An income tax return is a form where taxpayers declare their taxable income, deductions, and tax payments. This procedure of filing income tax returns is referred to as income tax filing. While filing the actuals, the total amount that should go to the government as income tax is calculated. If you've paid more tax than needed for the financial year, you'll be refunded by the income tax department. Sometimes, you may also see that you have underpaid taxes for the year. In such cases, you must pay the remainder of the tax, and file your income tax returns.
Income tax return form ranges from ITR 1 to ITR 7, used for different types of income. Some income tax return forms are longer than the others, and they may need additional disclosures such balance sheet and a profit and loss statement information.
Also note that the deadline for e-filing your income tax returns for assessment year 2017-2018 is on or before July 31, 2017