A job offer might say:
“401(k) with competitive company match.”
That sentence is almost useless.
A good retirement-plan comparison needs actual numbers:
- How much can the employer contribute?
- How much do you have to contribute to receive it?
- When does the employer money become yours?
- How expensive is the plan?
- What investments are available?
- Is there a waiting period?
- Does the plan offer Roth contributions?
- Does it support useful features such as a true-up or after-tax contributions?
You can answer some of those questions from public filings. Others require current employer documents.
That distinction is the key to researching a 401(k) correctly.
Quick answer: Use Form 5500 data to understand the employer's reported plan history, contributions, assets, participants, expenses and providers. Then use the current Summary Plan Description, fee disclosure and benefits materials** to verify the current match, vesting, eligibility, fund menu and withdrawal rules. Never treat historical plan-level employer contributions as if they were today's match formula.
The two-source rule
If you remember only one thing from this guide, make it this:
Public filing + current plan document.
Neither source is enough by itself.
Source 1: public Form 5500 data
Most private employer retirement plans file an annual Form 5500 series report with the federal government.
The filing can show information such as:
- Plan sponsor and legal plan name
- Plan year
- Number of participants
- Plan assets
- Employer contributions reported for the year
- Employee contributions reported for the year
- Certain plan expenses
- Service-provider information in applicable schedules
- Attachments and audit information for some plans
The Department of Labor provides a public Form 5500 filing search ↗.
401(k) Plan Report turns those filings into employer pages and comparable metrics so you do not have to decode every raw form yourself.
Source 2: current plan documents
The public filing is historical and plan-level. It does not reliably tell you the current employee experience.
For that, you need current documents such as:
- Summary Plan Description, or SPD
- Benefits enrollment guide
- Current matching-contribution description
- Participant fee disclosure
- Investment menu
- Summary of material modifications if the plan changed
The Department of Labor calls the SPD one of the most important documents participants receive because it explains how the plan operates. See the DOL's Plan Information ↗ guidance.
Start with the employer page
If you are comparing jobs, do not start by Googling “Company X 401k reddit” and reading a three-year-old comment.
Start with the plan itself.
Have an offer in hand?** Search the employer or compare two plans side by side before assigning a dollar value to the retirement benefit.
Look at several years if available. One filing can be unusual. A trend is more informative.
Metric 1: reported employer contributions
This is one of the most useful public numbers—and one of the easiest to misuse.
Suppose a filing shows $50 million of employer contributions and 10,000 active participants.
A simple plan-level metric would be:
$50 million ÷ 10,000 = $5,000 of reported employer contributions per active participant
That can help compare the overall level of employer money going into different plans.
But it is not the same as saying:
“The average employee gets a $5,000 match.”
Employer contributions can include:
- Matching contributions
- Nonelective employer contributions
- Profit-sharing contributions
- Safe-harbor contributions
- Other employer amounts
Participants also have different pay, tenure and eligibility.
That is why 401(k) Plan Report labels filing-derived metrics carefully.
Use public contributions as evidence of employer plan funding. Use the current plan document for the actual match formula.
Our average 401(k) match guide explains the difference.
Metric 2: assets per participant
Plan assets divided by participants can provide context about the plan population.
A very large asset-per-participant figure might reflect:
- An older workforce
- Higher-paid employees
- Long tenure
- Strong historical contributions
- Strong market performance
- Rollovers left in the plan
A low figure might reflect:
- A younger workforce
- High turnover
- Recent plan growth
- Lower contribution rates
- Lower pay
It is useful context, not a quality score.
Do not rank employers solely on assets per participant. A brand-new employee gets no special benefit because older colleagues built large balances over 25 years.
Metric 3: plan expenses
Fees deserve closer attention because they directly reduce participant returns when charged to plan assets or accounts.
Look separately at:
- Plan-level administrative expenses
- Fund expense ratios
- Recordkeeping charges
- Advisory or managed-account charges
- Individual transaction fees
Form 5500 data can help identify certain plan-paid expenses. It cannot always tell you the exact all-in cost a specific employee will face in a specific investment.
The participant fee disclosure and investment menu are better sources for that.
Read our 401(k) fees guide before comparing costs across plans.
Metric 4: participant count and plan size
Plan size matters because large plans can have bargaining power.
A plan with tens of billions of dollars may be able to offer low-cost institutional investments that an individual investor cannot access on the same terms.
But large does not automatically mean good.
A smaller plan can still offer inexpensive index funds and reasonable administration.
