This means any money withheld for taxes from income you received or any estimated payments toward income tax that haven't already been entered.
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Usually amounts withheld will come from W-2 forms that employers provide. Other forms, 1099R for example, will also list amounts withheld. Turbotax asks for these as it goes through the various sources of income. This is a final question to make sure that all amounts withheld from every income form has been entered.