He’s a self-described money manager for the ultra-rich, with a penchant for pricey champagne and a personal wealth in the eight figures.

But Charles Shaker also has a penchant for not paying his taxes, the Canada Revenue Agency (CRA) claims. And thanks to a lack of transparency — in tax havens but also in Canada — around who owns certain kinds of assets, it’s proving hard for the CRA to do anything about it.

Shaker, a British-Canadian financial adviser, made tabloid headlines in 2013 when he ordered a $500,000 round of choice bubbly for revellers at a Formula One party in