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Financial mistakes tend to fall into two categories: Small missteps and major crises. Miss a credit card payment and get hit with a late fee? Misstep. Lock in major losses during a market crash? Crisis.
Retirement is different. Decades-long timelines turn routine decisions into make-or-break moments, and the consequences are not always clear. Common 401(k) and IRA mistakes can be a gateway to compounding losses. The most dangerous of these mistakes is deceptively simple.
While the retirement industry has made strides in getting people to save, we are failing them on the most critical next step: Putting that money to work.
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The biggest threat to the American nest egg isn’t a market crash — it’s a parking lot.
When cash becomes a six-figure mistake
Consider two identical savers who each roll over $50,000 into an IRA at age 35:
- Saver A left their funds in cash (earning 2%), ending up with over $90,000
- Saver B invested in a diversified portfolio (earning 7%), ending up with roughly $400,000 by retirement
After 30 years of compounding, cash costs $300k. This is a steep penalty to pay, especially when you consider that the Employee Benefit Research Institute (EBRI) estimates the average IRA balance is just $114,000.
The risks of job mobility
Most Americans are forced to make complex rollover decisions repeatedly. Each job transition is a new opportunity to tick the wrong box and end up with retirement assets that are working against you rather than for you.
But in some cases, Americans are moved into cash without ticking any box at all.
The most recent EBRI data on the topic confirms that nearly a quarter (24%) of IRAs are “overallocated” in cash, or less than 10% invested in equities. The report suggests many of these accounts may represent the silently growing category of Safe Harbor IRAs.
Each year, employers routinely shift left-behind 401(k)s into cash-like accounts called Safe Harbor IRAs.
Recent industry research found that roughly 2 million accounts are transferred each year. Although these accounts are meant to be temporary, 75% remain in Safe Harbors for at least three years. Worse, the average account holder is in their early to mid-40s and decades from retirement.
The cost of confusion
The U.S. used to guarantee retirement through pensions, much like other countries continue to do today. But while individuals now bear primary responsibility for their retirement outcomes, the path is still far from user-friendly.
Not only is the system opaque, but all of us will need to navigate it — regardless of background, interest and aptitude for finance. Everyday savers shouldn’t need the literacy of a fund manager just to guarantee a simple path toward a happy retirement.
As Americans continue to change jobs frequently, the number of accounts transferred to cash may continue to rise. By 2030, there will be more than $43 billion stuck in Safe Harbor IRAs alone.
Cash-heavy retirement accounts held by people nowhere near retirement age reflect confusion, not preference. Until we have a system that favors simplicity, taking control of the pieces can help:
- Audit your accounts. Log in to every old 401(k) or IRA and check your “asset allocation.” If it says “money market” or “cash,” you are losing ground to inflation every single day.
- Simplify and consolidate. Multiple small accounts lead to oversight gaps. Moving your funds into a single IRA or 401(k) can make things easier to track and manage.
- Choose a “set and forget” strategy. Use target-date funds. These automatically rebalance your investments based on your age, ensuring you stay invested for growth while gradually adjusting risk over time.
When what’s “safe” can slash your nest egg by three quarters, it’s worth taking a second look at every box you tick.

