After you have filed your income-tax return (ITR), you may have made some mistakes. According to the Income Tax (I-T) Act, of 1961, you have the right to revise your income tax return. Applications for revised income tax returns must be filed by December 31. Revision of past returns can correct mistakes, according to a tax expert. Describe your income level in terms of higher or lower. Revised returns can disclose any additional income not disclosed in the original returns. He can also deduct an additional amount from a tax-saving investment, claim a credit for donations not included in his tax return, or claim an additional tax deduction. http://saginfotech.wikidot.com/e-file-revised-itr-correct-mistakes