For Small Businesses
401(k) administration.
Plan design, plan-document updates, contribution monitoring, transaction authorizations, and the annual Form 5500. We handle the plan-side work so you can focus on your business.
What we do
What a 401(k) plan administrator does.
A 401(k) plan has to follow a long list of IRS and Department of Labor rules. A plan administrator is the outside partner that keeps your plan inside those rules. We update the plan as laws change, help you choose a Safe Harbor or traditional design at setup, file Form 5500 each year, monitor contribution limits and fees, and authorize plan transactions like distributions before they go through.
Plan assets are held by American Estate & Trust, the custodian. Accuplan administers the plan. You focus on payroll and the business.
2026 at a glance
The numbers your plan runs against.
All limits below are 2026 figures from IRS Notice 2025-67. Numbers are reset every November for the year ahead.
At a glance
The figures every plan sponsor needs.
$24,500
Employee deferral limit
$72,000
Total contributions cap
$8,000
Catch-up at age 50+
$11,250
Super catch-up, ages 60-63
$160,000
HCE threshold
July 31
Form 5500 due date
How it works
A 401(k) plan in plain English.
What plan administration covers, what your plan has to file each year, what Safe Harbor actually buys you, and the SECURE 2.0 rules that affect plans starting in 2024-2026.
A few terms we'll use
- Plan document
- The written rulebook for the plan. Spells out who is eligible, when contributions go in, how the match works, and how the money comes out. Has to be on file before the first dollar is contributed.
- Recordkeeper
- Tracks each employee's balance, vesting, and investment elections. Often a separate vendor from the TPA.
- Safe Harbor
- A plan design that auto-satisfies the IRS non-discrimination rules. The trade-off is a guaranteed match or non-elective contribution to every eligible employee, in exchange for not having to pass the annual ADP and ACP tests.
- HCE
- Highly compensated employee. For 2026, anyone who earned more than $160,000 from the business in 2025, or owns more than 5% of the business. Several plan rules treat HCEs differently from rank-and-file employees.
- Form 5500
- The annual return for a 401(k) plan. Filed with the Department of Labor. The version depends on the plan size and structure (5500, 5500-SF, or 5500-EZ).
- LTPT
- Long-term part-time employee. Under SECURE 2.0, an employee with 500+ hours in two consecutive years has to be allowed to defer into the plan, even if they would otherwise be excluded.
What plan administration covers
The work that comes with running a 401(k) plan, beyond payroll deposits and investment elections.
Plan updates
The plan document is updated as laws change or your business needs change so the plan stays compliant and effective.
Plan design
At setup, the choices around Safe Harbor, employee eligibility, and distribution rules are made and the plan document is built around them.
Disclosures and filings
Form 5500 is filed each year and the IRS receives the required information about the plan. Audit support is provided when needed.
Monitoring
Contribution limits, fees, and reports are tracked so the plan stays current as rules and dollar amounts change.
Authorizations
Plan transactions like distributions are checked against the plan document before they are authorized.
Solo 401(k) option
For owner-only businesses, the same partner can administer a <a href="/business-accounts/self-directed-401k/">Solo 401(k)</a> with self-directed investment options.
Plan assets are held by American Estate & Trust as the custodian. Accuplan administers the plan. We are not the custodian and not the investment advisor.
Annual filings, by plan size
Every 401(k) plan files a return after year-end. The version depends on plan structure and headcount.
5500-EZ
One-participant plans
Required once total plan assets reach $250,000 at year-end. Owner-only or owner-plus-spouse plans. Form 5500-EZ.
5500-SF
Small plans
Plans with fewer than 100 participants at the start of the plan year. The version most multi-employee 401(k) plans use.
5500
Large plans
Plans with 100 or more participants. Triggers an independent audit requirement. Due seven months after plan year-end, extendable to ten.
Safe Harbor in plain English
A plan design that auto-satisfies the IRS non-discrimination rules in exchange for a guaranteed employer contribution. Many small employers choose Safe Harbor at setup because the cost is predictable.
Safe Harbor match
100% on the first 3% of pay, then 50% on the next 2%. A 4% effective match for an employee deferring 5% or more. Only employees who defer get the match.
Safe Harbor non-elective
3% of pay to every eligible employee, whether they defer or not. Predictable budgeting and protects coverage when participation is low.
Safe Harbor contributions are 100% vested immediately. The notice has to go out 30-90 days before each plan year. Adding Safe Harbor to an existing plan is straightforward, removing it mid-year is not.
SECURE 2.0 changes that affect 401(k) plans
A handful of rules from the Consolidated Appropriations Act of 2023 (Division T) that already apply to multi-employee 401(k) plans, with one big rule landing in 2026.
Mandatory auto-enrollment (2025)
New plans started after Dec 29, 2022 must auto-enroll eligible employees at 3-10%, escalating 1% per year. Older plans grandfathered. Small businesses (under 11 employees) and businesses under 3 years old exempt.
Long-term part-time eligibility (2025)
Employees with 500+ hours in two consecutive years can defer into the plan, even if otherwise excluded. Most pre-2020 plan documents need an amendment.
Roth catch-up for high earners (2026)
Employees with prior-year FICA wages over $150,000 must take their catch-up as Roth. Plans without a Roth option have to add one or stop accepting catch-ups from these workers.
Super catch-up, ages 60-63 (2025)
Workers age 60-63 can put in $11,250 in catch-up for 2026, instead of the standard $8,000.
RMD age 73 → 75 (2033)
Required distributions start at 73 today, moving to 75 starting in 2033. Roth 401(k) money is exempt for the original owner.
