Retirement Plans for Truckers: SEP-IRA, Solo 401(k), and Defined Benefit Options

Most owner-operators don’t have a retirement plan. They know they should, the way they know they should eat better on the road, but the variable income, the cash-flow pressure, and the lack of an employer match make it easy to put off. That’s a problem, because the tax code offers self-employed truckers some of the most generous retirement shelters available to anyone. A well-chosen plan doesn’t just build a retirement fund. It cuts your current-year tax bill by tens of thousands of dollars, and for high earners, six figures. The money you contribute comes off the top of your taxable income, and it grows tax-deferred until you withdraw it. If you’re netting $100,000 or more and you’re not contributing to a retirement plan, you’re voluntarily paying more tax than you owe.

Why do truckers under-save for retirement?

The reasons are structural, not personal. Owner-operators deal with income that swings from month to month depending on freight rates, fuel costs, breakdowns, and seasonal demand. When you don’t know whether next quarter’s net will be $25,000 or $5,000, committing to a fixed retirement contribution feels risky. There’s no employer putting money in for you. And the cash sitting in the business account always seems like it should go toward a truck payment, a new set of tires, or the next insurance premium.

The result is that a lot of owner-operators reach their 50s with a paid-off truck and not much else. The truck depreciates. The body wears out. And the math on Social Security alone (assuming they’ve been paying self-employment tax, which funds Social Security) doesn’t add up to a comfortable retirement. The average monthly Social Security benefit for a retired worker in 2026 is around $1,900. That’s $22,800 a year. If you’ve been driving for 25 years and putting away nothing beyond SE tax, that’s what you’re looking at.

The good news is that the tax code gives self-employed people access to retirement plans that are, in some respects, more flexible than what W-2 employees get. You can contribute as both the employer and the employee. You can choose the plan type that matches your income level and goals. And you can make contributions as late as your tax filing deadline (including extensions), which means you can wait until you know your actual income for the year before deciding how much to contribute.

How does the SEP-IRA work for owner-operators?

The Simplified Employee Pension (SEP-IRA) is the easiest retirement plan to set up and administer. You can establish one by filling out IRS Form 5305-SEP (a two-page document), opening an account at any brokerage, and making a contribution. There’s no annual filing requirement (no Form 5500), no plan document beyond the form, and no ongoing administration cost. For an owner-operator who wants a retirement plan with minimal paperwork, the SEP is hard to beat on simplicity.

Contributions to a SEP-IRA are employer-only. You contribute as the business owner, not as an employee. The limit for 2026 is 25% of W-2 compensation (for S-Corps) or approximately 20% of net self-employment income (for sole proprietors, after the deduction for one-half of self-employment tax), up to a maximum of $72,000 under IRC 408(k). The 20% effective rate for sole props comes from the circular calculation: the contribution is itself a deduction that reduces the income the percentage is calculated on.

The SEP’s deadline is generous. You can establish and fund a SEP-IRA as late as the due date of your tax return, including extensions. For a sole proprietor filing on extension, that’s October 15. For an S-Corp on extension, September 15. This means you can wait until you’ve prepared (or had your CPA prepare) your return, see your actual net income, and then decide how much to contribute.

The SEP’s weakness shows up at lower income levels. Because it’s employer-only contributions at approximately 20% of net self-employment income, a sole proprietor netting $60,000 can only contribute about $12,000. A Solo 401(k), by contrast, allows an employee deferral of $24,500 (2026) on top of the employer contribution, so the same $60,000 earner could shelter significantly more.

Why does the Solo 401(k) often beat the SEP?

The Solo 401(k), also called the individual 401(k) or one-participant 401(k), is available to self-employed individuals with no full-time employees other than a spouse. It has two contribution components, and that’s where the advantage comes from.

The first component is the employee elective deferral. For 2026, you can defer up to $24,500 of your earnings, or $32,500 if you’re age 50 or older (the $8,000 catch-up contribution under IRC 414(v)). For ages 60 to 63, there’s a super catch-up that pushes the deferral limit to $35,750. This deferral is dollar-for-dollar, meaning it doesn’t depend on a percentage of income. If you net $30,000, you can still defer up to $24,500 (limited to your actual earnings).

