Screenwriting : How do you write a post-credit scene? by Chris Gannon

This is only a guess, but I would do choice B and include "post-credit scene" in the logline. You might try to find a Marvel script to see what they do.

You don't. Let the director make such decisions.

You're writing a story script, not a shooting script, so there are no credits - and thus no 'post-credit scene.' If there is a scene you want to include that is not part of the story (but why would you want that?), FADE TO BLACK as a transition, then INSERT: (DESCRIPTION/TITLE OF SCENE) and then write the scene per usual, and end with FADE OUT.

But don't take this as a recommendation that you do it. I think it's a bad idea. Just tell the story and bring up the idea at the appropriate time.

I say you write what you want. Your script, your vision.

I have a couple scripts right now where after FADE OUT there is a line of dialog and in another after FADE OUT, there is a single GUN SHOT. I don't care when/where the credit crawl fits - it could be over the dialog/sound for all I care.

Not in my specs but always in my assignments. All the films we shoot are primed to suggest a potential sequel should that become an opportunity. It's worth noting that a post-credit scene is often going to get cut by some outlets regardless, particularly TV.

I cover this in my Grand Finales Blue Book - with examples from movies I've seen (then found the scripts to) and a script to a remake of a hit 80s film that I wrote that's sitting on a shelf at Lionsgate collecting dust.

But I'll save you the $5 for the book and just say - find a couple of scripts that do that and read them.

As long as the main narrative's end and the post credit scene's beginning are clearly marked then its ok. Usually this is indicated in the scene heading as "POST CREDITS" and write the rest of the heading as normal.