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5 things investors need to know about Ginnie Mae funds

Investors continue to place an unusually high premium on safety. How else to explain the record low yields they’re willing to accept for lending to Uncle Sam?

The rate on the 10-year Treasury note sank as low as 1.39 percent this week. That’s paltry payback for locking up their money for a decade.

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Investors can earn significantly more by taking on just a bit more risk. Yields of mutual funds that specialize in government-backed mortgage bonds known as Ginnie Maes are currently more than double those of Treasurys maturing over a similar number of years. Several such funds are generating yields exceeding 3 percent.

These funds invest in pools of home mortgages that carry the explicit guarantee of the Government National Mortgage Association, or Ginnie Mae. Investors in Ginnie Mae bonds are ensured full and timely payment of principal and interest, regardless of whether borrowers make payments.

‘‘If you’re conservative, and looking for that steady diet of payments, Ginnie Mae funds can be a great option,’’ says Jeff Tjornehoj, an analyst with Lipper Inc.

It’s decent income for risk-averse investors who may appreciate the monthly cash distributions they can elect to receive from their fund’s returns. Funds specializing in Ginnie Maes attracted more than $7 billion in new cash over the last 12 months, according to Lipper.

The 15 funds in the category have posted an average total return of 5 percent over the last 12 months.

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But the category’s recent solid performance doesn’t necessarily mean that Ginnie Mae funds will be a good fit. Here are five key considerations:

1. Steady returns: Expect smoother returns than you’ll get from higher-risk segments of the bond market. For example, in 2008, the Vanguard GNMA fund returned 7 percent, as Ginnie Maes offered safety during the financial crisis. Compare that with the 2008 losses averaging 26 percent for funds specializing in high-yield corporate bonds.

2. Not all are alike: These funds are required to invest at least 80 percent of fund assets in Ginnie Mae bonds. But managers have leeway with the other 20 percent. Non-GNMA mortgage investments can be found in their portfolios, as well as other government bonds such as Treasurys. So returns can vary significantly from fund to fund.

3. Prepayment risk: One unique aspect of Ginnie Maes makes them slightly riskier than other government-guaranteed bonds. Declining interest rates means many homeowners are trying to refinance to less expensive mortgages, creating ‘‘prepayment risk’’ for Ginnie Mae funds. When refinancing activity spikes, some of the higher-rate mortgages in Ginnie Mae funds are replaced by lower-rate mortgages. That squeezes the interest payments that a fund’s bond portfolio earns, and returns can fall.

Typically, fund managers discuss their strategies for dealing with prepayment risk in quarterly commentaries sent to investors. Gary Greenberg, comanager of Payden GNMA, says the smaller-than-expected number of mortgages refinanced through the Obama administration’s anti-foreclosure programs has been a positive for Ginnie Mae investors.

4. Rate risk: Just like those owning other types of bonds, Ginnie Mae investors could see returns shrink if interest rates rise. Market values for mortgage investments bought when rates were lower would drop as investors seek higher returns from newer mortgages paying higher rates.

Investors wishing to protect against this risk should check disclosures listing a fund’s duration, a measure of vulnerability to rising rates. Most Ginnie Mae funds currently have durations of 2.5 to 4.5. The bigger the number, the more risk an investor faces from a potential rate increase.

5. Costs count: Ginnie Maes typically generate modest returns, and fund expenses can eat up much of what investors earn if they’re not careful. A savvy Ginnie Mae fund manager can sometimes significantly outperform most peers, but the margin is typically smaller than with stock funds and many other bond fund categories. So pay close attention to fees. Vanguard’s Ginnie Mae fund charges the lowest among the group, with an expense ratio of 0.21 percent.

Even without considering costs, Tjornehoj, the Lipper analyst, says there’s plenty to like about these funds.

For starters, there’s Ginnie Maes’ current yield advantage over Treasurys: ‘‘They stack up pretty well, given the low rate environment we’re in and how richly priced the safest assets like Treasurys have become.’’

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