. For the other taxes and charges, see the hidden costs of buying a flat.

2. A worked cost comparison

Suppose a ready flat costs ₹66 lakh, while the same flat in a project that will be finished in two years costs ₹60 lakh. Stamp duty and registration are similar on both, so we leave them out.

How we estimated pre-EMI: assume an 80% loan of ₹48 lakh at 8.5%, released evenly over two years, so that on average half the loan is outstanding, giving about ₹4.08 lakh of interest. In real life this depends on the builder's payment plan.

In this example, the "cheaper" flat becomes the more expensive one once GST, pre-EMI and rent are counted. The result changes with your numbers, such as the price gap, the construction time and whether you pay rent at all. If you are living in your own or a family home, the rent line disappears. That is why you should run the comparison for your own case.

3. Pre-EMI and the loan

For an under-construction flat, the bank releases money in stages. Until the final payment, you pay pre-EMI, which is interest only on the amount released. The principal does not fall, and full EMIs start only after the last instalment. Our EMI guide explains how EMIs are calculated.

For a ready flat, the loan is released at once and full EMIs begin straight away, but there is no overlap with rent.

4. Delay risk

Under construction. Projects can run late, sometimes by years. If the builder misses the date in the agreement:

• Under RERA, a buyer who stays in a registered project can claim interest for each month of delay, and a buyer who wants to leave can ask for a refund with interest, as per the Act and state rules.
• Meanwhile you keep paying rent and, often, pre-EMI.
• If the project stalls or the builder runs into financial trouble, recovering money can take a long time.

Ready-to-move. There is no construction risk. You can see the finished flat, test taps and fittings, check the view and talk to neighbours before you pay.

5. Quality and what you see

With a ready flat, you inspect the real thing. In an under-construction project, you rely on a model flat, a brochure and a promise. Check how much of the project has been built, and compare the specifications in the agreement with what is being delivered.

6. RERA protection

RERA is stronger for under-construction projects, as long as the project is registered. It gives you a public project page, a separate bank account for buyers' money, interest on delay and five years of structural defect liability. Ready buildings that already had their certificates are generally outside RERA's registration, which means more reliance on documents and approvals. See how to check a project on RERA.

7. Tax benefits and possession

Home loan tax deductions generally start when the house is complete and you take possession. Interest paid before completion can be claimed in five equal instalments after completion. A ready flat gets its first-year benefit sooner. See home loan tax benefits.

Which one should you choose?

Choose an under-construction flat if:

• you are not in a hurry and can wait without paying extra rent,
• the builder has a strong record of delivering on time,
• the project is registered with RERA and the price gap is large enough to cover GST and interest, and
• you like the flexibility of paying in stages.

Choose a ready-to-move flat if:

• you need to move in soon or are paying rent now,
• you want to inspect the actual home,
• you do not want construction or delay risk, or
• the GST saving and the avoided pre-EMI close most of the price gap.

Questions to ask for each option

For a ready flat: Is there an occupancy certificate? Are society dues clear? What are the maintenance charges? Is the carpet area what is in the agreement?

For an under-construction flat: What is the registered completion date? How is the payment schedule linked to construction? What is the builder's record on past projects? What happens if the date is missed? Our guide on checking a builder's track record can help.

Frequently asked questions

Is GST charged on a ready-to-move flat?

Not if the flat already has a completion or occupancy certificate at the time of sale. If the certificate has not been issued, GST can still apply, so check this before you pay.

Can I back out of an under-construction booking?

You can try, but the terms of the agreement for sale and RERA rules decide what you get back. Read the cancellation clause before you sign.

Does a lower price always mean a better deal?

No. Add GST, pre-EMI, rent and the risk of delay before comparing.

What happens if the builder delays possession?

For a registered project, RERA lets you claim interest for the delay or ask for a refund. File a complaint with the state RERA authority if needed, and keep copies of every payment and notice.

All figures are illustrations. GST rates and RERA rules differ and can change. This guide is general information, not legal, tax or financial advice.

Sources

• GST portal, Government of India
• Real Estate (Regulation and Development) Act, 2016, India Code
• Reserve Bank of India

• ready to move
• under construction
• GST on flats
• pre-EMI
• possession delay