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After-tax income, sometimes called post-tax dollars, is the amount of income you have left after federal income taxes (plus state and local income taxes, if they apply) have been withheld.
If you contribute to a nondeductible individual retirement account (IRA), a Roth IRA, or a 529 college savings plan, purchase an annuity, or invest in a taxable account, you are using after-tax income.
In contrast, if you contribute money to an employer sponsored retirement plan or flexible spending account, you are investing pretax income.
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