I'm using Home & Business 2018 and creating an extremely simple return simply to test this issue because I'm seeing the same thing with other more complicated returns and I wanted to isolate the issue.
I created a test return for a person who is 73 and married but filing separately.
I put 50,000 in as income. She gets the standard deduction of 13,300 thus making her taxable income $36,700.
However, TurboTax is calculating the total tan on $36,700 of standard income as $4,217.
According to my calculations against the tax worksheet, the taxes should be $4214.
Additionally, the following two websites also show it as $4214:
https://www.taxact.com/tools/tax-bracket-calculator
https://www.hrblock.com/tax-calculator/#/en/te/results
But, TurboTax as well as Intuit's TaxCaster (https://turbotax.intuit.com/tax-tools/calculators/taxcaster/) continue to show $4217.
This should be the most simplest of calculations, but I can't find anything in any of the supporting worksheets. The 1040 Worksheet states it is using the "tax table", but there is nowhere that TurboTax is "showing its work."
Why it TurboTax trying to make me overpay?
As a further example, if I have $600,000 of income the amount it calculates in tax is $186,769 instead of $182,768, a difference here of $4,000!!
It seems something is critically broken in the internal tax tables.
