In case of GTA, you can also refer to notification issued last month.
You can ask your GTA to issue tax invoice with 12% tax, in that case you will not have to pay tax under RCM.
However coming to your question, yes you have to pay tax under RCM. Tax can be paid at a single time while filing GST return.
Note that under GST there is no provision to pay tax for a single month. You can pay tax at any time, only thing is that at the time of filing return you should have enough cash in your electronic cash ledger to setoff you liabilities.
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