The S corp election deadline is a formula, not 15 March, and the tests behind it cannot be repaired at all

I gave the s corp election deadline as 15 March for years, and it is not a date. It is an arithmetic instruction tied to your own tax year, and the calendar version only works for companies whose year starts on 1 January. I was wrong in a way that sounds harmless and is not. It was bad advice, because the founders who need the exception are exactly the ones whose year starts somewhere else.

The instruction states it plainly. File the form “no more than 2 months and 15 days after the beginning of the tax year the election is to take effect”, or at any time during the preceding tax year. Two months and 15 days from your own start, not from January.

I went looking for the exact wording after a founder asked about a company incorporated in September. I read the whole instruction rather than the summary paragraph everybody quotes, and the more useful finding turned out to have nothing to do with the deadline at all, which is roughly the opposite of what I expected when I opened the page looking for a date to confirm. Missing it is the most repairable mistake in this area. What follows is the rule, what the repair costs, and the 2 conditions that no repair reaches.

The deadline is a formula, not a day

The instruction even defines how to count. The 2 month period “begins on the day of the month the tax year begins and ends with the close of the day before the numerically corresponding day of the second calendar month following that month”. I had to read that sentence 3 times. Read once, the sentence is noise. Read with a calendar, it is simple.

A company whose tax year starts on 1 January counts to 1 March, then adds 15 days, and lands on 15 March. That single case is where the famous date comes from. A company whose year starts on 12 September lands on 27 November instead, by exactly the same counting, and I have never seen that date printed anywhere at all. No poster anywhere carries that date.

There is a second door that people forget. The instruction gives it as the second half of the same sentence: you may file “at any time during the tax year preceding the tax year it is to take effect”. So a company that decides in October can elect for next year without any rush at all, and I have never once seen a founder use that route.

Count it yourself, once

The arithmetic takes a minute and then never has to be done again. Take the first day of your tax year. Move forward 2 calendar months to the same day number, step back 1 day, add 15, and write the answer somewhere you will find it again, because this is a calculation you should never have to do twice in the life of the company. Our own worked results for 4 common start dates:

In a first year the tax year usually begins when the company starts doing business. Not when the certificate was stamped. Those 2 dates are often weeks apart, and I have seen them 4 months apart. That gap is where I have seen the confusion live. Write down which date you counted from. In 3 years nobody will remember it.

Missing it is the cheap mistake

Here is the part that reorders the whole subject. A late election is repairable. The repair is set out in a revenue procedure rather than negotiated with anybody, which means the answer to a missed deadline is a checklist and not a conversation, and that is the single most useful thing in this piece. The company has to be eligible in every other way. The only reason it failed must be the late filing. There has to be reasonable cause, and the company must have “acted diligently to correct the mistake upon discovery of its failure to timely file”.

The outside limit here is surprisingly generous. The form has to be filed “within 3 years and 75 days of the date entered on line E”, which is the date you want the election to start. That is 3 whole years, not 3 weeks.

The last condition is the one that takes real work: statements from all shareholders who held stock between the intended start date and the filing, confirming they reported their income consistently with the election on every affected return. With 2 founders it is an afternoon of email. With 9 shareholders, 1 of whom has stopped answering email, it is a project.

The 3 lines on the form that quietly fail it

The deadline gets all the attention and the form itself gets none. Three items on it do real work, and I cannot tell you which of the 3 fails most often, because rejections are not published in any form that can be counted.

Column K is the shareholder consent, and the instruction lists it as a test in its own right: the company qualifies only if “each shareholder consents as explained in the instructions for column K”. Every single shareholder signs it. A missing signature is not a formality, it is a failed condition, and it is the most common reason a filing comes back.

Line E is the date you want the election to start. It looks like a field. It is a decision, because the relief clock later runs from whatever you wrote there rather than from the day you actually filed. Getting it wrong shortens or lengthens the repair window without anybody noticing.

Part II is only for companies asking for a tax year other than one ending 31 December. Most companies skip it correctly. The trap is the company that wants a fiscal year because its business is seasonal and does not realise it has to establish a business purpose rather than simply state a preference, and the instruction warns that automatic approval is unavailable to a company under examination or before an appeals office or a federal court.

