New data from Fidelity reveals that the average 401(k) balances for Americans in their 30s and 40s have notably increased, fueled by a strong stock market. As of mid-2026, those in their 30s hold an average of $75,200 in their accounts, while individuals in their 40s have amassed around $156,800. Workers are also saving a historically high share of their income, with contributions averaging 14.4% of paychecks, including employer matches, nearing Fidelity's recommended 15% savings rate.

Despite solid 401(k) balances, financial experts caution that these figures represent only a portion of retirement readiness. Fidelity suggests aiming for retirement savings equal to one’s annual income by age 30 and roughly three times income by age 40, but this includes all assets, not just 401(k) funds. Certified financial planners like Kevan Melchiorre and Adam Vega emphasize evaluating overall net worth, including home equity and debts, to get a more accurate picture of one’s financial health and progress toward retirement goals.

Fidelity highlights unique advantages of the 401(k), such as higher contribution limits for 2026—up to $24,500 compared to $7,500 for IRAs—and employer matching programs, which encourage savings. However, the outlook isn’t bleak for those behind on savings in their 40s. Experts stress that it’s never too late to ramp up contributions, as starting sooner allows for more compounding growth, but even later starters can catch up by increasing their monthly investments when possible.

Financial advisors recommend steady and increasing contributions over time, particularly as certain expenses like education costs decline during one’s 40s. They urge savers not to be discouraged if they lag behind benchmarks and to focus instead on consistent progress. The overall message is that while current 401(k) balances in the 30s and 40s are growing, comprehensive retirement planning should include multiple accounts and assets to build long-term financial security.