No Good Deed Goes Unpunished: What Really Happens When You Leave a 401(k) to Your Kids
Direct Answer: When you leave a traditional IRA or 401(k) to your children, the tax bill you deferred transfers with it. Under rules that took effect in 2020, most adult heirs have ten years to empty the account, and those ten years almost always land during their peak earning years. A disciplined heir spreading withdrawals evenly still pays a meaningful amount in taxes every year. An heir who takes it all at once, which roughly 40% do, can face a combined federal and state tax hit of 35 to 40% or more on money you spent a lifetime building.
There’s a saying that fits retirement planning better than almost anywhere else: no good deed goes unpunished.
You spent decades doing exactly what you were told. You saved. You maxed out the 401(k). You deferred the taxes and let the money grow. And now, as you’re thinking about what you’ll leave behind, here’s what nobody has told you yet.
The tax bill didn’t go away. You deferred it. And if you’re not around to pay it, your heirs are.
Deferred Doesn’t Mean Avoided
This is the piece most people never fully grasp about pre-tax retirement accounts. When you put money into a traditional 401(k) or IRA, you get a tax break today. But you make an unwritten agreement with the government: they will collect later. Not if. Later.
In retirement, that later is you. You pull the money out, it’s income, you pay the tax. That’s the deal.
But what happens when you pass away with a significant balance still sitting in those accounts? The agreement doesn’t expire. If you’re not there to pay it, your heirs are.
The Rules Got Worse
There used to be something called a stretch IRA. When you left a traditional IRA to your children, they could spread the withdrawals across their own life expectancy, often decades. That kept their annual taxable income manageable and gave them real flexibility.
The SECURE Act of 2019 eliminated the stretch IRA for most adult heirs. Today, your children have ten years to withdraw the entire balance.
That change, sold as a simplification, compressed decades of potential tax planning into a single decade. And those ten years almost always land right in the middle of your children’s peak earning years, when they’re already at or near the highest bracket of their lives.
What the Math Actually Looks Like
Say you leave your child a million dollars in a traditional IRA.
If they’re disciplined and spread withdrawals evenly over ten years, that’s roughly $100,000 a year coming out as taxable income, before accounting for growth still happening inside the account. At a combined federal and state rate somewhere in the 22 to 24% range, a real chunk leaves every year. The growth inside the account helps, but it also means larger distributions as the decade goes on.
Now consider what roughly 40% of heirs actually do, which is take most or all of it at once. If your child earns $200,000 a year and takes a million-dollar distribution in the same year, their income is $1.2 million. That lands at the top of the federal brackets, plus state taxes if applicable, plus potential exposure to additional taxes on other investment income in that same high-earning year.
When clients see that the inheritance they worked a lifetime to leave could face a combined 35 to 40% or more tax hit, the reaction is always the same. Shock. Then disbelief. Then: “Why didn’t anybody tell me this?”
I hear that a lot.
The Advisors Who Look the Other Way
Some advisors don’t bring this up. I suspect they’re hoping the issue never lands on their desk, or that the client won’t connect the dots. It will come up. It always does. The only question is whether you find out in time to do something about it, or after the options have closed.
My clients focus primarily on their retirement lifestyle, not on maximizing what they leave behind. That’s intentional. Lifestyle-first planning means the lifestyle comes first. But most of my clients still want to leave something real to their kids. When a large portion of their savings is in pre-tax accounts, part of my job is showing them what “leaving a million dollars” actually delivers after taxes, so they can decide whether they’re comfortable with that number.
Usually they’re not.
Two Kinds of Tax Problems
Here’s how I frame it. When you have a large balance in pre-tax retirement accounts, you have one of two kinds of tax problems.
The first kind is one you can still control. You have time before Required Minimum Distributions begin. There’s a window, often in your sixties, when income is temporarily lower and you can move money from pre-tax accounts into Roth. You pay the tax now, at rates you can see, on a schedule you choose. Money that comes out of a Roth has no RMDs, doesn’t feed the calculation that taxes your Social Security, and passes to your heirs without the income tax bill attached. For a full look at how to use that window, see Whose Tax Plan Are You On.
If you are weighing whether a conversion is actually worth it, not just in theory but in real dollars for your situation, see Will a Roth Conversion Actually Leave You With More Money? The Answer Almost No One Gives You.
The second kind is one you can’t control, because you already handed the timing to someone else.
Once RMDs are running, the government decides how much comes out each year. Frozen thresholds from 1984 and 1993 decide how much of your Social Security gets taxed. And when you pass away, the ten-year clock starts for your kids whether they’re ready for it or not. These forces don’t operate in isolation. They build on each other, and the Retirement Tax Avalanche walks through the full chain.
