Why can't I add income categories to my budget?

You must designate some categories as income-based before you will be able to add any categories to the income section of your budget. Click "Configuration" in the sidebar, click "Categories," and select a category. Click the "Edit" button at the top of the category list, then change the category's type to "Income" and click "Apply Changes." Repeat this process for each of your income categories. When you return to your budget setup, those categories will be available for use in the income section.