There is also a short list of companies that cannot elect at all, whatever they file. The list names “a bank or thrift institution that uses the reserve method of accounting for bad debts”, an insurance company taxed under the relevant subchapter, and a domestic international sales corporation or a former one. None of that touches an ordinary software company. Read the list once and stop wondering.

What I would check before the deadline matters at all

Run the eligibility tests first. They decide whether the deadline is even your problem. Unlike the deadline, and this is the whole reason to run them first, none of them can be repaired afterwards by any procedure at all, which means a company can file perfectly on time and still be ineligible for reasons that were settled years earlier by a cheque nobody thought about.

Start by counting the shareholders you actually have. The instruction says the company “has no more than 100 shareholders”, and adds that you may “treat an individual and his or her spouse (and their estates) as one shareholder for this test”. Almost nobody hits the ceiling. Check it once anyway. Write the number down and stop thinking about it.

Then read your own cap table for a second class of stock. The test is that the company “has only one class of stock”, and the instruction adds that differences in voting rights are disregarded. Founder shares with 10 votes are fine. Shares with a preference on distributions are not, and that is what a convertible instrument turns into on the day it converts.

Then check citizenship and residence, which is the test I have watched kill more elections than every other test combined. The rule allows no nonresident alien shareholders at all, none. Not a small number of them, and not a small percentage either: the rule reads as a flat prohibition, so a single shareholder living abroad ends the question for the whole company, whatever the other 99 owners want and whatever the company has already filed.

That last test catches a specific kind of company: the one that took an angel cheque from a friend abroad in year 1 and forgot. I have watched it surface 2 years later in a conversation about payroll. There is no relief procedure for it, because nothing was late.

None of this is tax advice and I am not qualified to give it. Whether the election is worth making at all is a question for whoever prepares your return, and it turns on payroll, profit and what you take out, not on the paperwork.

What the election is doing underneath

Worth being clear about what is being elected, because the form does not say it anywhere. The company does not become a different kind of company. It stays exactly what it was, with the same owners, the same bank account, the same registered agent and the same certificate on file in the same state, and the only thing that moves is how its profit is taxed and who reports it.

That is why the tests ask about shareholders and not about the business. The rules exist to keep the arrangement simple enough to push profit out to a small, identifiable group of people who will report it on their own returns. A company with 400 owners breaks the model. So does a company whose owners the tax authority cannot reach, which is why the counts and the residence test read the way they do.

It also explains the one class of stock rule. That rule looks arbitrary until this point. If profit flows out to owners automatically, the split has to be knowable from the share register alone. A second class with a different claim on distributions turns a simple division into a negotiation, and at that point the model stops working, which is the entire reason a convertible instrument that has quietly converted can end an election that nobody knew was at risk.

I do not know whether the election is right for any particular company, and this piece is not trying to answer that. I am trying to stop the paperwork deciding it for you by accident.

A short digression about why the date got famous

15 March is not a legal deadline. It is a very common one. Most small companies use a calendar tax year and never consider anything else. The date then travels, gets printed in guides, and turns into a rule. I find that mildly annoying, since the actual instruction is 1 sentence long and would fit on the same poster. Anyway, back to the form itself.

What I could not establish

How many elections are filed late. The tax authority publishes counts of returns, not a breakdown of how many elections arrived under the relief procedure, and I have not found a study that estimates it. My guess is that late is closer to normal than anybody admits, given how the 2 month rule is worded and how rarely it is quoted correctly. I suspect the relief procedure carries more elections than the deadline does, and I would not defend that without numbers.

Whether reasonable cause is applied strictly or loosely. I cannot tell you where the line sits, because the decisions are not published in a form anybody can count. I asked 2 accountants and got the same answer twice, that they had never had one refused, which tells me the bar is low and tells me nothing about where it is.

The detail I keep thinking about is the asymmetry between the 2 clocks, and it is the kind of asymmetry that only shows up when you read the instruction in order rather than searching it for the one answer you came for. The deadline everybody fears runs for 75 days and is repairable for more than 3 years. The shareholder test nobody mentions runs forever and is repairable never. Nobody I asked will say why the repairable one gets the poster and the permanent one gets a numbered line in the middle of an instruction.