No, that's not a bug in the system.
One reason is you may be subject to Alternative Minimum Tax (AMT). In calculating the AMT, you cannot take itemized deductions for state and local income tax, real estate taxes and personal property taxes, even though these are deductible on your regular return.
- AMT is calculated at the same time as your regular taxes. If the alternate method results in a higher tax, the difference between it and your regular tax is the AMT tax - the extra tax you'll pay.
- For additional information, see the TurboTax article, Alternative Minimum Tax: Common Questions.
There may be other reasons . Please see, Why didn't my refund change when I entered my mortgage interest and property (real estate) tax?
[Edited 3-11-2020|10:03 am PST]
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