Too much gross income from this or her income tax return, the normal closing of a tax year is extended by three years. What percentage of the taxpayer's gross income must be omitted from his or her income tax return in order for the closing year to be extended ? As part of your answer, explain exactly how this percentage is applied. Standard Deduction and Filing Requirements. (Obj. 6) For each of the following individuals, determine (1) their total standard deduction and (2) the amount of their gross income threshold (and unearned income threshold for dependents) they use to determine whether they must file an income tax return for 2015. Steve is 36 years old. His filing status is single and he has 20/20 vision. Maggie is a 70 years old widow. Her son claims her as a dependent. Maggie is permanently blind. Her gross income includes investment income, but no earned income. Same as in Part b., except that Maggie is not claimed a dependent on her son's return. Jeannie and Tom file a joint tax return. Jennie turned 65 on January 1, 2016' Tom turned 69 on March 8, 2016. Neither have any vision problems