House property income

I believe that house property sold by you is a long term capital asset and also whole of the consideration was being received by you in 2016-17 only so you need to show the income from capital gains in current A.y 2017-18 only and not in the next A.Y.2018-19.
If you were unable to invest the entire Capital Gains on or before the due date of filing your return then the unutilized gains needs to be deposited in the capital gains account deposit scheme before the due date of your filing of return

I sold out my House property in Sept 16
& Capital Gain Rs. 7.90 lacs
part of that 5lacs I paid stamp duty of new purchase flat now around 3lacs with me
I not yet file my return as on till date for A.Y. 2017-18
Plz suggest what to do next

I sold out my House property in Sept 16 
& Capital Gain Rs. 7.90 lacs 
part of that 5lacs I paid stamp duty of new purchase flat now around 3lacs with me 
I not yet file my return as on till date for A.Y. 2017-18
Plz suggest what to do next

3 lacs will be your taxable capital gains for A.Y. 2017-18 tax @ 20% will be required to be paid