Required minimum distributions (RMDs) starting at age 73 on a $3 million 401(k) create a compounding tax collision: the initial $113,000 withdrawal grows to $131,600+ by age 75 while triggering Social Security taxation, Medicare IRMAA surcharges up to $12,710 annually, and an effective marginal tax rate near 40%, making the original 37-cent tax deduction during peak earning years cost significantly more on withdrawal.

Retirees with $3 million+ balances should use the gap years between age 65-67 retirement and age 73 RMD start to convert $200,000 annually to Roth accounts, eliminating roughly $1.2 million from the RMD base and reducing initial age-73 forced withdrawals by $45,000+ annually while avoiding future taxable events.

Have You read The New Report Shaking Up Retirement Plans? Americans are answering three questions and many are realizing they can retire earlier than expected.

You spent 30 years building a $3 million 401(k), but, at 73, the IRS will start dismantling it on its schedule. The forced withdrawals are called required minimum distributions, and at that balance, they create a tax collision that most high earners never modeled during the accumulation phase.

The IRS calculates your RMD by dividing your prior year-end balance by a life expectancy factor from the Uniform Lifetime Table. When you turn 73, that factor is 26.5. This means that on a $3 million balance, the math produces a first-year RMD of roughly $113,000.

The portfolio likely keeps growing. Assuming 6% annual growth, the balance climbs to roughly $3.18 million the following year. But the distribution factor also shrinks: at age 74, it is 25.5, pulling out approximately $124,700. At age 75 (factor 24.6), the RMD on a roughly $3.24 million balance reaches about $131,600. The withdrawals grow faster than most people expect, even as the portfolio holds its value.

Have You read The New Report Shaking Up Retirement Plans? Americans are answering three questions and many are realizing they can retire earlier than expected.

The real damage comes from what that $113,000 RMD lands on top of. Add a modest Social Security benefit and a small pension, and a single filer’s income can easily cross $170,000. While this falls in the 24% federal bracket (which, in 2026, caps at $201,775), the "hidden" costs are much higher.

First, 85% of Social Security benefits become taxable once combined income exceeds IRS thresholds. Second, IRMAA surcharges activate. IRMAA (Income-Related Monthly Adjustment Amount) is Medicare's income-based premium surcharge. It uses a two-year lookback, meaning your 2024 tax return determines your 2026 premiums.

For 2026, IRMAA surcharges begin at $109,000 for single filers and $218,000 for married filing jointly. A married couple whose combined income hits Tier 3 ($342,001 to $410,000) adds **$9,240 per year** in combined Part B and Part D surcharges. Cross into Tier 4 (above $410,000), and the penalty jumps to $12,710 annually for the couple.

Between the 24% bracket, the Social Security "tax on a tax," and the IRMAA "cliff," a retiree can face an effective marginal rate near 40% on those final RMD dollars. The 401(k) deduction that saved 37 cents on the dollar during peak earning years can actually cost significantly more on the way out.

SECURE 2.0 pushed the RMD start age to 73, with a further increase to 75 for those born in 1960 or later, effective 2033. That delay is valuable only if you use the gap years between retirement and RMD age strategically.

If you retire at 65 or 67, you have six to eight years where taxable income is lower than it has been in decades. Traditional 401(k) balances sit untouched, growing tax-deferred. This is the optimal window for Roth conversions: moving money from the traditional 401(k) into a Roth account, paying tax now at a lower rate, and permanently eliminating that balance from future RMD calculations.

Roth 401(k)s have no RMDs during the owner's lifetime under SECURE 2.0, effective beginning in 2024. Every dollar converted before 73 is a dollar that will never generate a forced taxable event. On a $3 million balance, converting $200,000 per year for six years during the gap eliminates roughly $1.2 million from the RMD base, reducing the age-73 RMD by more than $45,000 annually at the initial factor.

Calculate your projected age-73 RMD using the IRS Uniform Lifetime Table and your current balance grown at a conservative rate. Layer in Social Security, any pension income, and capital gains distributions to see which IRMAA tier you will land in. The 2026 standard Part B premium is $202.90 per month; the surcharge tiers above that can add hundreds more per person per month, and they are calculated from income two years prior, not the year you pay them.

Model Roth conversions in the gap years between retirement and age 73. The goal is to fill your current bracket without crossing into the next IRMAA tier. Converting to the top of the 24% bracket (up to $201,775 for single filers in 2026) while staying below the first IRMAA threshold is the most efficient conversion corridor for most people in this balance range.

If your projected combined retirement income exceeds $218,000 for a married couple, the tax planning alone justifies a fee-only advisor. The IRMAA two-year lookback means an ill-timed income spike, like a Roth conversion or a property sale, can trigger premium surcharges you must pay for 12 months, as the SSA rarely grants appeals for one-time gains. Getting that timing right is worth the cost of professional guidance.

You may think retirement is about picking the best stocks or ETFs and saving as much as possible, but you'd be wrong. After the release of a new retirement income report, wealthy Americans are rethinking their plans and realizing that even modest portfolios can be serious cash machines.

Many are even learning they can retire earlier than expected.

If you're thinking about retiring or know someone who is, take 5 minutes to learn more here.