by
Garrett Clark
Solo Business Guidance
The Ultimate Solo 401(k) FAQ
If you're self-employed, own a small business, or earn income from freelancing or a side hustle, you've probably heard of the Solo 401(k). But how does it work? Who qualifies? What can you invest in? And how does it compare to other retirement accounts? This comprehensive FAQ answers the most common questions about Solo 401(k) plans, helping you understand eligibility, contributions, rollovers, investment options, loans, distributions, and much more. Whether you're just getting started or already have a Solo 401(k), this guide is designed to be your go-to resource.
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What Is a Solo 401(k)?
A Solo 401(k), also called an Individual 401(k), is a retirement plan designed specifically for self-employed individuals and business owners who have no common-law full-time employees other than themselves and, if applicable, their spouse.
Despite the name, a Solo 401(k) offers many of the same tax advantages as a traditional employer-sponsored 401(k), while often providing greater flexibility for eligible business owners.
Who Qualifies for a Solo 401(k)?
Generally, you may qualify if:
You have self-employment income.
You operate a sole proprietorship, single-member LLC, partnership, S corporation, or C corporation.
You have no common-law full-time employees other than yourself and possibly your spouse (subject to IRS rules and exceptions).
Examples include:
Freelancers
Consultants
Realtors
Contractors
Doctors
Dentists
Attorneys
Content creators
Farmers
Electricians
Plumbers
Photographers
Online business owners
Can I Have a W-2 Job and a Solo 401(k)?
Yes.
Many people qualify because they operate a side business while also working full-time.
Examples include:
Corporate employee + consulting business
Teacher + Etsy shop
Engineer + real estate business
Nurse + photography business
Your business does not have to be your primary source of income.
What If My Business Is Only a Side Hustle?
You may still qualify.
As long as your side business generates eligible self-employment income and meets Solo 401(k) requirements, you may establish the plan.
Many successful Solo 401(k) owners began with small side businesses.
Does My Business Need an LLC?
No.
An LLC is not required.
Eligible businesses include:
Sole proprietorships
Single-member LLCs
Partnerships
S corporations
C corporations
Can My Spouse Participate?
Yes.
If your spouse works in the business and receives eligible compensation, they may generally participate in the Solo 401(k).
This can significantly increase a household's retirement savings potential.
How Much Can I Contribute?
Eligible participants may make:
Employee elective deferrals
Employer profit-sharing contributions
The exact amount depends on factors such as:
Business structure
Compensation
IRS annual limits
Age
Other retirement plans
Always consult current IRS limits or a qualified tax professional before calculating contributions.
Can I Have Multiple Retirement Plans?
Yes.
You may participate in:
Employer 401(k)
Solo 401(k)
Roth IRA (subject to IRS income limits)
Traditional IRA
HSA (if eligible)
However, IRS contribution rules may apply across certain plans.
Is a Solo 401(k) Better Than an IRA?
Neither is universally better.
Each serves different purposes.
A Solo 401(k) often provides:
Higher contribution opportunities
Participant loan availability (if the plan permits)
Broader investment flexibility with self-directed plans
Potential Roth option
Employer contribution capability
Can I Roll Over an Old 401(k)?
Often, yes.
If you've left your employer, you may be able to roll eligible assets from a traditional employer-sponsored 401(k) into your Solo 401(k), provided your plan accepts rollovers and IRS rules are met.
Can I Roll Over Other Retirement Accounts?
Depending on IRS rules and your plan, eligible rollovers may include:
Traditional 401(k)s
403(b)s
Governmental 457(b)s
Traditional IRAs
SEP IRAs
SIMPLE IRAs (after the required holding period)
Roth IRA rollover rules differ and should be reviewed carefully.
What Can a Solo 401(k) Invest In?
Depending on plan provisions and IRS rules, investments may include:
Stocks
Bonds
Mutual funds
ETFs
Real estate
Private lending
Certain IRS-approved precious metals
Tax liens
Private companies
Limited partnerships
Promissory notes
What Investments Are Not Allowed?
Examples generally include:
Collectibles
Most artwork
Alcohol collections
Antique furniture
Rugs
Gems
Personal-use property
Certain transactions involving disqualified persons are also prohibited.
Can My Solo 401(k) Buy Real Estate?
Yes.
Many self-directed Solo 401(k)s permit real estate investments.
Examples include:
Rental homes
Commercial buildings
Raw land
Industrial property
Storage facilities
Apartment buildings
However, IRS prohibited transaction rules must always be followed.
