Briefly mention the concept of Self-Assessment tax u/s 140A of the Income Tax Act 1961 and its components.

Self Assessment Tax u/s 140A of the Income Tax Act, 1961: Where any tax is payable on the basis of any return required to be furnished under section 139 of the Income tax Act, 1961, after taking into account: the amount of tax, if any, already paid under any provision of this Act; any tax deducted or collected at source; any relief of tax or deduction of tax claimed under section 90 or section 91 on account of tax paid in a country outside India; any relief of tax claimed under section 90A on account of tax paid in any specified territory outside India referred to in that section; and any tax credit claimed to be set off in accordance with the provisions of section 115JAA or section 115JD, the assessee shall be liable to pay such tax together with interest and fee payable under any provision of this Act for any delay in furnishing the return or any default or delay in payment of advance tax, before furnishing the return and the return shall be accompanied by proof of payment of such tax interest and fee. Where the amount paid by the assessee under this sub-section falls short of the aggregate of the tax interest and fee as aforesaid, the amount so paid shall first be adjusted towards the fee payable and thereafter towards the interest payable as aforesaid and the balance, if any, shall be adjusted towards the tax payable.