A soon-to-be released report by the John F. Kennedy School of Government says that recent credit rating upgrades in Massachusetts have saved taxpayers more than $540 million in interest cost savings.

The $540 million figure represents the calculated gross savings caused by the upgrade. The report says that the state has saved $362 million in present-value debt service savings over the past three years and an additional $178 million in other savings attributable to the better ratings.

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