The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. The Morningstar Rating™ for funds, or 'star rating', is calculated for managed products (including mutual funds and exchange-traded funds) with at least a three-year history. Morningstar Muni National Interm Category 6 The Fund may engage in other investment practices that may involve additional risks and you should review the Fund prospectus for a complete description. No fund is a complete investment program and you may lose money investing in a fund. The impact of the coronavirus on global markets could last for an extended period and could adversely affect the Fund’s performance. The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Investing primarily in responsible investments carries the risk that, under certain market conditions, the Fund may underperform funds that do not utilize a responsible investment strategy. Because the Fund may invest significantly in a particular geographic region or country, value of Fund shares may fluctuate more than a fund with less exposure to such areas. Because the Fund investments may invest significantly in a particular sector, the Fund share value may fluctuate more than a fund with less exposure to such sector. Investments rated below investment grade (sometimes referred to as 'junk') are typically subject to greater price volatility and illiquidity than higher rated investments. The value of income securities also may decline because of real or perceived concerns about the issuer's ability to make principal and interest payments. Investments in debt instruments may be affected by changes in the creditworthiness of the issuer and are subject to the risk of non-payment of principal and interest. As interest rates rise, the value of certain income investments is likely to decline. There generally is limited public information about municipal issuers. The value of investments held by the Fund may increase or decrease in response to economic, and financial events (whether real, expected or perceived) in the U.S. If adjusted for other expenses, returns would be lower. Prior returns are adjusted to reflect applicable sales charge (but were not adjusted for other expenses). Total return prior to the commencement of the class reflects returns of another Fund class.

Performance prior to Decemreflects the performance of the Fund’s former adviser, Calvert Investment Management, Inc. Performance less than or equal to one year is cumulative. Returns for other classes of shares offered by the Fund are different. Returns are historical and are calculated by determining the percentage change in net asset value (NAV) with all distributions reinvested. Performance is for the stated time period only due to market volatility, the Fund’s current performance may be lower or higher than quoted. Investment return and principal value will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Past performance is no guarantee of future results.

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