The tax return deadline for tax-exempt organizations is May 15, 2010. An extension will give you until August 15. If you need additional time, you can file another extension (with a reason) which will give you until November 15, 2010. If your organization has over $25,000 in gross receipts, you must file a Form 990 tax return. If your organization grossed less than $25,000, you must still file a Form 990-N (e-postcard) electronically no later than May 15, 2010. Failure to file this e-postcard for 3 years in a row will result in the loss of your organization’s tax-exempt status.