What is a 401(k) and how does it actually work?
Retirement
A 401(k) is an employer-sponsored retirement account that lets you contribute pre-tax or Roth dollars from your paycheck, often with an employer match. The 2026 employee contribution limit is $24,500, plus catch-up amounts at 50+.
The mechanics in plain English
Money is withheld from your paycheck before (traditional) or after (Roth) federal income tax, deposited into an investment account in your name, and grows tax-deferred. You choose the funds, the employer chooses the menu of options.
What employer match really means
A typical 'dollar-for-dollar up to 5%' match is an instant 100% return on the matched portion. Skipping the match is, mathematically, the most expensive thing most employees do.
Vesting, fees, and the parts nobody tells you
Your contributions are always yours. The match may vest over 3 to 6 years. Underneath the funds are expense ratios that quietly compound, sometimes a 0.5% difference can cost six figures over a career.
What people often get wrong
- Contributing only enough to feel responsible, not enough to capture the full match
- Defaulting into a target-date fund without checking its expense ratio
- Forgetting about old 401(k)s when you change jobs
What to think about next
- Confirm exactly what your employer matches and contribute at least up to that.
- Pull up the fund expense ratios in your plan and identify anything above 0.5%.
- List every 401(k) you've ever had and decide whether to consolidate.
When to consider working with a CFP®
Working with a CFP® can help when these decisions feel intertwined, taxes, investments, cash flow, and life goals tend to move together, and a planning relationship can offer structure, prioritization, and accountability over time.
Frequently Asked Questions
Pre-tax or Roth?
Pre-tax is generally better when you expect lower taxes in retirement. Roth makes sense when you're early career, in a low bracket, or expect higher rates later. Many people benefit from a mix.
What's the 2026 limit?
$24,500 employee contribution. $8,000 standard catch-up at age 50+. New 'super catch-up' of $11,250 for ages 60-63 (SECURE 2.0).
Talk to a CFP® who works with high earners.
Connect with a CFP® to help you navigate this decision and build a comprehensive financial strategy.
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