Solo 401k vs SEP IRA for Seattle Self Employed

“`html

Solo 401k vs SEP IRA — A Real Comparison for Seattle Self-Employed

I’ve spent the last eight years helping Seattle freelancers and tech consultants navigate retirement account decisions, and honestly, this is the question I hear most often. You’re self-employed, making decent money, and you know you need to save for retirement — at least if you want to avoid scrambling at 65. But should you open a Solo 401k or a SEP IRA? Both sound similar. Both let you stash pre-tax money. The difference, especially for someone in Washington state, can mean tens of thousands of dollars in contribution room and headaches you don’t anticipate until it’s too late.

Most people search “solo 401k vs sep ira for seattle self employed” when they’re standing at a decision point — applications open, deadline looming, and they need to know which account actually wins. This isn’t abstract retirement planning. This is tactical money strategy for consultants billing $150k annually, freelancers reinvesting income, and small business owners trying to optimize before December 31st.

So, without further ado, let me walk you through the real numbers and skip the generic explanations.

Solo 401k vs SEP IRA Quick Comparison Table

Solo 401k — How Much Can You Actually Contribute

Let’s use a real scenario. You’re a Seattle tech consultant with $120,000 in net self-employment income. Solo proprietor. No employees. No plans to hire anyone.

Here’s how the Solo 401k math actually works:

1. Employee deferral: You contribute $23,500 (2024 limit) directly from your salary. This is withheld from your own paycheck equivalent.
2. Employer contribution: As the employer, you contribute roughly 25% of your net self-employment income after the self-employment tax deduction. For a $120,000 net income, that self-employment tax is about $16,956. You deduct half ($8,478) from your income, leaving $111,522. Your employer contribution is approximately 20% of that: $22,304.
3. Total: $23,500 + $22,304 = $45,804 into your Solo 401k for the year.

The self-employment tax deduction is critical — at least if you want to avoid overstating your contribution room. Most articles gloss over it. That deduction reduces your income subject to self-employment tax, which cascades into how your employer contribution gets calculated. Don’t make my mistake. I see self-employed people miss this and think they can contribute more than they actually can.

The real advantage emerges if cash gets tight. You can borrow $22,902 (50% of your $45,804 balance) and repay it over five years. That’s not a taxable withdrawal. That’s not a penalty. That’s emergency liquidity inside a retirement account — something you can’t do with a SEP IRA.

SEP IRA — The Simpler Alternative and When It Wins

A SEP IRA contribution is beautifully straightforward. You contribute approximately 25% of net self-employment income (after SE tax deduction). Same $120,000 net income example: 25% of $111,522 = $27,880 annual contribution limit.

Wait. That’s higher than the Solo 401k example above. Why?

The Solo 401k limits you to the employee deferral ($23,500) plus employer contributions. The SEP allows you to contribute up to 25% of net income with no separate employee deferral bucket. Depending on your income level, a SEP can actually be more generous — the math just depends on where you land.

The filing burden disappears. No Form 5500-C. No annual compliance paperwork. You open the account at Fidelity, Charles Schwab, or Vanguard, fund it by your tax filing deadline (usually October 15th with an extension), and you’re finished. The contribution amount goes on your 1040. That’s it.

The SEP IRA truly dominates in one scenario: you plan to hire employees in the near future. With a Solo 401k, the moment you bring on staff, you’re obligated to offer the plan to them. You must run nondiscrimination testing annually. You must file Form 5500-C. The admin burden explodes — and that’s where most people get blindsided.

With a SEP IRA, you simply contribute the same percentage (25%) for any employee who meets the eligibility requirements (typically worked for you at least three of the past five years). No testing. No form 5500. The contribution is mandatory but uniform and simple.

The Hidden Cost Most Seattle Consultants Miss

Here’s what blindsides people.

You start as a solo consultant. You open a Solo 401k because the contribution limit looked higher on the spreadsheet. Three years later, business is good. You hire a contractor who becomes an employee. Suddenly your Solo 401k isn’t solo anymore.

That’s when things get expensive. Now you need compliance testing. You need a payroll provider that understands 401k administration. You need annual audits to ensure your plan doesn’t discriminate — highly compensated employees get too much while rank-and-file employees get too little. You need to file a 5500-C form with the Department of Labor. A single mistake triggers IRS penalties.

This admin layer costs between $1,500 and $3,000 annually in Seattle’s market. Fidelity, Guideline, and Guidepoint all price this into their Solo 401k packages once employees are involved. It’s not optional. It’s just the cost of running a 401k with staff.

A SEP IRA sidesteps this entirely. Employee gets hired. You contribute 25% of their compensation to their SEP IRA. No testing, no 5500, no payroll integration headaches. The simplicity compounds over years, and you avoid thousands in compliance costs.

Which Plan Should You Open Before Year End

Here’s the decision tree:

Scenario 1: Solo, no employees, zero intention to hire

Open the Solo 401k. The contribution room is generous. The loan option is real leverage if you ever need emergency cash. Investment choices are broader at most institutions. You’ll benefit for years before the complexity question even arises. Deadline: December 31st, 2024 for 2024 contributions.

Scenario 2: You want simplicity above all else

Open the SEP IRA. No forms beyond your 1040. No annual compliance. Contributions deadline is your tax filing deadline (typically October 15th, 2025 for 2024 taxes if you file an extension), giving you months to plan. The SEP contribution limit is often competitive anyway, especially at lower income levels.

Scenario 3: You plan to hire within the next two years

Open the SEP IRA now. You avoid retrofitting a Solo 401k into an employee plan later. When you hire, the SEP simply scales. You’re already in the simpler system. Deadline: October 15th, 2025 for contributions to your 2024 SEP IRA.

The filing deadline difference matters. A Solo 401k must be established by December 31st of the contribution year. A SEP IRA can be opened as late as your tax filing deadline (with extension, October 15th of the following year). If we’re already in December, a SEP IRA buys you months to decide and fund.

For most Seattle self-employed people I’ve worked with — especially tech consultants and freelancers — the SEP IRA wins on simplicity and future-proofing. The Solo 401k wins on maximum contribution room and liquidity. Neither choice is wrong. But one usually fits your actual situation better than the math alone suggests.

“`