Donations to fiscally sponsored projects that come through Artful.ly are deposited in your sponsored fund and released to you when you submit a documented request. But with Artful.ly, ticket revenue goes directly to your bank account so we do not have the opportunity to oversee and approve the way you spend these funds. If we can't monitor how the funds are both collected and spent, than we can't give your patrons a tax-receipt.
This logic applies to memberships and passes too. The revenue for those also goes directly to your bank account so we can't issue tax-receipts for those sales either.
However, a patron may add a fully tax-deductible donation on top of a ticket purchase. Those donations go directly to your sponsored fund and are charged the 7% fiscal sponsorship fee.
We do plan to build features that allow sponsored projects to sell partially-deductible tickets, memberships, and passes. We just haven't gotten to that yet. If this is important to your organization, make your voice heard by adding a vote for this in our feature request forum.