Small business retirement plan strategy

The main retirement plan options for small businesses are the SEP-IRA, the SIMPLE IRA, the solo 401 k, and the defined benefit plan, and they differ mostly in how much you can put away and deduct. The SEP-IRA lets an employer contribute up to 25 percent of compensation, capped at 70,000 dollars for 2026, with almost no paperwork. The solo 401 k, meant for an owner with no employees other than a spouse, allows an employee deferral of 24,000 dollars plus an employer share, often reaching a similar or higher total at a lower income than the SEP. The SIMPLE IRA carries lower limits but suits a small staff, and the defined benefit plan can shelter far more for an older high earner. The IRS lays out all of these in Publication 560.

Deduction size is where owners feel the difference. Employer contributions to any of these plans are generally deductible to the business, which lowers taxable profit dollar for dollar. Suppose a sole proprietor nets 200,000 dollars. A SEP contribution could reach roughly 37,000 dollars after the self-employment tax adjustment, cutting taxable income by that amount and saving perhaps 8,800 dollars in federal tax at a 24 percent rate. A solo 401 k at the same income often allows more, because the flat 24,000 dollar deferral stacks on top of the percentage-based employer piece. The right pick depends on your profit and your age. Whether you employ anyone else can rule some plans out entirely. The IRS small business and self-employed center is a useful starting map.

There is no single best plan, only the best plan for a given set of numbers. A small business retirement plan strategy has to fit the owner’s age as well as the profit. A young owner with modest profit and a wish for simplicity may favor the SEP. An owner who wants to put away the largest possible amount on a middle income often does better with the solo 401 k. A 55 year old with high, steady profit and few employees might shelter 150,000 dollars or more a year in a defined benefit plan. We size each option against your actual books, and clients who want that side-by-side comparison can request a consultation and we will run it on real figures. Our tax strategy consulting team builds the model. The Reed Corporation is a CPA and tax firm rather than a registered investment adviser, and it does not sell or manage retirement products, so the account itself is opened with your own custodian or advisor while we handle the tax and payroll side.

New plans come with their own tax break that owners often miss. A small employer that starts a qualified plan can claim a federal credit for part of the setup and administration cost for the first three years, and a business with employees may add a further credit for automatic enrollment. That credit can cover a large share of the early cost of a 401 k or a SIMPLE IRA, which changes the math against a no-cost SEP. Suppose the third-party cost of a new 401 k runs 4,000 dollars in year one. A startup credit could offset a meaningful part of that, so the plan that looked pricey on paper lands much cheaper after tax. The credit is claimed on the business return, not the personal one. We check whether a new plan qualifies before you rule it out on cost, because the after-credit price often beats the sticker price.

The common mistake is picking a plan from a headline limit without checking eligibility. A SEP that looks generous forces the same percentage for every eligible employee, which can get expensive once you have staff. A solo 401 k stops being available the moment you hire a non-spouse full-time worker. Owners also forget that the deduction has to be supported by clean payroll and books, not a year-end guess. Choose the plan that matches both your cash flow and your headcount, and revisit it as the business grows, because the plan that fits at 100,000 dollars of profit is rarely the one that fits at 500,000 dollars.

Among the retirement plan options for small businesses, the SEP-IRA and the solo 401 k draw the most questions because their limits look similar until you run real numbers. Both cap total 2026 additions at 70,000 dollars, but they reach it differently. The SEP is purely an employer contribution of up to 25 percent of compensation. The solo 401 k splits into two parts, an employee deferral of up to 24,000 dollars that does not depend on a percentage, plus an employer contribution of up to 25 percent of compensation. Because the flat deferral sits on top, the solo 401 k usually lets a mid-income owner reach a higher total than a SEP at the same earnings.

Put numbers to it. An S-Corporation owner who pays herself 100,000 dollars in W-2 wages can defer 24,000 dollars as the employee and add 25,000 dollars as the employer, a 25 percent employer contribution, for 49,000 dollars total in a solo 401 k. A SEP on that same 100,000 dollar salary caps the employer piece at 25,000 dollars, so the SEP tops out near 25,000 dollars against the solo plan’s 49,000 dollars. The employer portion is deductible to the business either way, and for the SEP-based accounts the underlying IRA contribution rules appear in Publication 590-A. The full plan comparison sits in Publication 560.

For a self-employed person without a corporation, the math uses net earnings from self-employment rather than a W-2 salary, and the effective employer rate works out to about 20 percent after the deduction for half of self-employment tax. That is why a sole proprietor with 100,000 dollars of net profit sees a smaller SEP number than an S-Corporation owner paying a 100,000 dollar salary. Neither structure is automatically better, since the S-Corporation route adds payroll tax on the wage base. We weigh the plan choice and the entity choice together rather than in isolation, which is the work of our tax strategy consulting practice.

