How i can file service tax return if surrender registration

Sir as you are registered in any of existing law i.e VAT, Servise Tax or Exise you will have to mandatorily first take provisional registration in GST and Then file form GST REG 24 specifying that being turnover below 20 lacks you are not liable for registration in GST.

You shall file service tax return for April to Jun 17 on or before 15 August.

Thanks for your reply

Another clarity i required that still i have not surrender my Service Tax Registration, & I have only migrate to GST

So it is compulsory to Surrender in Service Tax or to fill GST REG 24 as prescribed by you.