In the United States, for tax year 2021, you generally have to file a federal income tax return if your gross income is at least the following amounts, depending on your filing status:
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Single: $12,550
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Head of Household: $18,800
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Married Filing Jointly: $25,100
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Married Filing Separately: $5 These figures may change annually, so it's important to check the most recent guidelines from the IRS.