After the submission of your TDS return you have the option to evaluate your return by downloading the Justification report from the TRACES website.
This report lists out the following errors that was present in the returns that was submitted:
PAN Errors-List of all PANs that which is not present in the Income Tax Department data.
Late Payments-List of all those records whose TDS payments were deposited after the due date. An interest of 1.5% per month is charged on the TDS amount for the late payment.
Short Deduction – List of all the records in which the TDS deduction rate is less than the rate as per Income Tax Act.