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Retirement Plan Administration FAQs

Retirement plan administration involves much more than processing employee contributions. Employers, accountants, payroll professionals, and plan administrators must understand eligibility, contributions, payroll processes, plan documents, compliance requirements, testing, reporting, and participant communications.

The Retirement Plan Administration FAQs at CPA Training Center provide educational answers to common questions about 401(k) plans, retirement contributions, eligibility, vesting, employer matching, compliance testing, plan administration, payroll, fiduciary responsibilities, and related accounting concepts.

Important: Retirement plan rules are highly regulated and can change. Retirement plan work sits at the intersection of tax, ERISA, and audit, and the penalties for administrative failures are disproportionate to how routine the failures are. This page provides general educational information and should not be considered legal, tax, investment, or retirement-planning advice.

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Common FAQs About Retirement Plan Administration

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What is retirement plan administration

Retirement plan administration is the process of managing the operational, financial, compliance, and reporting requirements associated with an employer-sponsored retirement plan. Administration can include employee eligibility, enrollment, contributions, payroll coordination, vesting, distributions, compliance testing, recordkeeping, reporting, and participant communications.

Who is responsible for administering a retirement plan

Responsibility depends on the plan structure and service arrangements. An employer may handle some administrative responsibilities internally while relying on third-party administrators, recordkeepers, payroll providers, investment providers, accountants, attorneys, or other professionals for specific functions.

Why is retirement plan administration important

Proper administration helps ensure that the plan operates according to its governing documents and applicable requirements. Errors can affect employee benefits, payroll, tax reporting, compliance, and the employer's responsibilities.

What types of retirement plans require administration

Common employer-sponsored retirement plans include:

• 401(k) plans
• 403(b) plans
• Profit-sharing plans
• Defined benefit pension plans
• SIMPLE IRA plans
• SEP plans
• Other qualified retirement arrangements

Administration requirements vary by plan type.

What is a 401(k) plan

A 401(k) is an employer-sponsored retirement plan that generally allows eligible employees to contribute part of their compensation to an individual account under the terms of the plan. Many 401(k) plans also provide employer contributions.

When can an employee participate in a retirement plan

Eligibility depends on the plan document and applicable rules. Plans may establish requirements involving age, service, employment status, and other conditions, subject to applicable legal requirements.

What is an eligibility date

An eligibility date is the date on which an employee becomes eligible to participate in a retirement plan after satisfying the applicable requirements.

What happens if an eligible employee is not enrolled

Failing to properly enroll an eligible employee can create a plan administration issue. Employers and administrators should follow applicable correction procedures when eligibility or enrollment errors occur.

Can part-time employees participate in a 401(k)

Potentially. Eligibility for part-time employees depends on the plan's terms and applicable requirements. Retirement plan rules have specific provisions concerning long-term part-time employees, so administrators shou

What is an employee deferral

An employee deferral is an amount an employee elects to contribute to a retirement plan from compensation, generally through payroll.

What is an employer matching contribution

An employer matching contribution is an employer contribution based on an employee's eligible contributions, usually according to a formula specified in the plan.

What is a profit-sharing contribution

A profit-sharing contribution is an employer contribution made to a retirement plan under a plan's profit-sharing provisions. Despite the name, a company may be able to make a profit-sharing contribution even when it does not distribute profits in the traditional sense, subject to applicable plan rules.

What is a nonelective employer contribution

A nonelective contribution is an employer contribution made on behalf of eligible employees without requiring those employees to make their own contributions.

What is a contribution limit

A contribution limit is a legal or plan-specific restriction on the amount that can be contributed to a retirement plan.

Applicable limits can change from year to year.

Can employees contribute too much to a 401(k)

Yes. Contribution errors can occur when payroll systems or other processes do not properly apply applicable limits.

Excess contributions may require correction under applicable rules.

