Why Retirement Plans Are a Freelancer's Best Tax Tool
Freelancers pay more tax than W-2 employees — 15.3% self-employment tax on top of regular income tax. A retirement plan contribution doesn't just build wealth; it's one of the most powerful above-the-line deductions available. Unlike business expense deductions, retirement contributions come directly off your AGI and reduce both income tax and, indirectly, your effective SE tax burden.
Two plans dominate for self-employed workers: the SEP-IRA and the Solo 401(k). Both are tax-deferred (or Roth for the Solo 401k), both have high contribution limits, and both are straightforward to set up. But they work very differently, and choosing the wrong one can cost you thousands in tax savings each year.
SEP-IRA: How It Works in 2026
A SEP-IRA (Simplified Employee Pension) is the simpler of the two plans. It takes about 15 minutes to open with any major brokerage (Fidelity, Vanguard, Schwab) and has almost no administrative burden.
SEP-IRA contribution rules
- Limit: Lesser of $72,000 or 25% of net SE income
- Net SE income = Schedule C net profit − half of SE tax
- Effective rate: Because of the SE tax deduction, the real percentage of Schedule C gross profit you can contribute is approximately 20%, not 25%
- Employees: If you hire W-2 employees, you must contribute the same percentage for them as you contribute for yourself — this kills the plan's value the moment you hire staff
SEP-IRA deadline
You can open and fund a SEP-IRA up to your tax filing deadline, including extensions. For 2026 taxes, that means October 15, 2027 with an extension filed by April 15, 2027. This is a major advantage for freelancers who know their income late or want to calculate the optimal contribution before committing.
Solo 401(k): How It Works in 2026
A Solo 401(k) — also called an Individual 401(k) or Self-Employed 401(k) — is technically more complex but offers dramatically higher contribution potential at lower income levels. It's only available to self-employed individuals with no full-time employees other than a spouse.
Solo 401(k) contribution rules
The Solo 401(k) has two separate contribution buckets:
- Employee elective deferral: Up to $24,500 (or 100% of net SE income if less). If you're 50 or older, add a $7,500 catch-up for a total of $32,000.
- Employer profit-sharing: Up to 25% of net SE income (same calculation as SEP-IRA).
Combined total cannot exceed $72,000 ($79,500 if 50+). The employee deferral portion is the key differentiator — it applies in full regardless of your business profit, as long as you have at least that much net income.
Roth Solo 401(k) option
Unlike a SEP-IRA, a Solo 401(k) can have a Roth component for the employee deferral. Roth contributions are after-tax now but grow tax-free — valuable if you expect to be in a higher bracket in retirement or want tax diversification.
Side-by-Side Comparison
| Feature | SEP-IRA | Solo 401(k) |
|---|---|---|
| 2026 max contribution | $72,000 | $72,000 ($79,500 age 50+) |
| Contribution formula | 25% of net SE income only | Employee deferral ($24,500) + 25% employer |
| Catch-up (age 50+) | None | +$7,500 employee catch-up |
| Roth option | No | Yes (employee portion) |
| Setup complexity | Very simple | Moderate (plan document required) |
| W-2 employees allowed | Yes (must contribute same %) | No (spouse only) |
| Loans against balance | No | Yes (up to 50% or $50,000) |
| Annual IRS filing (Form 5500) | None until $250K+ | Required once assets exceed $250,000 |
| Plan establishment deadline | Tax filing date (+ extensions) | December 31 of tax year |
| Contribution funding deadline | Tax filing date (+ extensions) | Tax filing date (+ extensions) |
Contribution Examples by Income Level
This is where the real difference becomes clear. At low-to-mid income levels, the Solo 401(k) wins decisively because the $24,500 employee deferral doesn't scale with income.
| Net Schedule C Profit | SEP-IRA Max | Solo 401(k) Max | Difference |
|---|---|---|---|
| $30,000 | ~$5,572 | ~$24,500 | +$18,928 Solo 401(k) |
| $50,000 | ~$9,287 | ~$30,787 | +$21,500 Solo 401(k) |
| $80,000 | ~$14,860 | ~$39,360 | +$24,500 Solo 401(k) |
| $100,000 | ~$18,587 | ~$43,087 | +$24,500 Solo 401(k) |
| $150,000 | ~$27,965 | ~$52,465 | +$24,500 Solo 401(k) |
| $245,000+ | $72,000 | $72,000 | Equal at max |
Calculations use net SE income = gross profit × 0.9235, then subtract half of SE tax. Approximate figures.
