What it is
A 401(k) is an employer-sponsored retirement plan that can accept employee salary deferrals and employer contributions. A plan may offer traditional pre-tax and designated Roth contributions. Its investment menu and administration are set by the plan.
Why it exists
It connects payroll saving with a retirement account and may include an employer match. Employee deferrals, employer money, investment earnings and vesting are distinct parts of the record.
When it may help
It may help a household understand contributions already being made, match conditions, beneficiary designations and choices after a job change. The plan’s own summary and statements are the starting point.
When it may not fit
It may not provide the same flexibility as a personal brokerage account. Someone who may need cash soon should understand distribution and loan restrictions rather than viewing the statement balance as available spending money.
Tradeoffs and access
Investments and fees affect value. Employer contributions can have vesting conditions; employee deferrals are vested. Loans, hardship withdrawals, rollovers and distributions depend on law and plan terms. Leaving employment can change loan or distribution choices. Never assume every employer offers the same features.
Tax considerations
Pre-tax and Roth contributions have different current and later tax treatment. Annual deferral, combined contribution and catch-up rules are distinct. Beginning in 2026, certain higher-paid participants’ catch-up contributions must be Roth under applicable rules; confirm with the administrator instead of applying a remembered threshold to every worker.
Common mistakes
Avoid overlooking vesting, counting employer matches as your own deferral, taking a distribution when a direct rollover was intended, or assuming a beneficiary recorded in Planstead changes the employer’s form.
Fictional example
Fictional Sam changes jobs with a vested balance and an outstanding plan loan. Before moving the account, Sam requests the administrator’s options and deadlines and compares costs and protections. Planstead does not recommend a rollover destination.
Questions to ask
What match and vesting terms apply? Which fees are charged? Are there pre-tax, Roth and after-tax sources? What happens to a loan on departure? Has the plan accepted the current beneficiary designation?
What to record in Planstead
Record the employer plan, administrator, owner, approximate balance/date and beneficiary status. Keep an old employer’s plan distinguishable from the current one; do not count a rollover twice.
Next step
Request the current summary plan description and latest statement. Resolve a specific match, vesting, loan or rollover question with the plan before making changes.
Sources
Primary sources reviewed 2026-09-14. A source describes its own rules; the fictional examples illustrate questions, not a recommendation.