Ahh - Facta. Only applies to US citizens. terrible law may by the US and forced upon the world. Still that info goes to IRS, not NSA so they can enforce their draconian world wide income tax on all Us citizens (while they let corporates wrought the system).
My conspiracy claim refered to suggestions IRD would give info to NSA. Completely agree with your comments. The big data that Xero holds (and MYOB online) would be extremely valuable for doing targeted audits.