Two ceilings cap these numbers no matter how much you earn. The first is the annual compensation limit, 350,000 dollars for 2026, which is the most pay that can be counted when figuring a percentage-based contribution. An owner earning 500,000 dollars still computes the 25 percent employer piece on 350,000 dollars, not the full pay. The second is the 70,000 dollar total additions cap that applies to each plan. A solo 401 k owner who is 50 or older can also add the 8,000 dollar catch-up on top, lifting the personal total near 78,000 dollars in the right year. These caps are the reason a very high earner who wants to shelter more than 70,000 dollars often looks past the SEP and the solo 401 k toward a defined benefit plan. A small business retirement plan strategy that ignores these ceilings produces a contribution figure that will not hold up at filing time. Run the percentage on the capped compensation rather than the headline salary, and the deduction figure comes out right the first time. Knowing these caps ahead of time keeps a planned contribution from bumping into a limit at filing.

The common mistake is basing the solo 401 k employer contribution on the wrong compensation figure, or forgetting that the 24,000 dollar deferral is one figure per person even if you also defer at a second job. Another slip is contributing more than the business can afford in a soft year, then scrambling for cash to fund the promised amount. Match the contribution to real profit, document the salary that supports it, and the deduction stands up if anyone asks. As your income climbs, the gap between these two plans widens, so the choice you make today deserves a fresh look every year.

Timing decides which plans are even available for a given tax year, so the deadlines deserve as much attention as the limits. Any small business retirement plan strategy has to survive a year when cash is tight, and the calendar is where that pressure shows up first. A SEP-IRA is the most forgiving. You can open and fund it as late as the due date of the business return, including extensions, which means you can set up a SEP in the fall and still deduct the contribution for the prior year. That flexibility makes the SEP a common rescue plan when a profitable year is clear only after the books close. Publication 560 on retirement plans for small business spells out each deadline.

The solo 401 k is stricter on one point. Under current rules a sole proprietor can adopt a solo 401 k as late as the tax filing deadline and still make employer contributions for the prior year, but the employee deferral election generally has to be in place by the end of the plan year for a going business. In practice that means you cannot wait until April and then claim a large elective deferral for the year just ended unless the plan and your deferral election existed in time. A SIMPLE IRA has the tightest calendar, since it must be established by October 1 of the year it takes effect for most employers. Miss that date and the SIMPLE is off the table until the next year. The IRS small business and self-employed center outlines the employer side of these rules.

Funding deadlines differ from setup deadlines, and people mix them up. Even when a plan is open, the employer contribution generally has to be deposited by the return due date with extensions to be deductible for that year. Say a calendar-year business extends its return to September. It can fund the prior-year SEP or employer 401 k contribution any time up to that September date and still take the deduction. Our bookkeeping team tracks these dates against your books so a deduction does not slip because a deposit landed a week late.

A rule change from recent law helps late deciders. A business can now adopt a new qualified plan, including a 401 k, as late as the due date of its return with extensions and still count it for the prior year, though employee deferrals can only start once the plan exists. That gives an owner who had a strong year a second chance to add a profit-sharing or employer contribution after the year closes. The SIMPLE IRA sits outside that relief, which is why its October 1 setup date is so easy to miss. Employers also owe workers a notice before each SIMPLE plan year, and skipping it can carry a penalty. Suppose a firm nets 250,000 dollars and only grasps the size of the profit in February. It can still open a SEP or a qualified plan and fund an employer contribution before the extended deadline. We calendar every one of these dates so a strong year is not wasted on a missed filing.

The common mistake is assuming every plan works like a SEP. An owner decides in March to shelter last year’s profit, tries to open a SIMPLE IRA, and learns the October 1 window closed months earlier. Another extends the return, plans to fund the contribution, then lets the extended deadline pass with the account still empty, which forfeits the deduction entirely. Mark the setup and funding dates the moment you pick a plan, and confirm the deposit cleared before the extended due date. A small business retirement plan strategy lives or dies on that calendar, so getting it right this year protects a deduction that is easy to lose to a missed date.

An S-Corporation owner has one feature the sole proprietor does not, a W-2 salary, and that salary is the base for every retirement number. When we compare retirement plan options for small businesses for an S-Corporation owner, the wage figure drives the whole calculation, because both the elective deferral and the percentage-based employer contribution are measured against W-2 wages, not the company’s total profit or distributions. A small business retirement plan strategy for an S-Corporation owner therefore begins with the wage rather than with the plan document. Set the salary too low and you shrink the contribution room. Set it purely to inflate the plan and you may cross into unreasonable compensation. The wages you run appear on the owner’s Form W-2, and the corporation reports its results on Form 1120-S.

