Step 4: The mismatch between TDS and/or TCS and/or Income Tax paid (Other than TDS / TCS) details provided in the ITR filed for the selected PAN and that reflected in Form 26AS is displayed. Learn how to fix TDS mismatch in your Form 26AS using ITR -U. Step-by-step guide in simple English for correcting tax details and filing updated returns. Learn how to rectify TDS mismatches in Form 16 and Form 26AS . Find the Common Errors and Reasons leading to TDS Mismatch . Visit now. Learn how to rectify TDS mismatch with Form 26AS and use ITR -U to file corrections. Follow our step-by-step guide for seamless tax filing.