A Texas contractor wins a hospital expansion in Oklahoma, then adds subcontractors in Louisiana and materials from Arkansas. Six months later, a multi-state tax audit hits: $127,000 in penalties, back taxes, and professional fees. This isn't rare. It happens to construction companies every year. Cross a state line and you have multi-state tax obligations whether you know it or not. The rules vary wildly between jurisdictions, and most contractors rely on general accountants w