The right question is not which plan is best. It is which plan fits what you are actually running. 

You do not need a big company or an HR department to have a good retirement plan. What you need is a plan that matches the business you have right now, not the one you hope to have in ten years. 

Think of it as a ladder. Start where you are, move up when the business gives you a reason to. Most people get in trouble by climbing too fast, committing to a plan that fit one good year and then living with it through three bad ones. 

Which brings up the question to ask before you look at a single contribution limit. 

Ask this first: how many years can you fund it? 

Every plan on this list falls somewhere on a line between fully discretionary and legally required. 

At one end, you decide every year whether to put money in and nobody minds if the answer is no. At the other end, the plan tells you what you owe and the year you had is not part of the conversation. 

That distinction matters more than the contribution limit does. A plan that lets you save a hundred thousand dollars is worthless if you cannot fund it in a drought year, and expensive if walking away costs you more than staying in. 

So before anything else: if the next three years are average, and one of them is bad, can you still do this? If the honest answer is no, you belong lower on the ladder than the contribution math suggests. 

Traditional and Roth IRAs: where most people should start 

Not a business plan at all, which is exactly the point. If money is tight, if the business is young, or if you are not sure what next year looks like, this is the right rung. 

Contribution limits are modest. Administration is essentially nothing, and there is no cost to run one. You decide every April whether to fund it, and nothing happens if you skip a year. 

Who it is for: an owner who is just getting going, someone with irregular income, or anyone who wants to start the habit without taking on an obligation. 

Cost to run: effectively zero. 

The commitment question: there isn't one. That is the whole appeal. 

When it stops making sense: when the limit becomes the constraint. If you are turning away savings you would otherwise make, it is time to look up the ladder. Worth noting that a Roth is the one place on this ladder where you pay tax today at a rate you know, and never pay it again on the growth. In a year where your income is unusually low, that is worth more than a deduction. 

SEP IRA: simple, flexible, and it waits for you 

For a self-employed owner or a business with very few employees, a SEP is often the right first business plan. 

Employees cannot defer their own pay. The business makes the contribution, and for 2026 that can reach 25% of eligible compensation up to $72,000 per participant. 

One important correction most articles skip. That 25% applies to W-2 compensation in an incorporated business. If you file a Schedule F or Schedule C, the effective limit works out closer to 20% of net earnings after the self employment tax adjustment. A producer with $120,000 of net farm income is looking at roughly $20,000, not $30,000. Run the actual number before you plan around it. 

Who it is for: an owner who wants meaningful contributions with almost no administration. 

Cost to run: roughly $0 to $500 a year. 

The commitment question: low. The contribution is discretionary year to year, so a thin year simply means a smaller contribution or none at all. 

The flexibility that matters most here: a SEP can be established and funded by your tax return deadline including extensions. For an operation with income you cannot pin down until the grain is sold and the year is closed, that is genuinely valuable. You get to look at the finished year before deciding what to put in. 

When it stops making sense: eligible employees generally have to get the same contribution percentage you give yourself. That is fine with one or two people and expensive with six. 

The trap nobody mentions: SEP eligibility looks back three of the last five years. Seasonal help, harvest crews, part-time people you have used repeatedly, all of them can become eligible without you realizing it. Check the census before you fund, not after. 

Solo 401(k): the better answer for most one-person operations 

If it is just you, or you and a spouse, this usually beats a SEP and it is not close. 

The reason is that you contribute twice. Once as the employee, deferring up to $24,500 for 2026, and again as the employer, at roughly the same percentage a SEP would allow. Both land in the same account, against the same overall limit. 

Take that same producer with $120,000 of net farm income. A SEP gets him to roughly $20,000. A solo 401(k) gets him to that same $20,000 as the employer contribution, plus up to $24,500 as an employee deferral. Same income, more than twice the retirement savings. 

Who it is for: owner-only businesses, including those with a spouse on the payroll. 

Cost to run: roughly $0 to $750 a year, depending on the provider. Once plan assets pass $250,000 you have an annual Form 5500-EZ filing, which is a small task, not a burden. 

