ITC -reverse charge

Simmer Khanuja (6 Points)

15 August 2017  
hello
suppose we purchase 100000/- material on reverse charge mechanism in the month of Julyand we increase our tax liability by ₹18000(suppose gsr @ 18%)
Now my question is when we take it credit of ₹18000

1) we pay ₹18000 on due date for July say 10 aug and take ₹18000 ITC in the month of August.

OR

2). we increase our tax liability ₹18000 and club with other output liability and simultaneously increases our ITC and then adjust output liability with our ITC and pay difference in cash.