We set up a custom post type with a custom taxonomy and realized that Authors were unable to add new terms.

This took a bit of googling and trial and error so here is a good way to allow authors in WordPress admin area to add or edit taxonomy terms that can be used with posts or custom post types.

It’s as simple as adding a new capability.  Here’s how we did it.

Install Members Plugin to manage capabilities on a per role basis.

Edit the respective role, for us it was the Author role that was missing the capability to add new terms.

Add a new custom capability assign__terms (copy and paste to get the correct double-underscore character)


That’s it!  Save and you should be able to test your author role can now add categories or custom terms to the custom taxonomies in the WordPress admin area.