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When you don’t have an employer contributing to a workplace plan, retirement planning presents a unique challenge. As a freelancer, contractor, consultant, or business owner, saving for the future is entirely up to you—and it isn’t always automatic. Year-to-year income fluctuations can make consistent saving even trickier.
Two of the most popular options for self-employed individuals are the Solo 401(k) and the SEP IRA. Both offer valuable tax savings and help you build a nest egg, but they operate differently. The right choice for you depends on your income, business structure, employee status, contribution goals, fees, and provider offerings.
Can Self-Employed Workers Open a Solo 401(k) or SEP IRA?
Most self-employed workers can establish either type of account, provided they meet specific requirements. A Solo 401(k) is designed for business owners who have no full-time employees other than a spouse. A SEP IRA can be set up by various business types, though hiring eligible employees introduces additional employer obligations.
Solo 401(k) vs. SEP IRA: What’s the Difference?
A Solo 401(k) allows you to contribute in two capacities: as both employee and employer. This structure offers self-employed workers significant flexibility to scale contributions based on annual income. A SEP IRA relies solely on employer contributions calculated from eligible compensation; while simpler to administer, it lacks the employee contribution component.
Contribution flexibility is a major differentiator. A Solo 401(k) may offer both traditional and Roth options (where available). Traditional contributions reduce your current taxable income, whereas Roth contributions are made with after-tax dollars, allowing for tax-free withdrawals in retirement.
Read: Solo 401(k) for Freelancers: Setup and Funding Tips
How to Set Up a Solo 401(k)
Confirm Your Eligibility
First, verify that your business meets the eligibility criteria for a Solo 401(k). Generally, you cannot have any full-time employees other than a spouse. You must also understand how your business structure and net self-employment income influence plan limits.
Choose a Financial Institution
Compare providers based on account fees, investment selection, platform features, and availability of traditional or Roth options. While low fees compound into substantial savings over time, intuitive account management tools and robust investment choices are equally crucial. The cheapest provider isn’t always the best fit.
Open and Establish the Account
Setting up the account requires formal plan documentation. Keep key deadlines in mind, especially if you are establishing the account near the end of the tax year. Retain copies of all plan documents and familiarize yourself with ongoing administrative requirements.
Calculate Your Contributions
Solo 401(k) contributions combine employee elective deferrals and employer profit-sharing contributions. Use your net self-employment earnings to calculate your maximum allowance. Because annual IRS limits change frequently, always verify current-year figures rather than reusing past calculations.
Choose Your Investments
After opening your account, select investments from your provider’s available lineup. Your asset allocation should align with your retirement timeline, risk tolerance, and long-term financial strategy.
Read: 401(k) Plans for Small Business Owners and Solo Entrepreneurs
How to Set Up a SEP IRA
Confirm Your Business Eligibility
Most self-employed individuals and small business owners qualify for a SEP IRA. However, if you employ eligible staff, you must contribute an equal percentage of compensation to their accounts whenever you contribute to your own. Determine these coverage requirements before opening the plan.
Select a Provider
Evaluate financial institutions on account fees, investment choices, digital interface, and customer support. Reviewing these factors upfront prevents unwelcome surprises down the road.
Establish the SEP IRA
To establish the plan, complete the required adoption agreement (such as IRS Form 5305-SEP or a prototype plan document). Although a SEP IRA requires less ongoing paperwork than a Solo 401(k), maintaining proper documentation remains essential.
Calculate Your Contribution
SEP IRA contributions are calculated as a percentage of net eligible compensation (up to annual IRS maximums). Because variable business earnings alter your contribution capacity each year, recalculate your ceiling annually.
Solo 401(k) vs. SEP IRA: Which One Is Better for You?
Choose a Solo 401(k) If You Want More Contribution Flexibility
A Solo 401(k) is ideal if you want to maximize contributions at lower income levels by contributing as both employee and employer. This dual capacity offers finer control over your savings rate, making it especially advantageous when annual revenue fluctuates.
Consider a SEP IRA for Simpler Administration
A SEP IRA works well if you prefer minimal paperwork and effortless administration. It is straightforward to maintain, making it a strong choice for business owners who do not need employee deferral features.
Think About Roth Contributions
If your Solo 401(k) provider offers a Roth feature, consider whether paying taxes today in exchange for tax-free growth and withdrawals later fits your financial strategy. Evaluate your current tax bracket against your expected bracket in retirement.
Consider Whether You Have Employees
Your workforce composition dictates your options. A Solo 401(k) is restricted to owner-only businesses (and spouses). If you have or plan to hire non-spouse employees, a SEP IRA (or traditional 401(k)) is necessary, along with equal contribution requirements for eligible staff.
Compare Fees and Investment Options
High account fees silently erode investment returns over time. Compare expense ratios, maintenance fees, and transaction charges alongside available investment products before committing to a financial institution.
