A $1 Million 401(k) In Retirement Can Still Cost You Six Figures Without These 5 Moves

A $1 million 401(k) balance puts you ahead of 95% of American savers. But a large balance creates five specific tax and administrative traps most people discover too late. Handling these correctly versus ignoring them can cost six figures over a 30-year retirement.

Start a Roth Conversion Ladder Before You Stop Working

Retirement drops your income, creating a narrow window before Required Minimum Distributions (RMDs) kick in at age 73 under the SECURE 2.0 Act. During those years, you can convert chunks of your traditional 401(k) to a Roth IRA while staying in lower tax brackets. Married filers converting $190,000 annually stay in the 22% bracket. Wait until RMDs force distributions, and you could land in the 24% or 32% bracket on income you never chose to take.

A $1 million balance generates roughly $40,000 in RMDs at 73. Add Social Security and pension income and you face bracket creep you cannot control. Start conversions in your early 60s and you control both the timing and the rate.

Check IRMAA Thresholds to Avoid Medicare Surcharges

Medicare premiums are not flat. Income exceeding $106,000 for individuals or $212,000 filing jointly in 2026 triggers Income-Related Monthly Adjustment Amounts, adding $2,000 to $5,000 annually to your costs. IRMAA looks back two years, so a large Roth conversion or capital gain in your early 60s can trigger surcharges at 65. Map your income for the two years before Medicare eligibility and avoid crossing thresholds unnecessarily.

Update Beneficiary Designations on Every Account

Beneficiary forms override your will. An outdated 401(k) listing an ex-spouse or old sibling designation pays out regardless of your estate plan. Non-spouse beneficiaries must drain inherited IRAs within 10 years under current rules, which can push them into higher brackets. Review every retirement account, IRA, and life insurance policy and confirm both primary and contingent beneficiaries match your current estate strategy.

Shift to Conservative Growth, Not All Bonds

With the Federal Funds Rate at 3.75% and the 10-year Treasury yielding 4.04%, bonds provide real income again. But a 30-year retirement still needs growth. Inflation running at 2.2% means a bond-only portfolio barely keeps pace. A 60/40 stock-to-bond split makes sense for early-60s retirees, shifting from growth stocks toward dividend payers and diversified index funds.

Map Out Your RMD Schedule Now

At 73, you withdraw roughly 3.8% of your balance. By 80, that climbs to 5.3%. Model your RMD amounts for the next 20 years, identify the years where distributions spike into higher brackets, then front-load Roth conversions or charitable contributions before those years arrive.