8 resources from incometax.gov.in we point founders to, and the questions each answers.
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The department's page on which return a proprietor or professional files: ITR-3 for regular business income, ITR-4 (Sugam) for presumptive income under 44AD, 44ADA or 44AE with total income up to ₹50 lakh, and who cannot use ITR-4.
The official manual for filing ITR-4 on the e-filing portal with pre-filled data, including prerequisites like a PAN linked to Aadhaar and a pre-validated bank account.
The portal where returns, audit reports and option forms are filed and verified; its notices carry the year's due-date extensions and the notifications issued under the Income-tax Act 2025.
The Income Tax Department's own calculator for working out tax under the old and new regimes for a given income, which is how to check the TDS line of any offer.
The department's own guide to which return form fits whom, including ITR-3 for individuals with business income and ITR-4 (Sugam) for individuals, HUFs and firms other than LLPs declaring presumptive income.