on GTA

TDS on GTA applicable if payment is made 30000/- or more in single contract or 75000/- in one or more  throughout the year,  Rate is 1% for individual / HUF and 2% for others.

PAN card is mandatory, if declaration is furnished that the transporter did not owned more than TEN vehicles in any time in preceeding year or current year, then TDS should not be deducted if declaration is not furnished then, TDS should be deducted at the above specified rate.  

If a GTA provides the services to the businesses, recipient of services is required to pay GST under reverse charge.

No, you dont have to pay gst under reverse charge, because your recipent of service is liable to pay gst under reverse charge mechanism.