For years, workers age 50 and older could make catch-up contributions to their 401k on a pre-tax basis, lowering their current taxable income. That changes in 2026. The SECURE 2.0 Act introduced a new requirement called the Roth catch-up rule.
Higher-income participants must now make these catch-up contributions as Roth (after-tax) contributions. This article explains the Roth catch-up rule in plain language: who it affects, how the income threshold works, the 2026 contribution limits, and what solo 401k owners specifically need to do to stay compliant.
What Is the Roth Catch-Up Rule?
The Roth catch-up rule is a provision of the SECURE 2.0 Act that requires certain participants age 50 and older to make their catch-up contributions as designated Roth contributions rather than pre-tax contributions. Catch-up contributions are extra dollars allowed for older workers beyond the standard 401k limit. They exist because lawmakers recognize that people nearing retirement often need to save more aggressively.
Here is the basic distinction. Pre-tax contributions lower your taxable income now, but you pay ordinary income tax on every dollar you withdraw later. Roth contributions give you no tax break today, but qualified withdrawals in retirement are completely tax-free. The Roth catch-up rule forces higher-income savers to take the Roth approach for their catch-up dollars.
The rule applies to 401k, 403b, and governmental 457b plans. It does not apply to SEP IRAs or SIMPLE IRA plans. For solo 401k owners, the Roth catch-up rule is relevant because a solo 401k is a type of 401k plan.
Who Does the Roth Catch-Up Rule Affect in 2026?
Two conditions must be met for the Roth catch-up rule to apply to you. First, you must be age 50 or older during the tax year. Second, your prior-year FICA wages from the employer sponsoring the plan must exceed the income threshold.
For 2026, the threshold is 150,000 dollars based on 2025 wages. This amount is indexed for inflation and increased from the original 145,000 dollar base. Only wages from the current employer sponsoring the plan count. Investment income, self-employment income from other businesses, and wages from previous employers do not factor into the calculation.
Here is an example. A consultant earns 160,000 dollars in W-2 wages from her S-corp in 2025. She turns 52 in 2026. Because her 2025 wages exceeded 150,000 dollars and she is over 50, any catch-up contribution she makes in 2026 must be a Roth contribution. She cannot make pre-tax catch-ups.
If that same consultant earned 130,000 dollars in 2025 wages, the Roth catch-up rule would not apply. She could choose between pre-tax or Roth for her catch-up contributions.
Who Is Exempt from the Roth Catch-Up Rule?
Several important exemptions exist under the final IRS regulations. Understanding these can save you from unnecessary compliance work.
Participants whose prior-year FICA wages were $150,000 or less are exempt. They can still choose pre-tax or Roth for catch-up contributions. The rule does not force them into Roth.
Participants with only self-employment income may be exempt. Sole proprietors and partners in a partnership do not receive FICA wages. The statutory language refers specifically to “wages” from an employer. Since they have no wages, many tax professionals interpret the Roth catch-up rule as not applying to them at all.
403(b) participants using the special 15-year catch-up can make those contributions as pre-tax regardless of income. This catch-up is available to employees who have at least 15 years of service with the same employer.
Governmental 457(b) participants using the special three-year catch-up before retirement are also exempt. This catch-up allows participants to double their contributions in the three years before their normal retirement age.
What If Your Plan Doesn’t Offer Roth Contributions?
This is a critical question for solo 401k owners. The IRS has made clear that if a plan does not offer Roth contributions, participants subject to the Roth catch-up rule cannot make catch-up contributions at all. The plan itself will not be penalized for excluding these participants from catch-up contributions. But the individual loses the ability to save that extra money entirely.
For example, a 55-year-old S-corp owner with 200,000 dollars in prior-year wages wants to make the 8,000 dollar catch-up contribution in 2026. His solo 401k plan document does not include a Roth feature. Because the plan offers no Roth option, he simply cannot make any catch-up contribution. He can still make his standard 24,500 dollar employee deferral as pre-tax, but that extra 8,000 dollars is gone.
Solo 401k owners who want to continue making catch-up contributions must ensure their plan document allows Roth deferrals and is properly administered. Not all solo 401k providers offer Roth features. Mainstream brokerage plans often do not. Self-directed plans like those from Nabers Group include full Roth options.
2026 Catch-Up Contribution Limits by Age
The 2026 contribution limits vary by age group. Here is a clear breakdown:
| Age Group | Base Deferral Limit | Catch-Up Limit | Total Employee Deferral |
|---|---|---|---|
| Under 50 | $24,500 | $0 | $24,500 |
| Age 50+ (standard) | $24,500 | $8,000 | $32,500 |
| Ages 60-63 | $24,500 | $11,250 | $35,750 |
For participants ages 60 through 63, SECURE 2.0 introduced a super catch-up provision. The super catch-up amount is set at 150% of the 2024 standard catch-up limit of $7,500, which equals $11,250. This figure is locked by statute and does not simply track the standard catch-up as it increases with inflation.