Can I Live in Property Owned by My Solo 401(k)?
No.
Retirement assets cannot generally be used for your immediate personal benefit.
Personal use would typically create a prohibited transaction.
Can My Solo 401(k) Buy a Vacation Home?
Not for personal use.
Any investment property owned by the plan must remain an investment for the benefit of the retirement account.
Can My Solo 401(k) Buy Gold?
Yes.
Certain IRS-approved precious metals may be permitted.
Collectible coins generally are not.
Can My Solo 401(k) Invest in Cryptocurrency?
Some self-directed plans permit cryptocurrency investments.
Investors should carefully evaluate custodial requirements, security, volatility, and IRS guidance before investing.
What Is Checkbook Control?
Checkbook control allows the Solo 401(k) trustee to execute qualified investments directly from the plan's bank account rather than waiting for custodian approval for every transaction.
This may allow greater efficiency when making investments.
Can I Borrow From My Solo 401(k)?
Many Solo 401(k) plans include participant loan provisions.
Loans are subject to IRS limits, repayment schedules, and plan provisions.
IRAs generally do not offer participant loans.
What Is a Prohibited Transaction?
A prohibited transaction is an action that violates IRS retirement plan rules.
Examples may include:
Using retirement assets for personal benefit.
Selling personal property to the plan.
Purchasing property from yourself.
Paying yourself for managing plan-owned assets.
Engaging in certain transactions with disqualified persons.
Violations may have significant tax consequences.
Who Are Disqualified Persons?
Examples generally include:
You
Your spouse
Parents
Grandparents
Children
Grandchildren
Certain entities they control
Understanding these rules is essential before making alternative investments.
What Is a Non-Recourse Loan?
A non-recourse loan allows a retirement plan to finance certain investments without creating personal liability for the account owner.
These loans are commonly discussed in connection with real estate investing.
Do I Need to File Form 5500-EZ?
Possibly.
IRS filing requirements generally depend on factors such as total plan assets and whether the plan is terminating.
Review current IRS requirements each year.
Can I Make Roth Contributions?
Many Solo 401(k) plans include a Roth feature.
Roth contributions are generally made with after-tax dollars, and qualified withdrawals may be tax-free.
What Happens If I Hire Employees?
Hiring common-law full-time employees may affect your eligibility to continue operating a Solo 401(k).
If your business grows, you may need to transition to another type of qualified retirement plan.
What Happens If I Close My Business?
Closing your business does not automatically eliminate your retirement savings.
Depending on your circumstances, you may:
Terminate the plan
Roll eligible assets into another qualified plan
Maintain the account under applicable rules
What Happens When I Retire?
When you retire, you'll generally begin planning how and when to take distributions according to IRS rules.
Distribution timing depends on your age, plan type, and applicable regulations.
Should I Leave My Old 401(k) Behind?
Every situation is different.
Some people choose to leave assets with a former employer.
Others roll eligible assets into a Solo 401(k) or another retirement account for:
Simplicity
Investment flexibility
Easier management
Consolidation
Can I Have More Than One Solo 401(k)?
You may establish more than one Solo 401(k) under certain circumstances, but contribution calculations can become more complex.
Consult a retirement professional before doing so.
How Long Does It Take to Open a Solo 401(k)?
The timeline varies by provider but generally ranges from a few business days to a couple of weeks, depending on documentation requirements.
How Often Should I Review My Solo 401(k)?
At least annually.
Many investors also review:
Investments
Contributions
Beneficiaries
Plan documents
Tax planning opportunities
Business income
What Are the Biggest Benefits of a Solo 401(k)?
Many business owners choose a Solo 401(k) because it may offer:
High contribution opportunities
Tax advantages
Roth contribution option
Participant loan feature
Investment flexibility
Real estate investing
Private lending
Checkbook control
Rollovers from eligible employer plans
Consolidated retirement management
Final Thoughts
A Solo 401(k) is one of the most powerful retirement planning tools available to eligible self-employed individuals and business owners whether you're operating a full-time business or earning income through a side hustle, understanding how a Solo 401(k) works can help you make informed decisions about your financial future.
While retirement planning can seem complex, it doesn't have to be overwhelming. By learning the rules, understanding your options, and reviewing your plan regularly, you can take advantage of the flexibility and opportunities a Solo 401(k) may provide.
If you're beginning your research, think of this FAQ as a starting point. As your business grows and your retirement goals evolve, continue educating yourself and work with qualified tax and financial professionals to ensure your strategy aligns with current IRS rules and your long-term objectives.