The commitment question: low. Both pieces are discretionary. 

When it stops making sense: the moment you hire a non-spouse employee who works enough hours to become eligible, it is no longer a solo plan. That is not a disaster, but the plan has to convert and testing enters the picture. If you are a year away from bringing someone on full time, plan for it now. 

SIMPLE IRA: when you have a small crew 

A SIMPLE lets employees contribute through payroll while the business makes either a match or a nonelective contribution. For 2026 the standard employee deferral is $17,000, plus catch-up for eligible older participants. 

Who it is for: a small business that wants to offer a real benefit without 401(k) administration. 

Cost to run: roughly $0 to $1,000 a year for administration. Employer contributions are separate and they are the real cost. You are matching up to 3% of compensation or making a 2% nonelective contribution for everyone eligible. 

The commitment question: moderate, and higher than it looks. The employer contribution is required every year, not discretionary. There is a two year rule on rollovers out of a SIMPLE that carries a stiff penalty for early moves. And you generally cannot run a SIMPLE alongside another plan, so starting one closes doors for as long as it is open. 

When it stops making sense: when the deferral limit constrains what you want to save personally. It is a good employee benefit and a mediocre owner savings vehicle. 

Deadline that catches people: a new SIMPLE generally has to be established by October 1 for that calendar year. There is no fixing it in March. 

Safe Harbor 401(k): when the owner wants to save seriously 

Here is the problem a Safe Harbor solves. A traditional 401(k) runs nondiscrimination and top-heavy testing, and if your employees do not participate much, those tests cap what the owner can defer. You end up with a plan you paid for that will not let you use it. 

A Safe Harbor design sidesteps most of that testing by committing the employer to a specific contribution for eligible employees. You are buying your own contribution room by guaranteeing theirs. That is the trade, and it is a fair one. 

For 2026, employees can defer up to $24,500 plus catch-up. 

Who it is for: a profitable business where the owner wants to max out and the employee group would otherwise fail testing. 

Cost to run: roughly $1,500 to $4,000 a year for recordkeeping, administration, and compliance, plus setup. Required employer contributions are on top of that and are usually the larger number. 

The commitment question: real. The Safe Harbor contribution is locked in for the plan year once you give notice. You cannot decide in November that you would rather not. Turning it off mid-year is possible in narrow circumstances and it is not a lever you want to plan around. 

Do not start one off a single good year. If the reason you are looking at this is that 2026 came in high, that is the wrong reason. Look at the last four years and the next two. 

When it stops making sense: inconsistent cash flow, or an owner who is not actually going to contribute much. If you are not using the room you paid for, the simpler plan was better. 

Profit sharing: the discretionary layer on top 

This is the piece that is usually missing from these comparisons, and it is the one that fits a variable income business best. 

A profit sharing contribution bolts onto a 401(k) and it is discretionary. Good year, you fund it. Thin year, you skip it. It lets you push total contributions up toward the overall limit without adding a permanent obligation. 

Better still, the allocation formula does not have to be flat. A new comparability or age-weighted design can direct a larger share toward owners and older participants, within testing limits. For an operation where the owner is fifty-five and the crew is in their twenties, that can move real money. 

Who it is for: any business already running a 401(k) that wants upside in good years without commitment in bad ones. 

Cost to run: a few hundred to a couple thousand a year on top of the 401(k), more if you use a cross-tested design that requires annual testing. 

The commitment question: low, which is the whole point. One caveat: the IRS expects contributions to be substantial and recurring. Funding it once a decade invites questions about whether it is a real plan. 

Why it belongs in this conversation: a Safe Harbor plus discretionary profit sharing is often the right structure for an operation with good years and bad ones. Fixed obligation stays small, upside stays available. 

Cash balance plans: the heavy artillery, and the one to be careful with 

This is where the numbers get large and so does the commitment. It deserves more explanation than the rest combined. 

