Writing a business letter feels like it should be simple. Then you sit down to write one, and suddenly you’re not sure where the date goes, whether to indent your paragraphs, or how to sign off without sounding stiff or too casual.
A business letter follows a set structure return address, date, recipient’s address, salutation, body, closing, and signature typically left-aligned in block format, single-spaced, with a blank line between each section. Use a professional font like Times New Roman or Arial at 11–12pt, with one-inch margins on all sides. Get those pieces right, and the rest of the letter takes care of itself.
What Is a Business Letter?
A business letter is a formal, written communication sent between companies, organizations, or professionals for a specific purpose: a request, an update, a complaint, an offer, or a formal notice.
Unlike an email or a text, a business letter follows strict formatting conventions. That structure isn’t just tradition, it signals professionalism and makes the letter easy to scan, file, and act on.
The 7 Essential Parts of a Business Letter
Every standard business letter contains seven core parts. Miss one, and the letter can look unfinished or unprofessional.
- Return address (or letterhead) — your name, title, company, and address, placed at the top.
- Date — spelled out in full (e.g., “August 18, 2026”), placed a couple of lines below your address.
- Inside address — the recipient’s name, title, company, and address.
- Salutation — “Dear [Name]:” followed by a colon, not a comma.
- Body — your message, organized into short, focused paragraphs.
- Closing — a professional sign-off like “Sincerely,” followed by a comma.
- Signature block — your handwritten or digital signature, with your typed name and title beneath it.
Some letters also include a subject line, a cc: notation, or an enclosure notation more on those below.
Business Letter Format Types Compared
Most guides only tell you about one or two formats. In reality, there are three you’re likely to encounter, and choosing the right one comes down to how formal your organization is and what looks cleanest on the page.
| Format | Alignment | Best For |
| Full Block | Everything date, address, body, closing, signature aligned to the left margin. No indents. | Most modern business correspondence. The default choice in the U.S. |
| Modified Block | Date, closing, and signature start at the horizontal center; body paragraphs stay left-aligned. | Slightly more traditional or formal organizations; still very common. |
| Simplified | Everything left-aligned, salutation replaced with an all-caps subject line, no complimentary close. | Mass correspondence or when you don’t know the recipient’s name. |
Full block is the most widely used format for U.S. business correspondence because it’s the fastest to type, the easiest to read, and the simplest to standardize across a team. If you’re not sure which to use, default to full block.
Step-by-Step How to Write a Business Letter
Here’s the process from a blank page to a finished, professional letter.
- Start with your contact information. Name, title, company, address, phone, and email one line each at the top left.
- Add the date. Leave one blank line after your address, then write the date in full (month, day, year).
- Add the recipient’s information. Leave another blank line, then include their name, title, company, and address.
- Write the salutation. “Dear [Name]:” use a colon, not a comma, to keep the tone formal.
- Open with your purpose. Your first sentence should state exactly why you’re writing. Don’t bury the lede.
- Build the body in short paragraphs. Each paragraph should cover one idea. Skip a line between paragraphs instead of indenting.
- Close with a clear next step. Tell the reader what you need from them or what happens next.
- Sign off professionally. Use “Sincerely,” “Best regards,” or “Respectfully,” followed by your signature and typed name.
- Proofread before sending. Check names, dates, and figures twice a factual error in a business letter undercuts everything else on the page.
Font, Margins, and Spacing Rules
Formatting mistakes is one of the fastest ways to make a business letter look amateurish. Here’s what to use:
- Font: Times New Roman or Arial, 11–12pt
- Margins: 1 inch on all four sides
- Line spacing: Single-spaced within paragraphs, one blank line between sections and paragraphs
- Alignment: Left-aligned (block format) or centered date/closing (modified block)
- Length: One page whenever possible — business letters are meant to be brief and scannable
If you’re using company letterhead, adjust your top margin so the letterhead doesn’t collide with your return address.
Business Letter Example (Full Template)
Here’s a complete example using full block format. Copy it and swap in your details.
