In a Reddit post on the r/personalfinance forum, an important question came up. The poster said they earn $135,000 annually and work at a job that offers both a traditional 401(k) and a Roth 401(k). Their company matches contributions, but those matching funds do not vest for five years and are forfeited if the employee leaves before then. That poster expects to leave before the vesting window closes.
Their question was whether to invest in either of their workplace plans or to open a Roth IRA instead. A financial advisor who understands the details of their personal financial life and long-term goals is always the best resource for this kind of decision. Still, some general guidance can help frame the choice.
Roth 401(k) or traditional 401(k): how each one works
When choosing between a traditional and a Roth 401(k), understanding the tax treatment of each account is the essential starting point:
- A traditional 401(k) accepts pre-tax contributions, meaning you pay no income tax on money going in. Taxes are deferred until withdrawal, at which point distributions are taxed as ordinary income. The IRS also requires account holders to begin taking Required Minimum Distributions at age 73.
- A Roth 401(k) is funded with after-tax dollars, so there is no upfront tax break. The payoff comes later: qualified withdrawals are entirely tax-free. Roth 401(k) accounts are not subject to Required Minimum Distribution rules, and distributions do not count toward the income thresholds that can make Social Security benefits taxable.
The core decision comes down to taxes: now versus later. If your tax rate in retirement is likely to be higher than it is today, the Roth 401(k) wins by locking in today’s lower rate. If your rate is likely to be lower in retirement, the traditional 401(k) wins by deferring taxes until you are in a cheaper bracket.
| Contribution Pathway | Taxable Income Impact | Upfront Tax Savings (24% Bracket) | Long-Term Withdrawal Status |
|---|---|---|---|
| Traditional 401(k) | Reduces MAGI dollar-for-dollar | Up to $5,880 | Taxed as Ordinary Income |
| Roth 401(k) | No change to current MAGI | $0 | 100% Tax-Free |
The math on $135,000
A single filer earning $135,000 sits squarely in the 24% federal marginal tax bracket for 2026. After subtracting the $16,100 standard deduction, taxable income lands at roughly $118,900, well inside the 24% band that runs from $105,700 to $197,300 for single filers.
- Choosing a Traditional 401(k) and maximizing the $24,500 elective deferral immediately cuts taxable income by that amount, saving up to $5,880 in federal taxes at the 24% marginal rate. That freed-up cash can be redirected into a taxable brokerage account or a backdoor Roth IRA.
- Choosing the Roth 401(k) is a calculated bet that the effective tax rate in retirement will exceed 24%. That is an uncommon scenario unless the account holder expects substantial taxable income streams in retirement, such as income from real estate or a traditional pension.
By thinking carefully about when taxes are cheapest, a saver can choose the account that minimizes the total tax bill paid over a lifetime.
The advanced play: Mega Backdoor Roth and the 2026 Roth mandate
The new Roth catch-up mandate
A major SECURE 2.0 Act provision took effect on January 1, 2026. Any worker whose FICA wages exceeded $150,000 in the prior calendar year is now required to make all age-50-or-older catch-up contributions on a Roth (after-tax) basis. Workers whose current employer does not yet offer a Roth 401(k) option will be unable to make any workplace catch-up contributions at all until the plan is updated to support Roth. At $135,000 today, this rule does not yet apply, but it is worth understanding as income grows toward that threshold.
The Mega Backdoor Roth
Before abandoning a workplace plan in favor of an outside Roth IRA, it is worth reviewing the plan’s Summary Plan Description to see whether the employer allows after-tax contributions (separate from standard Roth deferrals) and in-service distributions. When both features are available, the Mega Backdoor Roth strategy lets high earners contribute well beyond the standard deferral ceiling and convert those funds into tax-free Roth growth. It remains one of the most underused wealth-building tools in corporate retirement plans.
2026 contribution limits at a glance
- Standard 401(k) deferral: $24,500 (up $1,000 from 2025)
- Standard IRA contribution: $7,500 (up $500 from 2025)
- Age 50+ catch-up (401(k)): $8,000
- Age 60 to 63 “super catch-up” (401(k)): $11,250
Workplace plan or an independent account?
The Reddit poster was skeptical of contributing to a workplace plan precisely because the matching funds would not vest before they expected to leave the job. That skepticism led them to consider opening a personal Roth IRA instead.
An independent account has genuine advantages. The saver controls the brokerage, avoids the logistical headache of rolling over an account after changing jobs, and gains access to a much broader universe of investment options than a typical 401(k) menu offers.
Even so, walking away from an employer match is almost never the right call, because a match is simply free money. The standard rule of thumb is to contribute at least enough to capture the full match before directing funds elsewhere. The poster does not expect to stay long enough to vest, but circumstances change. Staying longer than anticipated and forfeiting the match by choice would be an expensive mistake.
The downside risk of contributing enough to earn the match is small. In the worst case, the employee leaves early, rolls their own contributions into a Roth IRA, and leaves the unvested matching funds behind. In the best case, they stay, they vest, and the employer’s contributions add meaningfully to their retirement balance. Contributing the minimum needed to earn the full 4% match is a reasonable baseline in almost every scenario.
Ultimately, the right answer depends on individual goals and circumstances. A financial advisor can help sort through those details. For most people in this situation, participating in the workplace plan and selecting whichever option provides the greatest tax advantage is a sound starting point on the road to long-term financial security.
Editor’s note: This article was updated to reflect 2026 IRS contribution limits, including the $24,500 employee deferral cap (up $1,000 from 2025), the $7,500 IRA limit (up $500 from 2025), and the $16,100 standard deduction for single filers. Context was also added on the SECURE 2.0 Roth catch-up mandate that took effect January 1, 2026.
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