They bring you to court and demand you give them the money, if you don’t they’ll seize any property you may have to account for it, or they’ll just garnish your wages.
Discussion
Yet another reason to not be a wage slave and to put your assets into trusts owned by LLC companies. There are ways, but also ways for motivated entities and agencies to pierce the veil of privacy. It’s a matter of making discovery effortful, expensive, and difficult.