SEP or Employer 401(k): Compare the Full Employee Budget

Compare actual proposals rather than plan labels

A profitable owner comparing a SEP with a 401(k) should use the same employee census, compensation assumptions, and year for both proposals. IRS guidance describes different contribution and administration features. A lower advertised setup cost does not establish which plan produces the best complete result. Request illustrations from qualified providers that show owner funding, employee funding, administration, payroll work, and relevant limitations separately.

Collect employees’ dates of birth, hire dates, compensation, hours or service information as requested, ownership relationships, and existing plan participation. Include related businesses in the discussion with the administrator. The analysis should explain who is eligible under each proposed document rather than exclude employees informally because they work part time or are not expected to stay.

A hypothetical employer-cost comparison

Assume a business has an owner with $200,000 of compensation and three employees whose combined compensation is $180,000. In a simplified SEP illustration using a ten-percent contribution rate for all eligible participants, employer funding would be $20,000 for the owner and $18,000 for employees, or $38,000 total. Actual eligibility, compensation definitions, limits, and deduction treatment require professional review; the example only demonstrates the full-population budget.

Now suppose a provider presents a 401(k) design with different employee and employer contribution features. Do not compare the owner’s total account contribution in that proposal with only the owner’s $20,000 SEP employer amount. Separate employee deferrals from employer funding and compare who supplies each dollar. The company’s cash budget and the owner’s personal contribution capacity are related but different measures.

Request a written side-by-side using the provider’s actual compliant design. Include administration, testing where relevant, recordkeeping, payroll integration, and any required employer contributions. The owner should understand why the totals differ and which assumptions would change if an employee receives a raise or becomes eligible. A proposal showing only the founder’s projected benefit conceals the cost of maintaining the arrangement for everyone covered.

Test flexibility in a weak year

Prepare a lower-profit case with the same employee population. Ask the administrator which contributions are discretionary, which commitments remain, and what changes would require amendments or notices. Do not assume every employer contribution can be stopped immediately because the owner wants to preserve cash. The adopted document and applicable rules govern the actual flexibility.

Consider the operating burden as well as the dollar total. A payroll deferral arrangement requires accurate elections, deposits, and reconciliation. An annual employer-funded process still requires eligibility and contribution administration. Name who will handle each task and how the company will confirm funding reached the accounts. A plan can be commercially attractive yet poorly implemented if the owner has no process for the recurring work.

Choose with a written decision file

Keep the census, proposal versions, cost comparison, compensation assumptions, provider explanation, and adoption documents. Identify the selected design and why it fits the business’s expected cash and workforce. Confirm setup deadlines and operational instructions before promising benefits to employees or transferring money. The tax preparer should receive the final document information and contribution schedule, not an obsolete sales illustration.

Review the choice annually with actual participation, compensation, and fees. This guide does not select a retirement plan or establish contribution limits. It gives the owner an evaluation framework that makes employee cost and administrative commitments visible alongside personal savings. The useful comparison answers what the company funds, what the owner defers, what employees receive, and what the business must do to administer the chosen arrangement correctly.

If proposals use different compensation years or employee assumptions, have them revised before deciding. A superficially cheaper plan may simply be omitting a participant or assuming lower payroll. Reconcile those inputs first so the commercial comparison reflects genuine design differences rather than inconsistent data.

Ask employees what information they need to make participation decisions, without treating their current preferences as permanent exclusions. A design that depends on everyone declining a benefit should be evaluated carefully under the actual rules. The administrator’s illustration should distinguish permitted assumptions from outcomes that depend on future employee elections, and the owner should budget for the supported range.