Exemption applications must be filed with your local assessor's office. See our Municipal Profiles for your local assessor's mailing address.While organizations without 501c3 status can't apply for grants, there are still ways to legally accept donations, fund their business, and serve the community. To be taxexempt under section 501(c)(3) of the Internal Revenue Code, an organization must be organized and operated exclusively for exempt purposes. Determination of Exempt Status. File applications for tax exemptions with the IRS and California. Franchise Tax Board (FTB). Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS. Fill out the form to be considered for a donation. We will contact you for a copy of your 501c3 tax letter in a follow-up email.