The ITR landscape includes seven different forms: ITR-1, ITR-2, ITR-3, ITR-4, ITR-5, ITR-6, and ITR-7. Each taxpayer is required to file their ITR on or before the specified due date. The choice of ITR form depends on factors such as the sources of income, the amount of income earned, and the taxpayer's category, which can include individuals, HUFs (Hindu Undivided Families), companies, and more.