Image source: Getty Images There’s an estimated 10,000 Stocks and Shares ISA millionaires in the UK. There may be more, there may be less. But out of the millions of adults who hold an ISA, I don’t think that’s a lot. Now consider this: if you want to generate a genuinely life-changing passive income from your Stocks and Shares ISA — enough to actually live on, cover your bills, and stop trading your time for money — you probably need somewhere in the region of £1m in there.