Tax Guide Detailing Your Team’s Public Support with 990 Schedule A IRS 990 Schedule A – Demonstrating Public Support for your Non-profit Continuing PDFfiller‘s review of tax forms, we come to the 990 Schedule A which lays out the detailed financial ... Tax Guide Proving Public Charity Status with Form 990 Schedule A So you run a 501(c) tax-exempt organization, and you know that you still need to file a Form 990 or Form 990-EZ in order to detail to the IRS ...