How Business Owners Can Use SEP IRAs and Solo 401(k)s to Reduce Taxes
As a business owner, filing your taxes is only part of the equation.
What you do after you’ve made money can have just as much impact on your long-term financial position. Yet many business owners stop at compliance—filing returns, paying taxes, and moving on.
The reality is, there are strategies available that can help you reduce your taxable income while building wealth for the future. Two of the most recommended options here at Karolyn Diaz CPA are SEP IRAs and Solo 401(k)s.
Why Tax Planning is a Year-round Necessity
Some business owners look for more deductions to take toward the end of the year. One very popular opinion that we hear is that business owners should buy a new car to offset taxable income. But what if you don’t need a new car? Another popular idea is that you should take a net loss every year so you never owe taxes. If that’s the case, are you actually making money from the business? On the other end of the spectrum, once tax season ends, many business owners shift their focus back to operations and growth.
However, intentional pauses to evaluate your tax strategy during the year are crucial to your overall tax strategy. Post-tax season is actually one of the best times to evaluate how you can be more tax-efficient moving forward. Because let’s face it, waiting until it’s time to file your return to ask about deductions is too late to take advantage of strategies that could have helped you months earlier.
If you’ve experienced a higher tax bill than expected, or if your income has grown, it may be time to consider retirement-focused strategies that can also provide immediate tax benefits.
What Is a SEP IRA?
A Simplified Employee Pension (SEP) IRA is a retirement account designed for self-employed individuals and small business owners.
It allows you to contribute a percentage of your business income into a retirement account, which can reduce your taxable income for the year. SEP IRAs are designed for employer-only contributions. This means that as your own employer, you are able to put aside quantifiable dollars that will be shielded from taxes today. However, when you reach retirement age and are ready to withdraw, taxes will be incurred on those tax-deferred contributions.
Key benefits:
Easy to set up and maintain
Contributions are tax-deductible
Higher contribution limits compared to traditional IRAs
The next section evaluates the benefits of a Solo 401(k) to help you decide which feels right to you.
What Is a Solo 401(k)?
A Solo 401(k), also known as an individual 401(k), is designed for business owners with no employees (other than a spouse).
It offers more flexibility than a SEP IRA and often allows for higher total contributions.
Key benefits:
Ability to contribute as both employer and employee
Potential for higher contribution limits
Option for Roth contributions (in some plans)
Greater control over retirement planning
This makes it a powerful option for business owners looking to maximize both tax savings and long-term growth. The combined employee and employer contribution allowance gives you the opportunity to super-fund your way to retirement. Consider this option if you want the ability to boost retirement funds before bringing on additional employees.
How These Accounts Help Reduce Taxes
Both SEP IRAs and Solo 401(k)s reduce your taxable income by allowing you to contribute pre-tax dollars.
This means:
You lower the amount of income subject to tax
You defer taxes on contributions until retirement
You create a structured way to build long-term wealth
For high-earning business owners, this can translate into significant tax savings. However, as with any tax strategy, quantifying what you are allowed to contribute is very important so you do not assume dollars can be saved in a loss year for your business.
Weighing the Tradeoffs
While these strategies offer clear advantages, they are not without tradeoffs.
The primary consideration is liquidity.
Funds contributed to these accounts are generally locked in until retirement age, and early withdrawals may result in penalties and taxes.
Because of this, it’s important to evaluate:
Your current cash flow needs
Your business reinvestment plans
Your long-term financial goals
It’s also worth considering whether a backdoor Roth conversion could benefit you at some point between now and retirement. In simple terms, this strategy involves paying taxes on contributions today at your current income tax rate, so your investments can then grow largely tax-free going forward.
Who Should Consider These Strategies?
SEP IRAs and Solo 401(k)s are particularly useful for:
Single-member LLC owners
Self-employed professionals
Business owners with consistent or growing income
Individuals looking to reduce their current tax burden
Final Thoughts
Tax planning goes beyond filing returns—it’s about making intentional decisions with the income you’ve worked hard to earn.
If you’re only focusing on compliance, you may be missing opportunities to reduce your tax liability and build wealth at the same time.
As you move forward from this tax season, it may be worth exploring whether a SEP IRA or Solo 401(k) fits into your overall strategy.
Reach out if you are searching for a tax CPA to help you file next season’s returns. If you’re looking for advice on which option to select or how much you can contribute to retirement as well, please book an initial consultation with Karolyn by clicking on “Schedule a free consultation”.
We hope you found this post helpful in your financial planning journey!
Disclaimer: This information is meant to educate and inform. It’s not intended as personalized tax or financial advice, and does not create a CPA-client relationship.
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