Generating a seven-figure retirement savings nest egg may be easier with a Lifetime ISA, in my opinion. : For many people, retiring with a £1m nest egg would be viewed as a successful scenario. Assuming a retiree takes a 4% income from their portfolio, this could provide a £40,000 annual income, which is almost five times higher than the State Pension. However, achieving a goal of a seven-figure retirement portfolio without investing in the stock market could prove challenging.