Hi,
To claim the exemption, one must invest the proceeds derived from the sale of the house property into another residential house
either within two years from the date of the sale or
one year prior to sale, or
one must invest in the construction of a new house within three years of the sale.
SO you have invested in the new house within one year prior to the sale you are eligible for the long term capital gain.
Just make sure while calculating capital gain you have calculated as below:
Indexed Cost of Acquisition = (Actual cost of purchase) * (CII Of Year of Sale)/(CII of Year of Purchase).
Indexed Cost of Improvement = (Actual cost of improvement) * (CII Of Year of Sale)/(CII of Year of cost of improvment).
Capital Gain = (Sale Price MINUS Indexed Cost of Acquisition MINUS Indexed Cost of Improvement).
Capital Gains Tax = 20% of Capital Gain