Disclaimer
This FAQ is intended for educational purposes only and should not be considered legal, tax, financial, or investment advice. IRS rules, contribution limits, eligibility requirements, rollover provisions, and retirement plan regulations may change over time.
What Is a Solo 401(k)?
A Solo 401(k), also called an Individual 401(k), is a retirement plan designed specifically for self-employed individuals and business owners who have no common-law full-time employees other than themselves and, if applicable, their spouse.
Despite the name, a Solo 401(k) offers many of the same tax advantages as a traditional employer-sponsored 401(k), while often providing greater flexibility for eligible business owners.
Who Qualifies for a Solo 401(k)?
Generally, you may qualify if:
You have self-employment income.
You operate a sole proprietorship, single-member LLC, partnership, S corporation, or C corporation.
You have no common-law full-time employees other than yourself and possibly your spouse (subject to IRS rules and exceptions).
Examples include:
Freelancers
Consultants
Realtors
Contractors
Doctors
Dentists
Attorneys
Content creators
Farmers
Electricians
Plumbers
Photographers
Online business owners
Can I Have a W-2 Job and a Solo 401(k)?
Yes.
Many people qualify because they operate a side business while also working full-time.
Examples include:
Corporate employee + consulting business
Teacher + Etsy shop
Engineer + real estate business
Nurse + photography business
Your business does not have to be your primary source of income.
What If My Business Is Only a Side Hustle?
You may still qualify.
As long as your side business generates eligible self-employment income and meets Solo 401(k) requirements, you may establish the plan.
Many successful Solo 401(k) owners began with small side businesses.
Does My Business Need an LLC?
No.
An LLC is not required.
Eligible businesses include:
Sole proprietorships
Single-member LLCs
Partnerships
S corporations
C corporations
Can My Spouse Participate?
Yes.
If your spouse works in the business and receives eligible compensation, they may generally participate in the Solo 401(k).
This can significantly increase a household's retirement savings potential.
How Much Can I Contribute?
Eligible participants may make:
Employee elective deferrals
Employer profit-sharing contributions
The exact amount depends on factors such as:
Business structure
Compensation
IRS annual limits
Age
Other retirement plans
Always consult current IRS limits or a qualified tax professional before calculating contributions.
Can I Have Multiple Retirement Plans?
Yes.
You may participate in:
Employer 401(k)
Solo 401(k)
Roth IRA (subject to IRS income limits)
Traditional IRA
HSA (if eligible)
However, IRS contribution rules may apply across certain plans.
Is a Solo 401(k) Better Than an IRA?
Neither is universally better.
Each serves different purposes.
A Solo 401(k) often provides:
Higher contribution opportunities
Participant loan availability (if the plan permits)
Broader investment flexibility with self-directed plans
Potential Roth option
Employer contribution capability
Can I Roll Over an Old 401(k)?
Often, yes.
If you've left your employer, you may be able to roll eligible assets from a traditional employer-sponsored 401(k) into your Solo 401(k), provided your plan accepts rollovers and IRS rules are met.
Can I Roll Over Other Retirement Accounts?
Depending on IRS rules and your plan, eligible rollovers may include:
Traditional 401(k)s
403(b)s
Governmental 457(b)s
Traditional IRAs
SEP IRAs
SIMPLE IRAs (after the required holding period)
Roth IRA rollover rules differ and should be reviewed carefully.
What Can a Solo 401(k) Invest In?
Depending on plan provisions and IRS rules, investments may include:
Stocks
Bonds
Mutual funds
ETFs
Real estate
Private lending
Certain IRS-approved precious metals
Tax liens
Private companies
Limited partnerships
Promissory notes
What Investments Are Not Allowed?
Examples generally include:
Collectibles
Most artwork
Alcohol collections
Antique furniture
Rugs
Gems
Personal-use property
Certain transactions involving disqualified persons are also prohibited.
Can My Solo 401(k) Buy Real Estate?
Yes.
Many self-directed Solo 401(k)s permit real estate investments.
Examples include:
Rental homes
Commercial buildings
Raw land
Industrial property
Storage facilities
Apartment buildings
However, IRS prohibited transaction rules must always be followed.
Can I Live in Property Owned by My Solo 401(k)?
No.
Retirement assets cannot generally be used for your immediate personal benefit.
Personal use would typically create a prohibited transaction.
Can My Solo 401(k) Buy a Vacation Home?
Not for personal use.
