LLC Retirement Accounts: Solo 401k, SEP-IRA

LLC retirement accounts compared: Solo 401(k), SEP-IRA, and SIMPLE IRA options with contribution limits and tax benefits.

As an LLC owner, you do not have an employer-sponsored 401(k) to rely on, so you need to build your own retirement savings. Several LLC retirement accounts are designed for self-employed people, and they come with serious tax advantages. The three most common options are the Solo 401(k), the SEP-IRA, and the SIMPLE IRA. Each fits a different situation.

LLC Retirement Accounts: The Solo 401(k)

A Solo 401(k) is a retirement plan for a business owner with no employees other than a spouse. It lets you contribute in two ways: as an employee by deferring part of your earnings, and as an employer with a profit-sharing contribution. This allows higher total contributions than many other plans. Contribution limits reset annually and are set by the IRS, so check the current figures each year. A Solo 401(k) also gives you flexibility, and some providers allow loans.

The SEP-IRA

A SEP-IRA is simpler. You make employer contributions on behalf of yourself, and the contributions are based on a percentage of your net earnings, up to an annual limit that the IRS sets. SEP-IRAs are easy to set up and have no ongoing filing requirement in most cases. The downside is that contributions are limited compared with a Solo 401(k), and employees you have must generally receive contributions too. It is a good fit for owners who want minimal paperwork.

The SIMPLE IRA

A SIMPLE IRA is designed for businesses with up to 100 employees. It allows both employee salary-deferral contributions and a required employer match or contribution. If you have employees, the SIMPLE IRA can be a practical way to offer retirement benefits. Its contribution limits are generally lower than a Solo 401(k) or SEP-IRA. The right choice depends on whether you have employees and how much you want to save.

Comparing LLC Retirement Account Options

Here is how the three plans stack up at a glance:

Plan	Best for	Contributions
Solo 401(k)	Owner with no employees	Employee deferral plus employer profit-sharing, up to annual IRS limits
SEP-IRA	Owner wanting simplicity	Employer contribution based on net earnings, up to annual limit
SIMPLE IRA	Business with up to 100 employees	Employee deferral plus required employer match or contribution

Contribution limits reset annually, so confirm the current numbers with the IRS before you fund a plan.

How Contributions Affect Taxes

Contributions to these plans are generally tax-deductible, which lowers your taxable income for the year. That is a powerful way to reduce your tax bill while building savings. You can claim the deduction as a business expense, and the details appear on your LLC's tax return. For the bigger tax picture, review our LLC taxes and business tax deductions pages. If you are weighing which plan fits, check with a CPA, since the best choice depends on your income and whether you have employees. You will need an EIN number to open most of these plans.

When to Open LLC Retirement Accounts

You can open most of these plans at any time during the year, but the deadline for contributions matters. SEP-IRA contributions can generally be made up to the tax filing deadline, including extensions. Solo 401(k) employee deferrals must usually be made by the end of the calendar year, while employer contributions can come later. SIMPLE IRA contributions follow their own schedule. Because the timing rules differ, set up the plan early and confirm the contribution deadlines with your provider or a CPA.

Frequently Asked Questions

What is the difference between a Solo 401(k) and a SEP-IRA?

A Solo 401(k) lets you contribute both as an employee and as an employer, which allows higher total contributions, but it is limited to owners with no employees other than a spouse. A SEP-IRA is simpler, with employer-only contributions based on a percentage of your net earnings, and it generally has lower contribution limits. The Solo 401(k) also offers more flexibility, including the option of loans in some cases. If you have employees, the SEP-IRA requires you to contribute for them too, which can get expensive. Your choice depends on your income, your workforce, and how much you want to save.

Can an LLC owner open a Solo 401(k)?

Yes, if your LLC has no employees other than yourself, and in many cases a spouse. The Solo 401(k) is designed specifically for self-employed business owners and offers higher contribution limits through both employee and employer contributions. You set up the plan with a financial institution, and you manage the contributions yourself. Because the plan is tied to your business, you need your LLC's EIN to open it. Contribution limits reset annually and are set by the IRS, so check the current figures each year before you fund the plan.

Are retirement contributions tax-deductible for an LLC?

Generally yes. Contributions to a Solo 401(k), SEP-IRA, or SIMPLE IRA are typically tax-deductible, which lowers your taxable income for the year. The deduction is claimed as a business expense on your LLC's tax return, and it reduces the amount of income tax and self-employment tax you owe. That makes retirement contributions one of the most powerful tax strategies available to LLC owners. The exact deduction depends on the type of plan and the contribution limits in effect for the year. Check with a CPA to confirm how your contributions are treated.

Which retirement plan should an LLC owner choose?

It depends on your situation. A Solo 401(k) offers the highest contribution limits if you have no employees, making it a strong choice for solo owners. A SEP-IRA is simpler to set up and maintain, with employer-only contributions. A SIMPLE IRA works well if you have up to 100 employees and want to offer a retirement benefit. Consider your income, whether you have employees, and how much administrative work you want. Because the best choice depends on your specific numbers, it is worth checking with a CPA before you open a plan.