If you contribute long-term appreciated securities to the Archdiocese, you receive a two-fold income tax benefit: a charitable deduction for the full present fair market value and no tax on the value of the appreciation. The limit on deductibility in any tax year is 30% of your adjusted gross income; any excess is deductible over the next five years.
If you wish to contribute securities on which you have a loss, consider selling them instead and donating the proceeds to the Archdiocese of Omaha. You will then realize a tax deduction for the loss in addition to the charitable deduction.
For legal and professional advice, please consult an attorney.