Shareholders in an investment fund are only taxed when these shares are redeemed. A positive or negative yield is generated at this time that, for tax purposes, is regarded as a capital gain or loss, and as such is added to the savings tax base on your tax return. However, one of the major tax advantages of investment funds is that transfers between funds are tax exempt. In other words, if you move your investment from one fund to another, you do not have to pay any tax on the earnings obtained up until that date (referred to as unrealized gains).