How do I determine how much I can roll over to just use up the $5,000? Also if I do it now it can only be for 2017 taxes, correct? Is there a limit to the amount I can rollover to my ROTH for the year? I think $151,900 is the next tax bracket. We pay slightly negative taxes and I don't want to accidentally create a big tax bill just one that is around $5,000. Does that make sense? Our effective federal tax rate was -1.49% last year.