In a typed document, each new paragraph should begin with a first-line indent, applied either with the Tab key or with your word processor’s indentation feature rather than the Space bar. One-half inch is the traditional measure for an indent.
Exceptions: When a paragraph is interrupted by a prose or poetry extract, list, equation, or the like, the text that continues after the interruption begins flush left (i.e., with no first-line indent) unless it begins a new paragraph. Paragraphs immediately following a chapter title or subheading also may begin flush left (it’s optional).
“Wait a minute!” you may be asking. “Why doesn’t this blog post have indented paragraphs?” That’s because there are different guidelines for online display. On a computer screen, it can be tiresome to read long pages of type not broken up by any white space. And when there’s white space between paragraphs, there’s no need for first-line indents as well.
In typewritten and typeset documents (as opposed to online content), paragraph indents offer an important visual cue to the beginning of a new paragraph. Even if your copy will eventually be published online, an editor of the typed copy needs to see where each new paragraph begins, and the conventional first-line indent is the best way to show it.
See CMOS 17, 2.11, for more on tabs and indents.
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