In 2006-2007 I was a shareholder in a company and filed a K1. The company never filed the correct forms to be an S corporation. They sent me a notice stating that I need to refile for these tax years as my K1 is null and void. 2006 yielded a profit, 2007 yielded a loss. The difference in my taxable income is less than 25% each year. Should I refile, or have I passed the statute of limitations and leave it alone?