The second component is the employer profit-sharing contribution. This works the same as the SEP: up to 25% of W-2 compensation (S-Corp) or approximately 20% of net self-employment income (sole prop), subject to the same calculation.

The combined limit for 2026 is $72,000 ($80,000 with the standard age-50 catch-up, $83,250 with the ages 60 to 63 super catch-up). That’s the same maximum as the SEP-IRA, but the Solo 401(k) lets you reach it at a much lower income level because of the employee deferral component.

The Solo 401(k) also offers features the SEP doesn’t. You can designate your employee deferral as a Roth contribution (after-tax dollars, tax-free growth and withdrawal). You can borrow from your Solo 401(k), up to 50% of the vested balance or $50,000, whichever is less. And if you’re an S-Corp owner paying yourself a salary, you can make both the employee deferral (from salary) and the employer profit-sharing contribution (from the corporation), which is a powerful combination.

The trade-off is slightly more administrative complexity. You need a plan document (available from most brokerages for free), and once the plan’s assets exceed $250,000, you’re required to file Form 5500-EZ annually. But the paperwork is minimal compared to the tax savings, especially for truckers in the $60,000 to $150,000 net income range where the employee deferral component makes the biggest difference.

The deadline for establishing a Solo 401(k) is December 31 of the tax year (the plan must be in place by year-end, even though contributions can be made until the filing deadline). This is earlier than the SEP’s deadline, so if you’re setting one up for the current year, don’t wait until tax time.

When does a defined benefit plan make sense?

Defined benefit plans are the heavy artillery of retirement tax sheltering. They’re actuarially determined, which means the annual contribution is calculated based on your age, income, and the target retirement benefit the plan is designed to provide. For an owner-operator over 50 with consistent income above $200,000, a defined benefit plan can allow contributions of $200,000 or more per year, far exceeding the $72,000 cap on SEP and Solo 401(k) plans.

The logic works like this: a defined benefit plan promises a specific retirement benefit (a monthly payment starting at retirement age). The actuary calculates how much needs to be contributed each year to fund that benefit, based on age, years to retirement, and assumed investment returns. The older you are and the higher your target benefit, the larger the required annual contribution. A 55-year-old planning to retire at 65 needs to fund 10 years of contributions. A 45-year-old with the same target has 20 years, so each annual contribution is smaller. That’s why defined benefit plans are most powerful for older, high-earning owner-operators.

The contribution is deductible under IRC 404(a), reducing taxable income just like a SEP or Solo 401(k) contribution. The money grows tax-deferred. At retirement, distributions are taxed as ordinary income, just like any other qualified plan.

The catch is commitment. A defined benefit plan requires annual contributions that are actuarially determined, and they’re not optional. If your income drops in a year and you can’t make the required contribution, you face excise taxes and potential plan disqualification. This makes defined benefit plans inappropriate for truckers with volatile, unpredictable income. They work best for owner-operators or fleet owners with a track record of consistent high earnings and confidence that the income will continue for several more years.

The administration cost is higher too. You’ll need an actuary to calculate annual contributions and a third-party administrator (TPA) to maintain the plan. Annual costs run $2,000 to $4,000, plus the actuary’s fee. For someone sheltering $150,000 or more per year, the administration cost is trivial relative to the tax savings.

You can also combine a defined benefit plan with a Solo 401(k). The Solo 401(k) handles the first $72,000 (or more with catch-up), and the defined benefit plan shelters the additional amount above that. For a 58-year-old owner-operator netting $350,000, the combined structure can shelter $250,000 or more in a single year.

What if I have employees?

The plan choice changes when you have W-2 employees beyond a spouse. The Solo 401(k) is off the table, because it’s limited to businesses with no full-time employees other than the owner and their spouse. Once you hire a driver, a mechanic, or an office manager, you need a different structure.

