In the world of retirement planning, the Roth conversion has long been touted as a golden ticket to tax-free growth. But as financial advisor Wes Moss, CFP, recently revealed on The Clark Howard Podcast, the reality is far more nuanced. While the idea of locking in tax-free growth later in life is appealing, the math often doesn't add up, and the potential pitfalls are often overlooked. Moss's blunt assessment? The $12,000 tax bill that comes with Roth conversions is a deal-breaker for most retirees.
The problem lies in the marginal tax brackets. A married couple in the 24% bracket isn't paying 24% on their entire income. Instead, their first dollars get taxed at 10%, then 12%, then 22%, and only the top slice hits 24%. This means that the effective rate in the 24% bracket lands around 16% to 18%. When you add a Roth conversion to the mix, you're essentially paying the full 24% on every converted dollar, which can result in a hefty tax bill.
Consider the scenario Moss laid out. A retired couple converts $50,000 from a traditional IRA to fill up the 24% bracket. The IRS treats that conversion as ordinary income, resulting in a tax bill of roughly $12,000, due with next April's return. That $12,000 has to come from somewhere, and if it comes from the IRA itself, you've shrunk the asset you were trying to optimize. If it comes from a taxable brokerage account, you may trigger capital gains paying the bill on the conversion.
The Income Related Monthly Adjustment Amount (IRMAA) on Medicare premiums is another hidden pitfall. Once Required Minimum Distributions (RMDs) kick in at 73, or when a big Roth conversion spikes your reported income, your Medicare Part B and Part D premiums climb. The cruelest detail? You can't exactly plan for IRMAA because they're two years behind on what your income is going to be. You can only guess.
So, when do Roth conversions actually work? They only win when your future tax rate is meaningfully higher than today's. That depends on the gap between your current marginal bracket and your projected RMD-era bracket. If you're in the 12% bracket now and RMDs will push you into 22% or 24% later, a partial conversion can pencil out. But if you're already in the 24% or 32% bracket and your RMDs will land you in roughly the same place, you're prepaying tax for no benefit.
The current economic climate also plays a role. With the Federal Reserve cutting rates and 10-year Treasury yields on the rise, the 'tax-free growth' argument assumes a return spread that justifies the upfront cost. Lower bond yields stretch that payback window further out.
So, what's the takeaway? Before you sign on the dotted line, build all three buckets: after-tax brokerage, traditional pre-tax, and Roth. Tax diversification is key, and future you wants optionality on which spigot to open in any given year. Run the marginal versus effective math, and model IRMAA two years forward. Convert in small slices, filling the bottom of a bracket, not the top. Stop before you cross into a higher bracket or trigger an IRMAA tier.
In my opinion, the enthusiasm for Roth conversions is often misplaced. The strategy that built Howard's audience's wealth, contributing to Roth accounts during working years, differs from converting six figures in your 60s. The $12,000 example is the gap between those two ideas, and it's the gap most retirees only see after the check clears. This raises a deeper question: Are we being sold a bill of goods when it comes to retirement planning? Perhaps. But one thing is clear: the math behind Roth conversions is far from a no-brainer.
