High on the list of investor fears heading into 2016 is a “rising rate” environment. Déjà vu indeed. This has been a concern among investors for years now. With the Federal Reserve increasing interest rates this month for the first time since 2006, these fears have only been exacerbated.

When it comes to investing in bonds, are these fears warranted?

At first blush, they would seem to be. As bond prices move in the opposite direction to interest rates, rising rates can be a short-term headwind for bond returns. As we will soon see, though, the key to this sentence is short-term. Over longer-term time frames, it is the level of interest rates, not their direction,that is the most important driver of returns.

We have total return data on the Barclays Aggregate US Bond Index going back to 1976. Since then, bonds have experienced only 3 down years: 1994, 1999, and 2013. In each of these years interest rates rose: 239 basis points (2.39%) in 1994, 151 basis points in 1999, and 74 basis points in 2013.

(Note: the worst year for bonds was -2.92%, incredible when you consider that the fear of bonds today exceeds the fear of stocks).

While certainly a factor over a 1-year time frame, when we look at longer-term returns the direction of interest rates becomes less and less important. The most important driver of long-term bond returns is the beginning yield. Why? Simply stated: when bonds approach maturity, they move closer to their par value and the short-term gains or losses from interest rate moves disappear. What you are left with, then, is the compounded return from the starting yield and reinvestment of interest.

The relationship is immediately clear when viewing the chart below which displays starting yields by decile (lowest decile = lowest starting yield) and actual forward returns. The higher the starting yield, the higher the forward return and vice versa.

The close relationship between beginning yield and future return has persisted throughout time. While rising rates can be challenging for bond holders over short-term periods, they are a positive for investors over longer periods as interest payments and maturing bonds are reinvested at higher yields.