Fiscal Sponsorship Tax Implications: Model A vs Model C, Donor Deductibility, and Transition to 501(c)(3)

A charitable project without its own 501(c)(3) status cannot issue tax-deductible receipts to donors. Donors who give directly to the project are making a gift to a non-qualified organization, and the gift is not deductible under IRC 170. Fiscal sponsorship solves this by routing the donation through an existing 501(c)(3) (the “sponsor”) that accepts the funds, issues the receipt, and disburses money to the project. The donation is legally a contribution to the sponsor, not a pass-through to the project, and the sponsor’s exempt status is what makes it deductible. But the legal structure matters enormously. Model A and Model C fiscal sponsorship create different relationships between the sponsor, the project, and the donors, with different reporting obligations, liability exposure, and operational constraints. Getting the structure wrong can cost the donor their deduction, cost the sponsor its exemption, or trigger excise taxes on what should have been a routine grant.

What’s fiscal sponsorship and when is it used?

Fiscal sponsorship is a contractual arrangement between a 501(c)(3) organization (the sponsor) and a project that lacks its own tax-exempt status. The sponsor provides access to its exempt status for fundraising. Donors make contributions to the sponsor “for the benefit of” the project, and the sponsor disburses the funds subject to its oversight and control.

The arrangement has no specific IRS regulation. It is governed by general exempt-organization principles: the donation must be a genuine contribution to the sponsor (not a conduit payment), the project’s activities must further the sponsor’s own exempt purpose, and the arrangement must not produce private benefit. On the donor side, IRS rulings on gifts passed on to foreign charities (Rev. Rul. 63-252 and 66-79) look past the charity to where an earmarked gift really goes, so the gift is deductible only if the charity has approved the project as furthering its own exempt purposes and has control and discretion over its use. On the sponsor side, Rev. Rul. 68-489 holds that a 501(c)(3) can pass funds to a group that isn’t exempt without risking its own exemption, as long as it keeps control and discretion over the funds, keeps records showing they were used for exempt purposes, and limits the grants to specific projects that further its own exempt purposes.

Projects use fiscal sponsorship when they need deductible fundraising immediately but the Form 1023 application can take months to process, when a time-limited project (a documentary film, a research study, a community event) does not justify the compliance cost of a separate 501(c)(3), when a group wants to test viability before committing to incorporation, or when an international project operating outside the US wants to solicit US donors. In each case, the sponsor provides the infrastructure and the project provides the mission.

How does Model A (comprehensive/direct project) work?

In Model A, the project becomes a program of the fiscal sponsor. There is no legal separation: the project’s staff are employees of the sponsor, the project’s contracts are in the sponsor’s name, the project’s assets belong to the sponsor, and the sponsor’s board has ultimate authority. The project may have its own advisory committee and branding, but legally it is a division of the sponsor.

The donor writes a check to the sponsor, receives an acknowledgment letter on the sponsor’s letterhead with the sponsor’s EIN, and claims the deduction. The earmarking (“for the neighborhood park project”) does not affect deductibility because the sponsor retains variance power: the legal authority to redirect the funds to a different program within its mission if the earmarked project becomes infeasible.

The sponsor carries full operational responsibility: payroll (withholding, W-2s, unemployment, workers’ compensation), accounting (the project’s financials are on the sponsor’s books and Form 990), insurance (the sponsor’s policies cover the project), and compliance (the sponsor ensures the project’s activities do not create unrelated business income or private benefit). The sponsor is also liable for the project’s obligations, including employment claims and contract disputes.

Model A provides the strongest protection for donor deductibility because the sponsor’s control is unambiguous, but it is the most operationally demanding for the sponsor.

How does Model C (pre-approved grant) work?

In Model C, the sponsor does not absorb the project. The sponsor receives the donation, retains variance power, and makes a grant to the project, which operates independently with its own legal identity, bank account, staff, and governance. From the donor’s side, the experience is the same: give to the sponsor, receive an acknowledgment, claim the deduction. Behind the scenes, the sponsor evaluates the project’s proposed use of funds, determines that it furthers the sponsor’s exempt purpose, and issues a grant with a written agreement specifying the charitable purpose, restrictions on use, reporting requirements, and the sponsor’s right to reclaim unused funds.

If the grantee is not a 501(c)(3) public charity, a public charity sponsor must keep control and discretion over how the grant is used and keep records showing it went to exempt purposes (Rev. Rul. 68-489); in practice that means a pre-grant review, a written grant agreement and reports from the grantee. A private foundation sponsor must also exercise formal “expenditure responsibility” under IRC 4945(h) and report it with its Form 990-PF. Failure can trigger excise taxes under IRC 4945 for a private foundation, and weak control can put any sponsor’s exempt status at risk.

Model C gives the project more independence and the sponsor less liability, but demands rigorous grant-making documentation. If the IRS concludes the sponsor was merely a conduit (passing money without exercising real discretion), donations may be reclassified as non-deductible gifts to the project.

What’s “variance power” and why does it matter?

Variance power is the sponsor’s legal right to redirect donated funds away from the donor’s designated project. Without it, the donation is a contribution to the project through the sponsor as a conduit, and if the project is not a 501(c)(3), the donation is not deductible.

The principle comes from IRS rulings on earmarked gifts that a US charity passes on to a foreign charity (Rev. Rul. 63-252 and 66-79): when a gift is earmarked, the IRS looks past the charity that received it to see who really controls the money. If the charity has approved the project as furthering its own exempt purposes and has control and discretion over the funds, the gift is deductible; if the charity is just a pass-through, it isn’t. Rev. Rul. 68-489 adds the sponsor-side rule: a charity can fund groups that aren’t exempt without risking its own exemption if it keeps control and discretion, keeps records of how the money was used, and limits the grants to specific projects that further its own exempt purposes.

