On a 401(k) statement, the “change in market value” is the dollar amount your investments gained or lost from price movement alone during the reporting period. It excludes your paycheck contributions, your employer’s match, administrative fees, and any loan activity, so what remains is the raw performance of the holdings you already had in the account. Federal law requires plan administrators to send this statement at least once a calendar quarter for plans where participants direct their own investments, which is why most people encounter the figure four times a year.1Office of the Law Revision Counsel. 29 U.S. Code 1025 – Reporting of Participants Benefit Rights
What the Line Includes and What It Leaves Out
Your statement breaks account activity into separate line items so you can see exactly where each dollar came from. Say your balance grew by $1,200 over a quarter. The statement might show $500 from your contributions, $250 from your employer’s match, and $450 from the change in market value. Only that last piece reflects what the market did to the money already invested.
This split matters because a rising balance can hide poor investment performance. Someone contributing $800 a month can see a growing account even while their funds are losing value. A strong quarter can also make a modest savings rate look better than it is. Isolating market movement gives you an honest read on your investment choices rather than a blended figure that obscures what’s actually happening underneath.
Administrative and recordkeeping fees show up on their own line as well. Federal rules require your plan to disclose the dollar amount of administrative and individual fees charged to your account each quarter.2U.S. Department of Labor, Employee Benefits Security Administration (EBSA). Reporting and Disclosure Guide for Employee Benefit Plans Those fees reduce your balance but sit outside the change in market value.
What Actually Moves the Number
Most 401(k) plans invest through mutual funds or target-date funds, which hold baskets of stocks, bonds, or both. When the companies inside those funds post strong earnings, or investor demand pushes stock prices higher, the fund’s share price rises and your change in market value is positive. When the reverse happens, the number turns negative.
Broad economic forces drive most of the variation. Interest rate changes from the Federal Reserve move bond prices directly and stock valuations indirectly. Employment data, inflation reports, and corporate earnings all work their way into fund prices. You don’t have to track every release to understand that these outside forces are what the number on your statement is responding to.
Sector exposure matters too. If your plan includes a fund concentrated in technology stocks and that sector has a rough quarter, you’ll see a bigger negative swing than someone whose money is spread across many sectors. How you allocate among the fund options your plan offers determines your personal exposure to any single market event.
Fund Expenses Are Already Baked In
The expense ratio inside each mutual fund quietly reduces your change in market value before the number ever reaches you. A fund with a 0.50% expense ratio deducts that cost from the fund’s assets daily, which lowers the net asset value per share. So if a fund’s underlying holdings gained 8% over a year and the expense ratio was 0.50%, the price change you actually see is closer to 7.5%.
These internal fund costs are separate from the administrative fees your plan discloses as a line item. All-in plan costs vary significantly based on the size of your employer’s plan. Large plans with billions in assets often run well under 0.50%, while small plans with less than a million in assets can run above 1%. If your change in market value consistently trails the benchmark index your fund is supposed to track, high internal expenses are the most common cause. Your plan’s fee disclosure document, which the administrator must provide annually, lists the expense ratio for every fund option you can hold.
Why the Gain or Loss Is “Unrealized”
The change in market value reflects what your holdings are worth on the last day of the statement period, not what you’ve actually collected. Until you sell shares, the gain or loss is on paper. Inside a 401(k), that paper movement has no immediate tax consequence. Federal tax law treats amounts in a qualifying trust as taxable only when distributed, so the IRS is indifferent to whether your funds rose 20% or fell 15% in a given quarter, as long as the money stays in the plan.3Office of the Law Revision Counsel. 26 U.S. Code 402 – Taxability of Beneficiary of Employees Trust
Taxes apply when money comes out. Distributions from a traditional 401(k) are taxed as ordinary income in the year you receive them. If you withdraw before age 59½, you’ll generally owe an additional 10% early withdrawal tax on top, with some exceptions such as separation from service after age 55 or qualifying disability.4Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts Rebalancing inside the plan, where you sell one fund and buy another, doesn’t trigger taxes either, because the money never leaves the 401(k). The practical result: a negative change in market value isn’t a tax loss you can claim, and a positive one isn’t a tax bill you owe.
Reading a Negative Number Without Overreacting
A negative change in market value means your investments lost value during the period. That happens routinely, especially in short windows. Stock markets have historically produced positive returns over long spans but drop often in any given quarter or year. The urge to act when you see red is strong, and for someone decades from retirement it’s usually counterproductive.
The most common mistake is panic-selling: moving everything into a money market or stable value fund after a downturn, which locks in the loss and then misses the recovery. The second is ignoring the statement entirely, because a negative number that repeats across several quarters can point to a genuine problem with your fund selection rather than ordinary market volatility. If one fund keeps dragging while the rest of your portfolio recovers, it’s worth a closer look.
For participants within a few years of retirement, persistent losses carry more weight because there’s less time to recover. Target-date funds are built for this situation and shift gradually toward bonds and lower-volatility holdings as the target year approaches. If you’re managing your own allocation and nearing retirement, a string of negative quarters is a reasonable prompt to review whether your mix still matches your timeline.
How a 401(k) Loan Changes the Picture
If you borrow from your 401(k), the loan balance is pulled out of your invested assets. A $200,000 account with a $20,000 loan has only $180,000 working in the market. The loan itself doesn’t show up in the change in market value; it appears as a separate line item, and repayments come back in the way contributions do.
The part people miss is what the borrowed money isn’t doing. While that $20,000 sits as a loan, it earns a fixed interest rate paid back to your own account rather than participating in whatever the market delivers. If your funds returned 10% during that period, the borrowed amount missed the gain entirely, and your change in market value will be smaller in dollar terms because it’s calculated on a smaller invested base.
Vested Balance vs. Total Balance
Your statement may show two balance figures that look similar: the total account balance and the vested balance. The total includes everything, employer contributions included, even portions you don’t yet fully own. The vested balance is the piece that’s actually yours if you left the company today.
Your own paycheck contributions are always 100% vested immediately.5Internal Revenue Service. Retirement Topics – Vesting Employer matches often follow a vesting schedule. A common structure vests you at 20% per year of service, so the full match belongs to you after five years. Leave before that and the unvested portion goes back to the employer.
The change in market value applies to the total account balance, not just the vested portion. Some of the gains you’re seeing may belong to shares you’d forfeit by leaving early. If you’re gauging your real retirement savings and you’re not fully vested, look at the vested balance for the number you can count on.
When the Statement Looks Wrong
Statement errors are uncommon but not impossible. The usual issues are a contribution that doesn’t appear, an employer match calculated incorrectly, or a fund transfer posted to the wrong account. These won’t register as a market value problem directly, but they distort your overall balance in ways that can make the change in market value look off.
Start by comparing your pay stubs against the contributions listed on the statement. If they don’t match, contact your plan administrator first, since most discrepancies are clerical and resolved quickly. If you can’t get a satisfactory answer, the Department of Labor’s Employee Benefits Security Administration has benefits advisors who can help. You can reach them at 1-866-444-3272 or through the agency’s online portal.6U.S. Department of Labor. Ask EBSA