Higher cash-out threshold ($7,000)
The involuntary cash-out limit on terminated employees rose from $5,000 to $7,000 in 2024. Cleans up small abandoned accounts faster.
See the IRS RMD FAQ for the current rules.
How to start
Setting up your plan.
Four steps from sign-up to your first employee deferral. Most of the heavy lifting is the plan design conversation up front.
Pick a plan design
We walk through Safe Harbor, traditional, and profit-sharing options based on your headcount, owner mix, and savings goals. Most small employers land on Safe Harbor for predictable cost.
Sign the plan document
We draft the plan document and adoption agreement. You sign once. The document goes on file with us, not with the IRS.
Onboard your employees
Eligible employees enroll, pick their deferral percentage, and name beneficiaries.
Run the plan
Payroll sends contributions to the plan each pay period. The plan document, monitoring, authorizations, and the annual Form 5500 are handled on the administration side. You focus on your business.
Frequently asked
401(k) administration FAQs.
What is the difference between a plan administrator, a recordkeeper, and a custodian?
Three different roles on the same plan. The plan administrator owns the plan document, the disclosures, and the annual filing. The recordkeeper tracks each employee balance, vesting, and investment elections at the participant level. The custodian holds plan assets. On a small-employer plan, one or two vendors often cover all three, but the responsibilities are distinct. Accuplan administers the plan and American Estate & Trust serves as the custodian.
Do I need a Safe Harbor 401(k)?
You do not need one, but most small employers want one. A Safe Harbor plan automatically passes ADP and ACP testing in exchange for a guaranteed employer contribution. The cost: either a 100% match on the first 3% of pay plus 50% on the next 2% (a 4% effective match), an enhanced match of at least 4% on the first 5%, or a flat 3% non-elective contribution to every eligible employee. The trade is predictable: a known employer cost in exchange for no testing risk.
Which Form 5500 does my plan file?
It depends on plan size and structure.
- Form 5500-EZ. One-participant plans (owner only, plus spouse) once total assets reach $250,000 at year-end. Below that, no filing.
- Form 5500-SF. Small plans with fewer than 100 participants at the start of the plan year. The version most multi-employee 401(k) plans use.
- Form 5500. Large plans with 100 or more participants. Triggers an independent audit requirement.
Filings are due seven months after the plan year ends (July 31 for calendar-year plans), with one extension available to October 15 via Form 5558.
Are new 401(k) plans required to auto-enroll employees?
Yes, for plans started after December 29, 2022 and reaching plan years beginning in 2025. Under SECURE 2.0, new 401(k) plans have to automatically enroll eligible employees at a default deferral rate between 3% and 10%, escalating 1% per year up to a cap of at least 10% (no more than 15%). Employees can opt out or change the rate. Plans in place before December 29, 2022 are grandfathered. Small employers (fewer than 11 employees) and businesses less than three years old are also exempt.
When do long-term part-time employees become eligible?
Under SECURE 2.0, an employee who works 500 or more hours in two consecutive years has to be allowed to make elective deferrals, even if they would otherwise be excluded as part-time. The two-year rule replaced the original three-year SECURE 1.0 version starting in 2025. The employer is not required to match LTPT employees, only to let them defer. This rule is one of the more common reasons a plan ends up needing an amendment, since most plan documents written before 2020 do not address it.
Are catch-up contributions for high earners required to be Roth?
Starting in 2026, employees age 50 and over with prior-year FICA wages above $150,000 from the business sponsoring the plan have to make any catch-up contribution as Roth (SECURE 2.0 §603). The wage threshold is set annually by IRS notice (Notice 2025-67 set 2026 at $150,000). Below the wage threshold, the employee chooses pre-tax or Roth. Plans that do not currently offer Roth have to add the option or stop accepting catch-ups from high earners.
When are RMDs required?
For pre-tax 401(k) balances, required minimum distributions start at age 73 for anyone who reached 72 in 2023 or later. The age shifts to 75 starting in 2033 (SECURE 2.0 §107). Roth 401(k) money inside a designated Roth account is exempt for the original owner under SECURE 2.0 §325 (effective 2024). The IRS RMD FAQ has the current rules.
Can the plan offer participant loans and hardship withdrawals?
Yes, if the plan document allows it. Loans are capped at 50% of the vested balance or $50,000, whichever is less, repaid over up to 5 years (longer for a primary-residence loan). Hardship withdrawals are allowed for IRS-defined safe-harbor reasons (medical, education, primary residence, funeral, casualty loss, eviction). Whether your plan offers either depends on how the plan document is set up.
What happens when an employee leaves the company?
When an employee leaves, their vested balance stays in the plan unless they elect a distribution or rollover. Plans can force out small balances. Under SECURE 2.0, the involuntary cash-out threshold rose from $5,000 to $7,000 in 2024. Cash distributions are subject to 20% mandatory federal withholding and reported on Form 1099-R for the year paid.
What investments can the plan hold?
If you want a self-directed 401(k) for an owner-only business, see our Solo 401(k) page. For a multi-employee plan, the investment menu is set in the plan document, typically a curated set of mutual funds or collective investment trusts. We can structure plans that allow self-directed brokerage windows for participants who want broader access. Prohibited transaction rules apply the same way they do to a self-directed IRA.
How is plan administration priced?
Pricing depends on plan design (Safe Harbor, traditional, profit-sharing, or a combination) and headcount. Talk to a specialist for a quote.
Talk it through
Not sure which plan design fits your team?
Fifteen minutes with a specialist gets you a recommendation and a quote.