When you defer taxes into a pre-tax account, you’re not just postponing a bill. You’re signing a partnership agreement with the federal government, and your partner controls the schedule. They set the withdrawal rules. They write the tax brackets. They can change both, and they have been waiting a long time to collect.
And if one spouse passes away before the money is gone, the survivor faces those same distributions in single-filer brackets that are roughly half as wide. Less income, taxed harder. For a full look at how that plays out, see The Widow’s Tax Trap.
The Window, and What to Do With It
If you haven’t yet reached the age when Required Minimum Distributions begin, there may still be time to shift the picture before it’s set.
A well-timed Roth conversion strategy, run through the years between retirement and the start of RMDs, can meaningfully reduce what you’re leaving your kids to deal with. It isn’t free. Every conversion creates a real tax bill in the year it’s done. But it’s a bill you control: the rate, the timing, the amount. The alternative is leaving the full balance to compound in a pre-tax account until the government decides it’s time to take it out.
The right answer is different for every situation. Anyone who tells you otherwise isn’t giving you real planning. But the question of whether you still have a window, and how wide it is, is exactly what a Retirement Income Blueprint call is designed to answer.
Fifteen to thirty minutes, no cost, no obligation. You leave knowing where you stand.
Frequently Asked Questions
Under rules that took effect in 2020, most adult heirs must empty an inherited traditional IRA or 401(k) within ten years of the original owner’s death. The old stretch IRA, which allowed heirs to spread withdrawals across their own life expectancy, is gone for most people. Every dollar that comes out is ordinary taxable income in the year it is withdrawn, stacked on top of whatever else the heir earns that year.
It depends on how and when they take the distributions. A disciplined heir who spreads withdrawals evenly over ten years pays tax each year at their marginal rate on roughly a tenth of the balance plus any growth. An heir who takes the full amount in one year, which roughly 40% do, can face a combined federal and state tax rate of 35 to 40% or more on the entire balance if it pushes their income into the top brackets. For a detailed look at how heirs can navigate the ten-year window, see You Just Inherited an IRA.
The stretch IRA was a provision that allowed most heirs to spread inherited IRA withdrawals across their own life expectancy, often several decades. It kept annual taxable income manageable and gave heirs real flexibility. The SECURE Act of 2019 eliminated the stretch IRA for most non-spouse adult beneficiaries, replacing it with a mandatory ten-year withdrawal window. Congress characterized the change as a simplification, but the practical effect was to concentrate decades of potential tax planning into a single decade.
Yes, if the window is still open. A Roth conversion strategy, run during the lower-income years between retirement and the start of Required Minimum Distributions, moves money from pre-tax accounts into Roth accounts where it grows tax-free and passes to heirs without the income tax bill attached. Heirs still face the ten-year rule on an inherited Roth, but qualified distributions come out tax-free. For a full explanation of how Roth conversions work and when to do them, see Whose Tax Plan Are You On.
The inherited IRA tax problem is the final link in a longer chain. Required Minimum Distributions push income up, which triggers taxes on Social Security, which feeds Medicare surcharges, which compounds when a spouse dies and the survivor files single. The money that reaches your children is what remains after all of those forces have taken their share. For the full picture of how they connect, see the Retirement Tax Avalanche.
About Kurt H. Jackson
Experience: Kurt H. Jackson has spent more than 16 years working directly with retirees and pre-retirees in Missouri, Nebraska, Kansas, Iowa, and Florida. After the dot-com crash in 2003, he started reverse-engineering the traditional save-and-withdraw model, and what he found changed everything about how he approaches retirement income. Before founding KJ Financial, he spent 20+ years as a Certified Mortgage Planner working with more than 1,000 clients.
Expertise: Kurt is a Retirement Lifestyle Architect and the creator of the Lifestyle-First Retirement Income Planning framework. He is Life and Health Insurance Licensed in MO (8035802), NE, KS, IA (NPN 14954049), and FL (W192044). His practice focuses exclusively on insurance-based, tax-optimized retirement income strategies including Protected Lifetime Income (PLI) design, Roth conversion planning, and the Tax Avalanche. He does not manage investments or sell securities.
Authoritativeness: Kurt founded KJ Financial and operates MaxMyRetirementIncome.com as a dedicated educational resource for retirees. His Lifestyle-First framework is built on peer-reviewed research from Wade Pfau, Morningstar, BlackRock, and EBRI. Every income figure published on this site is based on actual carrier quotes and current research, updated regularly.
Trustworthiness: KJ Financial is a compliance-first firm. All income figures are presented as illustrative and hypothetical. Kurt H. Jackson is not a securities broker, registered investment advisor, or CPA. Guarantees rely on the claims-paying ability of the issuing insurance company.
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Educational only. Not tax, legal, or individualized investment advice. Tax rules are complex and change often, and every situation is different. Please work with a qualified tax professional before taking any action.