PEP, MEP, 401(k), DB, and More: A Plain-English Guide to Retirement Plan Acronyms for Business Owners
If retirement plans feel like they come with their own alphabet soup, you are not alone. Business owners are routinely introduced to PEPs, MEPs, DB plans, DC plans, and a long list of other abbreviations with little explanation of what they actually mean or why they matter.
This guide is designed to translate the most common retirement plan acronyms into plain English, so you can understand the language before you are asked to make decisions that affect your business, your employees, and your long-term financial strategy.
Core Plan Acronyms
401(k)
Internal Revenue Code Section 401(k)
A defined contribution retirement plan that allows employees to defer a portion of their pay, often with employer matching or profit-sharing contributions. How effective a 401(k) is depends largely on how it is designed.
DB
Defined Benefit
A retirement plan where the benefit at retirement is defined up front. Annual contributions are calculated by an actuary and are generally required. These plans are often used by highly profitable businesses seeking large tax deductions.
DC
Defined Contribution
A category of retirement plans where contributions are defined, but retirement outcomes depend on investment performance.
Multi-Employer Plan Acronyms
PEP
Pooled Employer Plan
A single retirement plan shared by multiple unrelated employers and administered by a Pooled Plan Provider. PEPs can reduce administrative burden but offer limited customization.
MEP
Multiple Employer Plan
A shared retirement plan typically sponsored by employers with a common connection, such as an industry association.
PPP
Pooled Plan Provider
The entity responsible for administering a PEP and taking on certain fiduciary and administrative responsibilities.
Small Employer Plan Acronyms
SEP
Simplified Employee Pension
An employer-funded retirement plan that contributes directly to employee IRAs. SEPs are simple to operate but offer limited flexibility.
SIMPLE
Savings Incentive Match Plan for Employees
A retirement plan for small employers that allows employee deferrals with required employer contributions and lower contribution limits than a 401(k).
Compliance and Testing Acronyms
HCE
Highly Compensated Employee
An employee who meets IRS compensation or ownership thresholds and is subject to special testing rules.
ADP
Actual Deferral Percentage
A nondiscrimination test comparing salary deferrals between highly compensated and non-highly compensated employees.
ACP
Actual Contribution Percentage
A nondiscrimination test applied to employer matching and after-tax contributions.
QDIA
Qualified Default Investment Alternative
The default investment used when participants do not make an active investment election.
Governance and Oversight Acronyms
TPA
Third-Party Administrator
The firm responsible for plan administration, compliance testing, filings, and ongoing operational support.
ERISA
Employee Retirement Income Security Act
The federal law governing most employer-sponsored retirement plans and fiduciary responsibilities.
SPD
Summary Plan Description
A required participant-facing document that explains how the plan works in clear, accessible language.
RMD
Required Minimum Distribution
The minimum amount that must be withdrawn from certain retirement accounts once the required age is reached.
Regulatory and Filing Acronyms
IRS
Internal Revenue Service
The federal agency responsible for tax regulation and retirement plan oversight.
DOL
Department of Labor
The federal agency responsible for enforcing ERISA fiduciary standards.
Form 5500
Annual Retirement Plan Filing
The required annual reporting form for most retirement plans.
Turning Clarity Into Strategy
Understanding retirement plan acronyms will not, by itself, determine which plan is right for your business, but it is an essential first step. Once the language is clear, conversations shift from confusion to strategy.
At Nydia Retirement Solutions, we help business owners move beyond terminology and focus on designing retirement plans that align with cash flow, workforce dynamics, and long-term goals. If you are ready to turn clarity into a plan that actually works for your business, Nydia can help guide the process with confidence and precision.
