Rule 86B of GST rules

This query is respect to Rule 86B of CGST Rules. I have mainly 3 queries regarding Income Tax payment Point

1. Is company of firms Income tax paid is also considered or else only Director, Partner, Proprietor Income tax paid is considered??
2. Are TDS deducted and Advance Tax paid comes under the meaning of Income Tax paid?
3. If TDS is also considered as Income tax then if the person has paid TDS more than 1 lac but claimed the whole TDS as Income Tax refund then what?