TurboTax calculates the tax from the IRS tax tables.
The tax tables gives a tax amount for a $25 or $50 range of taxable incomes.
For example, if you file Single, your tax liability is $15,024 for taxable income between $90,750 and $90,800.
The formula will give a number which can be off by a few dollars depending on where in the $50 range your actual taxable income is.
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