
401(k) glossary
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Plan types
Qualified plan
Short definition
A qualified plan is a retirement plan that meets the requirements of Internal Revenue Code section 401(a), which earns tax benefits for the employer, the employees and the plan’s trust. A 401(k) is a qualified plan.
What a qualified plan is
To be qualified, a plan must have a written document, be run for the exclusive benefit of participants, and meet rules on coverage, nondiscrimination, contribution limits, vesting and distributions. In return the employer deducts its contributions, employees are not taxed until they take money out, and the trust’s earnings are tax-exempt.
Why it matters to employers
“Qualified plan” is the phrase state retirement mandates use. An employer that sponsors one is generally exempt from the state auto-IRA program, and state laws usually extend the exemption to 403(b), SEP and SIMPLE IRA plans as well. A plan that breaks the rules can lose its qualified status, which would make contributions taxable. The IRS correction program, EPCRS, exists so that mistakes can be fixed before that happens.
Example
A California employer with a 401(k) receives a CalSavers notice. It reports to CalSavers that it sponsors a qualified plan and is recorded as exempt.
Common mistakes
Assuming a payroll deduction IRA, or an employee’s own IRA, counts as the employer’s qualified plan.
Running the plan differently from what the plan document says.
Using “qualified” and “ERISA” as if they meant the same thing. Qualification is a tax rule; ERISA is a labor law, and some qualified plans, such as an owner-only 401(k), are not subject to ERISA’s main requirements.
Sources
Internal Revenue Service: A guide to common qualified plan requirements (https://www.irs.gov/retirement-plans/a-guide-to-common-qualified-plan-requirements), retrieved 2026-11-11 U.S. Code (govinfo.gov): 26 U.S.C. 401: Qualified pension, profit-sharing, and stock bonus plans (https://www.govinfo.gov/content/pkg/USCODE-2023-title26/html/USCODE-2023-title26-subtitleA-chap1-subchapD-partI-subpartA-sec401.htm), retrieved 2026-11-11 CalSavers: Employer registration and exemption (https://employer.calsavers.com/home/help-center/registration.html), retrieved 2026-11-11
General information, not legal or tax advice.

