Where to fill amount of statutory expenses such as Professional Tax, Interest on taxes, late fees in GSTR-3B?

Dear Madam/Sir
if a registered dealer pays office rent to unregistered dealer amounting to Rs.10000/- P.M, in this case, provision of GSTexempt (i.e.18% Gst will not be paid on Rs.10000 per month) for supply received from unregistered dealers for less than rs.5000/- would apply or not.

Please resove this query asap.

My query is

For a Consultant (Individual) who earlier has no liability to register under Service Tax or any other laws . Only filed IT returns .
What date should be shown in gst application as date of commencement of business.
Registration under Voluntary basis selected.

Thank you

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Thankyou

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