Retirement Accounts for Michigan Small Business Owners: SEP-IRA, Solo 401(k), and SIMPLE IRA Explained

Table of Contents

1. Why This Matters More for Business Owners Than Employees
2. SEP-IRA: The Simplest Option
3. Solo 401(k): The Most Powerful Option for Self-Employed
4. SIMPLE IRA: For Small Business Owners With Employees
5. Side-by-Side Comparison
6. How to Open Each Account
7. Michigan-Specific Considerations
8. The Most Common Mistakes
9. FAQ

Retirement accounts for Michigan small business owners are one of the most powerful and underused tax tools available — letting you keep more of what you earn while building real long-term wealth. Nobody is setting up retirement contributions on your behalf. There’s no HR department enrolling you in the company 401(k) during onboarding week. There’s no employer match silently building in the background. As a small business owner, retirement savings is entirely on you — and most owners either ignore it until it’s urgent or assume they’ll just sell the business someday and figure it out then.

That’s a risky plan. Business sales don’t always happen. Valuations disappoint. Markets move. The owners who arrive at retirement in strong financial position almost always share one trait: they consistently used the tax-advantaged retirement accounts available to them throughout their working years, even when cash was tight.

This guide breaks down the three main retirement account options for Michigan small business owners — SEP-IRA, Solo 401(k), and SIMPLE IRA — in plain terms. Not investment advice, not tax advice, but the foundational knowledge you need to have an intelligent conversation with your CPA and actually get this done. Choosing the right retirement accounts for Michigan small business owners depends on your income, employee count, and contribution goals.

Why This Matters More for Business Owners Than Employees

The case for retirement accounts is even stronger for small business owners than for employees, for two reasons that compound each other.

First, the tax reduction is immediate and significant. Every dollar you contribute to a SEP-IRA or Solo 401(k) reduces your taxable income dollar-for-dollar. For a Michigan small business owner earning $120,000 in net self-employment income, a $20,000 SEP-IRA contribution reduces federal taxable income by $20,000 — saving roughly $4,400–6,000 in federal income tax at typical marginal rates, plus $2,826 in self-employment tax (since the deduction also reduces SE income). Michigan’s flat 4.25% income tax adds another $850 in savings. That’s a potential $7,000–9,000 in combined tax savings on a $20,000 contribution — an effective “return” before any investment gain. Retirement accounts for Michigan small business owners in Livingston County can reduce taxable income by tens of thousands annually.

Second, compounding time matters enormously. A 35-year-old who contributes $15,000 per year for 30 years at a 7% average annual return has approximately $1.5 million by age 65. A 45-year-old who starts the same contribution pattern has roughly $655,000 at 65. The earlier you start, the less you have to contribute to reach the same outcome. Every year of delay has a real cost.

SEP-IRA: The Simplest Option

The SEP-IRA (Simplified Employee Pension Individual Retirement Account) is the most common retirement account for self-employed Michigan business owners and solo operators, and for good reason: it’s extraordinarily simple to set up and maintain, and the contribution limits are generous. The best retirement accounts for Michigan small business owners allow you to save more than any employee could through a 401k.

How It Works

You contribute as the employer only — there are no employee-side contributions. The contribution limit is the lesser of 25% of net self-employment income or $69,000 (2024 limit; indexed for inflation annually). Net self-employment income is your Schedule C profit minus the deductible portion of self-employment tax. For most owners, the effective contribution rate is approximately 20% of gross SE income.

Example: If your net SE income is $100,000, your maximum SEP-IRA contribution is approximately $18,587 (the specific calculation involves your SE income minus the SE tax deduction — your CPA can calculate this precisely or IRS Publication 560 has the formula). Retirement accounts for Michigan small business owners who are self-employed include SEP-IRA, Solo 401k, and SIMPLE IRA options.

