Advance tax shortfall exceptions: certain income types exempt from Section 234C interest if tax is paid promptly. A shortfall in advance tax is ignored for calculating interest under Section 234C when it results from gains on transfer of capital assets, gambling winnings, first-time accrual of business or professional income, or dividend income, provided the tax for such income is paid in the remaining instalments immediately due after accrual or, if no instalment is due, before the end of the financial year.