Hi,
Hope you are doing well !
Please find below the responses:
1. It should be considered from date of transfer/date of registration. I understand that the property was sold in FY 2017-18. So, FY 2017-2018 should be considered as return filing for sale.
2. No, you have to show sale in FY 2017-18.
3. Yes, the payments made to builder before issue of allotment letter can also be indexed. However,in this regard, there can be various views. One view can be the date when the initial advance is given by the intended buyer. The other view can be taking the date when allotment letter is issued to the intended buyer after the project has been properly described.
4. Yes, you can if the loan is used entirely for the purpose of acquisition of concerned property then it can form part of purchase cost.But it is a debatable point and is subject to litigation, so your AO may not allow your claim and you will have to file an appeal. However,there are various case law in which interest on loan is allowed to treat as cost of acquisition.
Example : CIT Vs. K. Raja Gopala Rao (2001 252 ITR 459 Mad)
Thanks & Regards,
Payal Chhajed