Timely filing of income tax return prevents loss carryforward and penalties; reconcile TDS and ensure e verification. Precautions emphasize timely filing and electronic verification: file on or before the due date to preserve loss carryforwards and avoid interest and late filing fees; post the acknowledgement where e filing lacks digital signature or EVC. Taxpayers must reconcile Form 26AS, compile supporting documents, choose the correct return form, verify PAN and bank details, confirm income, deductions and tax computations, and review the Annual Information Statement before submission.