ALLIANT ENERGY CORP 401(k): Empower, match 4% max
Alliant Energy Corporation 401(k) Savings Plan · LNT · CIK 352541
Empower is the recordkeeper named on the Form 5500 filed for this plan, the company that keeps the account records. Where to log in, and what the filing says.
Matched to this employer by sponsor name, not by an identifier stated in the filing.
Maximum employer match, as a share of pay
4%
ALLIANT ENERGY CORP matches 50% of the first 8% of pay.
From the Form 11-K filed June 16, 2026 ↗, covering the plan year ended December 31, 2025. Page data last updated July 28, 2026, when the Form 5500 bulk data was last refreshed. Why filings lag
On this page: what the employer actually paid in · the formula, word for word · when the money becomes yours · who can join · who holds your account · what the plan reports to the DOL · how it compares · what to do next
What ALLIANT ENERGY puts in, and what the plan costs
What ALLIANT ENERGY put into the plan, per active participant
$10,411
ALLIANT ENERGY CORP put $10,411 into this plan for each of its 2,987 active participants in plan year 2024. This is the whole employer side of the plan: matching money, profit sharing, non-elective and safe-harbor contributions, and reallocated forfeitures. The Form 5500 does not separate them, so this is what the employer put in and not the match.
ALLIANT ENERGY put in more per active participant than 87% of plans with 1,000–4,999 participants at utilities. The middle plan in that group of 80 reported $6,417. Utilities comes from business code 221100, which ALLIANT ENERGY entered on its own Form 5500. Sponsors pick that code themselves, so a code that does not describe what the employer does ranks the plan against the wrong companies.
Matched to this employer by sponsor name, not by an identifier stated in the filing. This record could cover another plan of the same employer.
What this figure cannot separate: how much ALLIANT ENERGY pays, and how much it puts in
This is dollars, not a rate. A Form 5500 carries no payroll, so the figure reflects both how much the employer puts in and how much the employer pays: two plans running the same formula report different amounts when one pays better. Crossing the peer group with industry holds most of that difference still, and none of it disappears.
This is one plan year, not an average. A true-up, a plan merger or a one-off contribution moves a single year on its own.
Source: DOL Form 5500 for the plan year ended December 31, 2024, EIN 391914946, plan 005 · DOL EFAST2 ↗
The $10,411 above is the Form 5500 figure for plan year 2024, and it counts every employer dollar on one line. ALLIANT ENERGY CORP also files a Form 11-K, which states the match formula for plan year 2025: the card below reads $1,980 a year at a $49,500 salary, and the same filing states employer contributions made outside the match. That second figure is what the formula pays one worker on that salary, and not an amount either filing reports. The two figures cover different plan years and measure different things, so neither one is the other one corrected.
What ALLIANT ENERGY puts in
$1,980
a year, at a $49,500 salary.
The match paragraph, word for word
“The Company provides matching contributions of $0.50 for each $1 contributed by the participant up to the first 8% of each respective participant's eligible compensation.”
What you contribute to collect all of it
Contribute at least 8% of your pay to collect the full match.
That is $3,960 a year at a $49,500 salary, and it scales with your own.
Vesting score
100 out of 100
How fast the employer’s money becomes yours. Higher than 48% of the 369 schedules we have scored.
It measures vesting speed and nothing else. It says nothing about the size of the match, what the plan charges, or the funds inside it.
Share of the employer's money that is the worker's at hire and at each of the first 6 anniversaries: 100%, 100%, 100%, 100%, 100%, 100%, 100%. The score is the average of those 7 readings.
Vesting, word for word
“Participants are immediately vested in their respective employee and Company contributions, except for the Company basic which are subject to a three-year cliff vesting schedule.”
The plan tops the match up after year end, so contributing unevenly through the year does not cost the worker part of it.
The same match paragraph, word for word
“The Company provides matching contributions of $0.50 for each $1 contributed by the participant up to the first 8% of each respective participant's eligible compensation.”
The wait before the match starts and the year-end true-up appear above when the filing states them. Neither is part of the score, and a filing that is silent on one of them is not a plan without it.
What the plan costs, against plans of its size
93rd percentile
$204.28 per participant in plan-paid administrative cost, more expensive than 93% of plans with 1,000–4,999 participants.
What is ALLIANT ENERGY's 401(k) match formula?
