If you build a mini business empire and it subsequently fails, a small consolation prize might be a net operating loss carryover that will shelter some or all of your more modest income for many years. Of course NOLs are only one among many carryovers that need tracking. In my experience the tracking often leaves much to be desired. Changes in tax preparers or even software can result in the loss of valuable carryovers. But that is not the worst of it...
Kovel: Attorney-Client Privilege for Tax Professionals
Twice in my four-decade career, two special agents from IRS Criminal Investigation (CI) entered my office armed with a search warrant, firearms at their side. In both cases, it started the same way.