A rainy day or rainy day fund is a reserved amount of money to be used in times when regular income is disrupted or decreased in order for typical operations to continue. In the United States, the term is usually used to apply to the funds maintained by most U.S. states to help deal with budget shortfalls in years where revenues do not match expenditures. This is critical to the operations of most states, which do not permit their governments to take on debt, meaning that services would have to be cut in the absence of reserve funds. 
New York State Comptroller Thomas DiNapoli recommended in March 2010 that the state require that one half of surpluses be deposited into the rainy day fund.  The Massachusetts rainy day fund has been the focus of tussles between the Governor of Massachusetts and the Massachusetts General Court.   Some research suggests developing a national rainy day fund for states might improve state credit ratings and reduce capital financing costs for states.  
- Rueben, Kim. "What are rainy day funds?". Brookings Institution. Retrieved 2009-03-27.
- "DiNapoli wants to alter budget process", Business First of Buffalo and The Albany Business Review, March 9, 2010.
- "Gov. Withholds $425 Million in State Spending". WCVB-TV. Archived from the original on September 27, 2007. Retrieved December 7, 2006.
- Carroll, Matt (January 7, 2007). "Patrick's reversal of cuts brings joy". The Boston Globe.
- "Creating a National State Rainy Day Fund", Federal Reserve Bank of Chicago, 2003.
- "Rainy Day Funds and State Credit Ratings" (PDF). Pew Charitable Trusts. May 18, 2017. pp. 10–12. Retrieved 8 December 2018.
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