Single(k)®: An Affordable and Easy to Manage Solo 401(k) Plan

Contribute up to 3x more than an IRA with all the advantages of a big business 401(k).

  • Personalize your investment options via a self-directed brokerage account at the financial institution of your choice
  • Opportunity for tax savings with traditional pre-tax and Roth contributions
  • Option to take a loan against retirement savings account
Find Your Solo 401(k) Plan

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The solo 401(k) plan – often termed the single 401(k), individual 401(k) plans, or solo(k) – is for business owners without full-time employees (with the exception of a business partner or spouse).

How Does a Single(k)® Plan Work?

One of Ubiquity’s solo 401(k) plan offerings, Single(k), offers a unique path for self-employed professionals to secure their future retirement.

The plan allows business owners to set aside more money for retirement compared to other individual retirement savings plan options, like a traditional or Roth IRA.

It combines the features of a group 401(k) and a profit-sharing plan, enabling business owners to act both as the employee and employer.

This plan is an exceptional alternative to other retirement-investing avenues for sole proprietors, consultants, freelancers, and any business owner operating without full-time staff.

Check out our Single(k) FAQs to learn more

Who Should Consider a Single(k) Plan?

  • C Corp, S Corp, LLC, and DBA
  • Independent contractors
  • Freelancers
  • Sole proprietorship businesses

Plan Benefits

  • Higher contributions limits than IRAs
  • Business tax deduction for plan contributions and plan expenses
  • Reduced taxable income for pre-tax salary contributions
  • Low maintenance plan administration – no nondiscrimination testing and business owners are not required to file annual reports with the IRS until the plan reaches $250,000 in assets or when the plan terminates

Core Features

  • Option to add Mega Backdoor Roth
  • Assistance with annual 5500 EZ and 1099-R form preparation at no additional cost
  • Expert plan consulting available during setup
  • Option to take a loan from retirement savings

Sign Up Online for a Single(k)® Plan Now

Purchase Single(k) Plan

Got questions? Speak with a Retirement Plan Specialist.

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Single(k) Plan Provisions

Who Can Participate

Business owner, business partner OR spouse (maximum of 2 people) 


Immediate or 12-months (1,000 hours) of service

Employee Contributions

Pretax and Roth (optional Mega Backdoor Roth)

Employer Contributions

Profit-Sharing Contributions


Full and immediate



In-Service Withdrawals

Available to participants over age 59½

Individual Contribution Limits

Salary Deferral Contribution

Up to $23,000 for 2024 ($22,500 in 2023)

Profit-Sharing Contribution

For corporations: Up to 25% of income
For the self-employed: Up to 20% of income

Annual Limit Per Participant

Lesser of 100% of salary or $69,000 ($66,000 in 2023)

Catch-Up Contributions (if age 50 or older)


For additional details on contribution limits, click here.

Solo 401(k) Setup Deadlines

To establish a plan for a tax year, the business owner must:

  • Sign a plan document by the last day of the business’s tax year to contribute for that year (e.g., December 31 for a calendar-year business)
  • Make all contributions by the business’s federal income tax return due date, including extensions
  • Plan may be set up for the prior year if they sign up by their tax deadline (no extensions)

Download Your Single(k)®
Fact Sheet

Checking off boxes on 401(k) retirmenet plan

Learn more about our Single(k) offering

    Additional Resources for Solo 401(k)

    Schedule Your Free Single(k) Consultation

    Setting up a 401(k) can be complicated. Ubiquity gives small business owners access to retirement experts in addition to industry-leading, low, flat fees1. Each retirement specialist has over a decade of experience assisting business owners in 401(k) plan design.

    Ubiquity is not a registered investment advisor, and the information provided herein should not be considered legal or tax advice. We recommend consulting with your financial planner, attorney, and/or tax advisor for personalized advice.

    1 Decimal, Inc. charges flat fees for recordkeeping and administrative services. Third-party service providers may assess asset-based fees to customers. We advise Plan Sponsors to review all service agreements with providers, such as investment advisors, custodians, and broker-dealers, to evaluate the total cost of the plan.

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    San Francisco, CA 94104

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    Visit our Help Center
    6am–5pm PT / 9am–8pm ET

    © 2024 Ubiquity Retirement + Savings
    44 Montgomery Street, Suite 300
    San Francisco, CA 94104