The total annual additions limit for 2026 includes employee deferrals, employer profit-sharing contributions, and after-tax contributions. For participants under age 50, the limit is 72,000 dollars. For participants age 50 and older using the standard catch-up, the total limit is 80,000 dollars.
For participants ages 60 through 63 using the super catch-up, the total limit is 83,250 dollars. Note that the catch-up contributions are added on top of the 72,000 dollar base limit under Section 415(c) of the Internal Revenue Code.
These catch-up amounts are subject to the Roth catch-up rule if the participant meets the income threshold. The rule applies to the catch-up dollars specifically, not to the base employee deferral. A participant earning 200,000 dollars can still make their standard 24,500 dollar employee deferral as pre-tax. Only the extra 8,000 or 11,250 dollar catch-up portion would be forced into Roth.
The Solo 401k Owner’s Guide to the Roth Catch-Up Rule
The Roth catch-up rule applies to Solo 401k plans just like any other 401(k). But the practical impact depends heavily on how your business is structured. Solo 401k owners fall into two categories: those who pay themselves W-2 wages (S-corporations) and those who do not (sole proprietors and single-member LLCs).
S-Corp Owners (W-2 Wages)
If you operate as an S-corporation and pay yourself a W-2 salary, the Roth catch-up rule applies to you directly. Your 2025 W-2 Box 3 wages determine whether your 2026 catch-up contributions must be Roth. If that amount exceeded $150,000, any catch-up contribution you make in 2026 must be a Roth contribution.
The rule uses Social Security wages (Box 3), not Medicare wages (Box 5). This matters for some government employees but is less relevant for most Solo 401k owners.
Sole Proprietors and Single-Member LLCs
If you report business income on Schedule C and do not receive W-2 wages, the Roth catch-up rule likely does not apply to you. The statute and final regulations base the requirement on “FICA wages from the employer sponsoring the plan”. A sole proprietor has no FICA wages because self-employment income is not reported on Form W-2.
However, there is nuance. Some tax professionals argue that sole proprietors are technically not subject to the wage test at all. Others suggest the IRS could issue future guidance applying a similar concept to self-employment income. The safest approach is to ensure your Solo 401k plan includes a Roth feature so you have the option regardless.
Key Planning Point
Even if the Roth catch-up rule does not technically apply to you, having Roth capabilities in your Solo 401k offers significant flexibility. You can voluntarily make Roth catch-up contributions if you prefer tax-free growth and no RMDs. Our Nabers Group Solo 401k plans include full Roth features.
The Final IRS Regulations – Effective Dates and Compliance
The IRS issued final regulations (TD 10033) on September 15, 2025, providing comprehensive guidance on the Roth catch-up rule. Understanding the effective dates is critical for compliance.
Statutory Effective Date: January 1, 2026. The Roth catch-up rule must be implemented starting in 2026. The transition relief period under Notice 2023-62 ended on December 31, 2025.
Regulatory Applicability Date: The final regulations generally apply to contributions in taxable years beginning after December 31, 2026. For 2026, the IRS will accept a reasonable, good-faith interpretation of the statutory provisions. This means you do not need perfect technical compliance in 2026 as long as you make a genuine effort to follow the rule.
Plan Amendment Deadline: The final amendment deadline for most plans is December 31, 2026. Later deadlines apply for collectively bargained and governmental plans. Solo 401k owners should ensure their plan document is amended to reflect the Roth catch-up rule by this date.
Benefits of Roth Catch-Up Contributions
Losing the upfront tax deduction may feel like a disadvantage, especially for high-income earners. But Roth contributions offer several significant benefits that can make the trade-off worthwhile.
- Tax-Free Growth
Earnings in a Roth account grow completely tax-free. With a pre-tax account, every dollar of growth is eventually taxed as ordinary income. Over decades, the difference can be substantial.
- No RMDs
Starting in 2024 under SECURE 2.0, designated Roth accounts in 401k plans are not subject to required minimum distributions during your lifetime. Pre-tax accounts require RMDs starting at age 73 for those born between 1951 and 1959, or age 75 for those born in 1960 or later. This allows Roth balances to continue growing tax-free for as long as you live.
