IF YOU KNOW YOU HAVE YOUR 501c 3 STATUS but have lost your determination letter, call the IRS Customer Service for nonprofit organizations at 1-877-829-5500 and give them your corporate name (and EIN if you have it). The best time to call them is about 8:35 a.m. Eastern Time. Later in the day, they may be busy and unable to take your call.

If you're not sure if you have 501c3 nonprofit status, click here.