Altruist Advisors: Keeping All Solo 401(k) Options Open — Why the 12/31 Deadline is Critical
Watch: Essential webinar on the December 31st Solo 401(k) deadline and maximizing retirement contributions for self-employed professionals
⚠️ Critical Deadline Alert
Your clients must establish their Solo 401k plan by December 31, 2025 to preserve the ability to make all types of Solo 401k contributions for 2025 until the business tax return deadline including extension in 2026.
Understanding the December 31st Solo 401(k) Deadline
The Solo 401(k) establishment deadline is fundamentally different from contribution deadlines, and understanding this distinction is crucial for maximizing your retirement savings strategy.
What Does “Establishing” a Solo 401(k) Actually Mean?
Establishing a Solo 401(k) plan means having the legal plan documents in place. A Solo 401(k) is a legal entity, and like any legal entity, it’s the documents that create it. This is why working with providers like My Solo 401k Financial makes meeting the deadline straightforward—the plan documents are created and in place within the same business day when you sign up.
💡 Key Insight: Documents Create the Plan
You don’t need to open bank or brokerage accounts by December 31st, and you don’t need to obtain an EIN number for the plan by year-end. You just need the plan documents established. Everything else can be completed in 2026.
What You Must Do by December 31, 2025
To preserve your ability to make contributions based on 2025 self-employment income, you must:
- Establish the Solo 401(k) plan documents by December 31, 202
What You DON’T Need to Do by December 31st
Contribution Deadlines: When Must Funds Actually Be Deposited?
While the Solo 401(k) plan must be established by December 31st, the actual contribution deadlines are much more flexible for self-employed individuals—and they’re different from the rules that apply to traditional employer plans.
Self-Employed Contribution Rules Are Different
Many CPAs and tax advisors may incorrectly tell clients that employee contributions must be made by December 31st. This is true for traditional employer 401(k) plans where employees work for a company. However, for self-employed individuals with a Solo 401(k), the rules are completely different.
⚠️ Important: Educate Your CPA or Tax Advisor
If your CPA or tax advisor tells you that employee contributions must be made by December 31st, they may be thinking of the rules for traditional employer plans. For self-employed individuals, as long as you establish the plan documents by December 31st, you can make all types of contributions—including employee, employer, and voluntary after-tax contributions—by your business tax return deadline, including extensions.
Actual Contribution Deadlines by Business Structure
All three types of Solo 401(k) contributions—employee, employer, and voluntary after-tax—can be made by these deadlines, giving you months of flexibility to fund your retirement accounts.
What Your Clients Must Do by December 31st
The action required is straightforward but time-sensitive. Your clients need to:
- Visit My Solo 401k Financial’s website at mysolo401k.net
- Click on Solo 401k Application
- Complete the signup process with their business and personal information
- Make payment to finalize the plan adoption
That’s it. Once these steps are completed by December 31, 2025, the plan is established, and all contribution options for 2025 remain available.
Ready to Establish Your Solo 401(k) Before the December 31st Deadline?
Don’t let the year-end deadline pass and lose your ability to maximize 2025 retirement contributions. My Solo 401k Financial makes it easy to establish your plan documents within the same business day.
📋 Important Disclaimer
This information is provided for educational purposes only and should not be construed as tax, legal, or investment advice, nor is it a solicitation. Always consult with qualified tax, legal, and financial professionals before making any retirement planning or investment decisions.
