A default fund is where your savings are automatically invested when you join a workplace pension scheme. Nest, one of the UK’s biggest workplace pension providers serving almost 14 million members, said 99% of its members are in a default fund. Small decisions today can make a big difference to your tomorrow.”Should you switch out of your default fund? Forgetfulness or inertia: If you switch out of your default fund, you need to remember to continually review your investments as your circumstances change. The least successful pension saver was ‘Cautious Connor’, who invested in a money market fund and only managed to generate a pot worth £182,371.