Extra witholding from main job for supplemental job: included already in W-2 or need to be specified in "federal estimated tax" payment section?

[alkramer10]

I instructed my employer to withhold additional income to cover estimated taxes on my supplemental self-employment income. These extra taxes are taken out every paycheck. Do I need to include these estimated tax payments on the TurboTax "how much did you pay in federal estimated taxes?" page or are they already factored into my W-2, which I already uploaded on the main income page?

[DoninGA]

No, you do Not enter the additional taxes withheld from your wages as estimated taxes paid.  The federal taxes withheld have already been reported from box 2 of your W-2 as a tax payment on your federal tax return Form 1040.

[Bsch4477]

There is a difference between tax withheld which is what is reflected on your W-2 and estimated tax paid which you send to the IRS, usually quarterly. So , no you didn’t pay estimated tax.