It appears that you should enter the tax withheld to date.
I find this very confusing. On the first screen it wants you to enter the expected total wages for the year, but the year-to-date withholding. That is not at all clear from the wording on the screen. On a much later screen, near the end, it specifically asks for "Salary Received to Date."
You might be better off using the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 form, and just skip or ignore the whole W-4 topic in TurboTax.
