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question regarding W4
There are still ways that the default values on the W4 can lead you to get a refund or owe the IRS. If there was a big delta in your paychecks, it can lead to problems. If you make 260,000 and get 26 paychecks that means each check had a gross of 10,000. Your company will withhold the same amount from each check. But If you earned a big bonus then the smaller regular paychecks may not have been withholding enough.  When bonus checks are involved the payroll office has to treat them as irregular pay to be able to make it work out. Some companies don't do this, so you may under or over pay during the year. If you changed companies during the year, this can lead to under or over payment. The lower paying company would not know about the higher rate of pay at the other company. so at one you would under pay, and the other you would over pay. There are also social security issues with more than one employer.