what is due date for payment of service tax under GST.

I am carrying of retail cloth business and unregistered dealer under earlier law (i.e. VAT & excise) bcz cloth was exmpted goods in the previous law. Now under GST cloth is taxable goods. Our Annual turnover 40.00 lakhs (Approx). All the stock as on the appointed day is purchased from Unregistered dealer. Stock held as on 30/06/2017 included purchases from outside state & unregistered dealer.
My Q. is-
1) Can I opt. composition scheme under GST?
2) Declaration of closing stock as on 30/06/2017 is mandatory for me particularly if I am not interest to claim any input tax credit under GST on closing stock held on 30/06/2017.
3) If yes, then in which format.
4) if i want to go for composition scheme, then first to pay tax on the basis of reverse charge on our stock, or is there any specific expemtions to new registration made on the appointed date?

Sir my products are under 18% and 28%. I have to raise the Invoice separately for both slab rates Or can I mention in one invoice..? for state sales

create short and excess ledger -under indirect expenses but while making rounding of sales ,
it do not appear in ledger but while making journal entry of purchase and expenses it appear , how to make rounding of sales

I had my service tax regn at Thane, Maharashtra. I sold my flat (Business premises) and surrendered ST Regn in Sept 2016 as I was not getting any consultancy jobs. I moved to Bengaluru. Now few agencies are seeking my consultancy. With GST Threshold being Rs 20 lakhs can I take up consultancy without GST regn

In the form ITR 4 column TDS2 a new field has been added "details of receipt as mentioned in form 26AS " what should be filled in this?

whether RCM on reimbursement of expenses applicable also, if electricity charges reimbursement of RS. 15000/- to an individual by company .

Sir ,

My question is our unit is partnership firm and paid to rent 100000/- rs
landlord is not registered in gst so we are pay to reversed charge in gst please reply fast

whether RCM on reimbursement of expenses applicable also, if electricity charges reimbursement of RS. 15000/- to an individual by company .

Sir in odisha Regulated Market Committees are collecting market fees @1% from traders on trading of agricultural produces. But after implementation of GST they are dening for payment of such market fees showing that agricultural produces are exempted from GST. Is Market fees on agricultural produces shall be ceased after GST or not. If not is there any circular to this effect to show them.