Home Buyers · Decisions⚖️ Updated 10 Nov 2026 · ⏱ 11 min read
Under-Construction vs Ready-to-Move Which Flat Fits Your Money, Time and Risk?
One saves you money on paper; the other saves you years of waiting and worry. The right choice depends less on the market and more on your rent, your cash flow and how much delay you can absorb.
Quick Answer
A ready-to-move flat with an occupancy certificate has no GST, no delay risk and you see exactly what you buy, but it usually costs more. An under-construction flat is usually cheaper and lets you pay in stages, but carries 5% GST (1% affordable) and delay risk. RERA’s Section 18 gives you refund or interest if the builder is late.
At a Glance
GST, ready with OC:Nil
GST, under construction:5% (1% affordable)
Delay risk:Only under construction
Delay remedy:Section 18 refund/interest
Must check for ready:Occupancy certificate
Rent + EMI overlap:Under construction, often
Side by Side
Ready to move (with OC)
Under construction
Price
Usually higher
Usually lower, especially at launch
GST
None
5%, or 1% for affordable housing
Stamp duty
On the sale deed
On the agreement and/or sale deed, as per state law
What you see
The actual flat and finished common areas
A plan, a sample flat and a promise
Delay risk
None
Yes; Section 18 gives refund or interest
Payments
Down payment + loan at once
In stages linked to construction
Rent while you wait
None
Often rent + EMI or pre-EMI together
Choice of unit
What’s left
Widest choice at launch
Defect liability
5 years from possession (Sec 14(3))
5 years from possession
The Real Cost Comparison
A lower price can disappear once you add GST and the rent you keep paying while the flat is built. Here is a simple comparison for a buyer paying ₹25,000 a month in rent. The figures are illustrative.
Ready: ₹80 lakh
Under construction: ₹72 lakh
GST
₹0
₹3,60,000 (5%)
Rent while waiting
₹0
₹9,00,000 (36 months)
Pre-EMI interest on disbursed loan
₹0
Depends on the stage-wise loan; can be several lakh
Effective cost before loan EMIs
₹80 lakh
₹84.6 lakh + pre-EMI
Stamp duty and registration apply to both and are left out. If you already live with family and pay no rent, the under-construction option looks much better. If the project runs a year late, it looks worse.
The "Ready-to-Move" Trap: No Occupancy Certificate
Some flats are sold as "ready" or "possession in 30 days" without an occupancy certificate (OC). Legally, that flat is still under construction: GST may apply, and you may struggle with utilities, the home loan, insurance and resale. Ask for the OC before you call any flat ready, and check it on the municipal or authority site where possible. See OC vs CC vs completion certificate.
How RERA Protects Under-Construction Buyers
10% limit before the agreement
Section 13: no more than 10% of the cost before a registered agreement for sale. See booking amount rules.
Your money stays in the project
Section 4(2)(l)(D): 70% of buyer money goes into a separate account for that project’s land and construction.
Progress you can check
Section 11(1): quarterly progress on the RERA page. See how to read it.
Remedies for delay
Section 18: withdraw with refund and interest, or stay and get interest for each month of delay.
No changes without consent
Section 14(2): your flat’s plan needs your consent; the building’s needs two-thirds of buyers.
Tax: One Difference Worth Knowing
Under the old tax regime, interest on a home loan for a self-occupied home is deductible up to ₹2 lakh a year, but only once construction is complete. Interest paid during construction is allowed in five equal parts starting from the year of completion, within the same annual limit. With a ready flat, the deduction starts at once. The new tax regime does not allow this deduction for a self-occupied home. Tax law changes, so confirm with a tax adviser for your situation.
Which Suits You?
If this sounds like you
Lean towards
You pay high rent and need to move within a year
Ready to move
You can’t afford rent + EMI together
Ready to move
You live with family and can wait 3–4 years
Under construction
You want a specific floor, view or unit type
Under construction (early)
You want to see quality before paying
Ready to move
The builder has a strong on-time record in RERA
Under construction is lower risk
The project has missed progress reports or many complaints
Neither; look elsewhere
Frequently Asked Questions
Is it better to buy a ready-to-move or an under-construction flat?
It depends on your rent, cash flow and how long you can wait. A ready flat with an occupancy certificate has no GST and no delay risk but usually costs more. An under-construction flat is usually cheaper and payable in stages, but carries 5% GST (1% for affordable housing), rent-plus-EMI pressure and delay risk.
Is GST charged on ready-to-move flats?
No, if the flat has an occupancy or completion certificate before you buy it. GST applies only to under-construction flats: 5% for most and 1% for affordable housing (carpet area up to 60 sq m in metros or 90 sq m elsewhere, and price up to ₹45 lakh), without input tax credit. Resale flats carry no GST.
What are the risks of buying an under-construction flat?
Delay, changes to the plan or specifications, the builder running short of money, and paying rent and EMI together while you wait. RERA reduces these risks with the 70% project account, quarterly progress reporting, the 10% booking limit, consent rules for changes, and refund or interest for delay under Section 18.
Can I buy a ready flat without an occupancy certificate?
You can, but it is risky. Without an OC the flat is not legally fit to occupy, and you may face problems with utilities, home loans, insurance and resale, and GST may still apply. Ask for the OC before paying.
What is pre-EMI?
When a bank releases a home loan in stages for an under-construction flat, you pay only the interest on the amount disbursed until the full loan is released or construction completes. That interest is pre-EMI. It does not reduce your principal.
How does RERA protect under-construction buyers?
Through the 10% limit before a registered agreement (Section 13), the 70% project bank account (Section 4(2)(l)(D)), quarterly progress on the RERA website (Section 11), consent rules for plan changes (Section 14) and refund or delay interest if possession is late (Section 18).
Official Sources
Real Estate (Regulation and Development) Act 2016, Sections 4(2)(l)(D), 11(1), 13, 14 and 18. GST: Notification 03/2019-Central Tax (Rate); residential rates unchanged by the GST revision of 22 September 2025. Income-tax: deduction for interest on a self-occupied home loan under the old regime, with pre-construction interest in five instalments; confirm the current provision with a tax adviser.
Change Log
Nov 10, 2026: Page published.
Not Sure Which Project to Trust?
Project Check (₹4,999) reviews a shortlisted project’s RERA page, approvals, progress, complaints and the builder’s record, and sends you a written report personally reviewed before it goes out.