Hi, Please find answers to your questions as per my opinion:
1.) Should I receive the brokerage amount in my Savings account or Current account? .. Any of them should be ok but sinch it is business income, it is better to receive in current account2.) If I get payment in current account, then would bank give us FIRC? Bank gives FIRC on request. You can check with your bank relationship manager before receiving payment
3.) What percentage of tax I have to pay? Since this will be construed as exports, GST will be NIL. However if the receipt amount is more than 20 Lakhs, you will have to register with GST, file LUT and file GST return showing this receipt as Zero Rated. Or pay GST and claim refund. Income tax will depend upon your total income, expenses, profit and slab applicable