CSI file is provided by the Income Tax Department through its web portal for validating the Payment Challans reported in the quarterly TDS / TCS Return. CSI File is mandatory to be downloaded from the portal and is supposed to be used at the time of generating the FVU file through the File Validation Utility.
Portal: https://www.incometax.gov.in/iec/foportal/
There are two different ways to download this file:
By logging into the portal with User ID & Password and downloading it from the appropriate section
Without logging in, one can click on the option ‘Download CSI File’ under ‘Quick Links’ and after entering the relevant information (TAN and Mobile number), an OTP is sent. After successful validation, follow the subsequent instructions and proceed to download the CSI File.
TDSMAN has made it convenient for its users to use any of the two options for seamlessly downloading the CSI file through the options as desired, for the successful generation of the FVU file through the File Validation Utility.
i have padi wrongly tds by selecting icnoe tax 2025 act letter on i have corrected the chalans but this file can not be selected for return uploading
This appears to be an issue related to the Income Tax Department portal. We suggest contacting the Income Tax Department helpdesk for assistance.
I am trying to file Q1 FY 202627. I have left over amount in challan of FY 202526. while downloading csi file, i am able to download csi for FY 202526 and FY 202627 separately. I am not able to select two csi files while preparing rpu/fpu. please advise how to go about
This may be an issue related to the change in the IT Act from 1st April ’26. You use the latest CSI file and go ahead and generate the Return which may come with a warning as it does not have the earlier challan. You may file this return – it should be processed without default if you have not over-used the old challan. However, please take further advise from the tax professional.