ALLIANT ENERGY's 401(k) employer match tops out at 4% of pay. The plan pays an annual true-up. What an annual true-up repays is the arithmetic behind that line: it matters most in a year when contributions land unevenly.
| Match formula | 50% of the first 8% of pay |
|---|---|
| Maximum employer match | 4% of compensation |
| True-upA year-end recalculation that repays match lost to uneven contributions. | Yes, annual true-up |
| Conditions | There are certain exceptions to the 8% Company matching contributions and Company basic contributions described above for bargaining unit employees. These exceptions include certain employees being ineligible for the Company basic contribution and the Company matching contribution being limited to $0.50 for each $1 contributed by the participant up to the first 6% of each respective participant's eligible compensation. There are also exceptions for certain bargaining unit employees who are eligible for a Company matching contribution of $0.50 for each $1 contributed by the participant up to the first 10% of each respective participant's eligible compensation. |
| Other employer contribution | The Company provides a basic (non-elective cash) contribution each pay period based on a percentage of the participant's eligible compensation as follows: Age Plus Years of Service Less than or equal to 49: 4%; 50-69: 5%; 70+: 6%. Certain bargaining unit employees are also eligible to receive an additional annual Company contribution of $1,000. |
At a $60,000 salary, contributing 8% ($4,800) earns the full employer match of $2,400 for the year.
What the filing says, word for word
“The Company provides matching contributions of $0.50 for each $1 contributed by the participant up to the first 8% of each respective participant's eligible compensation.”
Source: Form 11-K filed June 16, 2026, SEC EDGAR, corroborated by the filing's inline-XBRL facts · SEC ↗
What is ALLIANT ENERGY's 401(k) vesting schedule?
ALLIANT ENERGY vests the employer match immediately: 100% is yours as soon as it is paid in. Nothing is forfeited when you leave, which is not true of the two schedules that vest over time.
| Employer match vesting | Immediate: employer match is 100% vested when contributed |
|---|---|
| Your own contributions | Immediate: always 100% yours |
| Other employer contributions | Participants are immediately vested in their respective employee and Company contributions, except for the Company basic which are subject to a three-year cliff vesting schedule. |
Vesting, word for word
“Participants are immediately vested in their respective employee and Company contributions, except for the Company basic which are subject to a three-year cliff vesting schedule.”
Source: Form 11-K filed June 16, 2026, SEC EDGAR · SEC ↗
Who can join ALLIANT ENERGY's 401(k), and is enrollment automatic?
ALLIANT ENERGY enrolls new hires automatically at 8% of pay, rising 1% a year to 10% of pay.
| Plan entry | Eligible employees aged 18 and over may participate (i) immediately following 30 consecutive days of service with respect to employee deferral contributions and Company matching contributions and (ii) immediately with respect to Company basic contributions. |
|---|---|
| Automatic enrollment | Yes: default deferral 8% of pay; 30-day opt-out window; auto-escalation +1%/yr to 10%; default investment: an age appropriate target date fund |
Eligibility, word for word
“Eligible employees aged 18 and over may participate (i) immediately following 30 consecutive days of service with respect to employee deferral contributions and Company matching contributions and (ii) immediately with respect to Company basic contributions.”
Automatic enrollment, word for word
“An initial automatic 8% pre-tax deferral contribution rate has been applied to newly hired full-time eligible employees, unless the employee made a contrary election within 30 days of the automatic enrollment notice.”
Source: Form 11-K filed June 16, 2026, SEC EDGAR · SEC ↗
Who holds your account
Schedule C of the Form 5500 filed for plan year 2024 reports Empower, filed as “EMPOWER ANNUITY INS CO OF AMERICA”. That is the company paid to keep the account records: what is in an account, what went into it, and usually the site a participant signs in to. The trustee that holds the plan’s assets can be a different company, and this filing does not name it.
Matched to this employer by sponsor name, not by an identifier stated in the filing. This record could cover another plan of the same employer.
7,876 plans on file name Empower as their recordkeeper. Of those, the 7,813 with a computable fee have a median plan-paid cost of $165.72 per participant.
Participants log in at Empower ↗. 401(k) Monitor is not affiliated with Empower or with any other recordkeeper, and takes nothing for this link. It is here because that is where the account is.
| Recordkeeper | Empower |
|---|---|
| Recordkeeper address | 8515 East Orchard Road, Greenwood Village, CO 80111 |
What does the ALLIANT ENERGY plan report on Form 5500?
