Most people assume their tax bill will shrink in retirement, which was a safe assumption back in the earlier days of higher tax rates when the “traditional” 401(k) and IRA rose to prominence. Dreams of retirement have you picturing a slower pace, a simpler tax return, maybe even a lower tax bracket. After decades of diligent saving into a 401(k) or traditional IRA, you expect to finally reap the rewards of all that discipline.
And then you turn 73.
That's when required minimum distributions kick in, forcing retirees to withdraw money from pre-tax accounts whether they need it or not. For someone who spent 30 years maxing out their 401(k), those forced withdrawals can be substantial. On a $2 million pre-tax balance, the first year's RMD alone is roughly $75,000. The year after that, it's more. And every dollar counts as taxable income at ordinary income tax rates.
But the RMD itself is only the beginning. What catches people off guard is the cascade.
Why does your tax bill seem to go up when your income is supposed to go down?
It doesn't go down. That's the surprise. For disciplined savers with large pre-tax balances in retirement accounts, retirement income can actually exceed what they earned while working, at least on paper. Here's how the pieces stack up.
Required minimum distributions push your adjusted gross income higher than expected. That higher income makes up to 85% of your Social Security benefits taxable, income that might have been tax-free or only partially taxed at a lower AGI. And if your modified adjusted gross income crosses certain thresholds ($109,000 for single filers, $218,000 for married couples in 2026), Medicare hits you with IRMAA surcharges that can add hundreds of dollars per month to your premiums.
None of these things happen in isolation. Each one feeds the next. RMDs raise your income. Higher income taxes more of your Social Security. Both together can trigger IRMAA. A retiree who expected to pay less in taxes than they did while working finds themselves paying more, and feeling like the system punished them for saving responsibly.
Is there a way to avoid the RMD tax trap?
There is, but the window is narrower than most people realize. For many retirees, the years between when they stop working and when RMDs begin at 73 represent the lowest-tax period they will ever experience. Income drops because the paycheck stopped, but RMDs haven't started yet. Social Security may be delayed or just beginning. On paper, these can be surprisingly lean years from a tax standpoint.
This is the Roth conversion window. During those gap years, retirees can strategically convert portions of their pre-tax retirement accounts into Roth IRAs, paying ordinary income tax on the converted amount at what may be the lowest rate they'll see for the rest of their lives. The money then grows tax-free in the Roth, comes out tax-free in retirement, and is never subject to required minimum distributions.
The key is doing this deliberately and in measured amounts. Converting too much in a single year can push you into a higher bracket or trigger the very IRMAA surcharges you're trying to avoid. The sweet spot is filling up a lower tax bracket each year without spilling into the next one. It requires planning, but the payoff over a 20- or 30-year retirement can be significant.
What if you'd rather enjoy your money than convert it?
Here's the part that surprises people: spending your pre-tax retirement money in those early years is also a legitimate tax strategy. Financial planning culture tends to emphasize preservation, stretching every dollar as far as possible, making it last. But for someone sitting on a large pre-tax balance, spending from those accounts in the early retirement years, the travel years, the bucket list years, actually reduces the balance that will be subject to RMDs later.
A retiree who takes $60,000 from their traditional IRA at age 65 to fund a year of travel is paying tax on that withdrawal at today's rate, which may be far lower than the effective rate they'll face at 75 when RMDs, Social Security, and IRMAA are all stacking up. They got the trip and the tax savings. The person who white-knuckled their spending for a decade to "preserve" their balance may end up handing more of it to the IRS than they saved.
This is not a license to spend recklessly. It's a recognition that the instinct to hoard every dollar in retirement can actually backfire for people with substantial pre-tax savings.
How do you know if you're at risk?
The people most vulnerable to the retirement tax bomb share a few characteristics. They saved aggressively into pre-tax accounts throughout their careers. They have relatively little in Roth accounts, taxable brokerage accounts, or other after-tax savings. And they haven't thought much about where their retirement income will come from or how it will be taxed, because they assumed the hard part was accumulating the money in the first place.
If that sounds familiar, the good news is that this is a solvable problem. But it requires acting during the window when your tax rate is at its lowest, not after RMDs have already started and the cascade is underway. The difference between planning for this proactively and reacting to it after the fact can be tens of thousands of dollars over a retirement.
If you're within a decade of retirement, or recently retired and enjoying a few quiet tax years, now is the time to look at this. It's one of the most impactful conversations we have with clients, and it almost always starts the same way: "I had no idea this was coming." Let’s make a retirement tax plan so that you can find the balance of spending and conversions that works for you.