I had the same experience - settled a PI case for a good amount of money. Client was not a "sovereign citizen" but someone who neglected to tell me that he had a $237,000.00 child support lien haha - well at least the kids finally get paid, but he does not.I had a client in a personal injury case who was a so called "Sovereign citizen." His case settled for a nice amount. The insurance company reported the settlement and the plaintiff's name/SSN to the Massachusetts Department or Revue. DOR checked to see if the party had any unpaid child support and unpaid taxes that were owed. Then I received a Tax Intercept letter informing me that my client "Mr. Sovereign Citizen" owes unpaid taxes of $257,000. I called the client and asked do you have proof you have been paying your taxes in recent years? He responds no, I stopped paying taxes a few years ago because I'm a "Sovereign citizen." When I explained, the situation of course he asked "What are my rights?" Well, basically he can either provide proof he paid his taxes and we submit the proof, or he can't in which case the government will be taking all of his settlement proceeds less our attorneys fees and expenses. Suddenly he wished he had paid his taxes!