Key Advantages

• Simple setup: Open at any major brokerage (Fidelity, Vanguard, Schwab) in minutes with no startup cost
• No annual filing: Unlike a 401(k), a SEP-IRA requires no Form 5500 filing with the IRS
• Flexible contributions: You don’t have to contribute every year. Good years contribute more; lean years contribute less or zero
• Late contribution deadline: You can fund the SEP-IRA for the prior tax year up to your tax filing deadline including extensions (October 15 with extension)
• Employees: If you have eligible employees, you must contribute the same percentage for them as you do for yourself

Key Limitation

At lower income levels, the SEP-IRA allows a smaller dollar contribution than a Solo 401(k) because you can only contribute as an employer (up to 25% of compensation). The Solo 401(k) allows employee-side contributions on top of employer contributions, which makes it more powerful for owners earning under roughly $150,000–200,000.

Solo 401(k): The Most Powerful Option for Self-Employed

The Solo 401(k) — also called a One-Participant 401(k) or Individual 401(k) — is the highest-contribution retirement vehicle available to self-employed individuals with no full-time employees other than a spouse. It combines employee and employer contributions for a maximum that can exceed the SEP-IRA at most income levels. Retirement accounts for Michigan small business owners should be opened before year-end to maximize your current-year deduction.

How It Works

The Solo 401(k) has two contribution components: an employee contribution (up to $23,000 in 2024, or $30,500 if you’re 50 or older) plus an employer contribution (up to 25% of compensation), combined not to exceed $69,000 total ($76,500 with catch-up).

The difference from the SEP-IRA is most visible at moderate income levels. A business owner with $80,000 in net SE income can contribute approximately $15,000 to a SEP-IRA (25% of ~$60K adjusted income). That same owner can contribute $23,000 in employee contributions to a Solo 401(k) plus ~$12,000 in employer contributions — approximately $35,000 total. That’s a $20,000 difference in tax-deductible contributions on the same income. Retirement accounts for Michigan small business owners compound fastest when contributions are made consistently, not just at tax time.

Roth Solo 401(k) Option

Many Solo 401(k) providers now offer a Roth option for employee-side contributions. Roth contributions don’t reduce your taxable income now, but grow tax-free and come out tax-free in retirement. For younger owners or those expecting higher income in retirement, the Roth component can be valuable. You can even split contributions — some traditional (deductible now), some Roth (tax-free later).

Key Limitations

• Employees not eligible: If you hire a full-time W-2 employee (other than your spouse), you can no longer use a Solo 401(k) — you’d need to convert to a SIMPLE IRA or a traditional 401(k)
• Form 5500 required: Once plan assets exceed $250,000, you must file Form 5500-EZ annually with the IRS
• Contribution deadline: Employee contributions must be elected by December 31 of the tax year (though the actual funding can wait until tax filing deadline). This is a critical difference from the SEP-IRA — you must set up and elect contributions before year-end

SIMPLE IRA: For Small Business Owners With Employees

The SIMPLE IRA (Savings Incentive Match Plan for Employees) is designed for small businesses with up to 100 employees. It’s significantly easier to administer than a traditional 401(k) while still giving employees a meaningful retirement benefit — which helps with recruiting and retention in Livingston County’s tight labor market. Retirement accounts for Michigan small business owners are faith-aligned stewardship — building a sustainable legacy, not just wealth.

How It Works

Employees can contribute up to $16,000 in 2024 ($19,500 if 50+) through salary deferral. As the employer, you must either match employee contributions dollar-for-dollar up to 3% of their compensation, or make a flat 2% contribution for all eligible employees whether they contribute or not. The employer contribution is mandatory — this is the key tradeoff versus the SEP-IRA or Solo 401(k) where your own contributions are discretionary.

