So it would seem the ATO is to blame - https://www.solarquotes.com.au/blog/why-are-solar-owners-charged-gst-on-money-they-never-spent/ That said we do not have to include the solar feed-in tariff as income - https://www.solarchoice.net.au/blog/tax-implications-of-going-solar/. Swings and roundabouts? Jon