When the deadline approaches, even seasoned professionals make avoidable mistakes on their ITR. We see five recurring ones every year. First, ignoring Form 26AS and AIS reconciliation. Second, missing legitimate deductions under 80C, 80D and HRA. Third, choosing the wrong regime without comparing both. Fourth, forgetting capital gains on mutual fund switches. And fifth, late filing — which now blocks loss carry-forward and triggers interest. Treat your ITR like a financial statement: reconcile, plan, file early.