Key Advantages for Employers

• Lower administrative cost than a traditional 401(k) — no discrimination testing, no Form 5500
• Required employer contribution signals investment in employees — strong retention tool
• Owner can contribute as an employee (up to $16,000) plus receive the employer match

Key Limitation

The 2-year waiting period: SIMPLE IRA assets cannot be rolled over or transferred for two years from the date of first contribution. This restricts flexibility. Also, if your business outgrows 100 employees, you’ll need to transition to a traditional 401(k), which involves cost and disruption. Retirement accounts for Michigan small business owners with employees require plan documents and compliance — consult a local advisor.

Side-by-Side Comparison

Here’s how the three options stack up across the factors that matter most to Michigan small business owners:

• SEP-IRA: Max contribution ~20% of gross SE income | Setup: easy, 15 min | Annual filing: none | Best for: solo operators who want simplicity
• Solo 401(k): Max $69K ($23K employee + 25% employer) | Setup: moderate | Annual filing: Form 5500-EZ when assets exceed $250K | Best for: solo operators who want to maximize contributions, especially at income under $200K
• SIMPLE IRA: Max $16K employee + 2–3% employer match | Setup: easy | Annual filing: none | Best for: businesses with 1–100 employees who want a benefit program without 401(k) complexity

How to Open Each Account

Opening a SEP-IRA

The fastest path: go to Fidelity, Vanguard, or Charles Schwab and open a SEP-IRA online. You’ll need your EIN (or SSN for sole proprietors), a bank account for funding, and a few minutes. Most major brokerages have a simple online application with no fees. You can open the account and fund it the same day. SEP-IRA accounts for prior tax years can be opened and funded up to the tax filing deadline with extension (October 15). Retirement accounts for Michigan small business owners who start early have the longest runway for tax-free compound growth.

Opening a Solo 401(k)

Also available at major brokerages with no fees. The critical timing constraint: to make employee-side contributions for the current tax year, you must establish the plan by December 31 — you cannot open a Solo 401(k) on April 14 and make prior-year employee contributions. Open it by October if you’re planning to maximize contributions. Fidelity, Vanguard, Schwab, and E-Trade all offer Solo 401(k) plans with no annual fee and broad investment selection.

Opening a SIMPLE IRA

SIMPLE IRAs require more advance planning. The plan must be established by October 1 of the year contributions begin, and employees must receive notice 60 days before the plan’s effective date. Your financial advisor or CPA can help establish a SIMPLE IRA through a major brokerage or insurance company. There are also payroll-integrated SIMPLE IRA solutions (Paychex, ADP, Gusto all offer these) that simplify administration for businesses with employees on payroll. Retirement accounts for Michigan small business owners are protected from creditors under Michigan law, adding security beyond savings.

Michigan-Specific Considerations

Michigan generally conforms to federal tax treatment of retirement contributions — contributions to SEP-IRA, Solo 401(k), and SIMPLE IRA are deductible for Michigan income tax purposes in the same way they are for federal purposes. Michigan’s flat 4.25% income tax rate means a $20,000 retirement contribution saves $850 in Michigan income tax in addition to federal savings.

Michigan also taxes retirement income in retirement, though there are exemptions depending on birth year and the type of retirement income. The tax treatment of IRA and 401(k) distributions in retirement has changed under recent Michigan legislation — consult a CPA familiar with Michigan tax law to understand your expected tax treatment in retirement as part of your overall retirement planning. Retirement accounts for Michigan small business owners in Livingston County are available through local credit unions and fee-only advisors.

For Livingston County business owners: several Kingdom Gate members work in financial planning and accounting and can provide referrals to advisors who specialize in retirement planning for small business owners. The member directory is the starting point — a warm introduction from a fellow business owner beats a cold Google search every time.

The Most Common Mistakes

Waiting Until the Business “Is Big Enough”

There is no threshold at which retirement saving becomes appropriate. Every year you wait has a compounding cost. A $5,000 contribution at age 30 is worth roughly $38,000 at age 65 at 7% average growth. That same $5,000 contributed at age 45 is worth about $14,000. Start small if you have to. Start now.

