How to Open a 401(k) on Your Own When You Don't Have an Employer Plan

You can open a 401(k) without an employer through a solo 401(k), also called a self-employed 401(k)

A solo 401(k) is a retirement account designed for self-employed people and business owners with no employees (except a spouse). It works like a regular 401(k) — you contribute pre-tax money, it grows tax-deferred, and you pay taxes when you withdraw in retirement — but you set it up and manage it yourself instead of through an employer.

You open one through a financial institution like Fidelity, Charles Schwab, E-Trade, or Vanguard. The process takes about 15 to 30 minutes online. You'll need your Social Security number, business information, and a funding method. Unlike a traditional 401(k) through an employer, there's no employer match, but you can contribute more money overall because you're both the employee and the employer on paper.

A solo 401(k) is different from an SEP-IRA or a Solo Roth 401(k), which are other self-employed retirement options. This guide focuses on the solo 401(k) specifically, but knowing the alternatives helps you pick the right account for your situation.

Key Takeaways

• A solo 401(k) is available to self-employed people, freelancers, and business owners with no employees, and you open it directly with a financial institution like Fidelity or Vanguard.
• You can contribute up to $69,000 per year (for 2024) as both employee and employer, which is much higher than an IRA limit.
• The account grows tax-deferred, and you don't pay taxes on contributions or growth until you withdraw money in retirement.
• You must have self-employment income to open one, and you'll need to file paperwork with the IRS if your account balance reaches $250,000.

Who can open a solo 401(k)

You can open a solo 401(k) if you are self-employed or own a business and have no employees other than yourself (or a spouse). This includes freelancers, contractors, consultants, and people who run a side business alongside a full-time job. You must have self-employment income — money you earned from your business — to contribute.

If you have employees, you cannot use a solo 401(k). You would need a regular 401(k) plan, which requires a plan administrator and more paperwork. If you have a spouse who works in your business, they can be included in your solo 401(k), but no other employees are allowed.

You don't need to have incorporated your business or formed an LLC. A sole proprietor with a side gig can open one just as easily as someone with a formal business structure.

How much you can contribute each year

A solo 401(k) lets you contribute as both an employee and an employer, which means you can put in more money than you could with an IRA. For 2024, the employee contribution limit is $23,500 per year (or $31,000 if you're 50 or older). As the employer, you can contribute up to 25% of your net self-employment income, up to a combined total of $69,000 per year ($76,500 if you're 50 or older).

The exact amount depends on how much self-employment income you earned. If you made $50,000 in net profit, your employer contribution would be roughly $12,500, plus whatever you contribute as an employee. You don't have to contribute the maximum every year — you can contribute less or skip a year if your income is low.

These limits change each year, so check with your financial institution or the IRS website before you contribute to make sure you're within the current year's cap.

Steps to open a solo 401(k)

Start by choosing a financial institution. Major providers like Fidelity, Charles Schwab, E-Trade, Vanguard, and Merrill Edge all offer solo 401(k)s. Visit their website and look for "solo 401(k)" or "self-employed 401(k)" in their retirement accounts section. Each provider has a slightly different interface, but the basic process is the same.

Once you've chosen a provider, you'll open the account online. You'll need your Social Security number, your business name and structure (sole proprietor, LLC, S-corp, etc.), your business's Employer Identification Number (EIN) if you have one, and your net self-employment income from the previous year. If you're just starting out and have no income yet, you can still open the account — you just won't be able to contribute until you have earnings.

After you've filled out the process, you'll fund the account by transferring money from your bank account or by rolling over money from another retirement account. The account is usually active within a few business days. You can then invest the money in stocks, bonds, mutual funds, or other options your provider offers.

Tax filing requirements and important date

If your solo 401(k) balance reaches $250,000 or more at the end of any year, you must file Form 5500-SF (or Form 5500 if you have other retirement plans) with the IRS by July 31 of the following year. This is an annual filing requirement and there is a penalty for missing the important date.

You don't file anything with the IRS when you first open the account. You also don't need to file Form 5500 if your balance stays under $250,000. However, you should keep records of your contributions and account statements for your own tax records.

When you contribute money to a solo 401(k), those contributions reduce your taxable income for the year. You'll report this on your tax return. If you're unsure about the tax implications, talk to a tax professional or accountant, especially if your business structure is an S-corp or partnership.

Solo 401(k) vs. SEP-IRA vs. Solo Roth 401(k)

A SEP-IRA is simpler to set up and has less paperwork, but it has a lower contribution limit — you can contribute up to 25% of your net self-employment income, with a maximum of around $69,000 per year. The advantage is that you don't have to file Form 5500 unless your balance exceeds $250,000, and there's no annual reporting requirement. The disadvantage is that you can't make employee deferrals (the $23,500 part), so if you have low income, you might not be able to contribute as much.

A Solo Roth 401(k) works like a solo 401(k), but contributions are made with after-tax money and grow tax-free. You don't pay taxes on withdrawals in retirement. This is useful if you expect to be in a higher tax bracket later or want tax-free growth. The contribution limits are the same as a solo 401(k).

A regular IRA or Roth IRA has much lower contribution limits ($7,000 per year for 2024) and is best for people with modest self-employment income. The choice depends on your income level, how much you want to save, and whether you prefer tax deductions now or tax-free growth later.

What happens when you retire or leave your business

Once you reach age 59½, you can withdraw money from your solo 401(k) without penalty. You'll pay income tax on the withdrawal at your current tax rate. If you withdraw before 59½, you'll owe a 10% early withdrawal penalty plus income tax, unless you meet a specific exception (like disability or a hardship withdrawal).

You must start taking Required Minimum Distributions (RMDs) at age 73 (as of 2023, this age was raised from 72). The IRS calculates the minimum amount you must withdraw each year based on your account balance and life expectancy. If you don't take the RMD, you'll owe a penalty.

If you stop being self-employed or close your business, you can keep the solo 401(k) open as long as you have no employees. You can roll it over to an IRA or another retirement account if you prefer. You can also leave the money in the account and let it grow until you're ready to withdraw.

Frequently Asked Questions

Can I have a solo 401(k) and a regular 401(k) at the same time?

Yes, you can have both if you have a full-time job with an employer 401(k) and self-employment income on the side. However, your total employee deferrals across both accounts cannot exceed $23,500 per year (or $31,000 if you're 50 or older). The employer contributions to your solo 401(k) are separate and don't count toward this limit.

What if I hire an employee — do I have to close my solo 401(k)?

Yes, once you hire an employee, you can no longer use a solo 401(k). You'll need to switch to a regular 401(k) plan or another retirement plan that covers employees. You can roll over the money in your solo 401(k) to an IRA or the new plan, so you won't lose the savings.

How long does it take to open a solo 401(k)?

You can open one online in 15 to 30 minutes. The account is usually active within a few business days, and you can start contributing and investing when ready. Some providers may take longer if they need additional documentation.

Do I need a business license or EIN to open a solo 401(k)?

No, you don't need either one. If you're a sole proprietor, you can use your Social Security number. If you have an EIN, you can use that instead, but it's not required to open the account.

Can I borrow money from my solo 401(k)?

Yes, solo 401(k)s allow loans, though not all providers offer this feature. You can borrow up to 50% of your account balance, up to $50,000, and you have up to five years to repay it. If you don't repay on time, the loan is treated as a withdrawal and you'll owe taxes and penalties.