The following is a quote from the Australian Tax office...
"Foreign exchange (forex) measures bring to account foreign currency gains and losses as assessable income or allowable deductions, on a realisation basis, to the extent such gains or losses are attributable to a fluctuation in a currency exchange rate, or to an agreed exchange rate differing from an actual exchange rate. The measures apply to all taxpayers, except for, broadly, banks and similar financial institutions.
Foreign exchange (forex) measures bring to account foreign currency gains and losses as
assessable income or allowable deductions, on a realisation basis, to the extent such gains or losses are attributable to a fluctuation in a currency exchange rate, or to an agreed exchange rate differing from an actual exchange rate.
The measures apply to all taxpayers, except for, broadly, banks and similar financial institutions."
I believe the activities your wife engages in fall under the classification of "hedging transaction" as described in the Common Transactions section.
Forex taxation by the ATOAlways check with your tax professional for information to your specific situation.
Cheers
Marilyn
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