Missing the Solo 401(k) Year-End Deadline

The most expensive administrative mistake. Many business owners decide in January or February that they want to maximize retirement contributions for the prior year — and discover their Solo 401(k) window has closed. They could have put in $35,000 into a Solo 401(k) but can now only contribute $15,000 to a SEP-IRA because they missed the December 31 setup deadline. Set a calendar reminder for November 1 to review retirement account contributions every year.

Choosing Wrong for Your Situation

A solo operator earning $60,000 who opens a SEP-IRA when a Solo 401(k) would have allowed twice the contribution is leaving a significant tax deduction on the table. The “right” account depends on income level, employee situation, and simplicity preference. Spend 30 minutes with your CPA specifically on this question at your next meeting — it’s worth the conversation.

Keeping Retirement Savings in Cash

Opening the account is only the first step. Many small business owners open a retirement account and then leave contributions sitting in the default cash or money market position for years. Choose an appropriate investment — most people in accumulation phase benefit from a diversified low-cost index fund or a target-date fund matched to their expected retirement year. This is not investment advice, but “do something intentional with the money” is universal good practice.

Frequently Asked Questions

Can I have both a SEP-IRA and a Solo 401(k)?

You can have both accounts open, but IRS rules limit your combined employer contributions across plans. Generally, if you have both a SEP-IRA and a Solo 401(k) with the same business, you cannot double-dip on employer contributions — the combined employer contributions are still limited to 25% of compensation. The Solo 401(k) employee-side contribution ($23,000) is separate and additive. Consult your CPA for the specific calculation in your situation.

What if I have a side business AND a W-2 job?

Your 401(k) employee contribution limit ($23,000 in 2024) applies across all plans — you can’t contribute $23,000 to your employer’s 401(k) and another $23,000 to your Solo 401(k). However, the employer-side Solo 401(k) contributions from your self-employment business are separate from your W-2 employer’s contributions and can stack. This is a nuanced area — a CPA should calculate the maximum contribution for your combined situation.

Does my LLC need to be incorporated to open a Solo 401(k)?

No. Sole proprietors, single-member LLCs taxed as disregarded entities, and partnerships are all eligible for Solo 401(k)s. The plan is established in the name of the business. For single-member LLCs, you’ll typically use your EIN (or SSN if you haven’t obtained an EIN, though an EIN is recommended).

Should I open a Roth Solo 401(k) or traditional?

The traditional question: do you want the tax break now (traditional) or in retirement (Roth)? If you expect to be in a higher tax bracket in retirement than today, Roth is likely better. If today’s tax rate is high, traditional saves you more now. Most financial planners suggest diversifying across both if contribution room allows — taking some reduction now and some tax-free growth later hedges against uncertainty about future tax rates.

The Bottom Line

Colossians 3:23 says to work with all your heart as working for the Lord. That standard of excellence applies to how you manage the resources your business generates — including building a financial foundation that doesn’t depend entirely on selling the business or working forever. Retirement accounts are one of the clearest examples of stewardship in practical financial life: legal, powerful tax advantages that reward intentionality and punish procrastination.

The SEP-IRA takes 15 minutes to open. Start there if you haven’t. Then have the Solo 401(k) conversation with your CPA this fall before December 31. This is one of the highest-impact, lowest-complexity financial moves available to you as a Michigan small business owner — and it’s entirely within your control today.

Retirement Accounts for Michigan Small Business Owners: Official IRS Resources

Choosing the right retirement accounts as a Michigan small business owner is one of the most important financial decisions you’ll make. Review these official IRS resources before selecting a SEP-IRA, Solo 401(k), or SIMPLE IRA.

• IRS — SEP-IRA Plan FAQs
• IRS — Solo 401(k) Plans for Self-Employed
• IRS — SIMPLE IRA Plan Overview
• DOL — Choosing a Retirement Solution for Your Small Business