Fundamentals of Business Laws and Business Communication · Writing and Drafting for Business Audiences

Business Letters: Parts, Layout and Types Explained

Updated 10 October 2026 · Fact-checked

A business letter is a formal written message sent to people outside or inside an organisation. It has fixed parts: letterhead, date, reference, inside address, salutation, subject, body, complimentary close and signature. To solve questions, identify the letter's purpose, then match it to its type and its parts.

Understand Business Letters: Structure and Types

A business letter is a formal, written message used for business purposes. It creates a record, can be used as proof, and gives a professional image of the firm. Letters are mostly used for external communication, such as with customers, suppliers and banks.

Every business letter follows a standard structure. The common parts are: letterhead (name and address of the sender), reference number, date, inside address (receiver's name and address), salutation (such as Dear Sir/Madam), subject line, body, complimentary close (such as Yours faithfully), signature with name and designation, and optional enclosures and copy marks.

The body usually has three portions: an opening that states the purpose, a middle that gives details, and a closing that states the action expected or a courteous note. Good letters are clear, concise, courteous, correct and complete.

Layout means how the parts are placed on the page. In the full block style, every line starts at the left margin. In the modified block style, the date, close and signature sit on the right, while the rest is at the left. In the indented style, the first line of each paragraph is indented. The semi-block style is similar to modified block but indents paragraph starts. Full block is the fastest to type and the most common today.

By purpose, letters fall into types. An enquiry letter asks for information about goods, prices or terms. A sales letter promotes a product and tries to persuade. An order letter places an order for goods, stating quantity, quality, price, delivery and payment terms. A complaint letter reports a fault, such as damaged or wrong goods, and asks for correction. A circular letter is one message sent to many people at once, for example announcing a new branch or change of address.

Key formulas to remember

Parts of a business letter (in order): Letterhead → Reference and Date → Inside address → Salutation → Subject → Body → Complimentary close → Signature → Enclosures; Learn this order. Questions often ask which part comes after or before another.
Salutation and close pairing: Dear Sir/Madam → Yours faithfully; Dear Mr Sharma → Yours sincerely; Faithfully goes with a general salutation. Sincerely goes with a named person. Many courses treat this as the standard pairing.
Layout styles: Full block: all lines at left margin; Modified block: date, close and signature at right; Indented: paragraph first lines indented; Full block is the simplest and most commonly used style.
Purpose of main letter types: Enquiry = asks information; Order = places order; Complaint = reports fault; Sales = persuades to buy; Circular = same message to many; Use the purpose to identify the type quickly in MCQs.
Qualities of a good letter: Clarity, Conciseness, Courtesy, Correctness, Completeness; These are often tested as features of effective letters.

How to solve Business Letters: Structure and Types questions

Letter questions in an objective paper test parts, layout, purpose and type. Use this method for any such MCQ.

1Read the question and decide whether it asks about structure, layout or type.
2If it asks about structure, recall the standard order of parts and place the part named in the question.
3If it asks about layout, ask where the lines begin: all at left means full block; date and close at right means modified block.
4If it gives a situation, find the sender's purpose: asking, buying, complaining, promoting or informing many people.
5Match the purpose to the letter type: enquiry, order, complaint, sales or circular.
6Check the options for the exact key word, such as 'many people' for circular or 'placing an order' for order letter.
7Eliminate options that describe a different letter type, then choose the best fit.

Quickest way: Purpose-word matching

When to use it: Use for any scenario MCQ that asks which letter is being described or written.

Underline the verb: asks, orders, complains, promotes, announces.
Map it: asks = enquiry, orders = order, complains = complaint, promotes = sales, announces to all = circular.
Pick the option with that type and move on.

Common mistakes in Business Letters: Structure and Types

Confusing an enquiry letter with an order letter.
Both are sent to a supplier and both mention goods.
Fix: An enquiry only asks for details such as price and terms and creates no obligation. An order letter asks for goods to be supplied and, once accepted, forms a contract.
Pairing 'Dear Sir' with 'Yours sincerely'.
Students think both closes mean the same.
Fix: Use Yours faithfully after Dear Sir/Madam and Yours sincerely after a named salutation.
Placing the subject line after the body or before the salutation.
Students do not remember the order of parts.
Fix: Remember the order: salutation, then subject, then body.
Treating a circular as a personal letter to one person.
The word 'letter' suggests one reader.
Fix: A circular carries the same message to many people, so it is usually general and not addressed to one person.
Mixing up layout styles.
Block, modified block and indented sound alike.
Fix: Check the left margin. Everything at left is full block. Date and close at right is modified block. Indented paragraphs indicate the indented style.
Writing a complaint letter in an angry tone.
Students link complaint with anger.
Fix: A good complaint letter is firm but polite, states facts such as date and invoice number, and asks for a clear remedy.

Worked examples

Example 1

A retailer in Pune writes to a wholesaler in Mumbai asking for the latest price list and terms of payment for school bags. Which type of letter is this? (a) Order letter (b) Enquiry letter (c) Circular letter (d) Sales letter

Show the solution

Find the purpose: the retailer is asking for a price list and payment terms.
The retailer is not buying yet, only seeking information.
A letter that asks for information about goods, prices and terms is an enquiry letter.
Eliminate order (no purchase placed), circular (one reader, not many) and sales (not promoting anything).

Answer: (b) Enquiry letter

Example 2

In a business letter, which of the following is the correct order of parts? (a) Salutation, inside address, subject, body (b) Inside address, salutation, subject, body (c) Subject, inside address, salutation, body (d) Body, subject, salutation, inside address

Show the solution

Recall the standard order: letterhead, date, inside address, salutation, subject, body, close, signature.
Inside address comes before the salutation, so option (a) is wrong.
Subject comes after salutation, so option (c) is wrong.
Body comes after the subject, so option (d) is wrong.
Option (b) matches the standard order.

Answer: (b) Inside address, salutation, subject, body

Exam tips

Expect scenario questions that describe a situation and ask for the letter type. Spot the purpose verb first.
Learn the order of parts and the salutation and close pairing, as these are frequent direct questions.
Be ready to separate enquiry, order and complaint letters, as options are often built to look alike.
For layout questions, check where the date, close and paragraphs begin on the page.
There is no negative marking, so always attempt every question after eliminating options.

Practice questions from Writing and Drafting for Business Audiences

Business Letters: Structure and Types in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CSEETTypes of Business Letters

Business Letters: Structure and Types: frequently asked questions

What are the main parts of a business letter?

The main parts are letterhead, reference and date, inside address, salutation, subject, body, complimentary close and signature. Enclosures and copy marks are added when needed.

What is the difference between an enquiry letter and an order letter?

An enquiry letter asks for information such as price, quality and terms, and does not commit the sender to buy. An order letter places a request for goods with details of quantity, price, delivery and payment, and can lead to a contract once accepted.

Which letter layout is most commonly used?

The full block style is the most common today. All lines begin at the left margin, which makes it quick to type and easy to read.

What is a circular letter?

A circular letter is one message sent to many people at the same time. Businesses use it to announce things like a new branch, a change of address or a new product.