11. Refunds

(1) The assessing authority shall issue refund of amount specified in Form P-1 within ninety days from the date of service of the said Form, failing which the assessing authority shall also pay the interest at the rate prescribed under the Act along with such refund amount.

 (2) The dealer who claims refund due to sale effected by him under sub-section (1) of section 18 shall file an application in electronic Form W to the assessing authority along with copies of invoices or bills of related purchases within one hundred and eighty days from the date of 1[ making zero rate sale]. The assessing authority after verification of the correctness of the claim, shall issue refund within ninety days from the date of the receipt of the application in electronic Form W.