GE: 7,000 tax returns, $0 U.S. tax bill - Apr. 16, 2010
In 2006, as the IRS ramped up its corporate e-filing program, the tax agency actually issued a celebratory press release when it processed GE's tax return. On paper, the return -- the nation's largest -- would have totaled a massive 24,000 pages. But instead, the IRS was able to upload the 237 MB document in under an hour.
Reading it, though, is apparently taking a bit longer. The IRS is currently auditing GE's tax returns for 2003-2007.