Input credit understanding

Question - 1Hi. I am small retailor having turn over value of Rs. 8 Lacs engaged in business of Computer Sales, Peripheral, Spare parts etc. I have taken GST Provisional Registration Number. Since I am receiving all purchase items with 18% GST TAX AND When I will make sales to any company with Tax rate of 18% then company will able to take input tax credit of 18% on my sales? (I am not obtaining composition scheme. I will go for regular registration) Question – 2 As I am retailor then I will have to filled Business to Customer. Hence, Only HSN Code wise detail turn over shall be required to be furnished then how my sales to a company will be able to get tax input credit on my sales? Please advise.