In a fiscal sponsorship agreement, variance power is documented in the written agreement between sponsor and project. The agreement should state that the sponsor has the right, in its sole discretion, to redirect the funds to another use consistent with the sponsor’s exempt purpose. Sponsors almost never exercise this power in practice (doing so would damage relationships with donors and projects), but the legal authority must exist and be enforceable. If the agreement gives the project a binding right to the funds, variance power is illusory and the IRS may disallow the deduction.

Donors should understand that their designation is legally a suggestion. If a donor conditions a gift on the absolute requirement that funds go only to one specific project, the sponsor should decline the gift or inform the donor that the condition conflicts with variance power.

How does the sponsor report the arrangement on Form 990?

In Model A, the project is a program of the sponsor. The project’s revenue is included in the sponsor’s total revenue on Part VIII, and the project’s expenses are in Part IX. A significant project may appear as a separate program on Part III. The project does not file its own Form 990 because it is not a separate tax entity.

In Model C, the sponsor reports donations received as revenue on Part VIII. The grant to the project appears as an expense on Part IX and is detailed on Schedule I (or Schedule F for foreign grantees). Grants to domestic organizations of more than $5,000 are listed on Schedule I, Part II (Part III is for grants to individuals). The project, if it is a separate entity, has its own filing obligation: Form 990, 990-EZ or 990-N (depending on gross receipts) if it is tax-exempt, or a regular income tax return if it isn’t.

How the sponsor shows its fee on Form 990 depends on the model and the terms of the agreement.

What are the risks for the sponsor?

The most significant risk is loss of exempt status. If the IRS concludes the sponsor is not exercising genuine control, is not ensuring that projects further its exempt purpose, or is operating as a fundraising conduit for non-exempt activities, the sponsor’s 501(c)(3) status is at stake.

Private benefit is the second risk. If the arrangement produces more than incidental benefit to private interests (project leaders, affiliated for-profit entities, donors receiving goods in exchange for “donations”), it violates the private benefit doctrine and threatens the sponsor’s exemption.

Liability is the third risk, particularly in Model A, where the sponsor is the legal party on all the project’s contracts, employment relationships, and activities. Model C reduces this exposure because the project operates independently, but the sponsor’s grant-oversight obligation remains.

What are the fees and how are they structured?

Fees are usually a percentage of total funds received, and the rate varies from sponsor to sponsor. The fee covers accounting, tax reporting, insurance, compliance oversight, payroll processing (Model A), and grant administration (Model C). Some sponsors use a flat monthly fee or a sliding scale with lower percentages for larger projects. Additional charges may apply for payroll, benefits administration, or legal review.

The donor’s deductible contribution is the full amount given to the sponsor. The sponsor deducts the fee from the funds available to the project. The project bears the cost.

When should a project get its own 501(c)(3) instead?

Fiscal sponsorship is not a permanent substitute for exempt status. A project should consider applying when the sponsorship fees exceed the cost of maintaining a separate organization (for a project receiving $100,000 at an 8% fee, the cost is $8,000 a year, which can be more than a small 501(c)(3) spends on its own accounting, filings, and insurance), when the project plans to operate indefinitely, when institutional funders require independent 501(c)(3) status, or when the project’s mission has diverged from the sponsor’s exempt purpose.

How does the transition to independent status work?

The project incorporates as a nonprofit corporation and applies for 501(c)(3) status using Form 1023 or 1023-EZ. The IRS generally grants retroactive exemption to the date of incorporation if the application is filed within 27 months. Once the determination letter arrives, the sponsor transfers remaining funds and assets to the new organization (reported as a grant on the sponsor’s Schedule I in Model A; in Model C, the sponsor releases remaining grant funds and terminates the agreement). The project notifies donors to redirect future gifts, and past acknowledgment letters remain valid because the donation was to the sponsor at the time it was made.

The project may choose to maintain fiscal sponsorship during the application period so donors continue receiving deductible receipts, then terminate the arrangement once the determination letter arrives. The project files its own annual return (Form 990, 990-EZ or 990-N) starting with its first independent tax year, and the sponsor keeps its records for as long as they may be needed to show compliance, generally at least until the statute of limitations runs.

What should I do next?

If you are a project considering fiscal sponsorship, identify a sponsor whose exempt purpose genuinely aligns with your mission. If you are a 501(c)(3) considering offering fiscal sponsorship, develop a written policy covering project evaluation criteria, fee structure, variance power provisions, oversight procedures, and termination terms. If you are currently in an arrangement, confirm that the sponsor is issuing correct donor acknowledgment letters, reporting properly on Form 990, and (for Model C) exercising expenditure responsibility where required.

• Nonprofit 501(c)(3) application and Form 1023, the full application process for transitioning from fiscal sponsorship to independent status
• Nonprofit Form 990 filing guide, where the sponsor reports fiscally sponsored project revenue and grants
• Nonprofit donor acknowledgment and tax receipts, the written substantiation the sponsor must provide to donors under IRC 170(f)(8)
• Nonprofit grant management and restricted funds, expenditure responsibility requirements and grant agreement terms for Model C sponsorships
• Private foundation excise taxes, the IRC 4945 expenditure responsibility rules that apply when a private foundation sponsor makes grants to non-public charities

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.