Letter Writing — Types, Format, and Examples

The ability to compose a letter professionally is still crucial in the professional world, even though they are now easier to send due to the prevalence of the internet and email. Determining when and how to write a letter helps senders present themselves in a positive light academically and professionally.

Types of letters

Letters fall into two main categories: formal and informal. Types of letters
Formal Informal
Objective Professional communication Personal communication
Format Fixed format No strict format
Point of view First or third person Any point of view
Audience Businesses, government, employers Family members and friends
Length One page Any length
Style Straightforward and polite Friendly and personal/emotional

The most common purposes for writing either a formal or informal letter include academic letters, employment letters, reference letters, and personal letters.

Types of letters

Business Letters

Employment Letters

Reference Letters

Personal Letters

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How to write a letter

How to write a letter depends upon its purpose. While there are no strict rules for informal letters, formal ones often contain the following components in this order:

Informal vs. formal letters

Letter format

Informal letters have no set structure, but formal letters tend to adhere to the following guidelines:

The sender should include their contact information at the top of the letter. The structure of this information can differ from one letter to the next. It can already be identified on a letterhead, inserted as one line of text, or placed on separate lines. Regardless of the structure, it should include the following:

Sender's contact information

After the sender’s contact information, identify the date the letter will be sent. When writing the date, do not use a superscript and a comma; choose one.

Below the date, include the recipient’s contact information, with each part placed on its own line.

Below the recipient’s contact information, include a salutation or greeting appropriate for the type of letter with the recipient’s name followed by a comma. Formal letters typically start with “Dear [Recipient’s Name].” Include the title (Mr., Mrs., Ms., Dr., etc.) if it is known. If not, use the person’s full name. Avoid “to whom it may concern” and “dear sir or madam” wherever possible.

Body paragraphs should be single-spaced and not indented. Place a blank line between each body paragraph.

Body paragraphs

After the last body paragraph, include a complimentary close (sign off) appropriate for the type of letter, such as “Sincerely,” followed by a comma.

Print the letter and include a handwritten signature, or insert an electronic signature.

Type the sender’s name after the closing, leaving enough space for the signature, about four lines.

Include a blank space after each part of the letter and the body paragraphs.

Examples of letters

While templates vary in the formatting of the text of a formal letter, the following example contains the typical structure:

Formal letter example

The following example details a generic formal employment acceptance letter: