Stephen FoleyJul 15, 2026 – 5.26pmSan Francisco | Tech entrepreneurs and investors who claim to have left California to avoid a proposed “billionaire tax” should expect an intrusive residency audit to test whether they still have to pay the 5 per cent levy.The cadre of self-declared émigrés led by Google co-founder Sergey Brin could be forced to pay billions if they cannot prove they really established a new home outside the state, according to independent financial advisers and proponents of the wealth tax.Financial TimesSubscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles