One of the most powerful — and most underused — tax strategies available to small business owners is establishing a retirement plan. The right plan can slash your tax bill by tens of thousands of dollars per year, help you attract and retain top talent, and build long-term wealth that compounds tax-free for decades. Yet according to the U.S. Bureau of Labor Statistics, only 53% of small businesses offer any retirement benefit at all.
The problem is not a lack of options — it is too many options. SEP IRAs, SIMPLE IRAs, Solo 401(k)s, traditional 401(k)s, defined benefit plans — each has different contribution limits, eligibility rules, administrative requirements, and tax implications. Choosing the wrong plan can mean leaving money on the table or taking on unnecessary complexity.
At Numbers Right, we help business owners match the right retirement plan to their specific situation. This guide breaks down the four most popular options, compares them side by side, and shows you how to pick the one that maximizes your tax savings in 2026.
Why a Retirement Plan Is a Tax Strategy, Not Just a Benefit
Before comparing plans, it is important to understand why retirement plans are one of the most effective tax strategies available:
- Employer contributions are tax-deductible — every dollar you contribute as the employer reduces your taxable business income
- Employee deferrals reduce payroll taxes — pre-tax contributions lower the wages subject to income tax withholding
- Investment growth is tax-deferred — earnings compound without annual tax drag until withdrawal in retirement
- Business owners can contribute as both employer and employee — in many plans, this means sheltering $60,000 or more per year from taxes
A business owner earning $200,000 who contributes $60,000 to a retirement plan could reduce their federal tax bill by $15,000 to $22,000 in a single year — while simultaneously building retirement wealth. Your CFO advisor can model the exact savings based on your income and entity structure.
The Four Main Retirement Plan Options
1. SEP IRA (Simplified Employee Pension)
The SEP IRA is the simplest retirement plan to set up and administer. It is employer-funded only — employees do not make their own contributions.
SEP IRA at a Glance
- 2026 Contribution Limit: Up to 25% of compensation or $70,000 (whichever is less)
- Who Contributes: Employer only
- Best For: Self-employed individuals and small businesses with few or no employees
- Setup Deadline: Can be established and funded up to your tax filing deadline (including extensions)
- Administration: Minimal — no annual IRS filings required
The SEP IRA shines for solo operators and businesses with only owner-employees. The catch: if you have employees, you must contribute the same percentage of pay for every eligible employee. A business owner contributing 25% of their own pay must also contribute 25% for each qualifying employee, which can get expensive quickly.
2. SIMPLE IRA (Savings Incentive Match Plan for Employees)
The SIMPLE IRA is designed for businesses with 100 or fewer employees. Unlike the SEP, employees can make their own contributions through payroll deductions.
SIMPLE IRA at a Glance
- 2026 Employee Contribution Limit: $16,500 ($20,000 if age 50+)
- Employer Contribution: Either match up to 3% of compensation or contribute 2% for all eligible employees
- Best For: Small businesses that want employee participation with low administrative burden
- Setup Deadline: October 1 of the year the plan takes effect
- Administration: Low — no annual IRS filings, but employer contributions are mandatory
The SIMPLE IRA works well for businesses that want to offer a retirement benefit without the complexity of a 401(k). The downside is lower contribution limits compared to other plans, which can be a disadvantage for high-earning business owners looking to maximize tax deferrals.
3. Solo 401(k)
The Solo 401(k) — also called an Individual 401(k) — is available only to businesses with no employees other than the owner and their spouse. It offers the highest contribution limits of any small business retirement plan.
Solo 401(k) at a Glance
- 2026 Contribution Limit: $23,500 employee deferral + 25% of compensation as employer contribution = up to $70,000 total ($77,500 if age 50+)
- Who Contributes: Owner as both employer and employee
- Best For: Self-employed individuals and owner-only businesses who want to maximize contributions
- Roth Option: Available — allows after-tax contributions with tax-free growth
- Loan Provision: Available — borrow up to $50,000 from the plan
For solo business owners, the Solo 401(k) is often the best choice. It allows significantly higher contributions than a SEP IRA at lower income levels because of the employee deferral component. Plus, the Roth option provides tax diversification that no other plan in this category offers.
4. Traditional 401(k)
The traditional 401(k) is the most flexible — and most complex — retirement plan option. It is suitable for businesses of any size with employees.
