401(k) Deep Dive
What is a 401(k)?
A 401(k) is a retirement account you get through your employer. The name is boring (it's just a tax code section), but the benefits are not: you get to invest money before paying taxes on it, and many employers will literally give you free money to participate.
Here's how it works: you tell your employer to take a percentage of each paycheck and put it directly into your 401(k). That money gets invested (usually in index funds, target-date funds, or a menu of options you choose). It grows tax-free until you retire. And in many cases, your employer matches some of what you put in — which is the closest thing to free money you'll ever find.
2026 contribution limits
The IRS sets a limit on how much you can put into a 401(k) each year. For 2026, that's $24,500. If you're 50 or older, you get an extra "catch-up" contribution of $7,500, bringing your total to $32,000.
Most people don't hit these limits — and that's okay. The real goal is to contribute enough to get your full employer match (more on that in a second), and ideally work your way up to saving 15% of your income for retirement.
The employer match: free money
This is the most important part. Many employers will match a percentage of what you contribute. A common formula is 50% of your contributions up to 6% of your salary.
“If your employer offers a match and you're not contributing enough to get all of it, you're leaving money on the table. It's a guaranteed 50–100% return on your investment.”
Example: You make $60,000/year. Your employer matches 50% of your contributions up to 6% of your salary. If you contribute $3,600 (6% of $60k), your employer adds $1,800 (50% of $3,600). That's $1,800 of free money. Every year. Just for participating.
There is no investment strategy on earth that beats free money. Always contribute at least enough to get the full match.
Traditional vs Roth 401(k)
Most 401(k) plans offer two flavors: Traditional and Roth. The difference is when you pay taxes.
- •Contributions are pre-tax (lowers your taxable income now)
- •Money grows tax-free
- •You pay taxes when you withdraw in retirement
- •Good if you expect to be in a lower tax bracket later
- •Contributions are after-tax (no immediate tax break)
- •Money grows tax-free
- •Withdrawals in retirement are 100% tax-free
- •Good if you expect to be in a higher tax bracket later
Which should you choose? If you're young and early in your career, Roth is often the better bet — you're likely in a lower tax bracket now than you will be in retirement. If you're older and earning more, Traditional might make sense. But honestly, both are great. The important thing is that you're contributing at all.
Vesting schedules
Your contributions are always 100% yours. But your employer's match might not be — at least not right away.
Many companies use a vesting schedule, which means you have to work there for a certain amount of time before the employer match fully belongs to you. Common schedules:
- •Employer match is yours instantly
- •Best case scenario
- •You vest gradually (e.g., 20% per year over 5 years)
- •Most common
- •You get 0% until year 3, then 100%
- •Less common, but still legal
If you leave your job before you're fully vested, you forfeit the unvested portion of the match. This is worth knowing if you're considering a job change — sometimes it makes sense to wait a few more months to hit full vesting.
What you can invest in
Your 401(k) isn't just a savings account — it's an investment account. Your employer chooses a menu of investment options, and you decide how to allocate your contributions.
The most common options:
- •Automatically adjusts from stocks to bonds as you near retirement
- •Example: "2060 Fund" if you plan to retire around 2060
- •Set it and forget it — great for beginners
- •S&P 500 or Total Stock Market funds
- •Low fees, broad diversification
- •Requires you to manage your own stock/bond allocation
- •Fund managers try to beat the market
- •Higher fees, usually worse returns
- •Generally not recommended
If your plan offers a target-date fund with fees below 0.5%, that's a great default choice. If you want more control, pick a low-cost S&P 500 or Total Stock Market index fund and adjust to bonds as you get older.
When and how much to contribute
Contribution priorities
- At minimum: Contribute enough to get your full employer match
- Next goal: Increase to 10–15% of your income (including the match)
- If you can max it out ($24,500/year): You're in the top tier of retirement savers
- Start small if you need to — even 3% is better than 0%
- Increase by 1% each year until you hit your goal
A good rule of thumb: If you start saving 15% of your income in your 20s and invest it in low-cost index funds, you'll likely be able to retire comfortably without ever having to stress about money. It's not flashy. But it works.
What to do when you leave your job
When you leave a job, you have a few options for your 401(k). Some are smart. One is a disaster.
- •Move the money to a personal IRA (Vanguard, Fidelity, Schwab)
- •More investment options, often lower fees
- •You keep full control
- •Keeps everything in one place
- •Good if your new plan has great options
- •Sometimes okay if the plan is great and fees are low
- •Can get messy if you change jobs a lot
- •You'll pay taxes + 10% penalty if you're under 59½
- •You lose decades of compound growth
- •This is a huge financial mistake
Rolling over to an IRA is usually the best move. It takes about 20 minutes, and it gives you access to better, cheaper investment options than most 401(k) plans offer.
Common mistakes to avoid
Most 401(k) mistakes aren't complicated — they're just easy to overlook. Here are the big ones:
Don't do these things
- Not contributing enough to get the full employer match (you're leaving free money on the table)
- Investing too conservatively when you're young (bonds are boring when you have 30+ years to grow)
- Paying high fees for actively managed funds (index funds beat them 90% of the time and cost way less)
- Cashing out when you change jobs (taxes + penalties + lost growth = financial self-sabotage)
- Never increasing your contribution rate (start at 3%, bump it 1% per year)
The biggest mistake is not starting at all. A 401(k) is one of the most powerful wealth-building tools you have access to. It's not exciting. But it works.
What you need to do
Your next steps
- Check if your employer offers a 401(k) (ask HR or check your benefits portal)
- Find out if there's an employer match and what the formula is
- Enroll and contribute at least enough to get the full match
- Choose a target-date fund or low-cost index fund
- Set it to automatically increase your contribution by 1% each year
- Check it once a year — not once a week
That's it. You don't need to be a finance expert. You don't need to pick stocks. You just need to show up, contribute consistently, and let compound growth do the rest. This is how normal people retire with more than enough.