Requires the commissioner of taxation and finance to provide for the payment by the department of taxation and finance of tax refunds within 30 days of the receipt of a taxpayer's tax return, unless there is a discrepancy in such return, in which case the department shall provide written notice to the taxpayer of such discrepancy and a date when the discrepancy will be resolved; provides failure to comply with such refund and notice requirement shall make the department of taxation and finance liable for interest on the refund due at a rate of 6% per annum.