Dear Sir,
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A.The commission income so earned is subjected to GST@18% and all the provisions of GST law is applicable accordingly.
B1. Income tax will be applicable on net profit after claiming all the related expenses for the same.
B2. TDS might be deducted on commission income.
You shall be able to claim credit of taxes paid in foreign. That is called Foreign tax credit.
You will have to file form 67 before filing of income tax return.
c. Under GST, you need to pay GST on reverse charge basis and claim ITC.
You need to issue an invoice to the company. If they are paying you a fixed amount and not paying GST in addition, you simply need to do reverse calculation of GST according to the amount so received.
Under Income tax, apart from tds, form 15CA & 15CB would be applicable subject to certain conditions.
We may assist you in entire procedure.
It is advisable to take a phone consultation for detailed discussion.