If you’re asking why your 401(k) went down, the balance almost always fell for one of a few reasons: the investments inside the account lost market value, fees were deducted, unvested employer contributions were forfeited when you left a job, or money left the account through a loan or withdrawal. A 401(k) holds mutual funds and other securities that move with the market every business day, so short-term declines are a normal part of how the account works, not a sign that something has gone wrong.
Which cause applies to you determines whether you need to do anything at all. Here’s how to tell them apart.
The Market Dropped
Most 401(k) contributions go into mutual funds that hold stocks, bonds, or a mix of both. When the stock market falls, the value of those underlying shares falls, and your balance falls with it. What you see on the statement is an unrealized loss. The number on paper is lower, but you haven’t actually locked in the loss unless you sell.
Broad drops in indices like the S&P 500 show up almost immediately across most participant accounts because so many 401(k) funds hold the same large companies. The trigger might be inflation news, a rate decision, geopolitical events, or trouble in a single industry that ripples through a fund. Prices reset every trading day. A five or ten percent dip during a volatile month is standard market participation.
Target-Date Funds Rebalancing
If you’re in a target-date fund, the fund automatically shifts its stock and bond mix as you approach retirement.1U.S. Department of Labor. Target Date Retirement Funds – Tips for ERISA Plan Fiduciaries Early on it leans toward stocks; closer to the target date it moves into bonds. That rebalancing can drag on returns in either direction. If stocks are surging, the fund may be selling some of those winners and buying bonds. If bonds are falling because interest rates are rising, the fund can lose value even while stocks are steady. The fund is doing what it was designed to do.
Fees Came Out of Your Account
Running a retirement plan costs money, and the money comes from your balance. The most common charge is the expense ratio, a percentage of your invested assets that pays fund managers and operating costs. A fund charging 0.50 percent costs $5 per year for every $1,000 invested. Index funds tracking a benchmark tend to run around 0.05 percent; actively managed funds average closer to 0.60 percent.
On top of investment fees, your plan may charge administrative fees for recordkeeping, legal compliance, and customer service. Sometimes it’s a flat quarterly charge, sometimes a small percentage of the balance. When those deductions hit during a flat or slightly negative month, the balance can go down entirely because of fees.
Some mutual funds also carry a 12b-1 fee that pays for marketing and distribution. It comes out of fund assets before your return is calculated, so you never see a separate line item; your return is simply lower than it otherwise would have been.2U.S. Department of Labor. A Look At 401(k) Plan Fees Your plan is required to send you fee disclosures at least once a year listing administrative charges and the total annual operating expenses of each investment option.3eCFR. 29 CFR 2550.404a-5 – Fiduciary Requirements for Disclosure in Participant-Directed Individual Account Plans It’s worth pulling last year’s disclosure and comparing the numbers.
You Left a Job Before Fully Vesting
One of the most common surprise drops happens right after leaving an employer. Your own paycheck contributions are always 100 percent yours. Employer matching contributions, though, usually follow a vesting schedule — a timeline that determines how much of the match you actually own. Anything not yet vested goes back to the employer when you leave, and it disappears from the balance.
Under a cliff schedule, you own none of the employer’s contributions until a set milestone, commonly three years of service, at which point you become 100 percent vested at once.4Internal Revenue Service. Retirement Topics – Vesting Leave at two years and eleven months and you forfeit the entire employer match.
Under a graded schedule, ownership builds year by year. A common version:4Internal Revenue Service. Retirement Topics – Vesting
- Year 1: 0 percent vested
- Year 2: 20 percent vested
- Year 3: 40 percent vested
- Year 4: 60 percent vested
- Year 5: 80 percent vested
- Year 6: 100 percent vested
A participant with $10,000 in employer contributions who leaves after two years keeps only $2,000. The other $8,000 is forfeited. Some employers use a safe harbor 401(k), where employer contributions are fully vested from day one; if that’s your plan, you can’t lose the match by leaving early. Your summary plan description or annual notice will tell you which schedule applies.
Money Left the Account
Any time cash leaves the 401(k), whether temporarily or permanently, the reported balance drops right away.
