Tax Basics

SEP IRA vs Solo 401(k): Which Retirement Account Saves You More in 2026?

2026-07-08 · Last reviewed: 2026-07-05

Retirement accounts are the single biggest tax-saving tool for self-employed individuals — but most freelancers choose the wrong one. The SEP IRA and Solo 401(k) both allow up to $70,000 in annual contributions, but they work very differently. Competitors list the contribution limits and say "consult a financial advisor" without giving you a decision tree. Here is the exact analysis.

Quick Answer: Which Account Should You Choose?

Bottom line: The Solo 401(k) wins for 90% of solo freelancers because it allows you to contribute more at lower income levels. The SEP IRA only wins for simplicity or if you plan to add employees.

How Each Account Works

Solo 401(k) — The Two-Part Contribution

As a self-employed individual with a Solo 401(k), you wear two hats: employee AND employer. Each hat gets its own contribution:

Employee contribution (2026 limits):

• Up to $23,500/year (under age 50)
• Up to $31,000/year (age 50+ with $7,500 catch-up)

Employer contribution:

• Up to 25% of your compensation (net self-employment income)
• Combined employee + employer cannot exceed $70,000 ($77,500 if 50+)

SEP IRA — The Employer-Only Contribution

A SEP IRA only allows employer contributions:

• Up to 25% of your net self-employment earnings
• Maximum: $70,000/year
• No employee contribution possible
• No catch-up contribution for age 50+

Contribution Comparison by Income Level

At $50,000 Net Income

*Employer contribution is 25% of compensation after reducing by the employer contribution itself. For a sole proprietor with $50K net income, compensation = $50K × 0.9235 ÷ 1.25 × 25% = $9,242. Rounded for simplicity.

The Solo 401(k) allows $23,500 MORE in contributions at $50K income because of the employee portion. This is the critical difference competitors gloss over.

At $100,000 Net Income

At $150,000 Net Income

At $200,000 Net Income

At $280,000+ Net Income (Both Max Out)

Above ~$280K net income, both accounts max out at $70,000. The Solo 401(k) loses its advantage at very high incomes.

The $23,500 Advantage

The Solo 401(k)'s killer feature is the $23,500 employee contribution. This is available regardless of your income level — even if you earn just $24,000, you can contribute $23,500 as an employee.

With a SEP IRA, your contribution is limited to 25% of income. To contribute $23,500 via SEP IRA, you need to earn $94,000+ in net self-employment income.

That extra $23,500 saves you $5,640/year in taxes at the 24% bracket. Over 20 years of investing, that is $470,000 in additional contributions (plus growth).

Feature-by-Feature Comparison

When to Choose a SEP IRA

1. You Want Maximum Simplicity

A SEP IRA can be opened in 10 minutes with any brokerage (Vanguard, Fidelity, Schwab). No plan document, no annual filing, no complexity. Just fill out Form 5305-SEP and start contributing.

2. You Have or Plan to Add Employees

With a Solo 401(k), you cannot have full-time employees (except a spouse). If you hire employees, you need a traditional 401(k) plan. A SEP IRA allows you to contribute for eligible employees with less administrative burden.

3. You Missed the December 31 Deadline

You can open and fund a SEP IRA up until the tax filing deadline (April 15, or October 15 with an extension). A Solo 401(k) must be opened by December 31 of the tax year — though you can still fund it until April 15.

4. Your Income Is Very High ($300K+)

At very high incomes, both accounts max out at $70,000. The SEP IRA's simplicity wins when the contribution advantage disappears.

When to Choose a Solo 401(k)

1. Your Income Is Under $280K

The employee contribution gives you $23,500 more in tax-advantaged savings — worth $5,640+ in tax savings at the 24% bracket.

2. You Want a Roth Option

A Solo 401(k) can include a Roth sub-account, allowing after-tax contributions that grow tax-free. This is valuable if you expect to be in a higher tax bracket in retirement.

