I would advise you to be very pedantic regarding base costs when switching your portfolio as it could significant implications when dealing with SARS on issues of CGT. Also I have a view that the receiving broker should record the original date on which you purchased the counters as the transfer from present to future broker is nothing more than an electronic transfer of counter volumes and there should be no price movements. When you come to sell a counter there should not be a necessity to convince SARS that you have held the counters longer than the prescribed 3 year period - the burden of proof should not be with you.So once transferred - just check that the new records reflect the reality of when you purchased the counters and that the base figures are reflective of when you purchased them