How can I download the CSI (Challan Status Inquiry) file?

You can download the CSI file from Tax Information Network page of the Income Tax Department.
To download the CSI file, perform the following actions:

1. 1. 1. Go to the Tax Information Network page of the Income Tax Department. Here is the link: 
         [https://tin.tin.nsdl.com/oltas/servlet/QueryTaxpayer]
      2. Click the TAN Based View tab. Challan Status Query for Tax Payer page opens. 
      3. In the Tax Deduction/Collection Account Number text box, type your TAN number.
      4. In the Challan Tender Date/Date of Deposit field, choose the From and To dates of the quarter for which you are filing the challan.
      5. In the text box appearing next to Enter text as in above image, type the captcha that appears above the text box. You can refresh the captcha if the displayed captcha is not clear for you.
      6. After the verification of entered details, the Download Challan file button is automatically enabled. Click the Download Challan file to download the CSI file.