Required Minimum Distributions Are Coming for Your 401(k)

For 40 years, the IRS has been your silent partner in your 401(k) and Traditional IRA. You got a tax deduction upfront. Your money grew tax-deferred. And the government has been patiently waiting for its share.

Starting at age 73 — or 75 if you were born in 1960 or later — the patience ends. Required Minimum Distributions (RMDs) force you to withdraw a specific percentage of your pre-tax retirement accounts each year, whether you need the money or not. And for people who've built large pre-tax balances, the tax bill can be devastating.

What RMDs Actually Are

RMDs apply to Traditional IRAs, 401(k)s, 403(b)s, 457 plans, SEP IRAs, SIMPLE IRAs, and any other pre-tax retirement account. They do not apply to Roth IRAs during your lifetime — one of the Roth's most valuable features.

The calculation is straightforward: divide your account balance as of December 31 of the previous year by your life expectancy factor from the IRS Uniform Lifetime Table. At 73, the factor is 26.5. At 80, it's 20.2. At 90, it's 12.2.

The percentage of your portfolio you're forced to withdraw increases every year because your life expectancy factor decreases. At 73, you withdraw about 3.8% of your balance. At 80, it's about 5%. At 85, roughly 6.3%. At 90, over 8.2%. By your late 90s, you're withdrawing more than 15% annually.

The Math That Creates the Tax Bomb

Here's a concrete example that illustrates why this matters.

Consider a 73-year-old with $2 million in a Traditional IRA and $40,000 in annual Social Security benefits. Their first RMD is roughly $75,500. Combined with Social Security, their adjusted gross income hits about $115,500 — before any other income sources like pensions, rental income, or part-time work.

At that income level, a married couple is in the 22% marginal bracket. But here's the kicker: RMDs grow with age. By 80, assuming the portfolio has grown moderately to $2.3 million, the RMD is roughly $114,000. Combined with Social Security, AGI is now roughly $154,000 — still in the 22% bracket but pushing against the 24% threshold.

Now add a pension. If this retiree was a teacher, government employee, or corporate manager with a $40,000 annual pension, their AGI at 80 would be roughly $194,000 — solidly in the 24% bracket, and potentially triggering IRMAA surcharges on Medicare premiums.

And here's what makes this so frustrating: this retiree may not even need to spend $114,000. They might be comfortable on $80,000. But the IRS forces them to withdraw the full $114,000, pay tax on it, and then figure out what to do with the $34,000 they didn't want to withdraw in the first place. That leftover money goes into a taxable brokerage account, where its future growth will be subject to capital gains and dividend taxes — a second layer of taxation that could have been avoided with better planning.

IRMAA: The Hidden Tax on RMDs

IRMAA — the Income-Related Monthly Adjustment Amount — is a Medicare premium surcharge that kicks in when your modified adjusted gross income crosses certain thresholds. For 2025, the thresholds for a married couple are:

• $206,000: Part B premium increases from $185/month to $259/month; Part D adds $13.70/month
• $258,000: Part B increases to $369.90/month; Part D adds $35.30/month
• $322,000: Part B increases to $480.90/month; Part D adds $57.00/month
• $386,000: Part B increases to $591.90/month; Part D adds $78.60/month
• Above $750,000: Part B increases to $628.90/month; Part D adds $85.80/month

A couple with AGI of $300,000 — easily achievable with large RMDs plus Social Security and a pension — pays roughly $5,300 more per year in Medicare premiums than they would at the base rate. That's an effective additional tax of 3–5% on income above the IRMAA thresholds, layered on top of federal and state income taxes.

IRMAA is calculated based on your tax return from two years prior. So your 2026 tax return determines your 2028 Medicare premiums. This two-year lookback means you need to plan ahead — by the time you see the higher premiums, the income that triggered them is already two years in the past.

How to Defuse the Tax Bomb

The good news: RMDs are one of the few retirement problems you can solve before they happen. The bad news: you need to start early. Here are the most effective strategies.

Roth Conversions

The single most powerful tool for managing RMDs is converting Traditional IRA balances to Roth IRA in low-income years. Every dollar converted to Roth is a dollar that won't generate future RMDs, and the Roth account grows tax-free without any distribution requirements.

The strategy: identify years when your taxable income is lower than normal — early retirement before Social Security and RMDs start, a sabbatical, a year with large deductible expenses, or any period when your marginal rate is temporarily depressed. Convert up to the top of your current bracket, pay the tax at that relatively low rate, and shrink your future RMDs.

A retiree who converts $50,000 per year from age 60 to 70 at a 22% rate rather than letting that $500,000 compound inside a Traditional IRA and face RMDs at a 24% or higher rate saves tens of thousands in lifetime taxes. The math is similar to the Roth vs. Traditional decision — you're just making the conversion after the fact instead of at contribution time.

Qualified Charitable Distributions (QCDs)

Starting at age 70.5, you can direct up to $108,000 per year (indexed for inflation) from your IRA directly to qualified charities. These QCDs count toward your RMD but are excluded from your taxable income. They bypass AGI entirely, which means they don't trigger IRMAA surcharges or push you into higher brackets.

For charitably inclined retirees, QCDs are strictly better than withdrawing the RMD, paying tax on it, and then donating after-tax dollars. The QCD also allows you to itemize donations that would otherwise be limited as a percentage of your AGI.

Strategic Withdrawal Sequencing

The order in which you draw from accounts in early retirement matters enormously. Instead of following the conventional advice to spend taxable accounts first, then tax-deferred, then Roth, consider a more nuanced approach:

• In years when your taxable income is naturally low, withdraw from tax-deferred accounts to use up the lower brackets
• In years when RMDs will be large regardless, let tax-deferred accounts ride and spend from Roth or taxable accounts
• Use taxable accounts for large one-time expenses that would otherwise push withdrawals into higher brackets

The goal is to smooth your taxable income across retirement years rather than having it spike upward once RMDs begin. This is essentially bracket management at the retirement scale.

Spend Pre-Tax First in Early Retirement

If you're retiring early — before 65 or 70 — you have a window of years with no RMDs, no Social Security, and potentially very low taxable income. This is the ideal time to draw from Traditional IRAs and 401(k)s, even if you don't need the full amount, to reduce the balances that will eventually generate RMDs.

A couple retiring at 60 with $1.5 million in Traditional IRAs could withdraw $100,000 per year (standard deduction + 10% and 12% brackets) and pay an effective tax rate around 8–9%. By the time RMDs start at 73, the IRA balance might be down to $500,000 instead of $3 million, and RMDs would be a manageable $19,000 instead of $113,000. That's a fundamentally different retirement tax picture.

The Bottom Line

RMDs are the bill that comes due after 40 years of tax deferral. For most retirees, they're manageable — the percentages start low and increase gradually, and most people need to withdraw from their accounts anyway to cover living expenses.

But for high savers, dual-income couples with large 401(k) balances, and anyone with a pension filling the lower brackets, RMDs can create a tax trap that's both expensive and avoidable.

The solution isn't complicated: Roth conversions in low-income years, QCDs if you're charitably inclined, and thoughtful withdrawal sequencing. What's complicated is the procrastination. Every year you wait, the Traditional IRA balance grows larger, the future RMD gets bigger, and the tax bill compounds.

Start early. Convert strategically. And don't let the IRS's patience become your tax problem.