Long-duration funds are top-performing debt funds right now. Time to invest?

Long-duration funds have been the best performers in the debt fund space in the last year. Their top-of-the-chart performance hasn't gone unnoticed. Investors have been flocking to this category in recent months. Net inflows over the past four months stand at Rs 4,372 crore, more than the combined inflows of Rs 4,333 crore recorded in the preceding 15 months. In fact, September alone saw net inflows of Rs 1,489 crore, the highest in the last 19 months. New long-duration funds are making their way into the market as well. So far, four NFOs (new fund offers) have been announced in this category this year. Two have already been launched, while the other two— Franklin India Long Duration Fund and Mirae Asset Long Duration Fund —are currently open for subscription. But does the recent surge in returns and investor interest mean you should jump on the bandwagon? Let's understand whether long-duration funds are worth adding to your portfolio. Recent performance Long-duration funds have delivered 11.4 per cent return on average over the past year. But has this category always been a star? Not really. The five-year average return is a modest 6.88 per cent. Over ten years, it's 8.17 per cent. This tells us one thing: the recent stellar performance is more of a hot streak than an all-weather phenomenon. So, what's behind this lucky break? Let's dig in. Reasons for good recent performance Before exploring the reasons, let's first understand the opposite relationship between bond prices and interest rates: When interest rates fall , existing bonds with higher interest rates become highly sought after. Investors flock to these bonds, eager to take advantage of their better returns, which drives up their prices due to the surge in demand. But when interest rates rise , the tables turn. New bonds, offering higher yields, steal the spotlight, making the older bonds with lower rates less attractive. As a result, investors ditch the older bonds and flock to the new ones, creating a sell-off that pushes the prices of the older bonds down. This principle applies to all bonds but is more pronounced