Of everything in the collection arsenal, the trust fund recovery penalty is the one that ruins people who thought they were protected. The rule: taxes withheld from employee paychecks are trust funds belonging to the government, and when a business fails to pay them over, the IRS can assess that portion personally against every responsible person who willfully let it happen.
Personally means personally. The corporate shield is irrelevant. The assessment follows you after the business dies, and it is not dischargeable in bankruptcy.
Responsible and Willful
Two elements have to exist, and both are fact fights. Responsibility is about authority: who could sign checks, hire and fire, decide which creditors got paid. Titles matter less than function - I have seen the test reach bookkeepers and office managers, and I have seen owners escape it where someone else genuinely controlled the money.
Willfulness does not require bad intent. Paying any other creditor - rent, suppliers, even net payroll - while knowing the withholding is unpaid is willfulness in the IRS's book. That standard catches nearly everyone who knew about the problem, which is why the fight is usually about responsibility and timing: when did this person know, and what authority did they actually have during the unpaid quarters.
The Interview That Decides the Case
The IRS builds these assessments through Form 4180 interviews, conducted by a revenue officer with each potentially responsible person. The questions are scripted to establish both elements out of your own mouth, and people walking in unprepared routinely assess themselves. You are entitled to representation at that interview, and preparation for it is the single highest-leverage hour in the entire case.
After a proposed assessment, there is an appeal window. After assessment, the usual collection defenses apply, and one quirk works in your favor: the IRS can assess multiple people for the same trust fund debt but only collect it once, so payments by the company or by other responsible persons reduce what it can take from you.
If This Is Heading Your Way
If a revenue officer is asking about your role at a business with payroll debt, or a 4180 interview is on the calendar, the time to get counsel is before you answer anything. The statements made in week one shape the next ten years. Call me first.