| A | B |
| Top margin | 2" |
| Side margins | 1"-1.25" |
| Bottom margin | At least 1" |
| Begins with sender's address | Personal Business Letter |
| Begins with date | Business Letter |
| Space between sender's address and date on PBL | SS |
| Space between Greeting and body | DS |
| SS | Tap the Enter key 1 time |
| DS | Tap the Enter key 2 times |
| QS | Tap the Enter key 4 times |
| Space between Date and Inside (Recipient's)Address | QS |
| Open Punctuation | No punctuation after Greeting and Close |
| Mixed Punctuation | : after greeting and , after Close |
| Space between paragraphs in the Message of the letter | DS |
| Spacing within paragraphs in the Message of a letter | SS |
| Space between Body and Complimentary Close | DS |
| Space between Close and Writer's keyed name | QS |
| Space between Greeting and Body | DS |
| Align all parts of the letter to the left margin | Block Format |
| The date and closure and writer's name are keyed at center point (usually 6 tabs) | Modified Block Format |