Hi
I have few doubts related to RCM(tally )
1) I have raised the tax liability (RCM) 
By journal entries as by you 
I have raised journal as on 31/7/7 
Voucher having date31/7/17

2) as for GSTR-3B I WILL HV TO FIRST CREATE AND pay challan for RCM  and GST PAYABLE (IF ANY) 

3) As I will be making payment on 17/08/17 I will pass the entry in tally on 17/08 to credit bank and debit output tax accounts

4)Then after the above entry I will pass the journal entry to debit input tax ledger and increase my ITC

Sir now my question is when can I claim the above ITC(RCM)in the return for July or the return for AUGUST 

SIR PLZ CORRECT ME IF THERE IS ANYTHING WRONG IN THE ABOVE ENTRIES