Choosing a retirement plan can change more than the amount employees save. It can change your payroll workflow, your annual filing calendar, the employer contribution you must fund, and what happens when a participant wants to move the money later.
For 2026, the basic employee contribution limit is $17,000 for both a SIMPLE IRA and a SIMPLE 401(k). That similarity is useful, but it can hide the important differences. A SIMPLE IRA is usually lighter to administer and generally has no annual Form 5500 filing. A SIMPLE 401(k) offers a qualified-plan structure, including optional participant loans, but it brings more recordkeeping and an annual filing obligation.
Here is how to compare the two before you put either one into your payroll system.
The short answer
| Question | SIMPLE IRA | SIMPLE 401(k) |
|---|---|---|
| Who can generally use it? | Employers with 100 or fewer employees who earned at least $5,000 in the preceding calendar year | Generally the same 100-employee and $5,000 compensation test |
| 2026 basic employee deferral limit | $17,000 | $17,000 |
| Employer contribution | Match up to 3% or 2% nonelective contribution | Match up to 3% or 2% nonelective contribution |
| Annual nondiscrimination testing | Not required | Not required if the plan satisfies SIMPLE 401(k) rules |
| Employer contributions vested | 100% immediately | 100% immediately |
| Annual Form 5500 | Generally not required | Required |
| Participant loans | Not permitted | Permitted if the plan document allows them |
| Special 25% early-distribution tax during first two years | Yes, subject to exceptions | No SIMPLE IRA two-year rule; normal 401(k) distribution rules apply |
The right choice depends on whether your priority is the lightest administration or the flexibility of a qualified 401(k) plan. Your plan provider and tax professional should confirm the final design before enrollment begins.
What both plans have in common
The same basic small-employer boundary
Both arrangements are designed for a business with no more than 100 employees who received at least $5,000 in compensation during the preceding calendar year. Count the employees and compensation carefully. Related businesses, controlled groups, acquisitions, and employees who worked at any point during the year can affect the calculation.
Neither plan is a workaround for sponsoring multiple retirement plans for the same employees. Generally, an eligible employee cannot participate in a SIMPLE plan while receiving contributions or accruing benefits under another employer plan in the same year, subject to limited exceptions. If your company has several entities or an existing 401(k), get that structure reviewed before you promise a SIMPLE plan in an offer letter.
The same required contribution formulas
The employer generally chooses one of two formulas:
- A dollar-for-dollar match on employee salary reductions, up to 3% of compensation.
- A 2% nonelective contribution for each eligible employee, whether or not that employee contributes.
The choice affects both your budget and the employee experience. A match rewards participation but can cost less when employees do not defer. A nonelective contribution is easier to explain as a broad benefit, but it is owed to eligible employees even when they contribute nothing.
For 2026, compensation used in the contribution calculation is generally capped at $360,000. The plan document and current IRS limits control the calculation, so do not let a payroll system silently apply last year’s cap.
The same 2026 deferral limits—with an important age distinction
The basic employee salary-reduction limit for a SIMPLE plan is $17,000 in 2026. Participants age 50 or older by the end of the year may generally contribute an additional $4,000 catch-up amount, for a total of $21,000.
SECURE 2.0 provides a higher SIMPLE-plan catch-up limit for participants who turn 60, 61, 62, or 63 during 2026. That higher catch-up amount is $5,250, making the potential total $22,250 for those participants. Payroll must identify the applicable age band rather than treating every older participant as having the same limit.
There is also a higher basic limit of $18,100 for certain SIMPLE plans and eligible employers under the special statutory rules. Whether it applies depends on the employer and the plan design. Ask the plan provider which limit your plan uses and document that answer before setting payroll caps.
If an employee participates in another employer plan during the year, the employee’s combined salary reductions may be subject to an overall limit. The employee should coordinate contributions across plans rather than assuming that each payroll system can apply its own limit independently.
Why a SIMPLE IRA is often the lower-maintenance option
A SIMPLE IRA uses individual IRA accounts for participants. The employee owns the account, and a financial institution generally handles much of the account administration after you adopt the plan document and set up the contribution process.
For the employer, the practical advantages are significant:
- There is generally no annual Form 5500 return.
- Contributions are always 100% vested.
- Annual nondiscrimination testing is not required.
- Participant loans are not available, so there is no loan program to administer.
- The plan can be relatively inexpensive and straightforward for a small payroll team.
That simplicity does not mean “set it and forget it.” You still have to provide the required annual notice, apply the promised contribution formula, deposit employee deferrals on time, and maintain records showing who was eligible and how each contribution was calculated.
For a business with a small team, no need for loans, and a preference for a simple payroll-to-custodian workflow, the SIMPLE IRA is often the easier fit.
Why a SIMPLE 401(k) may justify extra administration
A SIMPLE 401(k) is still a simplified plan, but it lives inside the 401(k) framework. It can offer features that a SIMPLE IRA cannot, most notably participant loans and hardship withdrawals when the plan document permits them. Those features may matter when employees value access to a plan loan or when you want the benefit to feel familiar to workers who have used a 401(k) before.
The tradeoff is administrative work. A SIMPLE 401(k) generally requires an annual Form 5500 filing, and the plan needs a recordkeeping and compliance process that can track participant accounts, investments, distributions, and any loans. Required employer contributions must be fully vested, just as they are in the SIMPLE IRA.
