Ready-to-move vs under-construction: cost, risk and GST
Buying · 6 min read · Reviewed February 2026
A ready-to-move home with a completion or occupancy certificate is treated as an immovable property sale and attracts no GST; an under-construction purchase does attract GST, at concessional rates for affordable housing and a standard rate for other residential units, both without input tax credit. Under-construction stock is usually cheaper per square foot, but you carry possession-delay risk and may pay rent and EMI together.
The cost comparison people get wrong
Comparing sticker prices alone is misleading. On an under-construction flat, add GST on the purchase, the cost of paying rent while you wait, and interest on the disbursed portion of the loan during construction.
On a ready flat, add nothing for GST but check whether the price already reflects the premium builders and resellers charge for immediate possession.
What to verify in each case
For a completed property, the occupancy certificate is the document that makes it legally fit for occupation, and its absence is a serious red flag even if families already live there.
For an under-construction project, the RERA registration number, the registered completion date, and the escrow-linked payment schedule are the core checks.
- Ready: occupancy certificate, completion certificate, latest property tax receipt, society NOC.
- Under construction: RERA registration, approved plans, promised possession date on the RERA portal, construction-linked payment plan.
- Both: title chain, encumbrance certificate, approved layout.
Risk, in plain terms
The main risk in an under-construction purchase is time. Delay costs money you cannot recover through the sale price, and remedies through RERA take effort even when the law is on your side.
The main risk in a ready purchase is condition and title. What you see is what you buy, so a structural survey and a careful documents review carry more weight than any brochure.
Frequently asked questions
- Is GST payable on a ready-to-move flat?
- No. Once a completion or occupancy certificate has been issued, the sale is of immovable property and falls outside GST. GST applies only while the property is under construction.
- Why is under-construction cheaper?
- Because the buyer funds construction and carries the risk of delay. That discount is compensation for time and uncertainty, not free money.
- What if possession is delayed?
- The RERA-registered completion date is the reference point. Buyers can seek interest for the delay period or withdraw with a refund under the RERA framework, through the state authority.