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March 23, 2024
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Our total adjusted income was $149K, prior to adding a 1099-INT statement valuing $648, we owed $3 in Fed income taxes, once I entered it, we suddenly owed $225 - why?

  • March 23, 2024
  • 2 replies
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Best answer by dmertz

The roughly 34% marginal tax rate is likely due to either the additional $648 of taxable income increasing the taxable amount of some other income such as Social Security benefits, the pushing of some amount of long-term capital gains or qualified dividends to be taxed at 15% instead of 0%, or to a decrease in some sort of tax credit caused by the increase in AGI.  You would have to examine your tax return side-by-side with and without the additional $648 to know what side-effect is the cause.

2 replies

March 23, 2024

When you entered the 1099-INT, your adjusted income increased by $648, so the total tax now is calculated from this higher value, and the tax bracket you are in is the percentage by which this increase is calculated.

dmertzAnswer
Employee
March 24, 2024

The roughly 34% marginal tax rate is likely due to either the additional $648 of taxable income increasing the taxable amount of some other income such as Social Security benefits, the pushing of some amount of long-term capital gains or qualified dividends to be taxed at 15% instead of 0%, or to a decrease in some sort of tax credit caused by the increase in AGI.  You would have to examine your tax return side-by-side with and without the additional $648 to know what side-effect is the cause.