How to Set Up a Solo 401(k) for Self-Employed Freelancers: Contribution Limits, Provider Comparison & IRS Reporting
What Is a Solo 401(k) and Why Freelancers Should Consider One
A Solo 401(k), also known as an individual 401(k) or one-participant 401(k), is a powerful retirement savings plan designed for self-employed individuals and business owners with no full-time employees other than a spouse. For freelancers, it offers significantly higher contribution limits than a SEP IRA or Traditional IRA, along with the flexibility of both Traditional (pre-tax) and Roth (after-tax) contributions. Unlike employer-sponsored 401(k) plans, a Solo 401(k) puts you in full control of your retirement savings strategy. You act as both the employer and employee, which means you can maximize contributions on both sides of the equation.
Step-by-Step Guide to Setting Up Your Solo 401(k)
Step 1: Confirm Your Eligibility
You must have self-employment income from freelancing, consulting, or a side business. This includes sole proprietorships, single-member LLCs, partnerships, and S-corps. You cannot have any full-time W-2 employees (a spouse who works for you is the only exception). If you have part-time employees who work fewer than 1,000 hours per year, you may still qualify.
Step 2: Choose Between Traditional and Roth Contributions
A Solo 401(k) allows you to make Traditional (pre-tax) contributions that reduce your taxable income now, or Roth (after-tax) contributions that grow tax-free and are not taxed in retirement. Many freelancers use a combination of both to diversify their tax exposure. Not all providers offer a Roth option, so verify this before selecting a provider.
Step 3: Select a Solo 401(k) Provider
Compare providers based on fees, investment options, Roth availability, and loan features. See the provider comparison table below for details.
Step 4: Complete the Plan Adoption Agreement
Your chosen provider will supply a plan adoption agreement and an Employer Identification Number (EIN) is required. If you operate as a sole proprietor, apply for a free EIN from the IRS at irs.gov. Complete all required documents, including IRS Form SS-4 if you do not already have an EIN.
Step 5: Open and Fund the Account
Once approved, fund the account with your employee deferral (from your freelance income) and employer profit-sharing contribution. You can make contributions any time during the calendar year, but the plan must be established by December 31 of the tax year to make contributions for that year. Employer contributions can be made until the tax-filing deadline (including extensions).
Step 6: File Required IRS Reports Annually
If your Solo 401(k) plan assets exceed $250,000 at the end of the plan year, you must file IRS Form 5500-EZ by July 31 of the following year. Below the threshold, no annual filing is required. Keep records of all contributions, rollovers, and distributions.
2026 Solo 401(k) Contribution Limits
| Contribution Type | Under Age 50 | Age 50 and Over | Ages 60–63 (SECURE 2.0) |
|---|---|---|---|
| Employee Deferral (Elective) | $23,500 | $31,000 ($23,500 + $7,500 catch-up) | $35,000 ($23,500 + $11,500 super catch-up) |
| Employer Profit-Sharing | Up to 25% of net self-employment income* | Up to 25% of net self-employment income* | Up to 25% of net self-employment income* |
| Total Combined Maximum | $70,000 | $77,500 | $81,500 |
Solo 401(k) Provider Comparison
| Provider | Account Fees | Roth Option | Loan Feature | Investment Options | Best For |
|---|---|---|---|---|---|
| **Fidelity** | $0 | Yes | No | Fidelity funds, ETFs, stocks, bonds | Low-cost passive investors |
| **Charles Schwab** | $0 | Yes | No | Schwab funds, ETFs, stocks, bonds | Beginners wanting robust research tools |
| **Vanguard** | $20/year per fund (waived with e-delivery) | Yes | No | Vanguard funds and ETFs | Index fund enthusiasts |
| **E*TRADE (Morgan Stanley)** | $0 | Yes | Yes | ETFs, stocks, bonds, mutual funds | Those who want a loan feature |
| **Rocket Dollar** | $15/month (Gold) or $30/month (Gold Plus) | Yes | No | Real estate, crypto, private equity, alternatives | Self-directed investors wanting alternatives |
| **MySolo401k.net** | $590 setup + $125/year | Yes | Yes | Checkbook control, real estate, alternatives | Advanced self-directed investors |
Can I have a Solo 401(k) if I also have a full-time W-2 job?
Yes, you can maintain a Solo 401(k) for your freelance income alongside your employer’s 401(k). However, the employee deferral limit of $23,500 (2026) is shared across all 401(k) plans. If you contribute $15,000 at your W-2 job, you can only defer $8,500 to your Solo 401(k). The employer profit-sharing portion is calculated independently based on your self-employment income and is not affected by your W-2 employer’s plan.
When is the deadline to open and fund a Solo 401(k)?
The plan must be established by December 31 of the tax year you want to claim. Employee deferrals must also be made by December 31 (or by your business’s fiscal year-end). However, employer profit-sharing contributions can be made up until your tax filing deadline, including extensions — typically October 15 for sole proprietors who file for an extension. This gives freelancers extra months to fund the employer portion.
What happens if I exceed the Solo 401(k) contribution limits?
Excess employee deferrals must be corrected by April 15 of the following year by withdrawing the excess plus any associated earnings. If not corrected, you face double taxation — once in the year the excess was contributed and again when distributed. Excess employer contributions must be removed and reported as income. To avoid this, calculate your net self-employment income carefully before making contributions, ideally with the help of a tax professional familiar with self-employment retirement plans.