XB said:This thread has more details and a link to the relevant publication
Thanks - forgot about that thread, knew I had written about it somewhere.
There is a double whammy - to quote from that thread, "You can actually receive less superannuation overall by salary sacrificing, in addition to reducing your salary".
Employer counts your salary sacrifice towards the 9%, and the 9% gets calculated on the reduced salary after the salary sacrifice bit is deducted. This happened at a former workplace of mine (plus the employer was making contributions very late).
Key thing when salary sacrificing is to GET IN WRITING that your contribution is in addition to the employers current contribution, and that the employer's contribution is not calculated on the post-sacrifice earnings.