Live: Will Ross Crush Q2 Earnings Tonight After Its Record Q1? Your Muni Income Is Invisible to One Tax Break and Fatal to Another By Ryne Mauck Published Aug 20, 5:15PM EDT Your Muni Income Is Invisible to One Tax Break and Fatal to Another - 24/7 Wall St. How to Add Us to Google News Sending You to Google News in 3 If you own the iShares National Muni Bond ETF (NYSEARCA:MUB), you likely bought it for one reason: federally tax-exempt income at a rock-bottom price. MUB is the largest broad national muni ETF ...