Alliant Energy Corporate Services, Inc. 401(k) Review & Grade
Alliant Energy Corporation 401(k) Savings Plan
Madison, WIUtilities3,126 active participantsPlan year 2024✓ Auto-enroll
Estimate from the plan's Form 5500 filing · How we grade
$9,948Employer $ per active participant
$14,380Employee $ saved per active participant
0.07%Direct admin cost, % of plan assets
$1.4BNet plan assets, end of year
$334,128Average balance per account
Score breakdown
- Employer generosity40.5 / 5081th percentile for employer $ per participant
- Low cost17.3 / 2569th percentile for low admin cost vs. same-size plans
- Employee saving13.8 / 1592th percentile for employee $ per participant
- Plan features10 / 10Auto-enrollment, Default investment
- Red-flag deductions-10 pts1 issue reported on the filing
Total score72 / 100 · Grade B
This plan vs. peers
Peers: Utilities plans with 2,500–9,999 active participants (38 plans).
| Measure | Percentile |
|---|---|
| Employer $ per participant | 81th |
| Lower admin cost | 69th |
| Employee saving | 92th |
| Peers that auto-enroll | 82% |
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Red flags from the filing
Late deposits: the filing says some employee contributions were not sent to the plan on time ($89 reported). That's money taken from paychecks that sat with the employer longer than the law allows.
What to do if you're in this plan
- Alliant Energy Corporate Services put in about $9,948 per active participant, more than the typical peer ($6,490). Contribute at least enough to collect the full match. Skipping it leaves part of your pay on the table.
- 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.
- The plan reported late deposits of employee contributions. Compare your pay stubs with your account statements, and contact the plan administrator if money shows up late.
- 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 | $31,097,640 |
| Participant (employee) contributions | $44,950,392 |
| Other contributions (incl. rollovers in) | $5,555,990 |
| Administrative expenses paid from the plan | $922,730 |
| Investment advisory & management fees | $593,832 |
| Benefits paid out | $191,647,485 |
| Net assets, start / end of year | $1.3B / $1.4B |
| Active participants, start / end of year | 3,265 / 2,987 |
| Participants with account balances | 4,217 |
| Auto-enrollment (feature code 2S) | Yes |
| Auditor | Deloitte & Touche LLP |
| Employer stock held by plan | $104,065,789 |
Largest service providers (Schedule C)
| Empower Advisory Group, LLC | $611,240 reported compensation |
| Empower Annuity Ins Co of America | $291,753 reported compensation |
| Fidelity Investments Inst Co, LLC | $37,145 reported compensation |
Source: DOL EFAST2 Form 5500 filing, acknowledgment ID 20251015103338NAL0002151443001, received 2025-10-15, EIN 39-1914946, plan #005, plan year 2024-01-01 to 2024-12-31. Verify at efast.dol.gov.