I work for a large fiscal sponsor, and I do not hold a position involved with securing financial sustainability, so I want to be transparent that I am not personally speaking from experience.
However, here are a few things I’ve noticed/a few notes that may be helpful to consider:
• Similar to what Lisa said, the average cost share allocation across fiscal sponsors seems to be around 10% for non-government funds. (Some fiscal sponsors charge up to 14% on government funds, due to the complexity of the grant reporting, etc.)
• Some fiscal sponsors choose to only accept projects that have a certain fund balance. (So a project can’t come onboard without $X from day one, which helps the fiscal sponsor project their income.)
• Similar to above, some fiscal sponsors may require their projects to fundraise (or work towards fundraising) a certain amount during the year (which, again, may help the fiscal sponsor project their income).
• Some fiscal sponsors pass on certain costs to the project which are not covered by the 10% cost allocation. (For example, this could be a certain amount for every project employee to be on payroll or a certain amount towards the project’s “piece” of the insurance coverage, etc).
• I don’t know how to phrase this well, but it seems some fiscal sponsors may encourage their less financially successful projects (and/or projects that aren’t having the desired impact) to close to preserve the fiscal sponsor team/staff resources.
• Some fiscal sponsors have received general operating funds from funders to help build sustainability/scale. (I will share that I worked at a different fiscal sponsor that focused on providing fiscal sponsorship to folks in one state in particular, and that fiscal sponsor was able to secure occasional funding from local funders/foundations.)