Sole Proprietorship Solo 401k Contributions - Solo 401k (2024)

A sole proprietorship is the most common business structure. That’s probably because it’s the easiest structure to use! A sole proprietorship means a “single owner”. As a sole proprietor, you might do business under your own name, or you could have a DBA (doing business as) fictitious business name. You might have an employer identification number (EIN) for your business, or you might use your social security number.

Once your business is generating revenue, you can start contributing to a retirement plan. The easiest way to do this is to setup a Self-directed Solo 401k plan.

Contribution Limits

The contribution limits for a Solo 401k plan are very high. You can contribute up to $69,000 per year, and $76,500 per year if you are age 50 or older. IRS Publication 560 has more information on overall plan contribution limits.

Contribution Calculations

First, determine or estimate yournet profits for the business. These will generally be reflected Schedule C of your tax return.

Then, determine your employee (salary deferral) and employer (profit sharing) contribution amounts. Use our helpful contribution calculator to determine your Solo 401k contribution for your sole proprietorship.

The maximum employee salary deferral contribution can be up to 100% of your net compensation, maxing out at $23,500 (or $31,000 if you are age 50 or older). Your employee salary deferral contribution can be pre-tax (tax-deductible) or Roth.

Your maximum profit sharing contribution may be up to 20% of your net compensation (as shown on your Schedule C).

The total contribution to your Solo 401k plan will be the aggregate of your salary deferral and profit-sharing contribution.

Contribution Deadlines

You must make the Solo 401k contributions for your sole proprietorship by the time you file your business tax return. If you filed an extension for your tax return, you have until your extension due date to deposit the contribution funds into your 401k bank or brokerage account.

Keep track of your sole proprietorship contributions by completing a Solo 401k contribution form.

Remember, you must establish your Solo 401k plan by December 31st to be able to capture contributions for that tax year. For example, your Solo 401k plan must be established by December 31, 2024 in order to deposit contributions through tax day 2025.

Make Your Contribution

Once you’re ready to deposit funds, write a check payable to your Solo 401k trust. Write “Solo 401k contribution” in the memo section of the check. Then, deposit the contribution check into your Solo 401k bank or brokerage account.

Document your Solo 401k sole proprietorship contribution on your 1040 tax return. Generally, you will note your contributions on line 28 of IRS form 1040. You only need toreport the pre-tax (traditional) solo 401k contributions. Roth contributions and voluntary after-tax contributions are not reported on Form 1040. That’s because these two types of contributions don’t reduce your taxable income and they are not tax deductible.

UPDATE:

Due to changes in the Tax Cuts and Jobs Act of 2017, individual contributions are now listed on IRS Form 1040, Schedule 1, Line 15.

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Sole Proprietorship Solo 401k Contributions - Solo 401k (2024)

FAQs

Sole Proprietorship Solo 401k Contributions - Solo 401k? ›

How much can I contribute to a Solo 401k? You can contribute up to $61,000 in 2022 and $66,000 for tax year 2023. An additional catch-up contribution of $6,500 can also be made for 2022, and $7,500 for 2023 if you are age 50 or older.

How much can I contribute to my Solo 401k as a sole proprietor? ›

A solo 401(k) is a retirement account for anyone who is self-employed or owns a business or partnership with no employees apart from a spouse. In 2024, the maximum you can contribute is $23,000 as the employee plus an additional 25% of compensation as the employer.

Does Solo 401k employer contributions reduce self-employment tax? ›

One of the more common questions we receive from self-employed business owners seeking to establish a Solo 401(k) plan is whether it can reduce self-employment tax. The short answer is no.

Can I contribute to a Solo 401k if my business has a loss? ›

Net earnings must be derived from personal services (not investment income) performed by the self-employed business owner. If the trade or business operates at a loss for the year, you will not be able to contribute to the plan.

Does a sole proprietor need an EIN for a Solo 401k? ›

Solo 401(k) Plan EIN

In general, an EIN will be acquired on behalf of the plan. The EIN is used to allow the plan to open a bank account. There is no formal requirement that an EIN be acquired for a Solo 401(k) plan since it is an owner-only plan.