Any investment property owned by the plan must remain an investment for the benefit of the retirement account.
Can My Solo 401(k) Buy Gold?
Yes.
Certain IRS-approved precious metals may be permitted.
Collectible coins generally are not.
Can My Solo 401(k) Invest in Cryptocurrency?
Some self-directed plans permit cryptocurrency investments.
Investors should carefully evaluate custodial requirements, security, volatility, and IRS guidance before investing.
What Is Checkbook Control?
Checkbook control allows the Solo 401(k) trustee to execute qualified investments directly from the plan's bank account rather than waiting for custodian approval for every transaction.
This may allow greater efficiency when making investments.
Can I Borrow From My Solo 401(k)?
Many Solo 401(k) plans include participant loan provisions.
Loans are subject to IRS limits, repayment schedules, and plan provisions.
IRAs generally do not offer participant loans.
What Is a Prohibited Transaction?
A prohibited transaction is an action that violates IRS retirement plan rules.
Examples may include:
Using retirement assets for personal benefit.
Selling personal property to the plan.
Purchasing property from yourself.
Paying yourself for managing plan-owned assets.
Engaging in certain transactions with disqualified persons.
Violations may have significant tax consequences.
Who Are Disqualified Persons?
Examples generally include:
You
Your spouse
Parents
Grandparents
Children
Grandchildren
Certain entities they control
Understanding these rules is essential before making alternative investments.
What Is a Non-Recourse Loan?
A non-recourse loan allows a retirement plan to finance certain investments without creating personal liability for the account owner.
These loans are commonly discussed in connection with real estate investing.
Do I Need to File Form 5500-EZ?
Possibly.
IRS filing requirements generally depend on factors such as total plan assets and whether the plan is terminating.
Review current IRS requirements each year.
Can I Make Roth Contributions?
Many Solo 401(k) plans include a Roth feature.
Roth contributions are generally made with after-tax dollars, and qualified withdrawals may be tax-free.
What Happens If I Hire Employees?
Hiring common-law full-time employees may affect your eligibility to continue operating a Solo 401(k).
If your business grows, you may need to transition to another type of qualified retirement plan.
What Happens If I Close My Business?
Closing your business does not automatically eliminate your retirement savings.
Depending on your circumstances, you may:
Terminate the plan
Roll eligible assets into another qualified plan
Maintain the account under applicable rules
What Happens When I Retire?
When you retire, you'll generally begin planning how and when to take distributions according to IRS rules.
Distribution timing depends on your age, plan type, and applicable regulations.
Should I Leave My Old 401(k) Behind?
Every situation is different.
Some people choose to leave assets with a former employer.
Others roll eligible assets into a Solo 401(k) or another retirement account for:
Simplicity
Investment flexibility
Easier management
Consolidation
Can I Have More Than One Solo 401(k)?
You may establish more than one Solo 401(k) under certain circumstances, but contribution calculations can become more complex.
Consult a retirement professional before doing so.
How Long Does It Take to Open a Solo 401(k)?
The timeline varies by provider but generally ranges from a few business days to a couple of weeks, depending on documentation requirements.
How Often Should I Review My Solo 401(k)?
At least annually.
Many investors also review:
Investments
Contributions
Beneficiaries
Plan documents
Tax planning opportunities
Business income
What Are the Biggest Benefits of a Solo 401(k)?
Many business owners choose a Solo 401(k) because it may offer:
High contribution opportunities
Tax advantages
Roth contribution option
Participant loan feature
Investment flexibility
Real estate investing
Private lending
Checkbook control
Rollovers from eligible employer plans
Consolidated retirement management
Final Thoughts
A Solo 401(k) is one of the most powerful retirement planning tools available to eligible self-employed individuals and business owners whether you're operating a full-time business or earning income through a side hustle, understanding how a Solo 401(k) works can help you make informed decisions about your financial future.
While retirement planning can seem complex, it doesn't have to be overwhelming. By learning the rules, understanding your options, and reviewing your plan regularly, you can take advantage of the flexibility and opportunities a Solo 401(k) may provide.
If you're beginning your research, think of this FAQ as a starting point. As your business grows and your retirement goals evolve, continue educating yourself and work with qualified tax and financial professionals to ensure your strategy aligns with current IRS rules and your long-term objectives.
Disclaimer
This FAQ is intended for educational purposes only and should not be considered legal, tax, financial, or investment advice. IRS rules, contribution limits, eligibility requirements, rollover provisions, and retirement plan regulations may change over time.