A cash balance plan is a defined benefit plan. That word matters. You are not deciding how much to put in, you are promising a benefit, and an actuary calculates each year what the business owes to stay on track. If investments underperform, the required contribution goes up. The plan tells you the number. 

It is almost always paired with a 401(k) and profit sharing, because the point is stacking. 

What it can actually do. Contribution room is driven mainly by age, since the plan has fewer years to fund an older owner's benefit. General ranges, and your actuary will give you the real figure: 

• Owner around 45: roughly $100,000 to $150,000 a year 

• Owner around 55: roughly $180,000 to $250,000 a year 

• Owner around 62: roughly $250,000 to $350,000 a year 

Stack that on a 401(k) deferral and profit sharing and a fifty-five year old owner can be sheltering north of $280,000 in a single year. At a marginal rate in the low forties, that is well over a hundred thousand dollars of tax deferred annually. The numbers are why people look at these. 

Who it is for: a high income owner with predictable cash flow, generally within fifteen years of retirement, who has already maxed the simpler options and still has income to shelter. 

Cost to run: roughly $3,000 to $8,000 a year plus $1,500 to $3,000 or more in setup, and a required actuarial certification annually. Complex designs cost more. Employee contributions are separate and can be significant, because employees generally have to receive a meaningful benefit for the plan to pass testing. 

The commitment question, and this is the whole ballgame. The IRS expects a cash balance plan to be permanent. In practice that means planning to fund it for at least three to five years. Terminating early without a good business reason risks disqualification, and a plan that is underfunded when you terminate has to be topped off before you can close it out. 

So the rule is simple. Do not open a cash balance plan because you had a big year. Open one because you expect to have five of them. An operation that funds a large contribution off a spike year and then hits a drought is looking at a required contribution in a year with no income to cover it, and no clean way out. 

When it stops making sense: fluctuating income, a large or young employee base, or an owner who does not have a decade of high earnings ahead. If any of those describe you, the Safe Harbor plus profit sharing structure gets you most of the benefit with none of the obligation. 

So which one is right? 

There is no best plan. There is a plan that fits. 

Just starting, money is tight, income unpredictable. Traditional or Roth IRA. No cost, no commitment, and you can step up whenever the business gives you a reason. 

One-person operation with real income. Solo 401(k), nearly every time. If administration bothers you or you want to decide after the year closes, a SEP is the simpler cousin. 

A crew of three to ten, and the goal is a benefit for them. SIMPLE IRA, understanding the employer contribution is required and the deferral limit is low. 

Profitable, owner wants to max out, employees will not carry the testing. Safe Harbor 401(k), and add discretionary profit sharing so your good years have somewhere to go. 

High income, steady, ten to fifteen years to retirement, already maxing everything else. Cash balance, if and only if you can commit to funding it through a bad year. 

Administrative cost is only part of the decision. A $3,000 plan is cheap if it lets you shelter another $150,000. A $500 plan is expensive if it constrains you. 

Why we are talking about this in August 

Because several of these doors close before you file. 

A SEP can be established and funded by your return deadline including extensions, which is the most forgiving timeline on the list. A new SIMPLE generally has to be in place by October 1. A Safe Harbor 401(k) requires advance employee notice and payroll coordination, so it needs to be set up well before year end. A cash balance plan takes an actuary, a plan document, and real lead time. 

Waiting until tax season does not just make it harder. For most of these, it makes it impossible for the year you are trying to affect. 

August is the right time to look at income, payroll, cash flow, and how many years you can realistically commit. 

The bottom line 

You do not need a big company to have an effective retirement plan. You need one that matches the business you are actually running and the years you can actually fund. 

The best plan is not the one with the highest limit. It is the one still working for you in year four. 

If you are weighing an IRA, a SEP, a solo 401(k), a SIMPLE, a Safe Harbor 401(k), or a cash balance plan, we are happy to run the numbers with you. 

Administrative cost estimates are general ranges. Actual costs vary by provider, plan design, participant count, investments, and services. Employer contributions are additional. Contribution figures reflect 2026 limits. 

Swanson Agency. Montana Roots. Future Focused.