What does vesting mean

Vesting refers to an employee's ownership of employer contributions made to a retirement plan. Employee contributions are generally fully vested, while employer contributions may be subject to a vesting schedule depending on the plan.

What is a vesting schedule

A vesting schedule determines how an employee's ownership of certain employer contributions increases over time. The applicable schedule depends on the plan and applicable requirements.

Why is vesting important for plan administrators

Accurate vesting records are necessary to determine the amount of an employee's account that belongs to the employee when a distribution or other event occurs.

What is retirement plan compliance testing

Compliance testing involves evaluating whether a retirement plan satisfies applicable legal and regulatory requirements. Certain plans may be subject to nondiscrimination and other tests designed to ensure that plan benefits do not improperly favor highly compensated employees or other groups.

What is ADP testing

ADP testing generally evaluates employee elective deferrals in a 401(k) plan to determine whether contributions for highly compensated employees are appropriately balanced relative to those for non-highly compensated employees.

What is ACP testing

ACP testing generally evaluates certain employer matching and employee contributions to determine whether the plan satisfies applicable nondiscrimination requirements.

What is nondiscrimination testing

Nondiscrimination testing is designed to evaluate whether a retirement plan provides benefits or contributions in a manner that satisfies applicable rules for different categories of employees.

What happens if a retirement plan fails a compliance test

The correction depends on the type of test, the plan, the circumstances, and applicable rules. Possible corrective actions can include refunds, additional employer contributions, or other permitted corrections.

What is a retirement plan recordkeeper

A recordkeeper maintains participant account information and other plan-related records. Recordkeepers may track contributions, balances, investment elections, distributions, and other participant information.

What is Form 5500

Form 5500 is part of the federal reporting framework for employee benefit plans.

Certain retirement plans are required to file Form 5500 or a related filing, depending on the plan and applicable requirements.

Who is responsible for filing Form 5500

Responsibility depends on the plan and its service arrangements. The plan administrator generally has important responsibilities regarding required filings, even when a third-party service provider assists with preparation.

What happens if a Form 5500 is filed late

A late filing can result in penalties or other compliance consequences. Plan administrators should understand filing deadlines and available correction programs when applicable.

Do retirement plans need to be audited

Certain retirement plans may be subject to annual audit requirements based on applicable rules, including participant-count and plan-status considerations. The requirements can be complex, so plan sponsors should consult the current requirements applicable to their plan.

What does a retirement plan auditor examine

A retirement plan audit may involve examining financial information, participant data, contributions, distributions, investments, internal controls, and other plan records.

What is a limited-scope retirement plan audit

A limited-scope audit is a type of retirement plan audit that may rely on certifications from certain regulated financial institutions concerning specified information, subject to applicable requirements.

Why are retirement plan internal controls important

Strong internal controls can help prevent and detect errors involving eligibility, payroll contributions, di

Who is a plan fiduciary

Anyone with discretionary authority over plan management or assets, or who provides investment advice for a fee - determined by function, not by title. Naming someone in the plan document makes them a fiduciary; so does simply acting like one. Accountants should be clear about which side of that line their engagement sits on, because fiduciary status carries personal liability.

What are the core fiduciary duties under ERISA

Acting solely in the interest of participants and beneficiaries, acting prudently, diversifying investments to minimize the risk of large losses, following the plan documents to the extent they are consistent with ERISA, and paying only reasonable plan expenses. The prudence standard is about process: documented, informed decision-making is the defense.

What are the 2026 contribution limits

The elective deferral limit for 401(k), 403(b), and most 457 plans is $24,500, with a catch-up contribution of $8,000 for participants age 50 and over. Participants aged 60 through 63 have a higher catch-up of $11,250. The IRA contribution limit is $7,500. These limits are indexed and change most years, so never carry a prior-year figure forward.

Which employees must make catch-up contributions as Roth

Participants whose prior-year wages from the sponsoring employer exceeded $150,000 must make catch-up contributions on a Roth basis. This is a SECURE 2.0 requirement, and it is a payroll problem as much as a plan problem: it requires the plan to permit Roth contributions and the payroll system to identify affected participants using the prior year's wages.