Real Tax Savings: 22% vs 24% Bracket
A retirement contribution saves you at your marginal rate — every dollar contributed reduces taxable income by one dollar. Here's what that means in real savings for a freelancer earning $80,000 in net profit:
| Plan | Max Contribution | Tax Savings (22%) | Tax Savings (24%) |
|---|---|---|---|
| SEP-IRA | ~$14,860 | ~$3,269 | ~$3,566 |
| Solo 401(k) | ~$39,360 | ~$8,659 | ~$9,446 |
Which Plan Should You Choose?
The answer depends on your net income level and situation:
Choose Solo 401(k) if:
- Your net SE income is below $245,000 (Solo 401k wins at every level below the cap)
- You're over 50 and want the $7,500 catch-up contribution
- You want a Roth option
- You want the ability to take loans from your plan
- You have no employees (other than a spouse)
Choose SEP-IRA if:
- You want the simplest possible setup (no plan document required)
- You procrastinate and need to open the account after year-end (SEP can be opened up to October 15 of the following year)
- You have or plan to hire employees (SEP scales to employees; Solo 401k doesn't)
- You're already at maximum income where both plans cap out equally
Deadlines and Setup Requirements
Missing a deadline can cost you an entire year of contributions. Here's the critical timeline for 2026:
| Action | SEP-IRA | Solo 401(k) |
|---|---|---|
| Open/establish plan | By Oct 15, 2027 (with extension) | By Dec 31, 2026 |
| Make contributions | By Oct 15, 2027 (with extension) | By Oct 15, 2027 (with extension) |
| Employee deferral election | N/A | Must be elected by Dec 31, 2026 |
Both plans can be invested in stocks, bonds, ETFs, mutual funds, or REITs at most major brokerages. Fidelity and Schwab offer no-fee Solo 401(k) plans; Vanguard charges a small annual fee. For a SEP-IRA, all three charge nothing to open or maintain.
Want to calculate how much you should set aside each quarter for retirement contributions? Use our Quarterly Tax Estimator to project your income and tax liability — then layer in your retirement contribution target to see how much it reduces your quarterly tax due. You can also use the SE Tax Calculator to see your exact SE tax liability before planning contributions.
For more on how retirement contributions interact with your overall tax picture, read our Self-Employment Tax Deduction guide and Top Tax Tips for Self-Employed Freelancers.
Frequently Asked Questions
What is the SEP-IRA contribution limit for 2026?
The 2026 SEP-IRA contribution limit is $72,000, or 25% of net self-employment income — whichever is less. Net SE income is your Schedule C net profit minus half of the self-employment tax. Because of this calculation, the effective rate is closer to 20% of your gross Schedule C profit.
Can a freelancer contribute to both a SEP-IRA and a Solo 401(k)?
No. You can only have one of these plans active for the same year — you must choose one or the other. However, you can also maintain a traditional or Roth IRA ($7,500 limit in 2026) in addition to either plan, though the deductibility of traditional IRA contributions phases out at higher incomes.
What is the Solo 401(k) contribution limit for 2026?
The Solo 401(k) has two parts: an employee elective deferral of up to $24,500 ($32,000 if 50+), plus an employer profit-sharing contribution of up to 25% of net SE income. The combined total cannot exceed $72,000 ($79,500 if 50+). The employee deferral portion applies regardless of profit level, making this plan far more powerful at lower incomes.
Which plan is better for low-income freelancers?
Solo 401(k) wins at lower income levels. At $50,000 net profit, a SEP-IRA limits you to about $9,287, while a Solo 401(k) allows contributions up to about $30,787 — more than three times as much. The Solo 401(k)'s flat employee deferral is the reason, and it continues to outperform SEP-IRA all the way up to roughly $245,000 in net income.
What is the deadline to open a Solo 401(k) for 2026?
You must establish a Solo 401(k) by December 31, 2026. You can fund it up to October 15, 2027 (with a tax extension), but the plan must be opened before year-end. In contrast, a SEP-IRA can be opened and funded up to October 15, 2027 entirely — making it more forgiving for last-minute planners.