Cash in a retirement account feels safe. It isn’t taxed yet, it isn’t invested in anything volatile, and it gives you a sense of control. Here’s what it’s actually doing: sitting in a tax-deferred account and growing the IRS’s future share of your money while delivering the lowest possible return on that deferred tax liability. For many retirees, excess cash is one of the most quietly expensive decisions in their portfolio.
How Cash in an IRA Becomes a Hidden Tax Problem
Every dollar in a traditional IRA or 401(k) is pre-tax money. You didn’t pay tax when it went in. You don’t pay tax while it compounds. You pay when it comes out, at ordinary income rates, regardless of whether it was invested in equities, bonds, or a money market fund earning 4%.
That’s the part most people miss. The tax treatment doesn’t change based on what your IRA is invested in. If your IRA holds $100,000 in a money market fund and you eventually withdraw it, the IRS treats every dollar exactly the same as if it had been in a growth fund that tripled. Which means the “safe” cash and the invested dollars generate identical tax liability on withdrawal. The difference is what you earned before the tax bill arrived.
How to Diagnose Whether You’re Holding Too Much Cash in Retirement Accounts
Step 1: Find out what percentage of your IRA or 401(k) is currently in cash or money market funds.
Pull your most recent statement. Add up money market funds, stable value funds, and any position labeled “cash.” Divide by total account value. Anything above 10 to 15 percent in a long-term account is worth examining.
Step 2: Calculate the opportunity cost of that cash position over 10 years.
A $100,000 cash position earning 4% grows to about $148,000 in 10 years. The same $100,000 in a diversified portfolio with a historical long-term return in the range of 7% grows to about $196,000. The gap is roughly $48,000. That gap still gets taxed on withdrawal. But you would have paid tax on $48,000 more of real growth rather than $48,000 less.
Step 3: Model what that cash balance does to your RMDs.
Per the IRS, required minimum distributions begin at age 73. The IRS formula divides your prior year-end account balance by your life expectancy factor. At age 73, that factor is 26.5 per IRS Publication 590-B. A $500,000 IRA generates an RMD of roughly $18,868. A $548,000 IRA — the same balance that compounded modestly for a few additional years — generates an RMD of roughly $20,679. That’s about $1,800 more in taxable income per year, before the account compounds further. The cash didn’t shrink your tax liability. It reduced your return while that liability kept growing.
Step 4: Ask whether the cash is doing a specific job.
Cash in a retirement account is appropriate as a short-term buffer for distributions you plan to take in the next 12 to 18 months. That’s a defined purpose. Cash held indefinitely because “markets are uncertain” is not a strategy. It’s a reflex.
The RMD Amplifier Nobody Talks About
Here’s where the hidden cost compounds in a way that surprises most people.
Keeping a large cash position inside a traditional IRA doesn’t shrink your future RMD obligation. It just slows the growth of the account while the IRS’s claim on every dollar inside it remains unchanged. Every year you hold underperforming assets in a pre-tax account, you’re building a slightly smaller account that still carries the same proportional tax liability.
Add the IRS penalty for missing an RMD: 25% of the amount not withdrawn, per IRS Publication 590-B, reduced to 10% if corrected within two years. If the account has drifted in a way you weren’t monitoring because it felt “safe,” the stakes of a missed distribution are higher than most people realize. Safety doesn’t come from holding cash in a pre-tax account. It comes from understanding what that account is going to cost you in your 70s and managing it before then.
When Cash in Retirement Accounts Actually Makes Sense
Jeff isn’t arguing that retirement accounts should be fully invested in equities at all times. That’s the other mistake. What he’s arguing is that cash inside a pre-tax account should have a job description and an expiration date.
Appropriate uses:
- Holding 12 to 24 months of planned distributions to avoid forced selling in a down market
- Waiting to redeploy after a portfolio rebalance, with a specific reinvestment timeline
- Bridging income between retirement and Social Security or RMD age with a clear drawdown plan
Inappropriate uses: holding cash because you’re nervous about the market, because you’re unsure what else to do with it, or because it feels stable in an uncertain environment. Those are emotions, not strategies. And the cost of that confusion compounds annually inside a tax-deferred account.
What to Do With the Cash You Shouldn’t Be Holding
If you have excess cash sitting in a traditional IRA or 401(k) beyond what the next 18 months of distributions require, the question is straightforward: what should it be invested in, and when does it get redeployed?
That’s a planning question, not a market-timing question. The answer depends on your overall allocation, your income needs over the next 3 to 5 years, your marginal tax rate, and how your account balances interact with Medicare and Social Security income thresholds year by year.
Running that analysis before age 73 matters. After RMDs begin, your flexibility narrows. You can still manage the pace of withdrawals above the minimum, but the floor is set by the IRS formula, not your preferences.
The cash in your retirement account feels safe. The tax bill attached to every dollar of it is locked in. The question is whether you’re earning enough between now and withdrawal to make that deferred liability worthwhile.
Schedule a no-obligation call with Jeff to review what your retirement account cash positions are actually costing you.
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The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn’t guarantee future results. Consult with qualified financial professionals regarding your specific situation.
Securities offered through LPL Financial, Member FINRA/SIPC. Investment advice offered through Great Valley Advisor Group, a registered investment advisor and separate entity from LPL Financial.
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