04/03/2026
FYI.
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What does Form 3115 do?
You file Form 3115 when you want to change an accounting method.
That’s fine. That’s the headline.
But that’s not where the action is.
The real question is: where does the actual impact show up?
One line: §481(a).
That’s the whole game.
Here’s what’s actually going on.
Every accounting method is just a timing system.
Cash = when money moves
Accrual = when it’s earned or incurred
When you switch methods, you’re changing timing… but you’ve already filed prior years.
So now you’ve got a mess.
Some income got picked up too early.
Some expenses too late.
Some stuff is missing entirely under the new method.
That gap doesn’t just disappear.
§481(a) measures it.
Simple question:
“If we had always used the new method, where would we be right now?”
Then it takes that difference and forces you to deal with it:
• If it’s favorable → you take it now
• If it’s unfavorable → usually spread over 4 years
Think of it like this:
Your books have been off for years.
You fix the system.
You don’t go back and amend everything.
You book one adjustment to get to the right number today.
That’s §481(a).
Now let’s talk about what actually matters.
People worry about “risk” with 3115.
That’s not the risk.
The risk is screwing up the adjustment.
Here’s where people blow it:
• Missing balance sheet items (AR, AP, inventory, prepaids, etc.)
• Double counting stuff already picked up
• Mixing up timing vs permanent differences
• Getting the spread wrong
• Not actually understanding the old method
This isn’t a plug.
It’s a full cleanup of timing across years.
So in plain English:
Form 3115:
• Gets you permission
• Explains what you’re changing
§481(a):
• Fixes everything you did under the old method so the new one actually works
Other forms show the numbers.
This is what makes the numbers right.
IRS source:
https://lnkd.in/duUf2fU
