April showers are supposed to bring May flowers, but for bond funds, a poor April performance may just be a springboard to a yearlong outflow.

Even though the Federal Reserve decided Wednesday not to touch its benchmark rate, expectations of an interest rate hike in the near future are causing investors to shy away from bond funds in a major way, The Wall Street Journal reports. In April alone, Vanguard suffered a whopping $500 million in bond fund withdrawals.

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