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As of 2009, the IRS requires that the following income classifications file taxes: single under age 65--$9,350; single 65 and over--$10,750; married filing jointly with both spouses under 65--$18,700; married filing separately at any age--$3,650; head of household under 65--$12,000; and head of household 65 and over--$13,400.
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