The Tax Bomb You're Inheriting
A quiet 2020 law turned inherited retirement accounts into a 10-year tax bill, landing in your highest-earning decade.
For forty years, the advice to your parents never changed: put money in the 401(k), let it grow untaxed, and one day pass it down. The retirement account was supposed to be the clean inheritance, the reward for a lifetime of saving, handed to you intact.
In 2020, a law called the SECURE Act quietly rewrote the ending. The account still passes to you. But the tax bill that rides along with it now lands in your peak-earning years, when the tax on it bites hardest.
The Stretch
Before 2020, inheriting a parent's 401(k) came with a quiet gift: the stretch.
When you inherited a retirement account, you could stretch the withdrawals across your entire life expectancy, pulling out a little each year, often for thirty or forty years, while the rest kept compounding untaxed. A thirty-year-old who inherited $2M might take a few thousand dollars a year, mostly in low tax brackets, and let the account grow quietly for decades.
The SECURE Act killed the stretch for almost everyone who isn't a spouse. In its place came the 10-year rule: the entire account has to be emptied within ten years of the original owner's death.
Every dollar that comes out of a traditional 401(k) is taxed as ordinary income, the same rate as your paycheck. The stretch let you spread that income thin. The 10-year rule forces it out fast, into a decade when your paycheck is already large.
Meet Emily
Take Emily, a senior software engineer at Apple. She's an ICT4 on the company's ladder, a role that according to levels.fyi pays a median of about $343,000: roughly $216K in base salary, $114K in stock, the rest in bonus. Call it $320,000 of ordinary income in a typical year. Comfortable, and firmly inside the 35% federal bracket.
Then her mother passes away and leaves her a 401(k): $2,000,000, a lifetime of careful saving. Under the 10-year rule, Emily has to drain it by the end of year ten, and the smartest thing she can do is spread the withdrawals evenly, about $200,000 a year.
The Stack
The inherited dollars don't get their own fresh, low tax brackets. They land on top of the income you already earn.
Income tax is charged in layers. Your first dollars are taxed lightly; each higher layer is taxed more. By the time you've earned your full salary, you've already climbed into the upper brackets. A forced 401(k) withdrawal stacks on top of all of it, so it's taxed at your highest rate, starting from the very first dollar.
One year of income
Two very different rates
Inherited 401(k), per year
$200,000
35% + 11.3%
Federal top bracket, plus California
Starts where your salary leaves off, so every dollar is at the top rate
Your salary
$320,000
up to 35%
Climbs through the brackets
Fills the lower rates before the inheritance even begins
The same $200,000 that might have been taxed gently in a retiree's hands gets taxed at the top of a working professional's stack.
The Bill
There's no version of this that's cheap. Every dollar of that $200K lands in her 35% federal bracket. Add California's income tax, north of 11% at her income, and she loses roughly 45 cents of every inherited dollar. Across the full $2M, that's about $900,000. Pull it as a lump, or hit a strong stock year, and the top dollars cross into the 37% federal bracket, pushing the combined rate past 50%.
The Fixes
The trap is real, but it isn't airtight. The best moves all happen before the account is ever inherited. Which is exactly why this is a conversation to have with your parents now, while it's still just awkward and not a tax return.
- Convert to a Roth before it's inherited. This is the big one. A parent can move money from their traditional 401(k) into a Roth, paying the tax now at their retirement bracket, usually far lower than your peak-earning one. You'd still empty it within ten years, but every dollar comes out completely tax-free, and it compounds tax-free the whole way. The bill gets paid once, by the person in the lower bracket.
- Split the account. A parent can name more than one beneficiary, several children or grandchildren. Each inherits a smaller slice that stacks on a smaller income, keeping more of it out of the top brackets.
- Aim for your lean years. A sabbatical, a stretch of grad school, a gap between jobs, an early-retirement year: any dip in income is a window to pull more out cheaply. The clock is rigid, but you choose the timing inside it.
The Move
A pre-tax retirement account was never pure wealth. It's wealth with a tax bill attached, and the SECURE Act decided who pays it, and when: you, in the years your income is highest.
Your parents spent a lifetime building that account, dollar by dollar. Your own success shouldn't be the reason nearly half of their life's work is handed back to the IRS for nothing.
Ask before you inherit.