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Re:FTC Is Investigating Intuit over TurboTax Practices by sokoloff on Tuesday September 08, 2020 @02:23PM (#24411249)
If your outside income is predictable and you prefer to do smooth withholding, you should be able to get quite close with W-4 excess withholding instructions.

I just try to make sure I hit the safe harbor withholding amounts every year (100% or 110% of last year's tax liability, depending on income level) and then otherwise just minimize withholdings.

Re:FTC Is Investigating Intuit over TurboTax Practices by vonmoltke on Tuesday September 08, 2020 @02:35PM (#24411408)
That's what I end up doing. The remaining difference is mostly from unpredictability.

Still, I'm trying to understand how a system like Ireland's, which from this description doesn't have anything like a W-4, works without being significantly off in many cases at the end of the year.