Municipal Bond Guarantees

The math is straightforward. A municipality with an A-rated credit issues $50 million in 20-year bonds. Without insurance, investors demand 4.50% interest. With AAA insurance wrapping the bonds, investors accept 4.00% because the insurer guarantees payment. That 50 basis point savings amounts to $250,000 per year, or $5 million over the life of the bonds. The insurance premium might cost $200,000-$500,000 upfront, so the net savings is still $4.5-$4.8 million. The lower the underlying credit rating, the greater the savings.

The current active municipal bond insurers are Assured Guaranty (the largest, formed from MBIA and FSA predecessors), Build America Mutual (BAM, a mutual insurer owned by its member municipalities), and National Public Finance Guarantee (a subsidiary of MBIA). Before the 2008 financial crisis, AMBAC, FGIC, and several others were also active. The market has consolidated significantly, but remaining players are well-capitalized and maintain strong credit ratings.

Yes. Municipal bond insurers paid hundreds of millions in claims during and after the Detroit bankruptcy (2013-2014), the Puerto Rico debt crisis ($70+ billion in outstanding obligations), and numerous smaller municipal defaults. Assured Guaranty alone has paid billions in claims across its portfolio. The industry survived, but the financial crisis and these defaults drove several legacy insurers into runoff. Today active insurers maintain significantly stronger capital positions and more conservative underwriting standards.

The sweet spot is A and BBB-rated issuers, where the enhancement to AAA produces the largest interest savings relative to the insurance premium. AA-rated issuers still benefit in volatile markets or for complex credits. AAA-rated issuers obviously gain nothing from insurance. Below investment grade (below BBB-) insurers typically will not provide coverage. The key metric is whether the insurance premium is less than the present value of interest savings over the bond life.

From initial submission to commitment letter, expect 4-8 weeks. The insurer reviews 3-5 years of audited financial statements, revenue and expenditure trends, debt burden and debt service coverage, economic base and demographics, legal security structure of the bonds, and management quality and governance. For repeat issuers with prior relationships, the process moves faster. First-time applicants take longer because the insurer is building a credit file from scratch.