Payroll offices won't tell you how to fill out a w4. That's part of what we pay for in buying TT. And TT had been well known for its what-if tool, which took data from your returns, allowed you to adjust it to match up for what you had going on in the new year, and gave you an estimate on your taxes. And if you adjusted your withholding, it would recalculate. You would adjust until you got the results (tax due or refund) that you desired, and you would know what to do with your withholding by adjusting your w4 (and the state version). Supposedly TT still has this in the desktop version, but I can't find it.
