BACK TO RESOURCES
Financial Planning

Retirement Plans for Business Owners: SEP-IRA vs Solo 401(k)

Many business owners quietly assume the eventual sale of their business will fund retirement. Here's why that's a risky plan on its own, and how SEP-IRAs, Solo 401(k)s, and cash balance plans can build a real one alongside it.

SMAART Advisors Team
|
August 25, 2026
|
4 min read
|Reviewed by Jouvens Corantin, Director of Business Accounting
Retirement Plans for Business Owners: SEP-IRA vs Solo 401(k)

Ask a business owner about their retirement plan and a common answer is some version of: "The business is my retirement plan. I'll sell it and that'll fund my retirement." It's an understandable assumption, the owner has usually put more time, money, and personal risk into the business than into any other asset, but it's also one of the riskiest retirement strategies an owner can rely on exclusively.

A business is illiquid, its value depends on market conditions at the exact moment of sale, and the timeline for selling isn't always the owner's to control. Building real retirement savings alongside the business, through tax-advantaged accounts designed for owners, is what turns "I hope the business sells well" into an actual plan.

Tax-deferred growth
SEP-IRAs, Solo 401(k)s, and cash balance plans all allow business owners to defer taxes on significantly more retirement savings than a standard IRA permits
Internal Revenue Service, Publication 560, Retirement Plans for Small Business
One asset, one outcome
Relying solely on a future business sale concentrates an owner's entire retirement outcome in a single illiquid asset, with no diversification if the sale underperforms or is delayed
Standard financial planning principle

Why "The Business Is My Retirement Plan" Is a Risky Bet

What can go wrongEffect on a business-only retirement plan
The business sells for less than expectedRetirement income shrinks with no other asset base to fall back on
A buyer isn't available on the owner's timelineRetirement gets delayed, or the sale happens under pressure at a worse price
Market or industry conditions soften right before a planned saleTiming risk that's entirely outside the owner's control
Health issues force an earlier-than-planned exitNo time to prepare the business for sale, which typically reduces achievable value
The business itself is the owner's only savings vehicleZero diversification: retirement outcome depends entirely on one illiquid asset
A sale is a bonus, not the plan

The healthiest way to think about a future business sale is as a potential addition to retirement savings, not the foundation of it. Owners who build real, tax-advantaged retirement savings independent of the business protect their retirement outcome even if the sale doesn't go exactly as hoped.

Retirement Plan Options Built for Business Owners

The tax code offers several retirement vehicles specifically well-suited to self-employed individuals and small business owners, generally allowing much higher contribution limits than a standard IRA.

1

SEP-IRA (Simplified Employee Pension)

Relatively simple to set up and administer, with contributions generally based on a percentage of compensation. A strong option for a business owner who wants meaningful tax-deferred savings without much administrative complexity, especially with few or no employees.

2

Solo 401(k)

Designed for a business owner with no full-time employees other than a spouse. Allows both an employee salary deferral and an employer profit-sharing contribution, often permitting a higher total contribution than a SEP-IRA at comparable income levels, and can include a Roth option.

3

Cash balance plan

A type of defined benefit plan that allows significantly larger tax-deductible contributions than a SEP-IRA or Solo 401(k). Particularly valuable for owners in their 50s or later trying to shelter a large amount of income and catch up on retirement savings in a compressed timeframe.

4

SIMPLE IRA

Designed for small businesses with employees, with lower administrative burden than a full 401(k) plan but also lower contribution limits than a SEP-IRA or Solo 401(k).

