The biggest mistake investors make during elections could cost you up to 57% over 20 years, according to the head of fixed income at UBS. Here’s how to avoid it

• Investors tend to reduce their concentration in equities when their preferred candidate doesn’t win.
• Be wary of rebalancing your portfolio in reaction to election results, says Tom McLoughlin.
• Doing so could reduce your cumulative returns by 57% over two decades. 

Vote through the ballot box, not through your portfolio.