Equation is simple. At 3340 for the CFD, OST charges a 0.04% commision with a minimum of R45 (sorry if the charges are not correct - I think this is what it is). So to keep the 0.04% comms, you need to buy 34 shares (less than that, and your comms grows bigger than 0.04%). so for 0.04% on the buy, and again on the sell, you need to make 0.08% growth. Actually, it is a bit more, 0.09% because of the increased comms on the sell side. Lastly, you need to factor in the interest charge. Interest is charged at JBAR + x on your total exposure. So the longer you hold, and the more your stock grows, the bigger your breakeven point gets. With SSF's, the calculation is more complex, because the interest is already factored into the contract. But OST has a very useful spreadsheet somewhere in the help section for working out hte costs.