Interest on excess tax payments: simple interest must be paid on amounts later found excessive until refund is granted. Insertion of subsection (3A) requires the Central Government to pay simple interest at the rate specified in sub-section (3) on amounts paid in excess pursuant to an assessment or penalty order and later found on appeal or other proceeding to be excessive, from the date of payment to the date of refund; interest is computed separately on instalments, is not payable for one month from the date of the order in appeal or other proceeding, and, where payable under this subsection, displaces interest under sub-section (3) for the same excess amount.