Inspired by this thread, I'm still trying to grapple with ROTH conversion strategies.
I'm not very experienced at Excel programming. But, I think
this entry over at the Bogleheads wiki describing a spreadsheet by
BigFoot48 provides a starting point for me. The spreadsheet doesn't properly model the tax situations that apply to me. But, BigFoot48 has done some admirable work and I think I can piggyback on it.
I'm sure no one would disagree that our tax laws are exceedingly complicated. As noted above by it's developer, i-orp ignores these complications when it gives its tax advise. The BigFoot48 spreadsheet does a better job of modeling the tax code. But, it's still a simplification.
I've been doing some trial runs through TurboTax. I want to see if there are any obvious short term actions that I should take. Further, I need to see what factors I should include in a long term model.
I made two statements above. First, that any extra income I realize beyond the top of the 15% bracket would be taxed at 30%. Second, that one should also consider state taxes. My short term conclusion is that, my statement about 30% is only partially true. Also, I should follow my own advice about state taxes.
Briefly, the way an extra dollar beyond the 15% bracket is taxed at 30% is that it pushes a dollar of Qualified Dividend from the special 0% treatment into 15% taxation. Plus, that dollar gets taxed at 15% as well. The way I was wrong about this is that I have foreign income in our taxable portfolio. I fill out the very non-intuitive Form 1116 to claim a Foreign Tax Credit. I can only claim part of the foreign taxes that our investments paid. If I increase our income by converting more ROTH, I can claim more.
Our state excludes $20,000 of retirement income (SS, Pension, ROTH conversion) per individual if over 55 ($24,000 if over 65). Then, there is a 4.63% flat tax.
Before reading this thread, I'd already made partial ROTH conversions for 2014. I used a strategy of converting up to the top of the 15% bracket. This was less than the $40,000 ($20,000 self + $20,000 spouse) that gets special state tax status. TurboTax tells me if I convert up to $40,000. The tax on the additional amount is ~25% Federal (because of the Foreign Tax Credit quirk) plus 0% state. If I delay, it'll be taxed at least 25% Federal + 4.63% state (SS will fill the state retirement income exclusion).
Bumping our conversions to $40,000 now seems to be a no brainer. Converting more may also make sense. OR planner makes a good point about this. I need to delve deeper to convince myself.
I tried to describe this a simply as I could. It still sounds complicated. This is just my situation. Everyone is going to have their own complications. IMHO, most tax strategy recommendations ignore these complications.