Fifteen per cent? It’s like a flashback to my childhood!
To be honest, I have to say: it makes a nice change to have progressive taxation for once. Taking taxation off a flat-rate tax and onto an income-dependent one is a pleasant change: the people who have the money should be taxed on it. The fairest tax of all would be on disposable income; it would, sadly, be entirely impractical and unenforceable.