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Quick Answer. How much someone has to earn before being required to file a federal tax return depends on age and filing status, according to the IRS. For most taxpayers with a single filing status under 65 at the end of 2014, gross income must be at least $10,150. Continue Reading.
You must file a tax return if your net earnings from self-employment were $400 or more. So consider this: you may be 36 years old, single and make less than $10,000 per year in regular employment income, but if you have a side business that nets you more than $400, you will need to file a federal tax return.ust because they claim you as a dependent on their tax return doesnât mean you are automatically off the hook. If you are under age 65, are not blind and are claimed as a dependent on another taxpayerâs return, you will need to file if: 1  Your unearned income (money from dividends or interest) is more than $1,000.