Self-Employed Retirement Plans: SEP-IRA vs Solo 401(k)
Key Takeaways
- 2024 contribution limit: Up to $69,000 (SEP-IRA & Solo 401k)
- Solo 401(k): Best for high earners, Roth option available
- SEP-IRA: Simplest to set up and manage
- Contributions reduce taxable income dollar-for-dollar
- Deadline: Solo 401(k) must be opened by Dec 31
- Tax savings: $50k contribution saves $15k-20k in taxes
Self-employed retirement plans are one of the most powerful tax reduction strategies available to 1099 contractors. Unlike employees limited to $23,000/year in 401(k) contributions, you can contribute up to $69,000 in 2024.
Every dollar you contribute reduces your taxable income. If you're in the 24% tax bracket, a $50,000 contribution saves you $12,000 in federal taxes alone—plus you're building retirement wealth.
In this guide, you'll learn the differences between SEP-IRA, Solo 401(k), and SIMPLE IRA, which plan is best for your situation, and exactly how much you can contribute.
Quick Comparison: Which Plan is Best?
| Feature | SEP-IRA | Solo 401(k) | SIMPLE IRA |
|---|---|---|---|
| 2024 Max Contribution | $69,000 | $69,000 | $16,000 |
| Contribution Formula | 25% of net SE income | $23,000 + 25% of income | $16,000 + 3% match |
| Roth Option | No | Yes | No |
| Catch-up (50+) | No | +$7,500 | +$3,500 |
| Loan Option | No | Yes | No |
| Setup Deadline | Tax filing date | Dec 31 | Oct 1 |
| Complexity | Very Easy | Moderate | Easy |
| Best For | Simple, high-income | Most freelancers | Lower income, employees |
SEP-IRA: Simplified Employee Pension
The SEP-IRA is the simplest retirement planfor self-employed individuals. Setup takes minutes, there's no annual reporting, and you can contribute up to tax day.
SEP-IRA Contribution Limits (2024)
- Maximum: $69,000 or 25% of net self-employment income (whichever is less)
- Calculation: Net profit × 0.9235 × 25%
- Example: $200,000 net profit = $46,175 max contribution
Pros
- Extremely simple to set up and manage
- No annual reporting requirements
- Can open and fund until tax filing deadline
- Higher limit than traditional IRA
Cons
- No Roth option (all contributions pre-tax)
- Lower contribution limits at lower income levels
- No catch-up contributions if over 50
- Must contribute same % for employees (if any)
Solo 401(k): Individual 401(k)
The Solo 401(k) offers the most flexibility and highest contribution potential for most self-employed individuals. It combines employee and employer contributions.
Solo 401(k) Contribution Limits (2024)
- Employee contribution: $23,000 (plus $7,500 catch-up if 50+)
- Employer contribution: 25% of net self-employment income
- Total maximum: $69,000 ($76,500 if 50+)
- Example: $100,000 net profit = $23,000 + $23,088 = $46,088 max
Why Solo 401(k) is Often Better
At lower income levels, Solo 401(k) allows significantly higher contributions because of the flat $23,000 employee contribution:
Comparison at $100,000 Net Income:
SEP-IRA max: ~$23,000 (25% of income)
Solo 401(k) max: ~$46,000 (employee + employer)
Solo 401(k) allows 2x more contribution!
Pros
- Higher contribution limits at most income levels
- Roth option available (tax-free growth)
- Catch-up contributions if 50+
- Can borrow against the balance
- Employee + employer contributions
Cons
- Must be established by December 31
- Annual Form 5500-EZ if balance exceeds $250,000
- Slightly more complex to set up
- Can't have employees (other than spouse)
Contribution Examples by Income Level
$50,000
Net Income
SEP-IRA Max:
$11,538
Solo 401(k) Max:
$34,538
$100,000
Net Income
SEP-IRA Max:
$23,076
Solo 401(k) Max:
$46,076
$150,000
Net Income
SEP-IRA Max:
$34,615
Solo 401(k) Max:
$57,615
$250,000
Net Income
SEP-IRA Max:
$57,692
Solo 401(k) Max:
$69,000
$300,000+
Net Income
SEP-IRA Max:
$69,000
Solo 401(k) Max:
$69,000
Which Retirement Plan Should You Choose?
Choose SEP-IRA If:
- You want the simplest option
- It's after Dec 31 and you need to open an account
- You have very high income ($300k+)
- You don't need Roth contributions
- Minimal paperwork is priority
Choose Solo 401(k) If:
- You want maximum contribution flexibility
- Your income is under $250,000
- You want Roth option for tax-free growth
- You're over 50 and want catch-up contributions
- You might need to borrow from retirement
Our Recommendation:
For most 1099 contractors earning $50,000-$200,000, the Solo 401(k) is the best choice. It allows higher contributions at lower income levels and offers Roth flexibility.
Tax Savings from Retirement Contributions
Retirement contributions reduce your taxable income dollar-for-dollar. Here's how much you can save:
| Contribution | 22% Bracket | 24% Bracket | 32% Bracket |
|---|---|---|---|
| $10,000 | $2,200 | $2,400 | $3,200 |
| $25,000 | $5,500 | $6,000 | $8,000 |
| $50,000 | $11,000 | $12,000 | $16,000 |
| $69,000 | $15,180 | $16,560 | $22,080 |
Note: These are federal income tax savings only. You'll also potentially save on state income tax. Retirement contributions do NOT reduce self-employment tax.
Frequently Asked Questions
What is the maximum I can contribute to a self-employed retirement plan?
For 2024, the maximum is $69,000 for SEP-IRA and Solo 401(k). Solo 401(k) can reach this limit more easily because it allows both employee and employer contributions.
Can I have both a SEP-IRA and Solo 401(k)?
Technically yes, but the contribution limits are shared. You can't contribute the maximum to both. Most people choose one or the other based on their needs.
Which retirement plan is best for high earners?
Solo 401(k) is typically best for high earners because you can contribute more at lower income levels and have the option to add after-tax Roth contributions.
What's the deadline to set up these accounts?
SEP-IRA: Can be set up until your tax filing deadline (including extensions). Solo 401(k): Must be established by December 31 of the tax year. Contributions can be made until your filing deadline.
Do retirement contributions reduce self-employment tax?
No. Retirement contributions reduce your income tax but NOT your self-employment tax. SE tax is calculated before the retirement deduction.
Bottom Line
Self-employed retirement plans are one of the best tax reduction strategies available. A Solo 401(k) offers the most flexibility for most freelancers, while a SEP-IRA is the simplest option for those who want minimal paperwork.
Contributing $50,000 to retirement can save $12,000-20,000 in taxes while building your financial future. Start calculating your contribution limit today.
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