The plan avoids the annual nondiscrimination tests that apply to a traditional 401(k) when it satisfies the SIMPLE 401(k) requirements. That does not eliminate every compliance responsibility. You must follow the plan document, cover the right employees, make the required contributions, provide participant information, and keep the annual filing on your calendar.
Choose a SIMPLE 401(k) because its features solve a real workforce or owner need—not simply because “401(k)” sounds more complete. If no one needs loans or other qualified-plan features, the additional filing and recordkeeping may not buy you much.
The SIMPLE IRA 2-year rollover rule
The most expensive surprise in this comparison belongs to the SIMPLE IRA.
The special two-year period starts on the first day the employer deposits contributions into an employee’s SIMPLE IRA. During that period, a participant can generally make a tax-free transfer only to another SIMPLE IRA. Moving the money directly to a traditional IRA or a regular 401(k) during the restricted period does not receive the usual tax-free rollover treatment.
An early SIMPLE IRA distribution can also face a 25% additional tax instead of the usual 10% early-distribution tax, unless an exception applies. The two-year clock is tied to first participation and first deposit—not to the employee’s hire date and not to the date the account was opened online.
After the two-year period, a participant can generally transfer the balance to a traditional IRA or an eligible employer plan. A conversion to a Roth IRA is a different transaction: the untaxed amount generally becomes taxable income in the year of conversion.
The special 25% rule is a SIMPLE IRA issue. Do not copy it into a SIMPLE 401(k) employee handout. A SIMPLE 401(k) follows the distribution restrictions that apply to qualified 401(k) plans, including any plan-specific rules for loans and hardship distributions.
Deadlines that belong on your 2026 calendar
SIMPLE IRA setup and employee notice
A new SIMPLE IRA plan can generally be effective on a date from January 1 through October 1 if the employer did not previously maintain a SIMPLE IRA plan. A new employer that comes into existence after October 1 has a special setup rule. Existing SIMPLE IRA plans generally operate on a calendar-year basis and cannot simply be ended midway through the year.
For a calendar-year plan, the regular employee election period is generally the 60-day period before January 1, commonly November 2 through December 31. Before that period, give eligible employees the information they need about salary-reduction elections, the employer contribution formula, and the account arrangement.
Employee salary reductions must generally reach the SIMPLE IRA within 30 days after the end of the month in which the amounts would otherwise have been paid in cash. Department of Labor rules can require faster deposits for plans subject to them; the seven-business-day safe harbor for small plans is a useful operational target, not a reason to hold money longer.
Employer matching or nonelective contributions are generally due by the due date of the business’s federal income tax return, including extensions, for the relevant year. Your payroll and tax calendars should track those contributions separately from employee deferrals.
SIMPLE 401(k) reporting
The SIMPLE 401(k) also requires timely employee notices and deposits under its plan document. In addition, put the annual Form 5500 filing on the compliance calendar. For a calendar-year plan, the normal deadline is the last day of the seventh month after the plan year ends—July 31—unless an extension applies.
Confirm who is responsible for the filing. “The provider handles it” is not a control until you know which provider, which form, which deadline, and where the filed copy will be stored.
Build the bookkeeping workflow before the first deduction
Retirement-plan errors often start as bookkeeping errors. A payroll deduction can be correct on an employee’s pay stub and still be missing from the custodian’s account. An employer match can be funded but posted to the wrong plan year. A Form 5500 can be due while the records needed to support it are scattered across payroll exports and email.
Create separate accounts or tracking categories for:
- Employee retirement deductions payable.
- Employer matching contributions or nonelective contribution expense.
- Contributions in transit between payroll and the financial institution.
- Plan fees, if the business pays them.
- Corrections, returned contributions, and participant loan activity for a SIMPLE 401(k).
At every payroll, reconcile the total employee deductions and employer contribution to the payroll register. When the provider confirms the deposit, clear the “in transit” balance against the bank transaction. At month-end, compare the payroll totals with the provider statement and investigate any timing difference instead of forcing the bank reconciliation to balance.
Keep the plan document, annual notices, eligibility calculation, contribution reports, deposit confirmations, provider statements, and filed Form 5500—if applicable—in one controlled record set. That file makes tax preparation easier and gives you an audit trail when an employee changes a deferral percentage or leaves during the two-year SIMPLE IRA period.
A decision checklist for a small employer
Before choosing, answer these questions:
- Do any employees need participant loans or qualified-plan hardship withdrawals?
- Is your team prepared to own an annual Form 5500 process?
- Can payroll identify the $17,000 limit, age-50 catch-up, and age-60-to-63 catch-up correctly?
- Will a 3% match or 2% nonelective contribution fit your cash-flow forecast?
- Are you already sponsoring another plan or operating related entities?
- Who will reconcile each payroll deposit and retain the evidence?
- How will you explain the SIMPLE IRA two-year rollover restriction to employees?
If the answers point to low administrative overhead and no need for loans, a SIMPLE IRA may be the practical starting point. If plan features and 401(k)-style account administration matter more, a SIMPLE 401(k) may be worth the extra compliance work.
Simplify Your Financial Management
Whichever plan you choose, clean payroll and contribution records make the deadlines easier to meet and the year-end close easier to defend. Beancount.io offers plain-text accounting that is transparent, version-controlled, and AI-ready, so you can keep the logic behind each financial entry visible instead of trapped in a black box.