The month my first hire uncapped a Form 5500 penalty I owed personally, at 68K MRR

I read that sentence in an email from a benefits administrator on a Tuesday, twelve days after we crossed 68K MRR, and I did not understand it for another hour. I thought she was telling me about a form. She was telling me that a filing I had skipped twice without consequence had, at some point I could not identify, stopped being a small tax problem and started being an uncapped daily meter that I owed personally.

Quick answer (2026). This diary is a composite. I write these from several small software companies I have run or advised, with the numbers moved and the details blended, so no single client is identifiable. The mechanism underneath is not blended and is sourced below. A retirement plan covering only an owner and a spouse files a Form 5500-EZ and answers to one agency, whose late-filing penalty is capped. The moment a non-owner employee joins that plan, it becomes a plan governed by Title I of ERISA, and a second agency arrives with a per-day penalty the statute prints at one figure, the regulations run at roughly double, and nobody caps at all. The cheap correction programme that fixes it costs a few hundred dollars. The gap between those two numbers is about a thousand to one.

The form I did not know I had changed

We had a solo 401(k) for about three years. Two participants, both owners. Every year our accountant filed a Form 5500-EZ, and in two of those years he filed it late, and nothing happened. That taught me the wrong lesson, which is that this form is administrative.

Then we hired an engineer and, nine months later, she became eligible and joined the plan. Nobody sent a letter. No threshold was announced. The plan simply stopped being an owner-only arrangement and became an employee benefit plan governed by Title I, and the return it owed changed from a 5500-EZ to a Form 5500-SF. We filed nothing that year, because the calendar reminder in our accountant's system still said EZ, and the EZ deadline had quietly stopped being the thing that mattered.

The IRS draws the line in exactly those terms. Its penalty relief page says eligible returns are Title I plans that "must file a Form 5500-series return (but not Forms 5500-EZ or 5500-SF for plans without employees)", and it notes separately that "The IRS has a separate Form 5500-EZ Late Filer Program" for plans covering only owners and spouses. Those are two different worlds with two different exposures, and the border between them is crossed by hiring.

The meter the statute prints, and the meter that actually runs

ERISA section 502(c)(2) is the DOL's authority. Read it and you get a number that sounds survivable. The Secretary may assess a civil penalty against a plan administrator of "up to $1,000 a day from the date of such plan administrator's failure or refusal to file the annual report".

That is not the number. Under the Federal Civil Penalties Inflation Adjustment Act, 29 CFR 2575.502c-2 adjusts it, "and to $2,063 for penalties assessed after August 1, 2016". So the printed statutory figure runs at about 2.06 times its face value, and the rate is selected by the date the penalty is assessed, not the date I failed to file. Sitting undiscovered does not freeze my rate at the rate in force when I erred. It exposes me to whatever the rate is when somebody finally notices.

Two more details from the procedural regulation, 29 CFR 2560.502c-2, which I am citing in text rather than linking because I want the link budget on the sources that carry the money. The clock starts on the date the report was due, "determined without regard to any extension for filing". The extension I had taken bought me nothing once I failed. And the clock keeps running, "continuing up to the date on which an annual report satisfactory to the Secretary is filed". It does not stop at a ceiling, because there is no ceiling in the text.

Two agencies, one omission, and only one of them has a ceiling

The IRS penalty for the same missing form sits at 26 USC 6652(e), and it is built differently in every way that matters. It charges "$250 for each day during which such failure continues, but the total amount imposed under this subsection on any person for failure to file any return shall not exceed $150,000".

So the same omission runs two meters at once, and the difference between them is a ceiling:

At 365 days late, the DOL meter reads 365 times 2,063, which is 752,995 dollars. The IRS meter reads 365 times 250, which is 91,250 dollars, comfortably under its cap. Call it 844,245 dollars in total, for a form.

The IRS cap binds at exactly 600 days, because 150,000 divided by 250 is 600. Past that date the IRS meter stops and the DOL meter does not. At 600 days the split is 1,237,800 against 150,000, or about 8.25 to one. At 1,000 days it is 2,063,000 against 150,000, or about 13.75 to one. The longer the failure sits undiscovered, the more lopsided the two agencies become, and the whole of the growth is on the side with no cap.