Use size to choose appropriate peers—not as the final score.
Comparing a 60-person architecture firm with a 250,000-person retailer tells you very little about whether either employer is doing a good job for its workforce.
Metric 5: trend over time
A single year is a photograph. Several years are a movie.
Look for changes in:
- Participants
- Employer contributions
- Plan assets
- Administrative costs
- Providers
A sharp change may have a simple explanation:
- Acquisition
- Layoffs
- Plan merger
- Recordkeeper change
- One-time contribution
- Corporate restructuring
Do not turn every change into a scandal. Use it as a question to investigate.
Now get the current match formula
Once you understand the public plan record, get today's match.
You need the full formula, not “up to 6%.”
These are completely different:
Plan A: 100% match on the first 6% of pay you contribute.
Plan B: 50% match on the first 6% of pay you contribute.
Both can be described casually as “a 6% matching program,” but Plan A can provide twice as much employer money.
For a $120,000 salary:
| Plan A | Plan B | |
|---|---|---|
| Employee contribution needed for full match | $7,200 | $7,200 |
| Employer maximum | $7,200 | $3,600 |
| Employer value as % of salary | 6% | 3% |
Write the formula down in dollars at your salary.
Check the contribution required to get the full match
Employer value alone is not enough.
A plan might contribute 4% if you save 4%. Another might require you to save 8% to receive the same 4% employer amount.
If cash flow is tight, that difference matters.
Use this four-line calculation:
- Offered salary
- Employee contribution needed for maximum match
- Maximum employer dollars
- Net paycheck impact of your contribution
The how much should I contribute guide can help with the savings decision after you know the formula.
Check vesting before counting employer money as compensation
A $10,000 employer contribution that you forfeit when you leave after two years is not worth $10,000 to someone who expects to leave in two years.
Find out whether employer contributions are:
- Immediately vested
- Cliff vested after a set period
- Gradually vested over several years
Your own employee salary deferrals are yours. Employer contributions can follow a vesting schedule.
Read What Does Vested Mean in a 401(k)? if the offer documents use vesting language you do not understand.
Put vesting into the job-offer math
Suppose Offer A pays $140,000 and offers a $7,000 annual employer contribution that vests immediately.
Offer B pays $145,000 and offers $9,000 per year, but you expect to leave after two years and the employer money requires three years to vest.
On a spreadsheet that blindly adds salary plus match, Offer B looks better.
In your likely real-world scenario, you may receive none of that $18,000 of employer money.
Expected tenure changes benefit value.
Check the eligibility waiting period
Can you start contributing immediately?
Does the employer match begin immediately?
Or do you wait 30 days, 90 days, six months or longer?
A delay can materially reduce first-year value.
If two jobs have the same annual match but one starts on day one and the other starts after six months, they are not the same first-year benefit.
Ask the recruiter for the effective date, not just “yes, we have a 401(k).”
Check for a match true-up
A true-up matters if the match is calculated paycheck by paycheck and you contribute unevenly through the year.
Example:
You receive a large bonus, front-load your 401(k), and hit the annual contribution limit in September.
If you stop contributing for the rest of the year, you may miss matching contributions on later paychecks if the employer uses a per-pay-period formula and has no true-up.
A true-up can reconcile contributions over the full year, depending on the plan terms.
Ask:
“If I hit the employee limit before year-end, does the plan provide an annual match true-up?”
That one question can save a high saver thousands of dollars.
Check Roth and after-tax contribution options
A modern plan may offer several contribution buckets:
- Traditional pre-tax 401(k)
- Roth 401(k)
- Non-Roth after-tax employee contributions
Do not assume all three are available.
If you are a high saver, after-tax contributions plus in-plan Roth conversion or in-service rollover features can materially expand planning options. See our after-tax 401(k) guide.
If you are deciding between tax treatments, read Traditional 401(k) vs. Roth 401(k).
Check the investment menu you would actually use
Do not review 25 funds equally.
Pick the strategy you would use and inspect those options.
For example, if you want a simple three-fund portfolio, check whether the plan has:
- Broad U.S. stock index fund
- Broad international stock index fund
- Broad bond index or suitable bond option
If you prefer a target-date fund, examine:
- Expense ratio
- Underlying asset mix
- Whether the fund is an index or active series
- How aggressive the glide path is
A plan can have mediocre average fund costs but still contain excellent low-cost options. Your actual portfolio matters more than the menu average.
Check the participant fee disclosure
The Form 5500 is not your personal fee statement.
