How much surplus revenue can a nonprofit organization maintain in its treasury?
For a federally tax-exempt nonprofit, there is no limit on the amount a nonprofit can maintain in its treasury. Unlike a business which could at least theoretically be taxed on excess reserves, the Tax Code provides neither limits nor tax on the amount.
We are not aware of any state limitations on the amount, so long as the funds are used for the purpose of the organization.
A huge surplus may make it more difficult to raise funds, but remember that Harvard University had an endowment of more than $30 billion in 2013 and they seem to convince donors to give more each year.