Nuveen California AMT-Free Quality Municipal Income Fund is a closed-end fixed income mutual fund, invested in undervalued municipal securities that focus on the California fixed income markets. The fund primarily invests in income which is exempt from regular federal and California income taxes, rated Baa, BBB, or higher with 20.17 years of average maturity. The fund aims to benchmark against the Standard & Poor's (S&P) California Municipal Bond Index and the S&P National Municipal Bond Index, while it employs fundamental analysis with a bottom-up approach to create its portfolio.