Fixed-income investors have traditionally taken up municipal bonds and related exchange traded funds to gain exposure to relatively safe, tax free, income-generating debt securities. However, munis still come with their own risks.

Bond ETF investors have looked to muni bond options like iShares National AMT-Free Muni Bond ETF (NYSEArca:MUB)SPDR Nuveen Bloomberg Barclays Municipal Bond ETF (NYSEArca:TFI) and VanEck Vectors AMT-Free Intermediate Municipal Index ETF (NYSEArca:ITM) to diversify their fixed-income portfolios with a tax-exempt offering that produce relatively attractive yields for investment-grade debt exposure.

However, some shake ups in the munis market have been a cause for concern. For instance, Puerto Rico declared its own form of bankruptcy, and now, Illinois had its bond rating downgraded by both Moody’s and S&P to one notch above junk, and it sports the lowest ranking on record for a U.S. state.

Illinois has gotten to where it is now after failing to implement a budget that addresses the government’s long standing deficits. The state has suffered through underfunded pensions and unpaid bills that equal roughly 40% of its operating budget, according to Madison.

If Illinois fails to shore up its finances and winds up with a speculative-grade debt status, it could drag down the whole market, leaving investors with limited liquidity and exposing many to potential losses.

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