SEP IRA

A SEP IRA lets self-employed individuals and small business owners contribute up to 25% of net self-employment earnings (or W-2 compensation), capped at $69,000 for 2024.

Why people use it

• Much higher contribution limit than a Traditional IRA.
• No annual filing requirements (unlike a Solo 401(k) above $250k in assets).
• Funded entirely by the employer — contributions are tax-deductible to the business.
• Easy to open at any major brokerage in 15 minutes.

SEP vs. Solo 401(k) — the high-earner question

For sole proprietors with high income, a Solo 401(k) usually allows larger contributions because it adds an employee deferral on top of the employer match. A SEP is simpler but caps out faster. If you have or anticipate employees, the SEP's "same percentage for everyone" rule can get expensive.

The math for a self-employed earner

A self-employed consultant nets $100,000/year. With a SEP IRA, they can contribute up to 25% of net self-employment earnings (after the deduction for self-employment tax), which works out to roughly $18,587 in 2024. Compare to a Solo 401(k) for the same income: $23,000 employee deferral + $18,587 employer = $41,587. The Solo 401(k) doubles the SEP contribution capacity at typical income levels.

When the SEP IRA still wins

• Late-year setup. You can establish and fund a SEP IRA up until your tax filing deadline (including extensions, so as late as October 15). A Solo 401(k) generally must be established by December 31 of the contribution year.
• Genuinely irregular income. Contribution percentages are flexible year to year. A bad year means contributing nothing without penalty.
• Multi-employee small business. SEP simplicity beats Solo 401(k)'s individual-only restriction.
• No payroll setup. SEP IRAs don't require formal payroll the way Solo 401(k)s do for some contribution types.

The contribution math (the part that confuses people)

SEP IRA contribution limit is technically 25% of compensation — but "compensation" for the self-employed means net earnings after the self-employment tax deduction. The effective rate is closer to 18.59% of net schedule C income. The IRS has worksheets in Publication 560.

Rule of thumb: take net SE income, multiply by 0.1859 to get max SEP contribution. $200,000 net → about $37,000 SEP contribution.

Why SEP balances complicate backdoor Roth

The Backdoor Roth IRA requires no existing pre-tax IRA balances to avoid the pro-rata rule. SEP IRA balances count toward the pro-rata calculation. High-earning self-employed who want both SEP contributions AND backdoor Roth often switch to Solo 401(k) — which doesn't count for pro-rata — to get the best of both worlds.

Common SEP IRA mistakes

• Using the SEP at peak income when Solo 401(k) would beat it. If you have no employees and high income, run the math — Solo 401(k) almost always allows more.
• Forgetting the deadline. SEP IRA contributions for tax year 2024 can be made up to October 15, 2025 (with extension) — but only if you don't forget.
• Mixing personal and SEP IRAs at the same broker. Easy to accidentally contribute to the wrong one. Use clearly labeled separate accounts.
• Not contributing for employees. If you have employees, SEP requires the same percentage contribution for everyone. Some business owners contribute themselves but skip employee contributions — illegal and discovered in audits.

Frequently asked questions

Can I have a SEP IRA and a regular IRA?

Yes. You can also have both a SEP IRA from self-employment and a 401(k) from W-2 work. Just respect the individual contribution limits of each.

Are SEP contributions tax-deductible?

Yes, fully deductible as a business expense. Reduces self-employment tax and federal/state income tax in the contribution year.

Can I convert SEP IRA to Roth?

Yes. Same mechanics as Traditional IRA conversion. Pay tax on the conversion in the year it happens. Often done in low-income years to fill up lower tax brackets.

What if my business loses money this year?

You contribute nothing — no penalty, no requirement. SEP flexibility shines in lean years.

Putting this into practice this week

Concepts only matter if they change behavior. Pick the single most relevant action from the above and put it on your calendar — even 15 minutes of action beats hours of further reading without doing anything. The compound benefit of small consistent moves dwarfs the optimization gain from any single decision. Most people fail at finance not because they don't know what to do, but because they don't act on what they already know.

How this connects to the rest of your financial plan

Personal finance is a system, not a list of independent decisions. The choices you make in one area cascade into others: a tax-loss harvest affects your asset allocation, a 401(k) contribution affects your near-term cash flow, a Roth conversion in 2024 affects RMDs in 2050. Sophisticated financial planning is mostly about understanding these second- and third-order effects. The basics that everyone should master first: emergency fund in cash, capture the full 401(k) match, eliminate high-interest debt, max tax-advantaged accounts before taxable, write down a single-page financial plan and review it annually.

Key takeaways

• Understand the mechanics before you optimize the edges. A solid 70% strategy beats a fragile 95% optimization.
• Automate behavior so you don't depend on willpower. Set-it-and-forget-it is the highest-leverage financial habit.
• Match the strategy to your actual situation, not the situation you wish you had or that influencers describe.
• Review annually; ignore daily noise. The market's short-term moves rarely require a response.
• Consistency over decades beats brilliance over months. Time in the market does the work; trying to time it usually destroys it.

The bottom line

The biggest financial wins come from doing the simple things consistently for decades — not from finding the cleverest single trick. Build the foundation first; the optimizations layer on top once the foundation is solid. The investors who end up wealthy aren't the ones who picked the best stocks. They're the ones who saved consistently, kept costs low, took appropriate risk for their horizon, and didn't sell during crashes. Everything else is detail.

Continue your learning at Krovea

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A final note on financial decision-making

Every concept covered here exists because someone made a costly mistake first and the rule emerged from the consequences. The 401(k) match exists because Americans weren't saving enough. The Roth IRA exists because mid-century retirees got taxed twice on their nest eggs. The wash-sale rule exists because traders abused loss harvesting. Treat each piece of advice not as arbitrary rules to memorize but as the encoded lessons of prior generations of investors. The framework that survives recessions, regulatory changes, and market manias has been stress-tested in ways no individual could replicate. Following the boring conventional wisdom isn't unimaginative — it's the result of selecting for what actually works at scale.