Currency Gains/Loss treatment for Share traders

[Jay]

You could put the question to IRD themselves - can do it without naming names I think
Can't remember if it was someone on here or an accountant once told me that not unless your Fx has over a certain amount - quite high may have been $100K or more??? before you have to worry about 'declaring" transfers of "cash" transactions only. As you say you change all your trades back to NZD, the same as I do with any ASX trades, the profit/loss converted to NZD.

May be different if trading under a company structure