Jordan Ellis
Marketing Manager
Northbridge Supply Co.
482 Harbor Street
Portland, OR 97201
jordan.ellis@northbridgesupply.com
August 18, 2026
Maria Chen
Purchasing Director
Coastal Retail Group
119 Fifth Avenue
Seattle, WA 98101
Dear Ms. Chen:
I am writing to follow up on the proposal we submitted last week regarding a supply partnership between Northbridge and Coastal Retail Group.
Since our call, we’ve adjusted the delivery schedule to match your quarterly inventory cycle, and I’ve attached an updated pricing sheet reflecting that change.
I’d welcome the chance to discuss this further at your convenience. Please let me know a time that works for you this week.
Sincerely,
Jordan Ellis
Marketing Manager
What Salutation Should You Use When You Don’t Know the Name?
When you can’t find a specific contact, avoid outdated options like “To Whom It May Concern,” which can read as impersonal. Instead, try a title-based salutation such as “Dear Hiring Manager:” or “Dear Customer Service Team:” or switch to the simplified format, which replaces the salutation entirely with an all-caps subject line. That sidesteps the guessing game completely.
Digital Business Letters What Changes?
Most business letters are sent as email attachments or PDFs now, not printed and mailed. A few things shift when you go digital:
- Skip the letterhead if it’s not embedded in your document design your email signature already covers contact info.
- Export as a PDF before sending, so formatting doesn’t shift across devices or word processors.
- Use a digital signature most word processors, including Microsoft Word and Google Docs, let you insert a scanned signature or drawn signature image.
- Keep the same structure. The recipient’s address, date, salutation, and closing all stay the same, even in a digital-only letter the formality is what makes it a “letter” rather than an email.
Common Business Letter Mistakes to Avoid
- Using a comma instead of a colon after the salutation (“Dear Mr. Lee,” instead of “Dear Mr. Lee:”)
- Indenting paragraphs in full block format full block never indents
- Mixing formats starting in full block, then centering the closing like modified block
- Vague opening lines that delay the actual purpose of the letter
- Overly casual sign-offs like “Thanks!” or “Talk soon” in a formal context
- Skipping the proofread misspelled names or wrong dates are the fastest way to undercut credibility
Original Insight What Actually Gets Read
Here’s something most format guides skip: recipients rarely read a business letter line by line. They scan the first sentence of your opening paragraph, skim the closing paragraph for the task, and only go back to read the middle if those two points hook their attention.
That means your first sentence and your last paragraph carry more weight than the rest of the letter combined. If you only have time to polish two things before sending, polish those.
Conclusion
Stick to full block format unless your organization has a house style that says otherwise. Keep your font, margins, and spacing consistent Times New Roman or Arial, 11–12pt, one-inch margins, single-spaced. And remember: your first sentence and your closing paragraph do the heaviest lifting, so polish those first.
FAQs
What are the 5 parts of a business letter?
Some guides simplify the structure to five parts: heading, salutation, body, closing, and signature folding the return and inside addresses into the “heading.” The full seven-part breakdown covers the same information in more detail.
What is the most common business letter format?
Full block format is the most widely used in U.S. business correspondence. Every element from the return address to the signature aligns to the left margin, with no indenting.
How do you start a formal business letter?
Open with your return address and the date, followed by the recipient’s address and a formal salutation like “Dear [Name]:”. The first sentence of the body should immediately state your purpose for writing.
What font and margins should a business letter use?
Use a professional font like Times New Roman or Arial at 11–12pt, with one-inch margins on all sides and single-spaced lines.
How do you end a business letter?
Close with a professional sign-off such as “Sincerely,” or “Best regards,” followed by a comma, your signature, and your typed name and title.
Is there a difference between a business letter and a formal letter?
A business letter is a type of formal letter specifically used for professional or commercial correspondence. All business letters are formal, but not all formal letters are business letters; a formal letter could also cover academic or legal correspondence.
