A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS.Gov, including requests for donation letters. You are able to carry the credit forward up to five years. The donation can also be used as a charitable deduction. If you have any questions, please call our office at (520) 724-8341. Here is a sample thank you letter: Dear ECAP Donor: Once again you have gone the extra mile for our community. PCOA is a qualifying AZ Tax Credit Organization. App for the electronic sample information form that is used to collect food sample information in the field. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS.