What does a fiscal sponsor do?
The role of the fiscal sponsor can include performing many different administrative functions on behalf of the sponsored organization or program, including taking on the responsibility of receiving and administering charitable contributions on behalf of the sponsored organization. Some fiscal sponsors do a lot more, such as performing back-office functions.
The fiscal sponsor charges an administrative fee for its services, which is usually a percentage of the budget of the sponsored organization or program. Using a fiscal sponsor satisfies IRS requirements as long as the fiscal sponsor maintains the right to decide, at its own discretion, how it will use contributions. Maintaining control over the donated funds is a requirement of a legitimate fiscal sponsor arrangement. (Source: National Council of Nonprofits)