The SEP-IRA is the simplest option for a fleet owner with employees, but there’s a catch: the employer contribution percentage must be the same for all eligible employees. If you contribute the effective 20% of net SE income for yourself, you must contribute 25% of pay for every eligible employee. Eligible employees are generally those who are at least 21 years old, have worked for you in at least three of the last five years, and earned at least $750 in the current year. For a fleet owner with several drivers, the cost of matching your own contribution rate across the workforce can be substantial.

A SIMPLE IRA is a middle-ground option. It allows employee deferrals of up to $16,500 in 2026 ($20,000 with catch-up for age 50 and over) and requires the employer to either match employee contributions dollar-for-dollar up to 3% of compensation or make a flat 2% contribution for all eligible employees. The contribution limits are lower than a SEP or Solo 401(k), but the employer cost is more predictable and often lower. SIMPLE IRAs are available to businesses with 100 or fewer employees.

A traditional 401(k) plan (not the solo version) is the most flexible option for fleet owners with employees. It allows employee deferrals, employer matching, profit-sharing contributions, and vesting schedules. The administration is more complex and more expensive (plan document, annual Form 5500 filing, nondiscrimination testing), but it gives the fleet owner the most control over contribution design.

For a detailed look at how entity structure affects these calculations, see the entity structure guide for trucking.

How do retirement contributions affect SE tax?

This is a point that trips people up. For sole proprietors, retirement plan contributions reduce your income tax but they do not reduce your self-employment tax. Self-employment tax under IRC 1401 is calculated on your net self-employment earnings (Schedule C profit x 92.35%), and retirement contributions don’t come off before that calculation. You get the income tax deduction on Schedule 1, but your SE tax base is unchanged.

The math: if you net $100,000 on Schedule C and contribute $20,000 to a Solo 401(k), your income tax is calculated on roughly $80,000 (after the contribution deduction and other adjustments). But your self-employment tax is still calculated on $100,000 x 92.35% = $92,350. The SE tax (15.3% on the first $168,600 of net SE earnings) runs about $14,130 regardless of the retirement contribution.

This is where the S-Corp structure creates an additional benefit. If you operate as an S-Corp and pay yourself a W-2 salary of $70,000, your FICA taxes (the payroll equivalent of self-employment tax) are calculated on the $70,000 salary, not the full profit. The remaining profit passes through as a distribution, which isn’t subject to FICA. When the S-Corp then makes an employer retirement contribution on your salary, that contribution is a deductible business expense that reduces the corporation’s taxable income, and it’s not subject to FICA on either end. The result is that the S-Corp owner gets the retirement deduction and the payroll tax savings simultaneously.

For owner-operators netting $80,000 or more, the combination of an S-Corp election and a retirement plan often produces the lowest total tax bill. The S-Corp election reduces self-employment tax, and the retirement contribution reduces income tax. Both are well-established, IRS-approved strategies. The key constraint is setting reasonable compensation for the S-Corp salary, which for owner-operators typically falls in the $45,000 to $150,000 range depending on the type of work, hours, and local market rates.

For more on the S-Corp calculation and the reasonable compensation analysis, see the owner-operator deductions guide.

What should I do next?

If you don’t have a retirement plan, start with the Solo 401(k). It’s the most flexible option for owner-operators, and the employee deferral component means you can shelter meaningful dollars even at moderate income levels. If your income is above $200,000 and you’re over 50, talk to a CPA about whether a defined benefit plan makes sense on top of it.

If you already have a SEP-IRA and you’re not maxing it out, check whether a Solo 401(k) would let you contribute more at your income level. The switch is straightforward (you can roll the SEP balance into the Solo 401(k)), and the administrative burden is minimal.

These related guides cover the topics that interact with retirement planning:

• Owner-operator tax deductions, the full deduction list that determines your net income (and therefore your contribution capacity)
• Entity structure: LLC, S-Corp, and fleet owners, how the S-Corp election reduces payroll taxes and affects retirement plan contributions
• Per diem and meal deductions, the DOT per diem rules that reduce taxable income before you even get to retirement contributions
• Vehicle depreciation and Section 179, the accelerated depreciation options for the truck itself
• Freight broker and 1099 classification, why independent contractor status matters for plan eligibility

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.