Here is how the coordination plays out. An owner paying herself 120,000 dollars in wages can defer 24,000 dollars from those wages into a solo 401 k as the employee, then have the S-Corporation contribute up to 25 percent of the 120,000 dollars, or 30,000 dollars, as the employer. The 30,000 dollar employer contribution is a business deduction on the 1120-S, while the 24,000 dollar deferral reduces the owner’s taxable wages. The deferral has to run through payroll before year end, since it comes out of actual paychecks, so a December catch-up only works if there is enough remaining salary to withhold it from. This is why the plan and the payroll calendar have to move together.

The reasonable compensation rule is the pressure point. The IRS expects an S-Corporation owner to take a fair wage for the work performed before taking distributions, and the S election itself is made on Form 2553. A salary set only to hit a retirement target, with little relation to the job, invites a challenge that can reclassify distributions as wages. On the other side, a salary set too low to save payroll tax also caps the retirement contribution, so the two goals pull against each other. Our bookkeeping and tax strategy consulting teams set the wage where it supports both a defensible payroll position and the contribution you want.

The payroll tax treatment is where the S-Corporation structure pays off. An employee 401 k deferral still counts as wages for Social Security and Medicare tax, so the deferral lowers income tax but not payroll tax. The employer contribution is different. It is not wages at all, so it escapes both income and payroll tax on the way in, which makes the employer piece the more tax-favored dollar. On the owner’s W-2, the deferral shows in box 12 while the employer contribution never appears there. The corporation deducts the employer contribution on its return, lowering the profit that passes through to the owner’s personal return. A 130,000 dollar salary paired with a 26,000 dollar employer contribution shifts that 26,000 dollars out of taxable pass-through income entirely. We set the payroll codes correctly during the year so the deduction is clean and the W-2 matches the plan records at filing time.

The common mistake is deciding on the retirement contribution in December after payroll has already run, then finding the salary base was too low to support it. Because the employer contribution is a percentage of wages, a 60,000 dollar salary caps the 25 percent employer piece at 15,000 dollars no matter how profitable the company was. Plan the wage at the start of the year with the target contribution in mind, and adjust payroll through the year rather than at the buzzer. Setting the salary and the plan together each January keeps both the payroll tax and the retirement deduction working in your favor.

The retirement plan options for small businesses each carry a tradeoff, and the SIMPLE IRA and the defined benefit plan sit at opposite ends of that range. A SIMPLE IRA fits a small business with a handful of employees that wants to offer something without the cost of a full 401 k. Employees can defer up to 16,500 dollars in 2026, and the employer must either match up to 3 percent of pay or contribute 2 percent for everyone eligible. The limits are lower than a 401 k, but the administration is light and the required employer contribution is modest. The plan rules appear in Publication 560.

A defined benefit plan is the opposite animal. Instead of a contribution limit, it works backward from a target pension benefit and can allow contributions well above 100,000 dollars a year for an older owner with high, steady income. Picture a 55 year old consultant netting 400,000 dollars with no employees. A defined benefit plan might permit a deductible contribution near 200,000 dollars, far beyond any SEP or 401 k, because the actuary calculates the amount needed to fund the promised benefit over a short remaining career. The tradeoff is commitment. A defined benefit plan expects a similar contribution every year, and an actuary has to certify it, so it suits stable profit rather than a boom-and-bust income.

Employee coverage is the swing factor for both. A SIMPLE IRA and a defined benefit plan both generally have to include eligible employees, which raises the cost once you have staff, and the payroll side is described on the IRS employment taxes pages. The owner’s own contribution and distribution figures eventually flow to the personal return we prepare through our individual tax return service. A defined benefit plan for a solo owner is powerful, but add three employees and the required contributions for them can outweigh the owner’s tax saving.

Higher earners sometimes pair two plans. A defined benefit plan, or its cousin the cash balance plan, can run alongside a solo 401 k so the owner captures both the large actuarial contribution and a smaller deferral. Pairing plans is the most advanced form of a small business retirement plan strategy, and it belongs to owners whose profit has been steady for several years. The combined deduction for a 55 year old with strong profit can reach well past 250,000 dollars in a single year, though the yearly funding promise and the actuary fee come with it. A cash balance plan states each worker’s benefit as a growing account balance, which many owners find easier to read than a traditional pension formula. These structures reward stable, high income and punish a year when cash runs short, so they suit a mature practice more than a young one. Before setting one up, model at least five years of expected profit, because you are committing to fund the plan across good years and lean ones alike. We build that multi-year projection so the commitment is entered with open eyes.

The common mistake is reaching for the largest deduction without weighing the staff cost or the yearly commitment. An owner sets up a defined benefit plan in a banner year, then faces a required contribution in a lean year and cannot fund it comfortably. Another buys a SIMPLE IRA and later wishes for the higher solo 401 k limits once profit grows. Match the plan to the stability of your income and the size of your payroll, not just to this year’s tax bill. As the business and the headcount change, the plan that fits should be reviewed, because the right answer at one stage is often the wrong one at the next.