What is the brokerage, including STT and other taxes for buying 1 lot of GOLD GUINEA contract?

I know that the buy and sell brokerage will be double the value of buying.

Waned to know buy side brokerage and taxes details

You could just our brokerage calculator. 



You could use the Brokerage Calculator and do it your self by changing buy and the sell price respectively.. Commodity has Commodities Transaction Tax (CTT) not Securities Transaction Tax (STT), which is applicable on the sell side.

Example:

Buy Side: price 25000

  • Turnover 25000
  • Brokerage 2.50
  • Total Tran Charge 0.78
  • Service Tax 0.39
  • CTT 0.00
  • Education Cess 0.01
  • Higher Edu Cess 0.00
  • Total Tax and charges 3.68

 Sell Side: 25000

  • Turnover 25000
  • Brokerage 2.50
  • Total Tran Charge 0.78
  • Service Tax 0.39
  • CTT 3.00
  • Education Cess 0.01
  • Higher Edu Cess 0.00
  • Total Tax and charges 6.68

When used the same price the charge's are more as CTT is got added on the sell side rest everything remained the same.

Hope this clarified. :)