You Took a Loan
When you borrow from a 401(k), the loan amount is pulled out of your investments and moved into a separate loan account. You can borrow up to 50 percent of your vested balance or $50,000, whichever is less, and you generally repay within five years with at least quarterly payments.5Internal Revenue Service. Retirement Topics – Plan Loans Your statement typically shows only the invested assets that remain, so the balance can look like it plummeted even though you owe the money to yourself. The real cost is the investment growth you miss while those dollars are out of the market.
If you leave the job with an outstanding loan balance, the unpaid amount is treated as a distribution. You can avoid the tax hit by rolling the outstanding balance into an IRA or another eligible plan by your tax filing deadline (including extensions) for the year the loan is treated as distributed.5Internal Revenue Service. Retirement Topics – Plan Loans Miss that deadline and you owe income taxes, plus a 10 percent penalty if you’re under 59½.
You Took an Early Withdrawal
Taking money out before age 59½ generally triggers a 10 percent additional tax on top of regular income taxes.6Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts A $10,000 withdrawal can shrink to $7,000 or less after taxes and penalties are withheld, and the balance reflects the exit immediately.
There are exceptions to the 10 percent penalty, including leaving your employer during or after the year you turn 55, total and permanent disability, substantially equal periodic payments, a qualified domestic relations order, and specific hardship categories added in recent years for emergency expenses, domestic abuse victims, and federally declared disasters.7Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Regular income taxes still apply; the exception only waives the extra penalty.
Hardship Withdrawal
Some plans allow hardship withdrawals for an immediate and heavy financial need, including unreimbursed medical expenses, buying a primary residence, tuition and room and board, payments to prevent eviction or foreclosure, funeral expenses, and certain home repair costs.8Internal Revenue Service. Retirement Topics – Hardship Distributions Unlike a loan, a hardship withdrawal can’t be repaid into the plan. The money and any future growth on it are gone.
The 20 Percent That Got Withheld
When a distribution is paid directly to you rather than rolled to another retirement account, the plan must withhold 20 percent for federal income taxes, even if you plan to roll it over later.9Internal Revenue Service. 401(k) Resource Guide – Plan Participants – General Distribution Rules A $50,000 distribution puts $40,000 in your hands. To roll the full amount and defer all taxes, you have to come up with the missing $10,000 from somewhere else. A direct rollover, where the plan sends the money straight to your new IRA or 401(k), avoids the withholding entirely.
Interest Rates Rose and Bonds Fell
Bonds aren’t immune to losses. Bond prices move opposite interest rates: when the Federal Reserve raises rates, older bonds paying lower interest become less attractive, and their market price drops. If your 401(k) holds a bond fund, that drop shows up on the statement, even though you may have chosen bonds specifically because you wanted something conservative.
During a period of rapidly rising rates, a bond-heavy fund can lose several percentage points quickly. Your account can decline even while the stock market is flat or rising. When rates fall, the effect reverses and bond prices rise. A “safe” allocation can still produce negative returns in certain rate environments, and this is often the missing piece when a cautious investor is confused by a drop.
The Plan Was in a Blackout Period
If your employer switches 401(k) providers or makes significant plan changes, there may be a blackout period during which you can’t trade, take loans, or request distributions. Federal rules define a blackout as any suspension of those rights lasting more than three consecutive business days, and the plan administrator generally has to notify participants at least 30 days in advance.10eCFR. 29 CFR 2520.101-3 – Notice of Blackout Periods Under Individual Account Plans
During the transition, investments are typically liquidated and reinvested with the new provider. Your money can sit in cash or a temporary holding fund for days or weeks, missing any market movement in that window. Reconciliation between the old and new recordkeeper can also cause temporary discrepancies in the stated balance. If a drop appears right around a plan change, check with your benefits department before assuming money was lost. The numbers often correct once the transfer settles.
What to Do About It
A market-driven decline only becomes a real loss if you sell. Continuing regular contributions during a downturn works in your favor: when prices are lower, each paycheck buys more shares of the same funds, which lowers your average cost per share over time.
If the balance dropped and the broader market didn’t, the cause is somewhere else. Three quick checks:
- Pull your most recent fee disclosure and look for administrative charges or expense ratios you didn’t notice before.
- Confirm your vesting status with the plan administrator, especially if you recently changed jobs.
- Check whether a loan repayment, distribution, or plan transition happened in the same period as the drop.
Once you know which factor caused the decline, you know whether to act on it or leave it alone.