It Section 143 1

It just shows that your income tax return is free from any arithmetic error or incorrect claim apparent from any information in the return.
It section 143 1. A taxpayer will receive intimation under section 143 1 if any one of the below mentioned circumstances prevails. Intimation under section 143 1 is proof of processing of your income tax return. Section 143 1 a communication received u s 143 1 a is communication for proposed adjustment u s 143 1 a received from the income tax department.
Section 143 1 intimation has to be sent within one year from the end of the financial year in which return is being filed. This notice is issued for the following reasons. If an assessee had paid extra amount for taxation and ought to receive refund from the income tax department then he will receive intimation with refund amount specified on the intimation order.
Communication of proposed adjustment u s 143 1 a. For example if the returns for the financial year 2016 2017 has been filed in the month of july 2017 then the tax department can send the intimation any time before 31st march 2019. Notice u s 143 1 a is an intimation from the central processing centre cpc seeking clarification of the mismatch between the income and deduction when compared to form 16 form 16a or form 26as.