Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Annual fiscal sponsorship fee
$16,000
Margin over actual admin cost
$2,000
Margin as % of fee
12.5%
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter sponsored project's annual revenue ($).
- 2Enter fiscal sponsorship fee rate (%).
- 3Enter sponsorship model.
- 4Enter your estimated actual admin cost to serve ($).
- 5Read your annual fiscal sponsorship fee on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Fiscal sponsors typically charge 5-10% of a sponsored project's revenue to cover the real administrative burden of pass-through grantmaking: processing payments, issuing tax receipts, filing consolidated 990s, HR and payroll if staff are employed, insurance, and legal liability the sponsor absorbs. This calculator takes a sponsored project's projected annual revenue, applies a fee percentage, and compares the resulting fee dollars against your estimated actual cost to administer that project, so you can tell whether your rate is underpricing the real burden (common with comprehensive Model A sponsorship where the sponsor takes on full HR and legal responsibility) or overcharging relative to a lighter-touch Model C or grantor-grantee relationship.
Worked example
Using the values the calculator loads with:
Inputs
- Sponsored project's annual revenue: 200000 $
- Fiscal sponsorship fee rate: 8 %
- Sponsorship model: Model A — comprehensive (staff, HR, full liability)
- Your estimated actual admin cost to serve: 14000 $
Results
- Annual fiscal sponsorship fee: $16,000
- Margin over actual admin cost: $2,000
- Margin as % of fee: 12.5%
What each field means
Inputs
- Sponsored project's annual revenue ($)
- The sponsored project's annual revenue used in the calculation, measured in $. Starts at 200000 $ so you have a working example on load.
- Fiscal sponsorship fee rate (%)
- The fiscal sponsorship fee rate used in the calculation, measured in %. Starts at 8 % so you have a working example on load. Accepted range: 0–20 %.
- Sponsorship model
- Pick the option that matches your situation — the maths changes per option. Choices: Model A — comprehensive (staff, HR, full liability), Model C — pre-approved grant relationship (lighter).
- Your estimated actual admin cost to serve ($)
- The your estimated actual admin cost to serve used in the calculation, measured in $. Starts at 14000 $ so you have a working example on load.
Results
- Annual fiscal sponsorship fee
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Margin over actual admin cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Margin as % of fee
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's a typical fiscal sponsorship fee range?
Model A comprehensive sponsorship, where the sponsor employs project staff and takes on full legal and financial liability, typically runs 8-10% of project revenue. Lighter Model C pre-approved grant relationships, where the sponsor mainly provides tax-exempt pass-through and grant administration, often run 5-7%.
What should the fee actually cover?
Bookkeeping and financial reporting for the project, tax receipt issuance to project donors, inclusion in the sponsor's consolidated audit and Form 990, insurance coverage, HR/payroll administration if staff are employed by the sponsor, and the sponsor's legal liability for the project's compliance.
Can the fee be a flat dollar amount instead of a percentage?
Yes, some sponsors use flat monthly fees or tiered flat fees for small projects, since a percentage fee on a very small project might not cover the fixed administrative cost of onboarding and monthly bookkeeping regardless of revenue size.
What happens if the fee doesn't cover actual admin cost?
The sponsor is effectively subsidizing that project from its own general operating funds, which is unsustainable across a portfolio of projects. If your margin analysis is consistently negative, raise the fee rate or add a minimum flat fee for smaller projects before taking on new sponsored initiatives.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Fiscal Sponsorship Fee Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/fiscal-sponsorship-fee
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/fiscal-sponsorship-fee" target="_blank" rel="noopener">Fiscal Sponsorship Fee Calculator — RevenueLab</a> (2026).</p>
Source: [Fiscal Sponsorship Fee Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/fiscal-sponsorship-fee) (2026).