When does a retirement plan need an audit

Generally when the plan is a large plan - the long-standing threshold is 100 participants, softened by the 80/120 rule that lets a plan continue filing as it did the prior year while participant counts sit between 80 and 120. Since the 2023 plan year, the count for defined contribution plans is based on participants with account balances rather than all eligible participants, which moved a meaningful number of plans out of audit requirement.

What is Form 5500, and when is it due

It is the annual report filed for most ERISA plans, covering financial condition, investments, and operations, filed electronically through EFAST2. The general due date is the last day of the seventh month after the plan year ends, with an extension available on Form 5558. Late filing penalties accrue daily and can be substantial, which is why the Delinquent Filer Voluntary Compliance Program exists.

What are the most common plan operational failures

Using the wrong definition of compensation, failing to implement deferral elections or auto-enrollment correctly, late remittance of employee deferrals, missing eligible employees, and failing to apply the plan's vesting schedule accurately. Nearly all of them originate in payroll rather than in the plan document.

How quickly must employee deferrals be deposited

As soon as they can reasonably be segregated from the employer's general assets. There is a safe harbor for small plans of the seventh business day following withholding; larger plans have no such bright line and are held to what is actually achievable for that employer. Late deposits are a prohibited transaction and are reported on Form 5500 - they are among the most visible failures a plan can have.

What programs exist to correct plan errors

The IRS Employee Plans Compliance Resolution System provides self-correction, voluntary correction with a filing, and audit closing agreements, depending on the nature and significance of the failure. The Department of Labor's Voluntary Fiduciary Correction Program addresses fiduciary breaches such as late deposits. Correcting proactively is nearly always cheaper than correcting after examination.

What did SECURE 2.0 change that plan sponsors still get wrong

The provisions that most often catch sponsors are the automatic enrollment requirement applying to newer plans, the changes to the required minimum distribution age, expanded eligibility for long-term part-time employees, and the Roth catch-up rule above. The pattern is that most of these require payroll and recordkeeper coordination, and the sponsor is the one accountable when that coordination does not happen.

Should an accounting firm that audits a plan also do the plan's bookkeeping

Independence rules restrict what a firm may do for an audit client, and plan audits are no exception. A firm that maintains the plan's records or performs management functions will generally impair its independence to audit that plan. Resolve the independence question before accepting the engagement, not after.

When can an employee take money from a retirement plan

Distribution rules depend on the plan type, plan terms, the employee's circumstances, and applicable tax law. Certain events may permit distributions, including retirement, termination of employment, disability, or other qualifying events.

What is a hardship distribution

A hardship distribution is a distribution permitted by certain retirement plans when an employee experiences an immediate and heavy financial need and meets applicable requirements.

What is a required minimum distribution

A required minimum distribution, or RMD, is a minimum amount that certain retirement account owners may be required to withdraw at applicable ages or under other circumstances. RMD rules can differ depending on the type of account and the individual's circumstances.

What happens to a retirement account when an employee leaves

The employee may have several options depending on the plan and applicable rules, such as leaving the money in the plan, taking a distribution, or rolling eligible amounts into another retirement arrangement.

What is a rollover

A rollover generally involves moving eligible retirement assets from one retirement arrangement to another while following applicable tax and procedural requirements.

Why do accountants need to understand retirement plans

Accountants may encounter retirement plans through payroll, financial reporting, employee benefits, tax compliance, audits, and employer advisory services. Understanding basic retirement plan administration can help accountants identify errors and communicate effectively with plan administrators and other specialists.

Can CPAs specialize in retirement plan administration

Yes. CPAs can develop expertise in retirement plan accounting, compliance, auditing, tax considerations, employee benefits, or advisory services. Doing so is a great way to satisfy customer needs – and to grow your business!