SEP-IRA vs. Solo 401(k): The Practical Comparison

FactorSEP-IRASolo 401(k)
Who it's forSelf-employed individuals and small businesses, with or without employeesSelf-employed individuals with no employees other than a spouse
Contribution structureEmployer-style contribution based on a percentage of compensationEmployee deferral plus employer profit-sharing contribution
Roth optionNoOften yes, depending on the plan
Administrative complexityLowerSlightly higher, especially once plan assets exceed the threshold requiring an annual filing
Best fitSimplicity-focused owners, or those with eligible employees to coverOwners without employees who want to maximize contributions and flexibility
Pro Tip

The right plan often changes as a business grows. A sole owner in the early years might start with a SEP-IRA for simplicity, then move to a Solo 401(k) once maximizing contributions becomes the priority, and eventually layer in a cash balance plan in the higher-income years closer to retirement. Revisiting the retirement plan structure every few years, rather than setting it once and forgetting it, is common practice among business owners who end up well prepared.

Integrating a Future Exit Into the Retirement Plan

A well-built retirement plan for a business owner treats the eventual business sale as one input among several, not the entire plan.

Building retirement income that doesn't depend entirely on the sale
  • Fund a SEP-IRA, Solo 401(k), or cash balance plan consistently, independent of whether or when the business sells
  • Treat projected sale proceeds as an addition to the retirement plan, not its foundation
  • Diversify personal investments outside the business itself, rather than reinvesting everything back into the company
  • Coordinate the business's exit timeline with the retirement plan's timeline, rather than treating them as unrelated decisions
  • Revisit contribution levels and plan type as income grows or changes, since the optimal structure at $150,000 in profit is often different from the optimal structure at $500,000
Key Takeaway

A business can absolutely be part of an owner's retirement outcome, but it shouldn't be the whole plan. The owners who retire on their own terms are the ones who built tax-advantaged retirement savings, through a SEP-IRA, Solo 401(k), or cash balance plan, consistently over the years, and who treat an eventual business sale as a welcome addition to that base rather than the only thing standing between them and retirement.

Build a retirement plan that doesn't depend entirely on your business sale

SMAART Advisors helps business owners choose and structure the right retirement vehicle, SEP-IRA, Solo 401(k), or cash balance plan, and integrate it with a realistic exit timeline.

Talk to an advisor

Sources

  1. IRS.gov: SEP Plan
  2. IRS.gov: One-Participant 401(k) Plans
  3. IRS Publication 560: Retirement Plans for Small Business (irs.gov)
  4. IRS.gov: Cash Balance Pension Plans and Defined Benefit Plan basics
  5. U.S. Small Business Administration: Retirement plans for small business (sba.gov)
  6. Federal Reserve: Survey of Consumer Finances (federalreserve.gov)

Frequently asked questions

It concentrates an owner's entire retirement outcome in a single, illiquid, undiversified asset that depends on the business remaining sellable, the market being favorable at the exact moment of retirement, and a buyer actually being available on the owner's timeline. A business sale can fall through, the market can soften right when an owner needs to sell, or health issues can force retirement earlier than planned. A retirement plan funded separately from the business provides a floor that doesn't depend on any of those things going right.

Both let a self-employed person or small business owner save significantly more than a standard IRA. A SEP-IRA is simpler to administer, with contributions generally limited to a percentage of compensation. A Solo 401(k) allows both an "employee" salary deferral and an "employer" profit-sharing contribution, which often allows a higher total contribution at moderate income levels, plus the option for Roth contributions, but comes with slightly more administrative requirements once the balance grows.

A cash balance plan is a type of defined benefit plan that allows for significantly larger tax-deductible contributions than a SEP-IRA or Solo 401(k), particularly valuable for older, high-income business owners trying to catch up on retirement savings in a compressed number of years. It requires more administrative complexity and often works best paired with a 401(k), but for the right owner it can shelter a much larger amount of income from current taxation.

Treat a future business sale as a potential source of retirement funding, not the plan itself. Build retirement savings through tax-advantaged accounts independent of the business, and treat any eventual sale proceeds as an addition to that base rather than the foundation. This protects your retirement outcome even if the business sells for less than hoped, sells later than planned, or doesn't sell on the timeline you expected.

Tags
retirement planning for business ownersSEP-IRA vs Solo 401kcash balance plansmall business retirement plansowner retirement savingssolo 401k contribution limitsbusiness exit and retirementSEP IRA small businessretirement plan for self employedbusiness owner financial planning