Read: Why Millennials and Gen Z Shouldn’t Ignore Their 401(k)s
How Much Should You Contribute to Your Self-Employed Retirement Plan?
Start by targeting a comfortable percentage of your net business income—one that doesn’t strain operational cash flow. Consistent savings habits often yield better long-term results than attempting irregular, maximum-limit contributions.
In higher-earning years, capitalize on increased contribution room. However, prioritize maintaining an emergency fund and liquid business reserves. A robust retirement account should not leave your business vulnerable to short-term cash crunches.
Tax Benefits and Considerations for Self-Employed Retirement Accounts
Traditional contributions reduce your current taxable income dollar-for-dollar (up to annual limits). Earnings grow tax-deferred, meaning you won’t pay income tax on dividends or capital gains until you withdraw the funds in retirement.
Roth contributions are funded with after-tax income, so they offer no immediate tax deduction. However, both your principal and investment growth can be withdrawn in full, tax-free in retirement, provided the qualifications are met.
Common Mistakes to Avoid When Setting Up a Solo 401(k) or SEP IRA
Common pitfalls include choosing a provider without evaluating underlying expense ratios, failing to meet end-of-year plan setup deadlines, and overlooking IRS contribution limits.
Miscalculating net self-employment earnings can lead to excess contributions and IRS penalties. Additionally, failing to extend SEP IRA benefits to eligible employees can jeopardize your plan’s tax status.
Read: Premium Tax Credits Explained Plainly for Self-Employed Filers
A Step-by-Step Retirement Plan for Self-Employed Workers
Step 1: Estimate Your Annual Business Income
Project your net self-employment income for the year, updating your estimates periodically as revenue fluctuates.
Step 2: Build an Emergency Fund
Maintain 3 to 6 months of liquid cash in a business emergency fund to cover lean months without tapping retirement accounts early.
Step 3: Review Your Business Structure
Confirm whether you operate as a sole proprietorship, LLC, S Corp, or C Corp, as your entity type affects contribution math and deadlines.
Step 4: Compare Solo 401(k) and SEP IRA Options
Weigh the higher contribution capacity of a Solo 401(k) against the administrative simplicity of a SEP IRA.
Step 5: Choose a Financial Institution
Select a brokerage based on low expense ratios, robust investment selections, and user-friendly administrative tools.
Step 6: Open and Establish Your Account
Complete the required adoption agreements and retain copies of plan documents for tax reporting.
Step 7: Calculate Your Contribution
Determine your maximum allowed contribution using current IRS worksheets or standard tax software.
Step 8: Select Appropriate Investments
Allocate your funds across low-cost index funds, ETFs, or target-date funds that align with your risk tolerance and time horizon.
Step 9: Automate Contributions When Possible
Set up recurring monthly or quarterly transfers to ensure disciplined, continuous saving regardless of workload.
Step 10: Review Your Retirement Strategy Every Year
Revisit your contribution rate, asset allocation, and plan suitability at tax time each year.
Read: First Year of Self-Employment: Money Moves That Save Real Tax Dollars
Frequently Asked Questions
Can I have a Solo 401(k) and a SEP IRA at the same time?
Yes, you can maintain both accounts, but total contribution limits across all plans are subject to IRS aggregation rules. Consult a tax professional before funding both in the same tax year.
Is a Solo 401(k) or SEP IRA better for self-employed workers?
Neither is inherently superior. A Solo 401(k) is ideal for maximizing savings at lower income levels and offering Roth options. At the same time, a SEP IRA excels in administrative ease and flexibility for businesses that may hire employees.
How much can I contribute to a Solo 401(k) or SEP IRA?
Contribution caps are set annually by the IRS. Solo 401(k) limits include employee deferrals plus employer contributions, while SEP IRA limits are capped at a fixed percentage of net compensation up to the annual limit.
Can I open a Solo 401(k) if I have employees?
No. These plans are restricted to owner-only businesses (and working spouses). If you employ full-time, non-owner staff, you must transition to a standard 401(k) or utilize a SEP IRA.
When should I open a retirement account as a self-employed worker?
The earlier you start, the more your money benefits from compound growth. However, ensure you have established a stable business cash flow and an emergency fund before locking funds into a retirement plan.
Final Thoughts: Start Building Your Retirement Plan Early
Self-employed workers don’t need an employer-sponsored plan to build significant wealth. Whether you choose the high contribution limits of a Solo 401(k) or the streamlined administration of a SEP IRA, taking action early is key.
Evaluate your options based on eligibility, annual revenue, employee plans, and tax strategy. Reassess your choice annually as your business grows, and consult a CPA or financial advisor to optimize your plan setup.
Beem can support your overall budgeting and financial planning. Review your benefits and savings options today to maximize your household savings. Download the app now.
