Since I did not get any answer from the lawyers, I did some research on my own and formed a conclusion for myself (strictly my personal view point)
See the following link where Inspector General of Registration (IGR) has clarified :
https://www.deccanherald.com/content/381563/stamp-duty-benefit-apply-only.html
As per the above clarification :
- Builder should sell only the 'building' part separately
- Land Owner should sell only the 'Undivided Share' of the land separately
Only then, the reduced stamp duty is applicable on joint-development agreement.
If specific division of 'built-up' property (i.e., specific flat numbers) is mentioned in the agreement and it's brought up for registration, it will be deemed as sale conveyance and will attract normal stamp duty. i.e., actually the stamp duty will be calculated on the full built-up value (land + constructed value). It's worse than the situation where the builder buys and registers land directly.
It is exactly for this reason, the builder & land owners are not registering the sharing agreement.
But since the Government position is made clear, any one buying on the basis of 'non registered' sharing agreement: The document will not be accepted as evidence in court. It may not be an immediate concern, since it can be assumed that the land-owner & builder will not file cases against each other (since both will suffer) - This is true only if the sharing agreement is a genuine(and single) document. If either party tries to sell more flats by a fraudulent sharing agreement, that's another matter. We're talking of genuine sharing agreements in the current topic.
In most cases, the land is inherited, and hence the person is not an absolute owner in any case. He may be a Karta/Coparcener. The term land-owner is a misnomer.
Hence it is still possible that legal heirs/children/grand children of the Karta can file a case & bring the matter to dispute. At that point in time, the sharing agreement will be impounded until the required stamp duty is paid (and court imposed fine if any).
Who will pay the duty at that time ? It probably will be the flat owner (or the flat owners association), since the builder/Karta may not exist.