Which tax-efficient account could get you to the magic million faster? : To stand a chance of making a million on the market, it's a no brainer that you should be holding your investments within a tax-efficient wrapper such as a Stocks and Shares Individual Savings Account (ISA) and a Self-Invested Personal Pension (SIPP). Both save you from paying any capital gains tax on the profits you make or any income tax on dividends you receive. But does it makes sense to say that one might get you to millionaire status first? In theory, yes.