Regular assessment tax is calculated and becomes due during an assessment of your Income Tax Return after the last financial year has ended.
A self-assessment tax is one which is paid by an assessee in the same financial year after the end of which it will become due. It may be paid after Advance tax and other TDS dues have been accounted for and is a voluntary payment to the tax department.
In either case, you must use Challan 280 to make the payment.
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