For a 25-year-old, I’d think about this in two separate decisions: how much to contribute, and what to invest it in.
1. Contribution: get the full match first
If the employer matches contributions, contribute at least enough to receive the full employer match. That's usually the first priority because you're getting additional compensation from your employer.
After that, contributing more than the match can make sense, particularly at 25 because the money has potentially decades to compound.
A practical framework is:
- Contribute enough to get 100% of the employer match.
- Keep an adequate emergency fund and pay down high-interest debt.
- If finances allow, gradually increase the 401(k) contribution beyond the match.
- Consider other tax-advantaged accounts, such as an IRA, depending on your circumstances.
- Eventually work toward a total retirement savings rate that fits your income and goals.
For 2026, the employee 401(k) contribution limit is $24,500, although there's no reason a 25-year-old needs to aim for that immediately.
For example, if your employer matches 50% of the first 6% you contribute, contributing 6% gets the full match. Increasing that to 8%, 10%, or 15% means you're saving more, but the extra 2–9% doesn't receive that particular match.
2. Investments: look for these first
Without seeing your plan's fund menu, I wouldn't pick a specific fund by name. But at age 25, the two things I'd look for are:
Option A: A low-cost target-date fund
A target-date fund around your expected retirement year can be an excellent simple choice. For someone who's 25 today, that might mean something roughly in the 2065–2075 range, depending on when they expect to retire.
Target-date funds automatically diversify among stocks and bonds and gradually become more conservative as retirement approaches.
Check the expense ratio, though. Two target-date funds with the same target year can have meaningfully different fees and investment strategies.
Option B: Low-cost broad-market index funds
If the plan has inexpensive index funds, a simple portfolio might use:
- U.S. total stock-market index
- International stock-market index
- A smaller allocation to a bond index, depending on risk tolerance and overall financial situation
At 25, having a substantial stock allocation is common because the investment horizon is long, but stocks can fall substantially and remain volatile for years.
The Department of Labor notes that passively managed index funds generally have lower management fees than actively managed funds, although cost shouldn't be the only factor considered.
A simple example
Suppose the plan offers:
- Target Retirement 2070 — 0.12% expense ratio
- S&P 500 index — 0.03%
- Total international index — 0.08%
- Bond index — 0.04%
- Actively managed growth fund — 0.85%
A person who wants simplicity might put 100% into the low-cost 2070 target-date fund.
Someone who wants to manage their own allocation might instead combine the broad stock and bond index funds.
The important point is that you don't need 8–10 funds to be diversified. A single well-designed target-date fund can already contain hundreds or thousands of underlying securities.
And fees matter over decades: the Department of Labor illustrates how even a 1-percentage-point difference in annual fees can substantially affect long-term accumulation.
If you give me the employer's match formula and the list of funds available in the 401(k) (fund names + expense ratios), I can walk through the choices and explain what each one actually owns and how they differ.