The Nuveen Municipal Credit Income Fund (NZF) functions as a closed-end mutual fund that concentrates on fixed-income investments, established by Nuveen Investments, Inc. Its oversight is a joint effort between Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. The fund primarily allocates its capital within the fixed income markets of the United States. Its strategy involves identifying and acquiring undervalued municipal debt instruments and related investments, specifically chosen for their ability to provide income exempt from standard federal income taxes. The fund targets investment-grade securities, requiring a rating of Baa/BBB or better, and aims for an approximate average maturity of 18 years. Portfolio creation is guided by a bottom-up security selection method, supported by thorough fundamental analysis. The performance of its portfolio is evaluated against the Standard & Poor's (S&P) National Municipal Bond Index. Formerly, this fund was known as the Nuveen Enhanced Municipal Credit Opportunities Fund. It was founded in the United States on March 21, 2001.