Tds on services received from abroad

Dear Experts

I need a small clarification on deduction of tds for  services received from abroad.

Our question is we have received  technical services from abroad. Under GST rules we have to pay IGST 18%.

Now the question of tds is whether I have to deduct tds including gst or excluding gst.

Please request the experts to guide me.

Thanks & Regards

S.Ramakrishnan