SECURE Act Forces 10-Year Payout on Inherited 401(k)s, Risking 45% Tax Hit

Q: What one move can retirement savers make now to shield their children from a future inheritance 'tax bomb'?

The most effective move is to convert traditional pre-tax retirement savings, such as a traditional IRA or 401(k), into a Roth IRA during the parent’s lifetime. That works because the “tax bomb” is created when children inherit a traditional account and, under the SECURE Act, must usually drain it within 10 years. Those withdrawals are taxed as ordinary income, which can push heirs into higher federal and state tax brackets and, if they are 65 or older, trigger Medicare IRMAA surcharges. By contrast, inherited Roth IRA withdrawals are generally tax-free, even though the 10-year payout rule still applies. In practical terms, a Roth conversion means the original account owner pays the tax now, at their own rate, instead of leaving the tax bill to children later when they may be in peak earning years. That can be especially valuable if heirs are likely to have high salaries, large retirement balances of their own, or Medicare exposure. This is not automatic advice for everyone. Large conversions can raise the parent’s current tax bill and may affect their own Medicare premiums if they are already enrolled. The strongest approach is usually partial, multi-year Roth conversions, modeled with a CPA or fee-only planner to manage tax brackets and timing. For families worried about leaving heirs a large traditional retirement account, converting at least part of it to Roth is the clearest proactive step to reduce or eliminate a future inheritance tax shock.

Q: Beyond the 10-year rule, what hidden withdrawal mandate on inherited accounts could trigger a massive 25% penalty?

The hidden mandate is the requirement to take annual required minimum distributions, or RMDs, during years one through nine of the 10-year payout period when the original account owner died after starting their own RMDs. That rule is easy to miss because many heirs focus only on the SECURE Act’s 10-year deadline. But if the deceased had already reached their required beginning date, a non-spouse beneficiary generally must do both: take yearly inherited RMDs and fully empty the account by the end of year 10. If those annual withdrawals are missed, the IRS can impose a 25% excise tax on the amount that should have been withdrawn but was not. If corrected promptly, the penalty may be reduced to 10%, but the exposure is still significant. In the case described, because the mother had already begun RMDs, the daughter cannot simply wait until the final year. She must calculate and take annual inherited RMDs based on her life expectancy while also planning the broader withdrawal schedule to avoid a large taxable balance in year 10. The key trigger is whether the original owner died on or after their required beginning date. If they died before that date, annual RMDs during years one through nine generally are not required, though the account still must be emptied by year 10.

Q: How can a $90,000 annual withdrawal from an inherited IRA actually save you more in taxes than taking less?

Yes. A $90,000 annual withdrawal can lower your total tax bill because it spreads the inherited IRA income across 10 years instead of letting a much larger balance pile up for a costly final-year payout. Under the SECURE Act, this 58-year-old daughter must empty the inherited account within 10 years, and because her mother had already started RMDs, she also must take annual distributions in years one through nine. If she takes only the minimum each year, the account could still hold hundreds of thousands of dollars by year 10. That final forced withdrawal would be added to her salary and could push much of the money into higher federal brackets such as 32% or 35%, plus state tax and possibly the 3.8% net investment income tax. By contrast, withdrawing about $90,000 a year is a bracket-management strategy. If she earns about $130,000, that would put roughly $220,000 of income on her return before deductions—high, but often still within a more manageable marginal range than a giant year-10 lump sum. In other words, paying 22% to 24% on more dollars over time can be cheaper than paying 35% or more on a large block later. For older beneficiaries, this also helps control Medicare IRMAA surcharges, which are triggered by income cliffs and use a two-year lookback. The key is not that $90,000 is magically tax-favored; it is that a steady withdrawal plan can reduce bracket spikes, surcharge triggers, and the year-10 tax bomb.

1 articles · Updated · 24/7 Wall St. · Jul 2

$900,000 inherited 401(k)s left to most adult children now must be fully withdrawn within 10 years, turning what was once a decades-long “stretch” strategy into a compressed tax problem.
When the original owner had already started required minimum distributions, beneficiaries also must take annual withdrawals in years one through nine under IRS rules finalized in 2024, not wait until year 10.
A 58-year-old taking only minimum distributions could still face a year-10 balance above $700,000; added to a six-figure salary, that lump sum could fall largely into the 35% federal bracket and push total tax above 45% with state levies.
Spreading withdrawals more evenly—about $90,000 a year in the example—can keep a single filer with $130,000 of salary in the 24% marginal bracket, though retirees also risk Medicare IRMAA surcharges of $1,150 to $6,900 per person.
The report says beneficiaries should quickly move assets into an inherited 401(k) or IRA, avoid cashing out directly, and map a 10-year withdrawal plan around retirement, Social Security and any Roth conversions.