Generally, organizations involved in political and lobbying activities are required to file Schedule C (Form 990-EZ or Form 990).
Here is the list of other organizations that needs to file Schedule C
The Schedule C will be generated automatically if required while filing your Form 990-EZ using the "Interview-Based" filing in ExpressTaxExempt. The Schedule C will be made available to you depending upon the information you enter in your Form 990-EZ using the "Form-Based" filing in ExpressTaxExempt.