For participant-directed individual account plans, current disclosures can show plan and investment information much closer to what you personally pay.
Ask HR or the plan administrator for the current participant fee disclosure and investment comparison chart.
The Department of Labor's retirement-plan guide, What You Should Know About Your Retirement Plan ↗, explains the participant documents and notices you should receive.
Check provider names, but do not rank a plan by provider alone
“Fidelity 401(k)” or “Empower 401(k)” is not a plan design.
The recordkeeper provides the platform, but the employer and plan fiduciaries make important choices about:
- Match
- Eligibility
- Vesting
- Investments
- Fees
- Loan rules
- Distribution features
Two employers using the same recordkeeper can have dramatically different plans.
That is why employer-level data is more useful than a generic provider review when you are comparing job offers.
The eight questions to send a recruiter
You can copy these almost word for word:
- What is the exact 401(k) match or employer-contribution formula?
- How much do I need to contribute to receive the maximum employer amount?
- When do I become eligible to contribute, and when do employer contributions begin?
- What is the vesting schedule for employer contributions?
- Does the plan offer both traditional and Roth 401(k) contributions?
- Does it allow non-Roth after-tax contributions?
- Is there an annual match true-up?
- Can you send me the current plan summary and investment/fee information?
A serious employer should be able to provide this information or connect you with someone who can.
Turn the 401(k) into compensation dollars
Once you have the terms, make the benefit comparable with salary.
Assume:
- Salary: $150,000
- Match: 100% of first 5%
- You will contribute at least 5%
- Match immediately vested
- No eligibility delay
Maximum employer value = $7,500 per year.
If another offer pays $155,000 but has only a 2% maximum match, that employer contributes up to $3,100 at a $155,000 salary.
The salary difference is $5,000.
The maximum 401(k) employer-contribution difference is $4,400.
The total-compensation gap is much smaller than salary alone suggested.
Then add health insurance, bonus, equity, paid leave and other benefits.
A job decision should not be made on 401(k) alone, but the plan is real compensation.
What Form 5500 cannot tell you
This deserves a clear list.
Do not use a filing to claim you know:
- Today's exact match formula
- Your personal employer contribution
- Today's vesting schedule
- Whether you are currently eligible
- Whether the plan currently offers Roth contributions
- Your personal account balance
- Your personal fund expense ratio
- Whether your specific withdrawal or loan will be approved
Public filings are powerful because they create historical plan-level transparency.
They are dangerous when someone pretends historical plan-level numbers are current individual benefits.
The 401(k) Plan Report methodology should make that boundary explicit on every employer page and ranking.
A 15-minute employer 401(k) research process
Minutes 1–3: search the employer
Use 401(k) Plan Report search. Confirm the plan and latest filing year.
Minutes 4–6: look at the filing metrics
Review:
- Employer contributions
- Participants
- Assets
- Expenses
- Multi-year trend
Minutes 7–9: compare peers
Use plan comparison or employer rankings to see whether the plan looks unusual for organizations of similar size.
Minutes 10–12: read current benefit terms
Find the match, vesting and eligibility rules.
Minutes 13–15: convert to dollars
Calculate maximum employer dollars at your salary and adjust for likely vesting.
Now you have a benefit you can actually compare.
Frequently asked questions
Can I look up a company's 401(k) plan before I work there?
Often yes. Form 5500 filings for many private employer plans are public. Current employee-specific plan documents may be harder to obtain before you join, but recruiters can often provide benefits summaries.
Does Form 5500 show the employer's 401(k) match?
It shows reported plan-level employer contributions, but that is not the same thing as the current match formula. Employer contributions can include several types of employer money.
Where can I find a Form 5500?
The Department of Labor's EFAST2 filing search provides public access to Form 5500 series filings. 401(k) Plan Report organizes filing data into employer pages for easier comparison.
What document shows the current 401(k) rules?
The Summary Plan Description is a key source. Current benefits guides, fee disclosures and plan amendments can also matter.
How should I compare two employer matches?
Convert each formula into maximum employer dollars at the salary offered, then account for how much you must contribute, eligibility timing and vesting.
Is a bigger employer automatically likely to have a better 401(k)?
No. Large plans can have bargaining advantages, but plan design still varies. Compare actual costs, contributions and features.
Bottom line
The best way to research an employer's 401(k) is not to choose between public data and current plan documents.
Use both.
The public filing tells you what the plan has reported historically. The current employer documents tell you what you are being offered today.
Put those together and a vague sentence like “competitive 401(k)” becomes something you can actually value.