Tds to be deducted under it & gst on a gst bill with example - clarification sought

In case we have a bill with a Basic Amount @ 47,584.00/-

Add: CGST (9%) + SGST (9%)  = 8,565.12/- ( @ 4282.56 each)

Total Bill after Tax = 56,149.12/-

Total Bill after Round off = 56,149/-

TDS under GST is to be deducted @ 1% of Basic Amount (47,584.00, i.e. 475.84) for both CGST & SGST each.

Under TDS for IT assuming the payment is to be made to a company - the deduction to contractor to be @ 2% of  56,149/-(Gross Bill) or 47,584/- (Net Bill)? 

Please provide the relevant circular if available or information source .