GST Network today said it has started the facility for registration of casual taxpayers -- those who conduct businesses occasionally. A casual taxpayer is a person who occasionally undertakes business transactions in a state/Union Territory where he/she has no place of business. Goods & Services Tax Network (GSTN) Chairman Navin Kumar said that the registration as 'casual taxpayer' will be valid for 90 days. A tax payer will also have the option to extend the registration duration once for a maximum of 90 days before the expiry of the initial period for which registration was granted. "A taxpayer must go for registration as casual taxpayer at least 5 working days prior to the commencement of business," Kumar said. Rather than registering as regular taxpayer and being required to file 'nil' returns during off- business months, casual taxpayers can enrol for a limited period of time, GSTN said in a statement. After a taxpayer