TSC Ratings provides exclusive stock, ETF and mutual fund ratings and commentary based on award-winning, proprietary tools. Its "safety first" approach to investing aims to reduce risk while seeking solid outperformance on a total return basis.As predictions grow that the economy has bottomed out, it may not be too early to move some money into inflation-indexed bond mutual funds. Despite the assurances of Treasury Secretary Timothy Geitner, trillions of dollars -- from new bonds to stimulus money -- flowing into the economy has some investors predicting a return to rampant inflation. TheStreet.com Ratings' model recommends holding three mutual funds hoarding inflation-indexed bonds that ranked in the 25 best-performing fixed-income funds in March. Two other fixed-income funds that invest in zero-coupon U.S. Treasury securities and one global bond fund also scored well. The three fixed-income funds that invest in portfolios of Treasury Inflation-Protected Securities, or TIPS, are the Harbor Real Return Fund ( HARRX), up 6.6% in March; the American Independence US Inflation-Indexed Portfolio ( FFIHX), up 6.4%; and the Vanguard Inflation-Protected Securities Fund ( VIPSX), up 6%. The two zero-coupon bond funds are both American Century funds. The American Century Target Maturities Trust Series 2020 ( BTTTX) rose 6.3%, while the American Century Target Maturities Trust Series 2025 Fund ( BTTRX) gained 6.1%. Both funds earned a rating of "C," or "hold," by our fixed-income fund model. The other noteworthy fund, Templeton Global Bond Fund/United States ( TPINX) predominantly invests in the government debt of countries around the world, including Indonesia, at 12.1%, South Korea, at 11.8%, Mexico, at 10.8%, and the rest in Russia and the U.S.