Hi Peter,
Division of property issues are very complicated and very much dependent on the individual case. There are many factors at play.
However, your income during the period of separation may form part of the shared pool to be divided. Therefore, you should keep an account of how much you are earning, when you receive the pay cheques, and what expenses these cheques are are going towards (mortgage, housekeeping, rates, amenities, dependents etc.)
There are quite a few LawAnswers threads already that look at property division in separation/divorce situations. Some of them include these Family Law Forum threads:
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"Property valuation after separation and divorce"
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"When is my wage mine"
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"De facto - Property issues" (for the links)
What you can do in the meantime, if you want some certainty, is enter into a property settlement agreement with your ex partner and have this turned into a consent order. You should do this as soon as possible. In general, courts will not intervene with agreements that parties agree to, unless it is unfair to third parties. When you divorce, this agreement will be the basis of property/asset division. Otherwise, the default position is that (almost) everything up until divorce and court order falls into the "shared pool" of assets.