In the Joint Development Agreements(JDAs), the Long Term Capital Gain (LTCG) arises upon handing over the possession of your land for development by signing the irrevocable power of attorney and your share of the developed property is allocated in the JDA itself or an allocation agreement.
Initially you may sign a MoU/preliminary JDA and give power of attorney for the limited purpose of getting approvals from the local authorities for the development and construction and at this stage, the allocation of your share of developed property is not ascertained. At this stage, the possession is not passed on and hence there will not be any LTCG.
You may execute JDA, when the approvals are obtained. At this stage, you may allow possession to the developer to develop and construct by giving irrevocable PoA. Your allocation will also be certain and LTCG arises at this point.
Under the newly amended provisions, if you are waiting till the completion of the construction, your LTCG arises only in the year in which the constructed area is handed over to you.
You need to ensure that the JDAs are drafted suitably to take care of your tax liabilities. Normally, the JDAs with the individuals are one sided in favour of the developers. You may ensure that the draft agreements are duly vetted from tax and legal points of view by a CA as well as a lawyer.