Hi Trico ,

Thank you for reaching out with your question about entering extra withholding on W4, line 4c. 

Your approach to input the additional withholding amount in the "additional withholding federal box/top line" and verifying its effect through a trial paycheck is correct. When additional withholding is specified on a W-4 form, it directly increases the amount of federal income tax withheld from each paycheck. This will indeed make the net check amount lower while increasing the FIT withheld, as you've observed. See this article for further details.

The system is designed to reflect this extra withholding in the overall tax calculations rather than showing it as a separate item on tax liability reports. As long as the net pay decreases and the FIT withheld increases in line with the additional amount entered, the system is functioning as intended.

If you have further concerns or need more detailed assistance, please don't hesitate to ask.

Warm Regards,
Erzsi

Hi Trico ,

Thank you for reaching out with your question about entering extra withholding on W4, line 4c. 

Your approach to input the additional withholding amount in the "additional withholding federal box/top line" and verifying its effect through a trial paycheck is correct. When additional withholding is specified on a W-4 form, it directly increases the amount of federal income tax withheld from each paycheck. This will indeed make the net check amount lower while increasing the FIT withheld, as you've observed. See this article for further details.

The system is designed to reflect this extra withholding in the overall tax calculations rather than showing it as a separate item on tax liability reports. As long as the net pay decreases and the FIT withheld increases in line with the additional amount entered, the system is functioning as intended.

If you have further concerns or need more detailed assistance, please don't hesitate to ask.

Warm Regards,
Erzsi