With tax day having just passed, there's been a good bit of Roth IRA-related content floating around. It's probably common knowledge how they work in terms of contributions being after tax and withdrawals being tax free and that assets in traditional IRA assets can be converted into Roth assets but you have to pay the tax to do conversions. Beyond those basics, there's a whole lot of nuance as well as subjective or mental accounting.
I've never been a huge fan of Roth conversions. The basic building block is that if your income is likely to be so much higher when you retire that it would push you into a higher tax bracket then converting to a Roth to avoid RMDs at that higher bracket makes sense. What is the likelihood that your income will be much higher after you retire? Unless my wife or I invent something or Bitcoin goes to $20 million, there's no reasonable scenario where our income goes up that much, paying tax now to do a conversion would not make sense for us.
How much is your Social Security scheduled to be? Ours would be $70,000 +/- in today's dollars. How big is your 401k likely to be? If you're 55 or 60 and still contributing a lot, your balance would probably more than double from here to age 75 if you need to start taking from it sooner. It probably would not triple, but it could. Will your 401k-rolledover-into-an-IRA be as large as $2.5 million? I'm pretty sure mine will not. At that level though, RMDs would run a little under $100,000 for a few years. At $1.5 million, you'd be just under $60,000 for the first few years.
Are you likely to have any other sources of income? I expect that by the time I'm mid-70's and need to think about RMDs, our rental income will go down, maybe from switching to long term renters. It would be less week to week work and whatever work there would be could be outsourced if we were so inclined. This would lower the rental income by 1/3-1/2. Will you have any earned income? I've said many times that I plan to still be active in my day job but there are some inevitabilities with regard to the age of most of my clients. I'd say about 1/4 of my clients, maybe a few more, are either just a little older than me or a little younger.
In today's dollars, the 22% tax bracket tops out at $206,700 and then the 24% bracket tops out at $394,600. A quick reminder, if your taxable income (not your gross, your taxable) is $210,700, you'd only pay 24% on that last $4000. You'd be paying an extra $80 in income tax above the 22% rate. And of course your effective rate would be lower than 22% or 24%. Based on the 2025 table, the first $23,850 after the $30000 standard deduction pays 10% (this is all married filing jointly), between $23,851 and $96,950 pays 12% and so on.
If you are firmly in the 22% bracket right now and convert $20,000, assuming that $20k wouldn't push you up to 24%, you'd pay an extra $4400 in taxes now. Unconverted, how much is that $20,000 likely to grow into and then what would 4% of that be for your RMD in your 70's and then inching up from there? Would this $20,000 triple over 20 years? Maybe, but even if it quadrupled to $80,000, the RMD would start at less than $3200. So pay $4400 now or $3200 in 20 years?
Clearly, converting at a very low effective tax rate makes plenty of sense. A simple scenario we've looked at before is someone who is 65, not working and not yet taking Social Security. In that scenario, a calculator from Equitable says the effective tax rate for $100,000 would be about 8%. Converting at that makes sense to me. Doing that five times before taking Social Security at 70 (if that's what you plan to do) would take a pretty good chunk out of most traditional IRA accounts, greatly reducing RMDs.
Part of the argument in favor of conversions comes from people like Ed Slott who believes tax rates have to go up because of our fiscal problems. He may be correct about what should happen but how likely is that to actually happen? If the TCJA cuts do sunset this year, the 22% and 24% brackets would revert to 25% and 28%. That would require some more number crunching and if somehow that would make it more compelling to convert, then by all means but how much would you "save" squeezing in a conversion this year?
There are plenty of scenarios where people will have higher incomes when they retire but that is not the majority. Crunch the numbers and do some reading. Based on what I know at this point about my particulars, it won't make sense to convert any assets.
It does make sense to make some contributions into Roth accounts along the way. I have about 20% of my retirement assets in a Roth. I've told this story 100 times but a client wanted to buy a new truck a few years ago for $40,000 and only had a traditional IRA. Because he took from that IRA, his $40,000 truck cost $50,000, the truck plus the taxes. If he had a Roth, his $40,000 truck would have cost $40,000.
If you think of RMDs as being like income, we've been paying tax on our income our entire lives. As a form of mental accounting, maybe that makes it easier to pay tax on that piece of money. It would be nice to not have to pay income tax to complete a large purchase like my client's truck.
One closing thought that I've never seen discussed anywhere and I've never thought about, but are you likely to inherit IRA assets from a parent? The ten year rule for taking it out is finally being enforced. You have to take it out in ten years. Taking it all in year ten is probably not a great idea for someone who is still working and assuming it's a bigger amount. I could see where it would make sense to use inherited IRA money to pay the tax on a series of Roth conversions.
Someone in the 22% bracket inherits $100,000 IRA from a parent. They take $20,000/yr, provided that doesn't kick them to a higher bracket, they withhold 22% which leaves them $15,600. That could cover the tax on a $70,000 conversion, again assuming the $70,000 doesn't kick them into a higher bracket and of course maybe between 22% up to 24% on the last few dollars doesn't matter to them? Doing this five times would reduce the amount subject to RMDs by a big chunk. There's also the assumption that this person can view the inherited IRA as found money that they don't need for their financial plan to work.
Again, I've never thought about that before but it's interesting. As with anything in this post, confirm with an accountant, I think I'm just asking the right questions.
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