There is no mention of tax on any of the interest gained when calculating the compound gains. I think he would be extremely lucky to average 6% if he kept it a

There is no mention of tax on any of the interest gained when calculating the compound gains. I think he would be extremely lucky to average 6% if he kept it all in savings accounts: http://swanlowpark.co.uk/savingsinterestannual.jsp http://swanlowpark.co.uk/savingsinterestannual.jsp Regarding stocks + shares: "For most of the past century, anyone investing for a 30-year period has been rewarded with a return in excess of inflation of between 4pc and 8pc a year if they were sensible about re-investing the dividend income from their holdings." http://www.telegraph.co.uk/finance/comment/tom-stevenson/8469660/What-history-tells-us-about-returns-over-the-next-30-years.html http://www.telegraph.co.uk/finance/comment/tom-stevenson/846... (just from a quick search) You then take into account management fees, tax, relative currency value etc.