The Four-Year Window Gen X Is About to Miss

A Benefit That Expires On a Birthday

Congress does not often write a tax provision that applies to exactly four years of a person's life and then stops. It did here, and the result is the strangest retirement rule currently on the books.

For 2026, the elective deferral limit on a 401(k) is $24,500. If you're 50 or older, you can add a catch-up contribution of $8,000, for $32,500.

But if you turn 60, 61, 62, or 63 during the calendar year, the catch-up is roughly $11,250 instead. That's $35,750 total.

At 64, it reverts to $8,000.

Read that again, because it's not a typo and it's not a phase-out. A 63-year-old can contribute more than a 64-year-old. The provision, from the SECURE 2.0 Act, applies to a four-year band and then simply stops, which means a meaningful number of people will discover it exists in the year after they aged out of it.

Right now that band is the leading edge of Gen X. If you were born between roughly 1963 and 1966, this is your window, and it closes on a birthday rather than at a deadline you'd notice.

What the Window Is Worth

The extra $3,250 a year over the ordinary catch-up sounds modest. Four years of it is $13,000 of additional contributions.

Run it forward at 6 percent to age 70 and you're at roughly $18,000. Not life-changing. Worth having, and worth more than the effort required, which is one conversation with payroll.

The larger point is what it signals about the ten-year stretch you're in. These are the years when contributions do the most in absolute dollars, not because the returns are better but because the balance is finally large enough that percentages mean something. A 6 percent year on $500,000 is $30,000. The same year on $60,000 at 28 was $3,600.

Compound interest gets described as a young person's asset, and mathematically that's true. Practically, the dollars show up now.

The Rule That Took the Deduction Away

Here's the part that got almost no coverage relative to its effect on take-home pay.

As of January 1 of this year, if your Social Security wages from that employer in the prior year exceeded $145,000 as originally written and indexed upward since, your catch-up contribution must go into a Roth account. It cannot be pre-tax.

This was in SECURE 2.0 from the start, scheduled for 2024, delayed by the IRS to 2026, and finalized in regulations last September. The delay is why you may have heard about it, forgotten about it, and never heard that it actually arrived.

The practical consequence is a tax bill you didn't budget for. An $11,250 catch-up that was deductible last year isn't this year. At a 32 percent marginal rate, that's roughly $3,600 in federal tax you weren't paying before, plus state. Your gross contribution is unchanged; your take-home fell.

If you noticed your paycheck shrink in January and assumed it was withholding tables, this may be why.

Whether That's Actually Bad

Less than the framing suggests, and I say that as someone constitutionally suspicious of Congress redesigning retirement accounts.

A Roth contribution buys tax-free growth and tax-free withdrawals, and it isn't subject to required minimum distributions in the way a traditional balance is. For someone with a large traditional 401(k) already, and most people in this age band have exactly that, a slug of Roth money is genuinely useful. It gives you a bucket to draw from in a year when you want to control your taxable income, which matters more than people expect once Medicare premiums are means-tested through IRMAA.

The honest version: if you expect a materially lower tax rate in retirement, the mandatory Roth costs you something. If you expect a similar or higher rate, which is the reality for anyone with a pension, substantial traditional balances, or a spouse still working, it's a mild gift you didn't ask for.

What it definitely requires is a cash flow adjustment. Same contribution, higher tax, smaller check. Look at it before December rather than after.

The Trap in Smaller Plans

One consequence worth checking this week if you work somewhere small.

If your plan doesn't offer a Roth 401(k) option, and a fair number of small-employer plans still don't, then high earners subject to the mandatory Roth rule cannot make catch-up contributions at all. There's nowhere for the money to go.

The fix is administrative. Your plan sponsor adds a Roth feature, which most recordkeepers support and which costs the employer effectively nothing. But nobody will do it unless somebody asks, and the person who benefits from asking is you.

The Averages Are Lying To You

Every article in this genre cites an average 401(k) balance for people in their late fifties and early sixties, and the number lands somewhere around $245,000, which sounds survivable.

The median for that age group is closer to $88,000.

That gap is the whole story. A distribution where the mean is nearly three times the median is not describing a typical person, it's describing a small group of very large balances dragging the average upward. When you read that the average person your age has a quarter million saved and feel behind, understand that you're comparing yourself to an artifact of arithmetic.

It also means the honest planning question isn't "am I average." It's what the balance produces. At a 4 percent withdrawal rate, $250,000 generates $10,000 a year. That's a supplement to Social Security, not a retirement.

Gen X is also the first cohort arriving at this point largely without defined benefit pensions, having been the transition generation when employers shifted the entire investment risk onto employees and called it empowerment. The 401(k) was designed in 1978 as a supplement to a pension. It became the whole thing without anyone deciding that it should.

The Other Numbers for This Year

• 401(k) elective deferral: $24,500
• Catch-up, age 50 to 59 and 64-plus: $8,000
• Catch-up, ages 60 to 63: approximately $11,250
• IRA contribution: $7,500, with a $1,100 catch-up at 50-plus
• HSA, family coverage: a $1,000 catch-up at 55-plus, and the HSA remains the only account with a triple tax advantage. We made the longer argument in Your HSA Is the Best Retirement Account Nobody Talks About.

Note that the age-50 IRA catch-up is not indexed the way the 401(k) figure is, which is why it's stayed near a thousand dollars for two decades while everything else moved. Small, but it tells you which account Congress cares about.

Where the Fee Question Finally Matters

One more piece of arithmetic specific to this stage.

A 1 percent advisory fee on a $60,000 balance is $600. Annoying. On a $600,000 balance it's $6,000 a year, every year, whether the account went up or down.

This is the point where old 401(k)s from former employers, sitting in whatever default fund they landed in, are worth an afternoon. Consolidating into an IRA at a low-cost provider is mechanical and frequently cuts expense ratios by 50 to 80 basis points. On a mid-six-figure balance across fifteen years, that's real money, and it's the rare optimization that requires no market view whatsoever.

Two cautions before you roll anything over. If you might retire between 55 and 59, money left in a 401(k) at the employer you separated from can generally be withdrawn without the 10 percent early penalty under the rule of 55, and rolling it to an IRA forfeits that. And 401(k) assets carry stronger federal creditor protection than IRAs in most states.

Check the window, ask payroll about the Roth requirement, look at the fees on the accounts you forgot about. Three tasks, one afternoon, and two of them expire.

For where to consolidate, see Fidelity vs. Vanguard, Fidelity vs. Schwab, and Schwab vs. Vanguard.