What is the required line spacing for an APA formatted paper?

In an APA formatted paper, the required line spacing is double-spacing throughout, including all text in the body of the paper as well as the reference list. This standard helps to enhance readability by providing adequate space between lines, making it easier for authors, reviewers, and readers to engage with the material. Consistent double-spacing also ensures that any comments or edits can be easily inserted in the margins. Adhering to this guideline is crucial in maintaining the professional appearance of the manuscript and aligns with the conventions established by the American Psychological Association for scholarly writing.