- Tax Diversification
Having both pre-tax and Roth savings gives you flexibility in retirement. You can withdraw pre-tax dollars up to a certain tax bracket, then supplement with tax-free Roth dollars to avoid pushing yourself into a higher bracket.
For high earners who expect to be in the same or higher tax bracket in retirement, paying tax now on catch-up contributions can be a smart long-term move. The Roth catch-up rule essentially forces a strategy that many financial planners recommend voluntarily.
Preparing for the Roth Catch-Up Rule
Here is a concise checklist for Solo 401k owners preparing for 2026:
- Review your 2025 wages. If you are an S-corp owner, check your 2025 W-2 Box 3 wages. If over $150,000, prepare for Roth catch-up contributions in 2026.
- Confirm your Solo 401k plan allows Roth contributions. Not all plans do. Standard plans from mainstream brokerages may lack Roth features. Our Nabers Group plans include Roth options.
- Update payroll systems if you have employees. Work with your payroll provider to ensure catch-up contributions for affected participants are coded as Roth.
- Decide on a deemed Roth election approach. Consider whether your plan will automatically convert catch-up contributions to Roth for affected participants or require affirmative elections.
- Communicate with any employees in your plan. If you have employees who are subject to the Roth catch-up rule, ensure they understand the new requirement before January 1, 2026.
Common Misconceptions About the Roth Catch-Up Rule
“The rule was delayed indefinitely.”
No. The transition relief ended December 31, 2025. The Roth catch-up rule is effective January 1, 2026.
“Everyone age 50+ must make Roth catch-ups.”
No. Only those with prior-year FICA wages above the threshold ($150,000 for 2026 based on 2025 wages).
“The threshold is based on household income or AGI.”
No. It is based solely on FICA wages (Box 3 of Form W-2) from the employer sponsoring the plan.
“I can avoid the rule by contributing less.”
No. If you make any catch-up contribution, it must be Roth if you are subject to the rule. You cannot simply make a smaller pre-tax catch-up contribution.
“Plans without Roth options are fine.”
Not exactly. If a plan does not offer Roth contributions, participants subject to the Roth catch-up rule cannot make catch-up contributions at all. The plan itself remains compliant, but those individuals lose the ability to save catch-up amounts.
Plan Ahead for a Smooth Transition
The Roth catch-up rule represents a significant change for high-income retirement savers age 50 and older. The loss of an upfront tax deduction may sting, but the benefits of tax-free growth and no RMDs on Roth balances are valuable. For Solo 401k owners, the key is ensuring your plan is Roth-ready.
Review your plan documents today. If you are an S-corp owner, check your 2025 W-2 wages against the $150,000 threshold. If you are a sole proprietor, understand that the rule likely does not apply, but having Roth options remains beneficial. With proper planning, you can seamlessly transition to the new rules and continue building tax-advantaged retirement savings.
FAQ
Does the Roth catch-up rule apply to me if I am self-employed with no W-2 wages?
The statutory language applies to participants with FICA wages from the employer sponsoring the plan. Many tax professionals interpret this to exclude sole proprietors and partners with only self-employment income. However, the safest approach is to ensure your solo 401k offers Roth contributions in case the IRS issues further guidance.
What is the income threshold for 2026?
The threshold is 150,000 dollars of prior-year FICA wages based on 2025 wages. This amount is indexed for inflation and increased from the original 145,000 dollar base.
Can I convert my existing pre-tax catch-up contributions to Roth?
The rule applies prospectively to contributions made in 2026 and beyond. It does not require you to convert prior catch-up contributions. You may be able to do an in-plan Roth conversion of existing pre-tax balances, but that is a separate voluntary election, not required by the rule.
What happens if my plan does not offer Roth contributions?
Participants subject to the Roth catch-up rule cannot make catch-up contributions at all if the plan lacks Roth provisions. The plan itself remains compliant, but you lose the ability to make catch-up contributions. Solo 401k owners should verify their plan includes Roth options.
What are the 2026 catch-up limits for ages 60 to 63?
The super catch-up allows up to 11,250 dollars in catch-up contributions for participants ages 60 through 63. This is in addition to the standard 24,500 dollar employee deferral limit, for a total employee deferral of 35,750 dollars.
Does the Roth catch-up rule apply to SIMPLE IRAs?
No. The rule applies to 401(k), 403(b), and governmental 457(b) plans. It does not apply to SEP IRAs or SIMPLE IRA plans, though SIMPLE plans have their own catch-up rules.
What is the deadline for amending my plan to add Roth features?
The IRS final regulations generally require plan amendments by December 31, 2026. However, to accept Roth catch-up contributions starting January 1, 2026, your plan should already have Roth provisions in place.
