These errors can jack up tax--and opportunity--costs.
UPDATE: 5 reasons to be a contrarian and buy Russian stocks
UPDATE: Protect yourself from tax identity theft
Fed's Yellen Fretted Over Weak Recovery in 2009, Transcripts Show--5th Update
UPDATE: What to do if your 1099 should have been a W-2
Qatar Airways Considers Buying More Shares in IAG, Other Carriers