Solo 401(k) at Any Age: $72,000 Under 50, $83,250 at 60–63
Key takeaways: Solo 401(k) limits for 2026
- The overall Solo 401(k) contribution limit for 2026 is $72,000, combining employee, employer, and voluntary after-tax contributions, and it cannot exceed self-employment compensation.
- The 2026 Solo 401(k) employee deferral limit is $24,500, capped at 100% of self-employment compensation.
- Participants age 50 to 59, or 64 and older, at the end of 2026 may add an $8,000 catch-up contribution, raising the potential total to $80,000.
- SECURE 2.0 created an $11,250 super catch-up for ages 60 to 63 in 2026, replacing the $8,000 catch-up and raising the potential total to $83,250.
- A spouse who works in the business and has earned self-employment income can join the Solo 401(k), and two spouses could contribute $144,000 or more in 2026.
- A Mega Backdoor Roth requires a plan document that allows voluntary after-tax contributions, and that standard discount-brokerage Solo 401(k) plans do not allow them.
- Per IRS Publication 560 as cited in the webinar, the contribution deadline is the business tax return deadline, including timely filed extensions.

How much can I contribute to a Solo 401(k) in 2026 if I’m over 50?
A Solo 401(k) participant age 50 or older at the end of 2026 can add a catch-up contribution on top of the standard limits. The standard catch-up for 2026 is $8,000.
“So for 2026, your standard catch-up contribution amount is $8,000. Now, that’s on top of the $24,500 base because really the catch-up contribution is just an additional employee contribution.”
The Solo 401(k) catch-up rules for ages 50 to 59 also apply to anyone age 64 or older at the end of 2026. The $24,500 base deferral stays in place, and employer and voluntary after-tax contributions can still be added.
What is the Solo 401(k) super catch-up for ages 60 to 63?
SECURE 2.0 created a super catch-up contribution for Solo 401(k) participants age 60 to 63 as of the end of 2026. The super catch-up is $11,250 instead of the $8,000 standard catch-up.
“Now, with SECURE Act 2.0, an additional catch-up contribution bucket was created. Now, this is instead of your standard catch-up contribution. So instead of $8,000, if you’re age 60 to 63 as of the end of 2026, you can make a $11,250 super catch-up contribution.”
A Solo 401(k) participant in that age band can defer up to $35,750 as an employee. Adding employer or voluntary after-tax contributions brings potential 2026 contributions to $83,250, subject to income.
| Age group | Employee deferral | Catch-up | Total employee deferral | Potential total with employer or after-tax |
|---|---|---|---|---|
| Under 50 | $24,500 | None | $24,500 | $72,000 |
| 50 to 59, or 64 and older | $24,500 | $8,000 | $32,500 | $80,000 |
| 60 to 63 | $24,500 | $11,250 (super catch-up) | $35,750 | $83,250 |
The Solo 401(k) 2026 potential total is $72,000 under age 50, $80,000 at ages 50 to 59 and 64 and older, and $83,250 at ages 60 to 63, each subject to sufficient self-employment income.
Live webinar: Never Too Late: Using a Solo 401(k) to Supercharge Your Retirement Savings at Any Age, hosted by My Solo 401k Financial.
Is it too late to open a Solo 401(k) for 2026?
A Solo 401(k) can still be established for 2026.
“There is good news though for solopreneurs who are therefore eligible to set up a Solo 401(k) as it is purpose-built to help you catch up fast. The clock is ticking, but the window is still open.”
My Solo 401k Financial establishes a Solo 401(k) within the same business day. This preserves the ability to make 2026 contributions by the 2026 business tax return deadline, including extensions into 2027.
“Now, for 2026, you have time. You can establish the plan by the end of the year. So, December 31st. And really, that just means signing up with My Solo 401k Financial because we established the plan within the same business day.”
Who qualifies for a Solo 401(k)?
A Solo 401(k) is available to self-employed individuals with no full-time non-owner, non-spouse W-2 employees. A business owned by the individual or a spouse must have no such employees.
The Solo 401(k) has the highest contribution limits of any defined contribution plan available to self-employed individuals. The owner can contribute as both employee and employer, which fills multiple contribution buckets.
What are the Solo 401(k) contribution buckets?
A Solo 401(k) offers up to five buckets in 2026m. All contributions combined cannot exceed the lesser of self-employment compensation or the $72,000 overall limit, before catch-up.
| Contribution type | Tax treatment | 2026 limit stated in the webinar | Who can use it |
|---|---|---|---|
| Employee deferral | Pre-tax or Roth | 100% of self-employment compensation, up to $24,500 | All participants |
| Catch-up | Employee contribution | $8,000 | Age 50 to 59, or 64 and older |
| Super catch-up | Employee contribution | $11,250 instead of $8,000 | Age 60 to 63 |
| Employer profit sharing | Pre-tax | 20% or 25% of self-employment income, depending on how the business is taxed | All participants with self-employment income |
| Voluntary after-tax | After-tax, convertible to Roth | 100% of self-employment compensation, up to the $72,000 overall limit | Plans that allow it |
Can a spouse contribute to the same Solo 401(k)?
