T-Mobile USA, Inc. 401(k) Review & Grade
T-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust
Bellevue, WAInformation67,820 active participantsPlan year 2024✓ Auto-enroll
Estimate from the plan's Form 5500 filing · How we grade
$2,468Employer $ per active participant
$5,602Employee $ saved per active participant
0.03%Direct admin cost, % of plan assets
$9.1BNet plan assets, end of year
$115,458Average balance per account
Score breakdown
- Employer generosity10.3 / 5021th percentile for employer $ per participant
- Low cost21.9 / 2587th percentile for low admin cost vs. same-size plans
- Employee saving3.1 / 1521th percentile for employee $ per participant
- Plan features10 / 10Auto-enrollment, Default investment
- Red-flag deductions-13 pts2 issues reported on the filing
Total score32 / 100 · Grade D
This plan vs. peers
Peers: Information plans with 10,000+ active participants (30 plans).
| Measure | Percentile |
|---|---|
| Employer $ per participant | 21th |
| Lower admin cost | 87th |
| Employee saving | 21th |
| Peers that auto-enroll | 60% |
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Red flags from the filing
Benefits not paid when due: the plan reported failing to pay some benefits on time.
Corrective distributions: the plan refunded $50,745 in contributions, which usually means it failed annual nondiscrimination testing.
What to do if you're in this plan
- T-Mobile USA put in about $2,468 per active participant, below the typical peer ($5,217). Any match is still an instant return, so contribute enough to get all of it.
- The filing shows total dollars, not the match formula. Ask HR for the Summary Plan Description so you know the exact match and vesting schedule.
- Fund expense ratios aren't in the filing. Look them up in your 404(a)(5) fee disclosure and favor low-cost index or target-date funds.
- The plan auto-enrolls employees. Check your default contribution rate. Defaults are often lower than what it takes to get the full match.
- Changing jobs? You can usually leave the money in the plan, move it to your new employer's plan, or roll it into an IRA. Don't cash out: you'd owe taxes and possibly a 10% penalty.
The raw numbers from the filing
| Employer contributions | $167,364,416 |
| Participant (employee) contributions | $379,921,899 |
| Other contributions (incl. rollovers in) | $30,474,536 |
| Administrative expenses paid from the plan | $2,175,543 |
| Contract administrator fees | $22,800 |
| Investment advisory & management fees | $1,829 |
| Other admin expenses | $286,712 |
| Benefits paid out | $1,039,084,700 |
| Net assets, start / end of year | $8.3B / $9.1B |
| Active participants, start / end of year | 66,624 / 69,015 |
| Participants with account balances | 78,399 |
| Auto-enrollment (feature code 2S) | Yes |
| Auditor | Clark Nuber, P.S. |
Largest service providers (Schedule C)
| Fidelity Investments Institutional | $1,831,894 reported compensation |
| Mercer Investments LLC | $217,212 reported compensation |
| Clark Nuber | $123,000 reported compensation |
Source: DOL EFAST2 Form 5500 filing, acknowledgment ID 20251009173756NAL0003790035001, received 2025-10-09, EIN 91-1983600, plan #001, plan year 2024-01-01 to 2024-12-31. Verify at efast.dol.gov.