3. You Want Loan Access

You can borrow up to $50,000 (or 50% of your balance, whichever is less) from a Solo 401(k) without taxes or penalties. SEP IRAs do not allow loans.

4. You Are 50 or Older

The $7,500 catch-up contribution is only available on the employee side — which means it is only available with a Solo 401(k). This pushes the total limit to $77,500 vs $70,000 for SEP IRA.

5. You Want to Maximize Contributions Early

The Solo 401(k) lets you front-load contributions at lower income levels. A freelancer earning $50K can shelter $29,305 with a Solo 401(k) vs only $5,805 with a SEP IRA.

The SIMPLE IRA: The Third Option

The SIMPLE IRA is a third option for very small businesses, but it is rarely the best choice for solo freelancers:

The SIMPLE IRA's contribution limit is much lower than the other two options. It is only worth considering if you have a few employees and want a low-cost plan.

Can You Have Both?

Yes. You can have a SEP IRA and a Solo 401(k) at the same time, but the total employer contribution across both accounts cannot exceed 25% of your compensation. The employee contribution to the Solo 401(k) is separate and does not count against the SEP IRA limit.

Strategy for high earners: Contribute $23,500 as employee to a Solo 401(k), then use a SEP IRA for the employer portion if you prefer the simpler administration.

Setup Guide

Solo 401(k) Setup Steps

1. Choose a provider (Vanguard, Fidelity, Schwab, or a specialty provider like Nabers Group)
2. Complete the plan adoption agreement (usually online)
3. Obtain an EIN from the IRS (free, instant)
4. Open the account and make your first contribution
5. File Form 5500-EZ annually once assets exceed $250,000

SEP IRA Setup Steps

1. Choose a provider (any major brokerage)
2. Fill out Form 5305-SEP (one page)
3. Open the account and contribute
4. No annual filing required

Frequently Asked Questions

Q: How much can I contribute to a Solo 401(k) in 2026? Up to $70,000 ($77,500 if age 50+). This includes $23,500 as an employee contribution plus up to 25% of your compensation as an employer contribution.

Q: How much can I contribute to a SEP IRA in 2026? Up to 25% of your net self-employment earnings, with a maximum of $70,000. There is no employee contribution and no catch-up for age 50+.

Q: Can I have a Solo 401(k) if I have a W2 job with a 401(k)? Yes, but the $23,500 employee contribution limit is SHARED across all 401(k) plans. If your W2 employer's 401(k) already has $15,000 contributed, you can only contribute $8,500 as an employee to your Solo 401(k). The employer contribution is separate and unlimited by the employee cap.

Q: When is the deadline to open a Solo 401(k)? The plan must be established by December 31 of the tax year. You can make contributions until the tax filing deadline (April 15, or October 15 with extension). A SEP IRA can be opened and funded up until the tax filing deadline.

Q: Is a Solo 401(k) or SEP IRA better for reducing self-employment tax? Neither. Retirement contributions reduce your income tax, not your self-employment tax. SE tax is calculated on net business income before retirement contributions. To reduce SE tax, you need an S-Corp election. Read our How to Pay Less SE Tax guide for details.

Q: Can I roll over a SEP IRA into a Solo 401(k)? Yes. You can roll over SEP IRA funds into a Solo 401(k) to consolidate accounts and gain loan access. The rollover is tax-free.

The Bottom Line

For the vast majority of solo freelancers earning under $280K, the Solo 401(k) is the clear winner — it allows $23,500 more in contributions, offers a Roth option, and permits loans. The SEP IRA is better only for those who want maximum simplicity, have employees, or earn so much that both accounts max out at $70,000.

Calculate your exact contribution limits and tax savings using our 1099 Tax Calculator, and read our Freelancer Tax Savings Guide for how retirement contributions stack with other deductions.

Source: IRS 2026 tax publications, Social Security Administration, and state revenue departments. This article is for informational purposes only and should not be considered tax advice.