A spouse who works in the business can be added to the same Solo 401(k) and still keep it a Solo 401(k). The spouse receives a separate set of contribution buckets.
“So, if each spouse has the income to justify it between the two for 2026, they could be contributing $144,000 and more if they’re both eligible for catch-up contributions as well.”
The spouse does not need to own the business. The spouse must work in the business and have earned self-employment income. Each spouse’s limit depends on age, self-employment income, and contributions to any other plan.
What is a Mega Backdoor Roth in a Solo 401(k)?
A Mega Backdoor Roth saves more into a Roth account than standard Roth IRA or Roth 401(k) limits allow. A Solo 401(k) participant uses a two-step process.
Step one is a voluntary after-tax contribution, which the plan document must allow. Step two converts the after-tax funds to a Roth Solo 401(k) or a Roth IRA. Read the Mega Backdoor Roth Solo 401(k) guide for the full process.
“With the mega backdoor Roth individuals can contribute up to $72,000 for 2026 where those funds end up in your Roth account. So that’s almost 10 times what that individual could contribute for example to a Roth IRA.”
The voluntary after-tax limit is 100% of self-employment compensation, dollar for dollar, up to the $72,000 overall limit. Other employee and employer contributions count toward that same overall limit.
Standard discount-brokerage Solo 401(k) plans do not allow Mega Backdoor Roth contributions. A participant needs a plan document that permits voluntary after-tax contributions.
How do traditional and Roth contributions compare in a Solo 401(k)?
A Solo 401(k) from My Solo 401k Financial allows traditional pre-tax, Roth, and Mega Backdoor Roth contributions. Traditional contributions reduce taxable income for the contribution year.
Roth contributions do not reduce taxable income for the contribution year, but they offer potential tax-free growth. Some commentators say traditional contributions suit a high bracket today, while Roth suits expected rate increases.
An in-plan Roth conversion moves pre-tax dollars already in the Solo 401(k) to Roth status. Tax is owed for the year of conversion, and later growth has the potential to be tax-free.
Can I roll an old 401(k) or IRA into a Solo 401(k)?
A Solo 401(k) can receive rollovers from a former employer plan or an IRA. Many participants age 50 and older consolidate old accounts into one Solo 401(k) for administrative ease.
A self-directed Solo 401(k) plan from My Solo 401k Financial allows stocks, bonds, mutual funds, real estate, private equity, precious metals, and cryptocurrency. Prohibited transaction rules still apply. A Solo 401(k) can invest in real estate but cannot rent it to the owner’s child.
Solo 401(k) FAQ: 2026 limits, catch-up, spouses, and Mega Backdoor Roth
What is the total Solo 401(k) contribution limit for 2026?
The total Solo 401(k) contribution limit for 2026 is $72,000, according to the webinar. The total combines employee, employer, and voluntary after-tax contributions and cannot exceed self-employment compensation. Participants age 50 or older can add an $8,000 catch-up, and those age 60 to 63 can add an $11,250 super catch-up instead, reaching $80,000 or $83,250 with enough income.
What is the Solo 401(k) super catch-up limit for ages 60 to 63?
The Solo 401(k) super catch-up limit for 2026 is $11,250 for participants age 60 to 63 as of the end of 2026. SECURE 2.0 created the super catch-up. The super catch-up replaces the standard $8,000 catch-up, so total employee deferrals can reach $35,750 and total potential contributions can reach $83,250 with enough self-employment income.
Can my spouse contribute to my Solo 401(k)?
A spouse can contribute to the same Solo 401(k) if the spouse works in the business and has earned self-employment income. The spouse does not need to own the business. Each spouse receives a separate set of contribution buckets. Two eligible spouses could contribute $144,000 or more in 2026, depending on age, income, and other plan contributions.
Can I still open a Solo 401(k) for 2026 in December?
A Solo 401(k) can be established for 2026 by December 31, 2026. My Solo 401k Financial establishes plans within the same business day. 2026 contributions can be made by the 2026 business tax return deadline, including extensions into 2027, and deadlines vary by business tax classification.
Can a Solo 401(k) after-tax contribution made in 2026 count for 2025?
Yes. IRS Publication 560 sets the contribution deadline at the business tax return deadline, including timely filed extensions. For example, a sole proprietorship can make 2025 contributions by April 15, or October 15 with an extension. A calendar-year S corporation can make them by March 15, or September 15 with an extension.
Does a Solo 401(k) allow Mega Backdoor Roth contributions?
A Solo 401(k) allows Mega Backdoor Roth contributions only if the plan document permits voluntary after-tax contributions. The process has two steps: make the after-tax contribution, then convert it to a Roth Solo 401(k) or Roth IRA. Standard discount-brokerage Solo 401(k) plans do not allow these contributions.
How is a Mega Backdoor Roth transfer reported on Form 1099-R?
A transfer to the Roth account is reported on Form 1099-R for the year of transfer, not the year of contribution. A 2025 contribution transferred in 2026 appears on the 2026 Form 1099-R. My Solo 401k Financial prepares the form at no additional charge as long as the client submits the website form in a timely manner.
This article is based on the live webinar hosted by My Solo 401k Financial.




















