Welcome asuasylum -
It depends how often you make transfers and somewhat on how large your balance is.
If you make a couple of month it probably won't make a big difference particularly if you have a decent balance since every time you make an IFT your entire balance gets re-allocated.
The bigger your balance, the less of an impact your new money's returns have on your total return, and if you make a couple of transfers a month, the difference may be close to negligible.
If you rarely make changes it might be better to keep them both the same.
But, you can always do both every time you make an IFT if you want to make sure your new money follows the allocation of your old.
Good luck!
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