Calculating the deduction: Public charities versus private foundations
Men and women can take charitable deductions only if they itemize deductions on their tax returns. Men and women may perhaps deduct as much as 50 percent of their earnings to public charities, and as much as 30 percent to private foundations.

A Letter of Determination is usually a formal notification that the IRS sends your organization when its tax-exempt status has been authorized. Donors may also verify your tax-exempt status by checking IRS Publication 78, which can be titled the Cumulative List of Organizations. This publication is an annual listing of
a large number of tax-exempt organizations to which contributions are deductible as charitable donations.
a large number of tax-exempt organizations to which contributions are deductible as charitable donations.