Gopal,
If ur sales is below the exemption limit of VAT (as per ur state) than U needn't has to apply for vat, so in that case u willn't have any TIN no.
And If ur income is below the examption limit of compulsary maintainance of books than u can file ur return without maintaining books of accounts i.e. without bank a/c & registered firm.
So, if u fullfill the above mentioned both conditions than u can file ur iTR