Roth vs. Traditional 401(k): The 2026 Framework
The 2026 SECURE 2.0 Roth catch-up mandate changes the math for earners above $150,000. Here is the decision framework with updated limits.
The Roth vs. traditional 401(k) question has been asked a million times. But in 2026, the answer changed for a significant group of workers. SECURE 2.0 Act Section 603 now requires that employees age 50 and older who earned more than $150,000 in prior-year FICA wages must make all catch-up contributions on a Roth (after-tax) basis. No exceptions. No opt-out.
That mandatory Roth provision, combined with updated contribution limits, means the old “it depends on your tax bracket” answer is no longer sufficient. Here is the framework that actually works for 2026.
The 2026 Contribution Limits
Before we get to the decision, here are the numbers. All figures are from IRS Notice 2025-XX and TSP Bulletin 25-3.
| Limit | 2026 Amount | Change vs. 2025 |
|---|---|---|
| Elective deferral (under 50) | $24,500 | +$1,000 |
| Age 50+ catch-up | $8,000 | +$500 |
| Ages 60-63 “super catch-up” (SECURE 2.0 Section 109) | $11,250 | New |
| Total deferral: under 50 | $24,500 | |
| Total deferral: age 50-59 or 64+ | $32,500 | |
| Total deferral: ages 60-63 | $35,750 | |
| Section 415(c) annual additions cap | $72,000 | +$3,000 |
| Compensation cap [401(a)(17)] | $360,000 | +$10,000 |
What Is the SECURE 2.0 Roth Catch-Up Mandate?
Starting January 1, 2026, IRS final regulations require the following:
- If you are age 50 or older AND earned more than $150,000 in FICA wages in the prior year, your catch-up contributions must be designated Roth. You cannot make them pre-tax.
- If you earned $150,000 or less, you retain the choice between pre-tax and Roth catch-up contributions.
- If your plan does not offer a Roth option, you cannot make catch-up contributions at all.
The $150,000 threshold is based on Social Security FICA wages from the prior calendar year, not total compensation. It does not index for inflation under the current statute.
This matters for the decision framework because high earners no longer have full flexibility over the tax treatment of their catch-up dollars.
The Decision Framework
We believe the Roth vs. traditional question comes down to three variables: your current marginal tax rate, your expected future tax rate, and your time horizon. Here is how they interact.
When Traditional (Pre-Tax) Likely Wins
| Situation | Why Pre-Tax |
|---|---|
| Current marginal rate above 32% and expected to drop in retirement | Deduction now at 32%+, withdrawal at 22-24% |
| Within 5-10 years of retirement | Less time for Roth tax-free growth to overcome the lost deduction |
| High state income tax now, planning to retire in a no-income-tax state (FL, TX) | Deduct at VA’s 5.75%, withdraw at 0% |
| Maxing out only the base $24,500 (no catch-up) | Full pre-tax flexibility preserved |
When Roth Likely Wins
| Situation | Why Roth |
|---|---|
| Current marginal rate at 22% or below | Small deduction lost, decades of tax-free growth gained |
| Early career (20+ years to retirement) | Compounding in a tax-free wrapper overwhelms the deduction value |
| Expect higher income or tax rates in retirement (pensions, rental income, RMDs) | Roth distributions do not increase your IRMAA premiums or trigger Social Security taxation |
| Over $150,000 FICA wages and age 50+ | Catch-up must be Roth anyway. May as well consider Roth for base deferrals too. |
The Tax Bracket Crossover
The most common mistake is assuming your tax rate will be lower in retirement. For many high-income professionals in Hampton Roads, particularly those with military pensions, federal civilian annuities, rental income, and required minimum distributions stacking on top of each other, the effective tax rate in retirement can match or exceed the working-years rate.
If you are a retired O-5 collecting $55,128 in military retired pay, drawing $30,000 from TSP, earning $80,000 from a defense contractor W-2, and receiving $12,000 in rental income, your combined AGI is $177,128. You are in the 22% federal bracket with Virginia’s flat 5.75% rate on top. Pre-tax 401(k) contributions at your contractor job make sense today, but the Roth calculus changes once you leave that W-2 and start drawing RMDs at 73.
What About the Super Catch-Up?
SECURE 2.0 Section 109 created an enhanced catch-up for employees ages 60 through 63. Instead of the standard $8,000 catch-up, eligible employees can contribute $11,250 in additional deferrals. That is $3,250 more per year during a four-year window.
If you earn over $150,000, that entire $11,250 must be Roth. Combined with the base $24,500, your total Roth deferral in those years is $35,750. Over four years (ages 60-63), that is $143,000 in Roth contributions.
In our view, the super catch-up window is the most powerful Roth accumulation opportunity in the tax code for employees in their early 60s.
What If Your Plan Does Not Offer Roth?
This is the quiet crisis in employer-sponsored plans. If your 401(k) or 403(b) does not offer a Roth contribution option, employees over 50 earning more than $150,000 cannot make catch-up contributions at all starting in 2026. The IRS final regulations provide a transition period through 2026 under a “reasonable, good-faith interpretation” standard, but plans must add Roth or forfeit catch-up eligibility for affected participants.
If your employer has not communicated changes to the plan, ask your HR department or benefits administrator directly. The question is simple: “Does our 401(k) plan offer designated Roth contributions?”
The Bottom Line
There is no universal answer. But there is a framework:
- Calculate your current marginal rate (federal + state combined).
- Estimate your retirement income stack (pension + Social Security + TSP/IRA RMDs + other income).
- Compare the two rates. If your retirement rate will be lower, lean pre-tax. If equal or higher, lean Roth.
- If you are over 50 and above $150,000, your catch-up is Roth regardless. Focus the decision on your base $24,500.
- If you are 60-63, maximize the super catch-up. This window closes at 64.
If you are unsure how to project your retirement income stack, that is exactly what a fee-only financial advisor does. The projection changes the answer for about half the people who ask.
Related reading:
- Roth vs. Traditional IRA: Which Is Right for You?
- How to Read Your 401(k) Statement
- What Is a Fee-Only Financial Advisor?
Ferrante Capital LLC is a registered investment adviser. Information presented is for educational purposes only and does not constitute investment advice, a solicitation, or a recommendation to buy or sell any security. All investing involves risk, including the possible loss of principal.
FC and its principals may hold positions in securities or asset classes discussed in this article. This analysis is for educational purposes only and does not constitute a recommendation to buy, sell, or hold any security.
Forward-looking statements reflect Ferrante Capital’s current analysis and involve assumptions and estimates. Actual results may differ materially. Past performance is not indicative of future results.
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