There are many formats for chapter headings, but one thing that can’t be wrong is the numbering. #writetip If you’re self editing, and I would guess lots of authors are, at least before submitting to an agent or publisher, check your numbers carefully.
By the time an author completes a novel, I suspect scenes, if not whole chapters, have been reorganized. You might move a scene to an earlier spot in your novel. You might remove a chapter. Infinite changes are possible.
In the end, don’t forget to check the chapter numbers are in right. It’s easy to re-use a chapter number or skip one all together. I print my manuscript and spread is chapter by chapter across the floor.
Other small things I check:
– Are the headings a consistent font and character size?
– Are the headings positioned at the same spot on the page? By this I mean, check the number of lines before and after the chapter heading. Are all the heading centred, left aligned, or right aligned?
– Do the headings start on a new page?
This many seem small, but it will enhance the professionalism of your submission.