Form 5500-EZ Deadlines

Solo 401(k) owners tend to be very confident right up until someone asks a deceptively simple question:

"Did you file the 5500-EZ?"

Cue the silence. Not the thoughtful, contemplative kind. The oh no, I think I might be in trouble kind.

Form 5500-EZ is one of those retirement plan requirements that feels completely irrelevant… right up until it feels catastrophic. Usually, this realization hits because the penalties are wildly out of proportion to the mistake, the notice arrives three years late, and the letter is written in that special IRS tone that suggests you have personally offended the United States Government.

What makes this form especially frustrating is that the rule itself isn't complicated. There's no complex actuarial math. No tax payment. No check to mail. It is an informational return. It is aggressively boring.

And yet, it has caused more panic among Solo 401(k) owners than almost any other requirement.

Let's talk about why.

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The Rule (The Part Everyone Misses)

Form 5500-EZ is required once your Solo 401(k) plan assets exceed $250,000 at the end of the plan year.

That's it. That's the tripwire.

Once the plan crosses that threshold, the filing requirement turns on—and it stays on. You can't turn it off by dropping back down to $249,000 next year. You are now in the system until the plan is terminated and a final return is filed.

For clarity:

• The threshold is $250,000.

• It's measured at year-end.

• It includes all plan assets (cash, stocks, crypto, that rental property you bought).

• And yes—the $250,000 threshold still applies for 2025.

There is no inflation adjustment. No indexing. No "close enough" buffer. Hit $250,001 on December 31? Congratulations. You've won a prize. The prize is mandatory government paperwork.

Why This Sneaks Up on People

Solo 401(k)s have a habit of growing quietly. You have no employee census. No HR department to nag you. No third-party administrator whose job it is to email you reminders. It's just you, acting as the CEO, CFO, and evidently, the negligent Compliance Officer.

Rollovers come in from old corporate jobs. Markets have a good year. You make consistent contributions. Suddenly, your "little" plan isn't so small anymore.

The problem is that nothing dramatic happens the moment you cross the threshold. No siren goes off. No postcard arrives in the mail. No "Great Job Saving!" sticker from the Treasury Department.

The first sign is often a penalty notice that arrives years later—after you've missed three consecutive filings—with fines stacked like pancakes. That is usually when the panic attack begins.

One Very Common (and Very Costly) Misunderstanding

The $250,000 threshold applies to the plan, not to each individual account.

This is where a lot of Solo 401(k) owners get tripped up, especially when a spouse is involved.

Here's the classic scenario:

• Husband's Solo 401(k) account: $130,000

• Wife's Solo 401(k) account: $130,000

Both people look at their dashboards and think, "I'm under $250k. I'm safe." But the IRS isn't looking at you as individuals. From a compliance standpoint, you are one employer plan with two participants.

Total plan assets: $130,000 + $130,000 = $260,000

That means the plan has crossed the threshold. Form 5500-EZ is required.

It does not matter that the accounts are tracked separately. It doesn't matter that you think of them as separate. In the eyes of the IRS, your marriage is a single financial organism. This is why the filing requirement turns on sooner than expected—and why couples are often blindsided by a form they didn't realize applied to them at all.

The Penalties (Why This Form Has a Reputation)

Historically, the penalties for missing a Form 5500-EZ were… aggressive.

The statutory penalty could be up to $250 per day, capped at $150,000 per return.

Let that sink in. Not $150,000 total. $150,000 per missed filing.

So if you crossed the threshold in 2019 and didn't know it, and you missed filings for 2019, 2020, 2021, and 2022? That's four separate disasters, not one.

Now, the IRS has introduced penalty relief programs to soften this blow—assuming you turn yourself in before they catch you. But the emotional damage is usually done long before anyone reads the fine print about amnesty.

The Filing Deadline (Because April 15 Wasn't Enough)

Form 5500-EZ generally follows the business tax filing calendar, not the personal April 15 deadline everyone is wired to expect.

Standard Deadline:

• July 31 of the year following the plan year.

• So for a 2025 plan year, the deadline is July 31, 2026.

Extension Available: If you file a valid extension for your business tax return, the Form 5500-EZ deadline is automatically extended to October 15. You don't need to file a separate extension for the 5500-EZ; it rides shotgun with your business return.

This is helpful, but it creates a false sense of security. People assume that because they "extended everything," they're covered—even if they didn't realize a 5500-EZ was required in the first place. Extending a form you didn't know existed doesn't actually help you file it.

Why People Think They're Exempt (But Aren't)

There are a few common excuses that people use to comfort themselves. None of them work:

• "It's just me—I have no employees." (Irrelevant.)

• "It's a Solo 401(k), not a 'real' 401(k)." (It is real to the Department of Labor.)

• "My custodian (brokerage) didn't say anything." (They never will. It's not their job.)

• "I didn't take any distributions." (Doesn't matter.)

• "I didn't even contribute that much this year." (Also doesn't matter.)

Once the asset threshold is crossed, the plan is treated as large enough that the IRS wants visibility. The form is how they check the box. This isn't about taxation. It's about oversight.

The Real Lesson: Scale Changes Expectations

This isn't really a story about paperwork. It's a story about scale.

When a Solo 401(k) is small, the IRS treats it like a handshake deal between you and yourself. Once it grows past a certain size, it stops being invisible. At that point, the government expects annual reporting and a paper trail.

The Form 5500-EZ is ironic because it is incredibly simple to complete.

• Basic plan info? Check.

• Asset values? Check.

• Is the plan active? Yes.

That's it. No forensic accounting required. Yet it causes disproportionate anxiety because people don't know it exists until they've already failed to file it.

The best time to learn about this form? Before you need it.

The second-best time? Before the IRS sends you a letter asking why they haven't heard from you.

Because most Solo 401(k) owners didn't forget. They were simply never told the game had started.

I write one of these every day, one retirement rule, explained in plain language and verified against the source. The daily email is free: subscribe here.

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Disclaimer

This article is for educational and informational purposes only. It is not tax, legal, or financial advice and does not create an advisor–client relationship.