Change of tax period notification requires Form DVAT 55 submission signed by the authorized signatory competent to sign returns. Intimation to change the tax period is made via Form DVAT 55 supplying the dealer's TIN, name, address, prior year turnover, existing and proposed tax periods, reasons for change, and must be signed by the authorized signatory competent to sign statutory returns; note is made of departmental notifications amending and later omitting the form.