A year and a half ago, I wrote about my surefire tax estimation system for freelancers for the Billfold, in the hopes that a system that has worked for me would help the many Billfold readers who live partly or entirely on freelance income avoid quarterly or annual financial panic when it came to dealing with their taxes. "This system is incredibly useful!" some said. "This system is insanely complex, how can you expect anyone to actually do this," said many others. "Please help me," said an unsettling number of emails I've received.