Delayed payment of GST on RCM basis renting of property

This query is : Open

Dam Kour (Querist)
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11 May 2025 Hi,
We have missed paying GST on RCM liability on renting of commercial property. We could understand that the same has to be paid from tax period Oct'24. However, we have finished filing 3B return for Mar'25.
We are looking to pay the liability and interest now. Please advise how the same has to be paid? Is it ok to pay in Apr'25 GSTR 3B? And show break-up (month wise) on the tab which comes after making payment/set-off (before EVC)?
Also, whether self-invoice number to be added in GSTR 1 of Apr'25?
Would appreciate your response. Thanks in advance.