Can I contribute 100% of my salary to my Solo 401k? ›

Elective deferrals up to 100% of compensation (“earned income” in the case of a self-employed individual) up to the annual contribution limit: $23,000 in 2024 ($22,500 in 2023; $20,500 in 2022; $19,500 in 2020 and 2021), or $30,000 in 2023 ($27,000 in 2022; $26,000 in 2020 and 2021) if age 50 or over; plus.

How to calculate SEP contribution for sole proprietor? ›

SEP-IRA holders are limited to contributing 25% of earned income. Earned income is calculated by taking the net profit of the business and deducting both one-half of the self-employment tax assessed on it as well as any tax-deductible contributions made to the SEP-IRA for the account holder.

What is the downside of a Solo 401k? ›

There is a downside, however, since setting up and managing the plan is usually a bit more intensive. You'll have to file a special form with the IRS each year if your account balance exceeds $250,000, and you may find that the fees are somewhat higher than what you'd pay for an IRA.

Do Solo 401k contributions have to come from payroll? ›

Therefore, you can make both your employee and profit sharing contributions to the solo 401k plan based on your W-2 wages since your self-employed business is and LLC taxed as an S-corp.

Do Solo 401k contributions reduce AGI? ›

The Bottom Line. A 401(k) retirement plan will reduce both your AGI and MAGI, as contributions are taken out of your salary before taxes are deducted. This in effect reduces your salary in relation to taxes.

How to report Solo 401k contributions on tax return? ›

It acts and is treated like any other 401(k) plan. Essentially, this plan has the sole owner and sole employee making contributions to the same one plan. This means you will report the total amount (as sole owner and sole employee) contributed as an adjustment on Schedule 1, line 16.

Can a Solo 401k be sued? ›

Differences at the state level determine when IRAs are fair game for lawsuits. The fact is that many states don't protect IRAs nearly as well. Even though the Solo 401k doesn't generally qualify under Title I of ERISA, it often offers more from lawsuits and bankruptcy courts.

How much can a self-employed person contribute to a 401k? ›

401(k) plan

Contribute up to an additional 25% of your net earnings from self-employment for total contributions of $69,000 for 2024 ($66,000 for 2023, $61,000 for 2022; $58,000 for 2021; $57,000 for 2020 and $56,000 for 2019), including salary deferrals.

Are Solo 401k contributions subject to self-employment tax? ›

They're not limited to 25 percent of their salary, as in some other plans. This feature can allow them to minimize taxes, though this contribution doesn't help them avoid the self-employment tax. In other respects, the solo 401(k) operates like any other 401(k) plan, whether it's a traditional 401(k) or a Roth 401(k).

What is the difference between Solo 401k sole proprietor and S-Corp? ›

An S-Corp Solo 401k is much more efficient than one in a sole prop. This is because of how the maximum contribution is calculated. Let's look at an example of each starting with the same amount of net income and see how it differs.

Can I administer my own Solo 401k? ›

Because you are allowed to be your own plan administrator with the Solo 401k plan, there is no need for the expense or bureaucratic burden of an outside administrator.

Can I make a lump sum contribution to my solo 401k? ›

Periodic or Lump Sum: Solo 401k contributions can be made periodically or in one lump sum.

Can I contribute to solo 401k outside of payroll? ›

You can write a check directly from your personal or business checking account to the solo 401k account. This is probably the most common way for business owners to fund their solo 401k outside of payroll.

What is the downside of a solo 401k? ›

There is a downside, however, since setting up and managing the plan is usually a bit more intensive. You'll have to file a special form with the IRS each year if your account balance exceeds $250,000, and you may find that the fees are somewhat higher than what you'd pay for an IRA.

Can you invest in a solo 401k in a business? ›

(1) Yes the IRS solo 401k rules allow for investing in a private company (private equity) provided that (i) the solo 401k owner / participant (nor any closed related persons) are not working for the entity in which she intends to invest retirement funds; (ii) the solo 401k owner / participant (nor any closed related ...

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