SEP-IRA vs Solo 401(k) for Spiritual Practitioners: Contribution Comparison and When Each Wins
At $50k net, Solo 401(k) allows ~$36,750 vs SEP-IRA ~$12,250. Dec 31 formation deadline, age 60-63 catch-up rules, and the W-2 overlap trap.
Both plans let self-employed practitioners shelter business income from taxes and invest it for retirement. The overall 2026 contribution ceiling is the same for both. But at most income levels below $150,000, the Solo 401(k) allows significantly larger contributions - because it has an employee deferral component that the SEP-IRA does not.
The SEP-IRA wins on simplicity. No plan documents, no December 31 formation deadline, no annual IRS filing. If that simplicity is worth the smaller contribution room, it is the better choice. If you want to maximize the shelter on moderate income, the numbers point to Solo 401(k).
How Each Plan Calculates Contributions
SEP-IRA: Employer contributions only. Maximum is 25% of net self-employment compensation - which means 25% of (net earnings x 92.35%). No employee deferral. No catch-up contributions at any age.
Solo 401(k): Two-part contribution:
1. Employee deferral: up to $24,500 in 2026 (this limit is not tied to income percentage - it is a flat cap).
2. Employer contribution: up to 25% of net SE compensation.
3. Total capped at the annual overall limit (see note on 2026 limit below).
The 2026 overall annual contribution limit - applicable to both plans - is published at irs.gov/retirement-plans. Confirm the current figure there before filing, as IRS announces the limit each fall and multiple sources cite varying estimates for 2026.
Contribution Comparison by Income Level
Net SE income | SEP-IRA (25% of adjusted net) | Solo 401(k) (deferral + employer) | Solo 401(k) advantage |
|---|---|---|---|
$25,000 | ~$6,100 | ~$24,500 deferral + ~$6,100 employer = ~$30,600* | ~$24,500 |
$50,000 | ~$12,250 | ~$24,500 deferral + ~$12,250 employer = ~$36,750* | ~$24,500 |
$100,000 | ~$24,500 | ~$24,500 deferral + ~$24,500 employer = ~$49,000* | ~$24,500 |
$150,000+ | Approaches overall cap | Approaches overall cap | Narrows at high income |
*Capped at the 2026 overall annual limit; confirm current limit at irs.gov/retirement-plans.
Key insight: At $50,000 net income, the Solo 401(k) allows roughly three times the SEP-IRA contribution. That gap is entirely the employee deferral - a flat amount the SEP-IRA simply does not offer. At very high incomes (roughly $200,000+), both plans converge near the overall cap.
Source: udirectira.com (uDirect IRA, 2026); wealthstack.us (Wealthstack, 2026); fraimcpa.com (Fraim CPA, 2026).
The December 31 Deadline Problem
This is the most common mistake spiritual practitioners make with Solo 401(k)s.
- Solo 401(k): The plan must be established (paperwork signed, plan documents in place) by December 31 of the tax year. Contributions can be made up to the filing deadline, but the plan must exist by year-end. A practitioner who decides in February to set up a Solo 401(k) for the prior year cannot do it.
- SEP-IRA: Can be established and funded up to the tax filing deadline, including extensions. A practitioner filing an extension until October 15 can open and fully fund a SEP-IRA in October for the prior tax year.
If you are reading this in October and thinking about retirement contributions for the current year, the SEP-IRA is your only option unless a Solo 401(k) already exists.
The W-2 Overlap Trap
If you have a full-time job with a W-2 employer 401(k), you need to know this: the employee deferral limit ($24,500 in 2026) is shared across all plans in the same year.
You cannot contribute $24,500 to your W-2 employer's 401(k) and another $24,500 to your Solo 401(k). The combined employee deferral across all plans is capped at $24,500. The employer contribution side of the Solo 401(k) is separate and not shared - but the flat deferral amount is.
