In case if you are registered under regular scheme of GST, you need to file GSTR - 3B on monthly basis. However, if you are registered under Quarterly return monthly payment scheme, you need to file GSTR - 3B on quarterly basis.
The due date of filing of GSTR - 3B in case of monthly filings is 20th of each month. In case of quarterly filing of GSTR - 3B, it can be 22nd or 24th of the month depending on the State or Union Territory in which you are registered.
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