Intimation u/s 143(1) is assessment of your tax return filied. Intimation shall also be sent to the assessee in a case where the loss declared in the return by the assessee is adjusted but no tax or interest is payable by, or no refund is due to, him.
No intimation under this sub-section shall be sent after the expiry of one year from the end of the financial year in which the return is made.
Where a return has been made under section 139, or in response to a notice under sub-section (1) of section 142, such return shall be processed in the following manner, namely:—
(a) the total income or loss shall be computed after making the following adjustments, namely:—
(i) any arithmetical error in the return; or
(ii) an incorrect claim, if such incorrect claim is apparent from any information in the return;
(b) the tax and interest, if any, shall be computed on the basis of the total income computed under clause (a);
(c) the sum payable by, or the amount of refund due to, the assessee shall be determined after adjustment of the tax and interest, if any, computed under clause
(b) by any tax deducted at source, any tax collected at source, any advance tax paid, any relief allowable under an agreement under section 90 or section 90A, or any relief allowable under section 91, any rebate allowable under Part A of Chapter VIII, any tax paid on self-assessment and any amount paid otherwise by way of tax or interest;
(d) an intimation shall be prepared or generated and sent to the assessee specifying the sum determined to be payable by, or the amount of refund due to, the assessee under clause (c); and
(e) the amount of refund due to the assessee in pursuance of the determination under clause (c) shall be granted to the assessee.