There is a second asymmetry, and it took me a while to see it because both sides use the same three words. The IRS penalty applies "unless it is shown that such failure is due to reasonable cause". That is a condition on liability arising at all. On the DOL side, reasonable cause appears as something the Department "may, in its discretion, waive all or part of a civil penalty" upon. Same vocabulary, different grammar. One is a door in the wall. The other is a door somebody else may choose to open.

The cheap door, and what it costs to walk through it

The Delinquent Filer Voluntary Compliance Program is the reason this story does not end with a number in the hundreds of thousands. The Department's December 2025 notice describes the relief as extending "the same $750 maximum penalty amount currently available to small plans filing a late Form 5500", the 2002 modification having capped the cumulative daily penalty for a plan year at that figure "for small plans and $2,000 for large plans".

Seven hundred and fifty dollars against 752,995 dollars is a ratio of about 1,004 to one on the DOL side alone. Against the combined 844,245 it is about 1,126 to one. I have never seen another compliance decision with that shape.

But the door has two prices that are not denominated in money, and neither was obvious to me.

The first is that it closes on a date somebody else controls. The programme is available only to an administrator who complies "prior to the date on which the administrator is notified in writing by the Department". The cheap route exists until the letter is sent. Not until I read it. Not until I understand it.

The second is that paying constitutes "a waiver of an administrator's right both to receive notices of intent to assess a penalty" and to contest the assessment. I bought certainty, and the currency was my ability to argue. For 750 dollars against an uncapped meter that is an easy trade, and it is still a trade, and I did not know I was making it at the time.

There is a third thing, and it is the one that actually changed how I think about being a plan administrator. The penalty is mine. The December notice states that civil penalties, including amounts paid under the programme, "shall not be paid from the assets of an employee benefit plan". The money is not the company's and it is certainly not the plan's. It is a personal liability, arising from a form, about an account holding money that was never mine.

The escape that belongs to the founder I used to be

The owner-only version of me had a different and much better deal, and I want to be precise about why, because I initially got it backwards.

A plan covering only owners and spouses is outside Title I. It has no DOL exposure at all, which means no uncapped meter. It faces only 26 USC 6652(e), capped at 150,000 dollars. And its correction programme is cheaper still: on the IRS page, "The fee is $500 per delinquent return, up to $1,500 per submission for the same plan."

Five hundred dollars, one agency, a ceiling. That was my position for three years while I filed late twice and learned nothing. The thing that ended it was not a bad decision. It was a good one. I hired somebody and put her in the plan.

What I got wrong

I had two working assumptions when I started reading, and the sources killed both.

The second one matters more than the first, because it relocates the risk. I had been looking for the moment I became too small to be protected. The actual trigger was the moment I became large enough to be covered.

Limits

Everything above is a range and a mechanism, not advice, and I am not a lawyer.

The 2,063 dollar figure is what the Code of Federal Regulations prints, and that same text says it holds only "before the effective date of the next adjustment for inflation made by the Secretary". The Department publishes annual adjustments. I did not locate the current year notice, so every DOL figure in this post is a floor, and the operative daily rate today is higher than the one I used.

The 750 and 2,000 dollar figures come from the background narrative of the December 2025 notice describing the 2002 modification. That notice does not restate the per-plan caps that apply across multiple delinquent years, and I have not read them, so I have not quoted them and my single-year arithmetic should not be stretched across several years.

No vendor price, plan tier or product fact is load-bearing anywhere in this post. Every figure is statutory or regulatory, which is deliberate, because those move on a published schedule and a vendor's pricing page does not.

What actually happened

The one thing I would tell you

Write down, somewhere your accountant can see it, the date the first non-owner joined your retirement plan. Not the date you hired them. The date they entered the plan. That is the date your filing obligation changed shape, your exposure lost its ceiling, and the penalty stopped belonging to the company and started belonging to you. Nobody will send you a letter about it, and by the time somebody does, the cheap door has already closed.