Two neighbors, both 58, both earning about $95,000, sat on a back deck last summer comparing notes. Dana works for a federal agency. Marcus is a project manager at a mid-sized manufacturer. Marcus mentioned his 401(k) balance, and Dana said hers was lower. He felt a flash of smugness, right up until she told him what she expected to receive from her pension each month.

That's the trap in comparing federal savers to private-sector savers. If you look only at the account balance, you're comparing a whole pie to one slice.

The three-legged stool, with one leg often missing

Most FERS employees build retirement income from three sources: a defined benefit pension, Social Security, and the Thrift Savings Plan. Many private-sector workers have only two, Social Security and a 401(k), because traditional pensions have largely disappeared from private employers.

The FERS basic benefit is generally 1% of your high-3 average salary for each year of service, or 1.1% if you retire at 62 or later with at least 20 years. For Dana, with 30 years and a high-3 of $95,000, that's roughly $28,500 a year at 1%, or about $31,400 at 1.1%. It's guaranteed and adjusted for inflation under certain rules. Marcus would need a very large balance to replicate that on his own.

So when you read benchmark data on 401(k) balances, remember that the TSP number represents only part of what a federal career produces.

Contribution rates: the match is better than average

Federal employees under FERS get an automatic 1% agency contribution whether they put in anything or not. Then the agency matches dollar for dollar on the first 3% you contribute and 50 cents on the dollar for the next 2%. Contribute 5% and you collect a total of 5% from the agency.

Private-sector matches vary widely. Large industry surveys, including Vanguard's annual How America Saves report, show typical employer contributions landing somewhere around 3% to 4% of pay, with many plans using a formula like 50 cents per dollar up to 6%. Some employers offer nothing. Others are more generous than the government.

Overall savings rates tell a similar story. Vanguard has recently reported total savings rates, employee plus employer, around 11% to 12% of pay for its participants. A federal employee contributing 10% with the full agency 5% is in the same range or a bit above it, with a floor that doesn't depend on which employer you happened to land with.

Participation: where automatic features pay off

Plenty of private employers now auto-enroll workers, but not all do, and not all at meaningful rates. Participation in 401(k) plans differs sharply by company size. Workers at small firms are far less likely to have a plan at all.

Federal employees hired under FERS are automatically enrolled in the TSP, and participation among FERS employees is consistently high. The structure makes saving the default, which matters more than most people admit. Behavioral research has shown for years that defaults beat good intentions.

Costs: a quiet advantage

The TSP is famous for low expenses. Its fund expense ratios have run a few hundredths of a percent, often cited around 0.05% in recent years. Many private plans, especially at smaller employers, charge noticeably more once you add up fund fees, recordkeeping, and advisory costs.

Here's why that matters. Say two workers each contribute $10,000 a year for 30 years at a 6% annual return before costs. A fee difference of 0.7% per year might cost a saver tens of thousands of dollars by retirement. The exact gap depends on the plan and the market, but the direction is clear: small differences compound quietly.

Check current TSP expense ratios at tsp.gov. They change a little each year.

Where private savers may have the edge

It's not all one-sided. Private plans can offer things the TSP doesn't.

  • Wider investment menus. Many 401(k) plans offer dozens of funds, target-date families from several providers, or a brokerage window. The TSP has a deliberately short lineup: the G, F, C, S, and I funds plus lifecycle funds.
  • Higher ceilings in some plans. Some employers allow after-tax contributions and in-plan Roth conversions, which let high earners save beyond the standard limit. The TSP does not currently work that way.
  • Higher pay in some fields. A private-sector executive or engineer may earn enough to save far more in raw dollars than a mid-grade federal employee.
  • Stock-based compensation. Equity grants and profit sharing can add wealth that federal employees rarely see.

Also consider the pension's cost. FERS employees pay into the system through payroll deductions. For those hired in 2013 or later, the pension contribution is higher than for earlier hires. Your take-home pay reflects that.

Portability and vesting

Marcus has changed jobs four times. Each move meant tracking down an old plan, rolling it over, or leaving it behind. Vesting schedules at private employers can run up to six years for some matching contributions, so job-hoppers sometimes forfeit part of the employer's money.

Federal employees who stay in government, even moving between agencies, keep one TSP account and one continuous service record. The agency contributions vest after a short period, generally three years for the automatic 1% for most employees (matching contributions vest immediately). The flip side: someone who leaves federal service after a few years walks away without a meaningful pension, and the benchmark advantage shrinks fast.

Length of service is the hinge for everything here.

What about military and CSRS savers?

Military members under the Blended Retirement System receive an automatic 1% government contribution, a match up to 4% more, and a lifetime pension based on 2% of base pay per year of service. That's a strong package, though most service members don't serve 20 years, and those who leave earlier take only the TSP with them.

CSRS employees, a shrinking group, have no Social Security for much of their careers and a richer pension formula, with no agency match in the TSP. The comparison with private savers looks quite different for them.

How to benchmark yourself honestly

Instead of asking "Is my balance higher than the average 401(k) saver's?" try these questions:

  1. What is my total savings rate, including the agency contribution?
  2. What will my pension replace? Estimate it, then add Social Security, and see what gap the TSP must fill.
  3. What are my costs? Know your expense ratios.
  4. How long will I stay? Service length changes the entire picture.

A rough rule many planners use is to aim to replace 70% to 80% of pre-retirement income, though your needs may differ. A federal employee with a 30-year career can often cover a big share of that from the pension and Social Security, leaving the TSP to fund the rest and to provide flexibility.

The takeaway

Federal savers usually come out ahead on structure: a pension, automatic enrollment, a dependable match, and low costs. Private savers sometimes come out ahead on raw pay, investment options, and equity compensation. Neither group wins by default. The savers who do best, in either camp, contribute steadily, keep costs low, and stay put long enough for compounding to work.

Annual contribution limits, catch-up amounts, and other thresholds change each year, so confirm current figures at tsp.gov and irs.gov before you set your elections.