In brief, my passive income from book royalties will more than cowl my bills. Joe started Retire by 40 in 2010 to determine tips on how to retire early. After 16 years of investing and saving, he achieved financial independence and retired at 38. Is it potential to fund your retirement with passive income? It’ll undoubtedly be simpler once social safety kicks in, however that’s now not early retirement. Annuities – An annuity is a sort of insurance.