Clarification of Sec 54 of Capital Gain

arunvelani (Part Time Practice cum Full Time Job)   (83 Points)

23 February 2011  

Pl somebody tel me that if assess sold residenital Flat and invest fund in new resident flat.

How he can claim exemp u./s 54? is he can claim exmp. on the bases of allotment letter or it is necessary that purchase agreeement is required? 

if new Resi. Flat will sale with in 3 year then what?

and if sale of proceed of this new flat is invest in new resid flat then is he eligible of Sec 54 continue or eventhought he has to pay LTCG Tax?

Pl help me in this regards