IRS says I should have been W2 not 1099 - now I owe $18K in back taxes??

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Illustrative scenario prepared by my practice.
For informational purposes only. Not legal advice.
Hypothetical question

I'm freaking out. Just got a letter from the IRS saying I was misclassified as a 1099 contractor when I should have been a W2 employee for the past 3 years. They're saying I owe $18,000 in back taxes, penalties, and interest.

Background: I worked for a marketing agency from 2022-2024 as a "contractor." I got 1099s every year and paid my self-employment taxes. But I worked 40 hours/week, only for them, used their equipment, worked their required hours, had to get approval for time off, etc. Basically I was an employee in everything but name.

I left the job in May 2025 and I guess someone (maybe another contractor?) filed a complaint with the IRS about the company misclassifying workers.

The IRS letter says I need to pay the back taxes by November 15 or they'll start collection proceedings. But I already PAID self-employment tax on all that income! How can they make me pay again? Is this even legal?

Illustrative response

I went through this exact situation last year with the California EDD (state version of IRS misclassification audit). Here's what happened:

1. Got scary letter saying I owed $22K in back taxes

Don't try to handle this yourself. The IRS won't help you figure out their own mistake - you need professional representation fwiw.

Illustrative response

Has anyone tried [reaching out to their legal department directly]?

Illustrative response

This is exactly why I started documenting everything from day one.

Illustrative response

Keep records for at least 7 years. The IRS can audit further back in some cases.