tax liability

i have made govt work contract of rs 594000 and now i have received payment after deduction from 594000 ie. 2%tcs, 2% tds, 1% labour fund and 0.5% cess
now my doubt is i have to pay 12% gst on 594000 i.e aprox 72000
or on the amount of 
594000 - ( 12% of 594000) i.e. aprox 62000
please clear