Low interest rates and the recent stock market surge make this a challenging time to find the best places for your extra cash.
Are you a high earner worried about tax hikes? Anyone in the 28% federal bracket or above can benefit from putting $10,000 into a municipal bond fund such as Fidelity Intermediate Municipal Income (FLTMX). Its 3.6% yield becomes an effective 5% for someone in that bracket -- beating the 4.5% paid by Fidelity's regular intermediate-term bond fund.
If you live in a high-tax state, you may do better with a muni fund that holds only bonds from your state; you'll owe no federal or state tax. (To figure your effective yield, use the calculator at investinginbonds.com; click Learn, then Municipal Bonds.)
NEXT: Protect your portfolio against inflation