For practitioners with W-2 employment who have already maxed the employer 401(k) employee deferral, the Solo 401(k) employer-side contribution is still available. But the SEP-IRA (employer-only) is unaffected by the W-2 plan's employee deferrals - it has no employee deferral to share.
Source: forusall.com (ForUsAll, 2026); employeefiduciary.com (Employee Fiduciary).
Catch-Up Contributions
Age | SEP-IRA catch-up | Solo 401(k) catch-up |
|---|---|---|
Under 50 | None | None |
50+ | None (no catch-up in SEP-IRA) | $8,000 additional above the $24,500 deferral |
60-63 (SECURE 2.0) | None | $11,250 additional (replaces standard catch-up for this age band) |
For a practitioner aged 60 building toward retirement, the Solo 401(k) allows the base deferral plus $11,250 catch-up plus the 25% employer contribution - substantially more shelter than the SEP-IRA at any income level. The SECURE 2.0 Act enhanced catch-up for ages 60-63 applies from 2025 onward.
Source: udirectira.com (uDirect IRA, 2026); forusall.com (ForUsAll, 2026).
Administrative Requirements Side by Side
Feature | SEP-IRA | Solo 401(k) |
|---|---|---|
Plan documents required | No | Yes (one-time setup) |
Establishment deadline | Tax filing deadline (with extension) | December 31 of tax year |
Annual IRS filing | None below $250k assets | Form 5500-EZ once assets exceed $250k |
Roth option | No | Yes (Roth Solo 401(k)) |
Participant loans | No | Yes |
Eligible providers | Fidelity, Vanguard, Schwab (free, no annual fees) | Fidelity, Vanguard, Schwab, E*TRADE |
When SEP-IRA Makes Sense
- You want zero administrative overhead - no plan documents, no annual filings, no December 31 deadline.
- Your income is high enough that 25% of adjusted net already approaches the overall cap, making the employee deferral irrelevant.
- You have a W-2 job and have already maxed your employer's 401(k) deferral - the Solo 401(k) deferral is not usable anyway.
- You want to decide in January or February whether to contribute for the prior year.
When Solo 401(k) Makes Sense
- Your net income is between $25,000 and $150,000 and you want to maximize the tax shelter.
- You are 50 or older and want catch-up contributions that the SEP-IRA does not offer.
- You want a Roth option (after-tax contributions that grow tax-free).
- You want the ability to take a loan from the plan if needed.
Frequently Asked Questions
Can I have both a SEP-IRA and a Solo 401(k) in the same year?
Generally yes, but contributions count toward the same overall annual cap. Having both does not double the ceiling. In practice, most practitioners choose one - the administrative complexity of maintaining two plans rarely provides additional benefit.
I have one employee. Does that disqualify me from a Solo 401(k)?
Yes. Solo 401(k) plans are for business owners with no full-time employees other than a spouse. If you hire a full-time employee (working 1,000+ hours per year), the plan loses its "solo" qualification and must convert to a traditional 401(k) plan with coverage for employees. Part-time employees under 500 hours can generally be excluded, with rules under SECURE 2.0 changing the thresholds from 2024 onward.
Where should I actually open a Solo 401(k)?
Fidelity, Vanguard, Schwab, and E*TRADE all offer Solo 401(k) plans with no account fees and a wide investment selection. Fidelity's plan allows Roth contributions; Vanguard's traditional Solo 401(k) does not as of 2026. Confirm current plan features directly with the provider before opening.
Does contributing to a SEP-IRA or Solo 401(k) reduce my SE tax?
No. Retirement plan contributions reduce your income tax (they are deducted on Schedule 1, reducing AGI) - but SE tax is calculated on net SE earnings before the retirement deduction. The SE tax deduction (50% of SE tax) is a separate line on Schedule 1. Retirement contributions do not affect SE tax.
Related guides: US quarterly estimated taxes - US Schedule C deductions - S corp election for spiritual businesses