A few years back, I sat in the back of an agency retirement seminar while a presenter put up a slide with the average TSP balance on it. A woman two rows ahead of me, maybe 48, went quiet. Afterward I heard her tell a colleague, "I'm at about $70,000. I guess I'm way behind."

She might be. She might not. The slide didn't say, because the number it showed answered a different question than the one she was asking.

Two numbers, two different questions

The average is the total of all balances divided by the number of accounts. The median is the balance of the person in the exact middle if you lined everyone up from smallest to largest. Half have less, half have more.

Those sound like close cousins. In retirement data, they often aren't, because account balances are lopsided. A lot of people have modest balances, and a smaller group has very large ones. The big ones drag the average upward while the median barely notices.

Here is a made-up office of ten employees, with TSP balances in thousands of dollars:

12, 28, 45, 60, 85, 110, 140, 175, 210, 1,135

That last person has contributed for 33 years and is about to retire. Add everything up and you get $2 million. Divide by ten and the average is $200,000. The median, though, sits between the fifth and sixth people: $97,500.

Only two of the ten people have more than the average. Eight of them are "below average" in a group where nothing is wrong. That is the gap in miniature, and it is why the average can make a typical saver feel worse off than they are.

Why TSP balances skew so hard

The TSP is a particularly good example, because the participant population is unusual in several ways.

Tenure varies enormously. A 25-year employee who has been contributing since the late 1990s sits in the same data set as someone hired last spring. Compounding rewards time, so the long-timers pull away fast.

The system includes uniformed services members. Many service members hold small balances, especially early in a career or after a short enlistment, while retired-eligible officers and senior enlisted can hold large ones.

Rollovers inflate some accounts. Someone who transferred a big 401(k) or IRA in from a prior private-sector career can look like a super-saver when much of that money was built elsewhere.

Contribution habits differ. Some people have contributed at the maximum for decades. Others contribute just enough to capture the full agency match. Others have been auto-enrolled at a default rate and never touched it.

Put those together and you get a long tail of big balances on the right side of the chart. The average follows the tail. The median stays with the crowd.

When the average is still useful

I don't want to throw the average out. It earns its place in certain jobs.

If you're a plan administrator or policy analyst, the average tells you how much money the plan holds per participant, which matters for fees, staffing, and investment lineups. It's also useful when you're tracking trends over many years, as long as you compare average to average.

For an individual trying to judge their own progress, though, the median is usually the more honest yardstick. It describes the typical participant, not the typical dollar.

Neither number tells you if you're on track

Here is the part the seminar slide skipped. Both the median and the average blend together people of every age and career stage. Comparing your balance to the all-participant median is a little like comparing your mile time to a field that includes teenagers and marathoners.

Better benchmarks narrow the comparison:

  • Your age band. A median for people in their early 40s tells you far more than one covering everyone.
  • Your years of service. This matters in a system where hiring is uneven and many people arrive mid-career.
  • A multiple of your salary. Commonly cited rules of thumb, such as the guidelines from large retirement-plan providers, suggest roughly one times salary saved by 30, working up to about ten times by the late 60s. They are rough guides, not promises, and they assume you're saving for a full career.

Back to the woman at the seminar. At 48 with $70,000, she'd want to know her salary. If she earns $85,000, she's well under the commonly cited marker for her age. If she was hired at 44 after a career with a private employer and has a separate IRA she didn't mention, the picture changes entirely.

The FERS factor

Most federal employees under FERS don't rely on the TSP alone. They have a basic pension and Social Security too, which is the "three-legged stool" you've probably heard about. A FERS employee with 30 years of service will generally need a smaller TSP balance, relative to salary, than a private-sector worker with only a 401(k) and Social Security.

That means a modest TSP balance isn't automatically a red flag for someone with a strong pension track. It also means that a CSRS or military retiree's situation can look completely different. Raw TSP comparisons across those groups can mislead.

The honest way to check your readiness is to estimate your pension, estimate Social Security, then see how much income the TSP and any IRAs need to fill in. A good first step is the benefit estimators on your agency's HR portal and the statement at ssa.gov.

What to do with this

Start by finding your actual numbers. Log in to tsp.gov, look at your balance and contribution rate, and write them down next to your salary.

Then check the basics:

  1. Are you getting the full match? FERS employees receive an automatic 1% agency contribution, plus matching on the next 4% of pay they contribute. Contributing less than 5% leaves free money on the table.
  2. Is your rate climbing? Raising it by one percentage point each year, or each time you get a raise, is painless for most people.
  3. Do you have money elsewhere? An IRA, a spouse's accounts, or an old employer plan all count toward your picture.
  4. Have you looked at catch-up contributions? Once you turn 50, you can contribute above the standard limit. Annual limits change, so confirm current figures at tsp.gov and irs.gov.

When you look up participant statistics, check who published them, how recent they are, and whether they report an average or a median. The FRTIB posts plan data at frtib.gov and tsp.gov, and those figures get updated, so treat any number you read in an article, including this one, as a snapshot.

The takeaway

The gap between median and average tells you how unevenly retirement savings are spread. A big average with a small median means a few large accounts are carrying the headline. It does not mean you're failing.

Use the median to get a sense of the typical saver. Use age-based and salary-based benchmarks to get a sense of yourself. And use your own pension, Social Security, and savings projections to decide what really matters: whether the income will be there when you stop working.