401(k) Knowledge Base & Blog: Guides for Savers and Planners

These articles explain common 401k topics in plain English—how rules work, what to watch for, and how to use our calculators alongside reading. Nothing here is personalized tax or investment advice; verify details with the IRS and your plan administrator.

Longer guides below include definitions, rule highlights, calculator tie-ins, misconceptions, FAQ, and checklists where helpful—use them together with your Summary Plan Description (SPD) and IRS.gov for anything that affects taxes or distributions. See also our editorial standards and privacy policy.

Browse topics by theme

Articles are grouped below by typical search intent—withdrawals, limits/testing, plan types, and advanced strategies. You can still jump to calculators: full 401k calculator, quick estimator, tiered match, paycheck impact, early withdrawal, and IRS limits overview. The home page Explore This Site lists every in-site URL in one place.

Withdrawals, loans & beneficiary distributions

Penalties, RMDs, loans, divorce (QDRO), and inheritance—money leaving the plan or changing owners.

Contribution limits, testing & eligibility

IRS caps, nondiscrimination testing, vesting, part-time entry, and SECURE-era add-ons.

Plan types, saving strategy & accounts

Roth vs. traditional, benchmarks, employer types (403b/457/solo), IRAs, and small-business plan vocabulary.

Advanced strategies, investments & plan mechanics

Mega backdoor Roth, rollovers, TDFs, fees, NUA stock, auto enrollment, and blackout periods.

Why We Publish Long-Form Knowledge Next to Calculators

YMYL and E-E-A-T

Retirement content is “Your Money Your Life.” We combine dated, transparent articles with tools so users can cross-check assumptions and read primary sources such as IRS.gov.

How articles relate to tools

For example, after reading about match tiers, use the tiered match calculator; after reading about early withdrawals, use the withdrawal estimator for illustration only.