The ALLIANT ENERGY plan reported $1.4B in assets and 4,517 participants for plan year 2024.
Matched to this employer by sponsor name, not by an identifier stated in the filing. This record could cover another plan of the same employer.
| Plan named in the DOL record | Alliant Energy Corporation 401(k) Savings Plan |
|---|---|
| Total plan assets | $1,409,016,019 |
| Participants | 4,517 |
| Plan-paid admin cost per participant | $204.28 |
How that cost compares
This plan pays $204.28 per participant. The median across plans at utilities is $138.21, from the 387 of 407 whose Form 5500 yields a per-participant cost.
Read from the Form 5500 filing of Alliant Energy Corporation 401(k) Savings Plan, which has no page of its own here.
How does ALLIANT ENERGY's 401(k) match compare?
ALLIANT ENERGY CORP's maximum 401(k) match of 4% of pay compares with a median of 4% across the 269 companies in our data with a computable formula.
Employers worth reading next
Of the six employers below, three file at utilities, two report the same recordkeeper and one vests on the same schedule.
Maximum match 4% of pay. Also at utilities.
Maximum match 4% of pay. Also at utilities.
Maximum match 3% of pay. Also at utilities.
Maximum match 3.6% of pay. Same recordkeeper, Empower.
Maximum match 4% of pay. Same recordkeeper, Empower.
Maximum match 5% of pay. Vests immediately too, like ALLIANT ENERGY.
What can you do next?
- Read the Form 11-K on SEC EDGAR ↗
Form 11-K filed June 16, 2026, SEC EDGAR. Every match fact on this page comes from it.
- Changed jobs? Find an old 401(k) ↗
The Department of Labor's Retirement Savings Lost & Found, a free government database.
- This year's IRS contribution limits ↗
The official deferral and catch-up limits every formula operates under.
Questions this filing answers
What is ALLIANT ENERGY CORP's 401(k) match?
Alliant Energy Corp matches 50% of employee contributions up to 8% of eligible pay (plan year ended December 31, 2025).
When does the ALLIANT ENERGY CORP 401(k) match vest?
Immediate: employer match is 100% vested when contributed.
Does ALLIANT ENERGY CORP's 401(k) plan have automatic enrollment?
Yes: default deferral 8% of pay; 30-day opt-out window; auto-escalation +1%/yr to 10%; default investment: an age appropriate target date fund.
Who is the recordkeeper for ALLIANT ENERGY CORP's 401(k)?
Empower is named as the recordkeeper on the Form 5500 filed for Alliant Energy Corporation 401(k) Savings Plan for plan year 2024. That is the company paid to keep the account records: what is in an account, what went into it, and usually the site a participant signs in to. Matched to this employer by sponsor name, not by an identifier stated in the filing. This record could cover another plan of the same employer.
Source
The match formula, the vesting schedule and the enrollment rules on this page were read from one document: the Form 11-K annual report that ALLIANT ENERGY CORP filed with the US Securities and Exchange Commission for the plan year ended December 31, 2025. Each of those fields carries the filing sentence it was read from, expandable where the field appears. Nothing on this page was supplied by the employer to this site.
The plan assets, the participant counts, the plan-paid fees and the recordkeeper come from a different document, the plan’s DOL Form 5500 annual return, and the section that reports them links it. Comparisons with other employers are computed across the filings named in the section they appear in.
Read the filing on SEC EDGAR ↗
| Document | Form 11-K annual report |
|---|---|
| Filed with | US Securities and Exchange Commission (EDGAR) |
| Filed by | ALLIANT ENERGY CORP |
| SEC CIK | 352541 |
| Accession number | 0000352541-26-000038 |
| Plan | Alliant Energy Corporation 401(k) Savings Plan |
| Period of report | December 31, 2025 |
| Filed | June 16, 2026 |
401(k) Monitor is not affiliated with ALLIANT ENERGY CORP, with the Securities and Exchange Commission or with this plan’s recordkeeper, and publishes this page without their involvement. It republishes a public filing and says where it came from.
Cite this page
401(k) Monitor, “ALLIANT ENERGY CORP 401(k) plan facts”, from SEC Form 11-K accession 0000352541-26-000038, plan year ended December 31, 2025.
