Guideline that revenues from facilities financed by municipal bonds should exceed the operating budget plus maintenance costs and debt service by at least 20% to allow for unforeseen expenses.
TWENTY-PERCENT CUSHION RULE
Meaning of TWENTY-PERCENT CUSHION RULE in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012