Tax treatment for bond funds ultimately depends on their underlying holdings, with municipal bonds being the most efficient.

Muni bonds serve up income that's free from federal (and sometimes state and local) taxes. Here are 9 top municipal bond funds to check out.

Which mutual funds should you buy? If you want the best municipal bond funds, here are 55 that beat the benchmark in four time periods.

Check out the best tax-free municipal bonds currently available and see if this type of investment is right for you.