💭 Forming a Corporation Doesn’t Make You an S-Corp — A Cautious Entrepreneur’s Story
Hello, I’m the “Timid Entrepreneur.”
(And trust me — when it comes to the tax code, I stay humble too.)
After years of helping countless new business owners with tax consultations, I’ve seen one mistake over and over again — a mistake that’s both common and costly.
It’s the belief that “once you form a corporation and get an EIN, you’re automatically an S-Corp.”
Many founders, full of excitement, set up their corporations, apply for their EIN from the IRS, and breathe a sigh of relief:
“Great! We’re an S-Corp now — tax savings, here we come!”
But let me give you one of the most important warnings I can:
If you did nothing else, your corporation is NOT an S-Corp — it’s a C-Corp by default.
The Biggest Misunderstanding: EIN ≠ S-Corp Election
Here’s what I hear all the time during consultations:
“Didn’t I already choose my tax structure when I applied for the EIN?”
“I thought the formation service automatically made my business an S-Corp.”
Let me be very clear: No, it did not.
EIN (Employer Identification Number) — This is like a Social Security Number for your business.
It identifies your entity to the IRS, but it does not determine how you’ll be taxed.Incorporation — Filing your articles with the state gives you a legal entity, but tax-wise, the IRS treats it as a C-Corporation by default.
Those two steps alone will never make you an S-Corp.
The 75-Day Rule That Everyone Misses
To change your tax classification to S-Corp, you must file one specific form: Form 2553.
Here’s the catch — it has a strict deadline.
You must file it within 2 months and 15 days (about 75 days) of your incorporation date or the start of your tax year.
Most entrepreneurs miss this.
They’re too busy setting up the business, opening bank accounts, and finding their first clients.
Taxes can wait — until suddenly, they can’t.
Months later, while preparing their first tax return, they realize something’s off.
“Wait… we’re not an S-Corp?”
That’s the moment when both of us start sweating.
Because by then, it’s already too late.
Once you miss that 75-day window, you’ll have to go through the Late Election process — and sometimes, you can’t retroactively apply your S-Corp status for that tax year.
I’ve helped clients through that process many times.
It’s possible, but it’s never fun.
Every time, I think, “If only they’d known earlier…”
A Final Word
Starting a business is hard.
There’s always too much to do, and taxes often feel like something you’ll figure out “later.”
But if you remember only one thing, let it be this:
Your EIN is just your ID — Form 2553 is what defines your tax identity.
That one piece of paper can shape your tax situation for years to come.
I’ve seen it too many times not to say something.
So from one cautious entrepreneur to another:
If you do nothing, you’re automatically a C-Corp. Don’t let that surprise you next April.