Traditional 401(k) at a Glance
- 2026 Employee Contribution Limit: $23,500 ($31,000 if age 50+)
- Employer Match: Discretionary — you choose the formula and amount
- Best For: Businesses with employees that want a competitive benefits package
- Vesting Schedules: Available — incentivize employee retention
- Administration: Higher — requires annual Form 5500 filing, nondiscrimination testing, and a plan document
The traditional 401(k) is the gold standard for employee recruitment and retention. The employer match is discretionary, meaning you can adjust contributions based on business performance. The trade-off is administrative complexity and cost — plan administration typically runs $1,000 to $5,000 per year depending on the provider and number of participants. Your payroll team handles the deferral deductions and reporting seamlessly.
Side-by-Side Comparison
| Feature | SEP IRA | SIMPLE IRA | Solo 401(k) | Traditional 401(k) |
|---|---|---|---|---|
| Max Annual Contribution | $70,000 | $16,500 + match | $70,000 | $23,500 + match |
| Employee Contributions | No | Yes | Yes (owner) | Yes |
| Roth Option | No | No | Yes | Yes |
| Loan Provision | No | No | Yes | Yes |
| Employees Allowed | Yes | Yes (≤100) | No (owner only) | Yes |
| Admin Complexity | Very Low | Low | Low-Medium | High |
| IRS Filing Required | No | No | Only if assets > $250K | Yes (Form 5500) |
How to Choose the Right Plan for Your Business
The best plan depends on three key factors: your business structure, whether you have employees, and how much you want to contribute. Here is a decision framework:
- Solo operator, no employees: Start with a Solo 401(k). It offers the highest contribution limits, a Roth option, and loan provisions. If you want simplicity and do not need the Roth feature, a SEP IRA is a close second
- Small team (under 25 employees): A SIMPLE IRA offers the easiest path to providing retirement benefits. If you want more flexibility in employer contributions, consider a traditional 401(k) with a safe harbor provision
- Growing business (25–100 employees): A traditional 401(k) gives you the most control over employer contributions and vesting schedules. It is also the most attractive benefit for recruitment
- High-earning owner with employees: Consider pairing a 401(k) with a cash balance defined benefit plan to shelter $100,000+ per year. This is an advanced strategy best implemented with your financial planning team
Common Mistakes to Avoid
Retirement Plan Pitfalls
- Missing contribution deadlines: SEP IRA contributions must be made by your tax filing deadline. 401(k) employee deferrals must be deposited within a few business days of payroll — late deposits trigger penalties
- Ignoring nondiscrimination testing: Traditional 401(k) plans must pass annual tests ensuring highly compensated employees do not benefit disproportionately. Safe harbor plans avoid this requirement
- Forgetting mandatory employer contributions: SIMPLE IRAs require either a 3% match or 2% nonelective contribution every year — there is no option to skip a year
- Not updating plan documents: Tax law changes regularly. Your plan document must be updated to reflect current regulations or risk disqualification
- Choosing based on simplicity alone: A SEP IRA is easy to set up, but a Solo 401(k) often allows higher contributions at the same income level. Run the numbers before deciding
The Tax Impact Is Real
To illustrate the impact, consider a business owner with $250,000 in net self-employment income:
| Scenario | Annual Contribution | Estimated Tax Savings |
|---|---|---|
| No retirement plan | $0 | $0 |
| SEP IRA (25%) | $57,692 | ~$17,300 |
| Solo 401(k) (max) | $70,000 | ~$21,000 |
| 401(k) + Defined Benefit | $150,000+ | ~$45,000+ |
That $21,000 in annual tax savings invested over 20 years at a 7% return grows to over $860,000 — just from the tax savings alone, not counting the actual retirement contributions. Proper bookkeeping ensures every contribution is recorded correctly for maximum deduction.
Start Now — the Best Time Was Yesterday
Every month without a retirement plan is a month of lost tax savings and lost compounding growth. The good news is that most plans can be established quickly — a SEP IRA can be set up and funded on the same day, and a Solo 401(k) typically takes two to four weeks.
At Numbers Right, our tax strategy and financial planning teams work together to analyze your income, entity structure, and goals to recommend the optimal retirement plan. We handle the setup, coordinate with your payroll team for employee deferrals, and ensure every contribution is properly documented for your financial reports.
Ready to start saving on taxes while building your retirement? Schedule a free retirement plan consultation and let us show you exactly how much you could save in 2026.
