Let me lower the temperature first: the overwhelming majority of IRS problems are civil. Owing money is not a crime. Filing late is not a crime. Even years of unfiled returns usually resolve civilly. The IRS pursues a few thousand criminal cases a year out of tens of millions of delinquent accounts.
But the cases that do go criminal share patterns, and the worst outcomes happen to people who did not recognize the pattern until they had already talked too much.
The Warning Signs
An audit that suddenly goes quiet can mean a referral to Criminal Investigation. An auditor who starts asking about intent - why you did something, what you knew and when - is asking criminal-law questions. Two people showing up with credentials that say 'Special Agent' is not an audit at all; that is a criminal investigation, and anything you say to them is evidence.
Subject matter raises the stakes too. Unreported cash income, false documents, offshore accounts that were deliberately hidden, payroll taxes that were withheld from employees and spent - these are the fact patterns prosecutors like, because intent is easier to show.
Why You Start With a Tax Attorney
Here is the structural point that surprises people: communications with your accountant are generally not privileged in criminal matters. The IRS can summon your CPA and compel testimony about everything you told them. Attorney-client privilege is different. What you tell a lawyer stays with the lawyer, and when accounting work is needed, the attorney can engage the accountant under what is called a Kovel arrangement so the work stays protected.
I spent my early career as a public defender before three decades of federal tax practice. I know how investigators build cases and how charging decisions get made. That background shapes everything about how I handle a civil case with criminal undertones: fix the compliance, control the communications, and never hand the government a statement it did not already have.
The Path Back to Civil
The goal in nearly every one of these cases is to keep it civil or return it there. Voluntary compliance before detection is powerful. Filing accurate delinquent returns, correcting false ones through proper channels, and using disclosure programs where they fit can take the criminal question off the table entirely.
If anything in your situation has you reading this article closely, do not discuss it with the IRS, your bank, or your accountant first. Call a tax attorney. The consultation is privileged, and it is free.