Do i need vat tin/cst no. for trading in vat exempted goods?

If you have a CST Registration, then you can reduce your purchase cost by opting for CST on purchase instead of UP VAT by giving C Form to the Supplier, if the items are not exempt in CST and/or UP.

If you have CST Registration, then you must have Guj VAT Regn also.

It is advisable to get both the 

Hello Mr. Nawal,

please ensure the goods are exempted in your state frthe kindly check with selling delears like up and other state also exempted. if exempted no statutory form required. if taxable then you have to pay tax accordingly or get the statutory forms from department. only register delears shall receive and submit the statutory forms.

any how you will be grow in furture by developing your business your gross sales and purchase will hit. for that purpose you can apply for the registration.

if the purchase and sales done is same state then you could consider for vat registration. in your case other state purchases happening and  it is complulsary to register. for example road permit / way bills will intrept your purchase and purchase returns.

Garlic and rice are exempted in your state. As stated you will effect purchases from outside your State. So find out if these goods are tax exempted there or not. It may be attracting CST in the selling State. You should also find out what is the limit of Turn-over for VAT registration in your state. If you exceed the turn-over limit it is mandatory to get registered. Goods now exempted may be subjected to tax in future. So explore these points.