The CBDT has further noted that many taxpayers are committing mistakes while furnishing their tax credit claims in the return of income. Such mistakes include quoting of invalid/incorrect TAN; quoting of only one TAN against more than one TAN tax credit; furnishing information in wrong TDS Schedules in the Return Form; furnishing wrong challan particulars in respect of Advance tax, Self-assessment tax payments etc. As a result of these mistakes, the tax credit cannot be allowed to the taxpayers while processing returns despite the tax credit being there in 26AS statement.