A standard business letter follows a predictable structure: your address, the date, the recipient’s address, a salutation, the body of your message, and a closing with your signature. Getting that structure right signals professionalism before the reader even processes your first sentence. Below you’ll find each component explained, formatting guidance, and a complete sample letter you can adapt.
Parts of a Business Letter
Every formal business letter contains the same core elements, in this order:
- Sender’s address. Your street address, city, state, and ZIP code. If you’re using company letterhead, skip this since it’s already printed. Do not include your name here; that goes at the bottom with your signature.
- Date. Write out the full date (June 10, 2025) one line below your address. Abbreviations like 6/10/25 look informal.
- Inside address. The recipient’s full name, professional title, company name, and mailing address. This always starts one line below the date and is left-aligned.
- Salutation. “Dear” followed by the recipient’s courtesy title and last name, then a colon. For example: “Dear Ms. Nakamura:” or “Dear Dr. Patel:”. If you don’t know their preferred title, use their full name: “Dear Jordan Lee:”. Leave one blank line after the salutation.
- Body. The meat of your letter, organized into at least three paragraphs (more on this below). Single-space within paragraphs and leave a blank line between them.
- Closing. A sign-off phrase like “Sincerely,” or “Thank you,” followed by a comma. Capitalize only the first word. Leave four blank lines for your handwritten signature, then type your full name and title.
- Enclosures (if applicable). If you’re including additional documents like a resume, invoice, or contract, type “Enclosures” or “Enclosure: Resume” below your typed name.
How to Structure the Body
The body is where most people stall, but it follows a simple three-part logic. Your opening paragraph should include a brief, friendly opener and then state your main point clearly. Don’t bury the reason for your letter in the second or third paragraph. A hiring manager, vendor, or client should know what you want within the first few sentences.
The middle paragraph (or paragraphs, if needed) supports your main point. This is where you provide background information, justify a request, present relevant details, or explain the circumstances. Be specific. If you’re writing about a billing error, include the invoice number and date. If you’re proposing a partnership, explain the benefit to the recipient, not just to you.
Your closing paragraph restates the purpose briefly and tells the reader what you’d like to happen next. That might be a meeting, a returned phone call, a refund, or simply confirmation that they received the letter. Include your phone number or email here if you haven’t already, so they can respond easily.
Choosing a Format
The two most common layouts are block format and modified block format. In block format, every element is left-aligned, with no indentation. It’s the simplest to set up and the most widely used in professional correspondence. In modified block format, the date, closing, and signature are moved to the center of the page (or slightly right of center), while the inside address, salutation, and body paragraphs stay left-aligned. Both are perfectly acceptable. If you’re unsure, go with block format.
Regardless of format, use a standard font like Times New Roman or Arial in 11 or 12 point. Set one-inch margins on all sides. Left-justify the body text; do not use full justification, which can create awkward spacing.
Sample Business Letter
Here’s a complete example in block format. This one is a request letter, but the structure works for any purpose: a complaint, a proposal, a cover letter, or a follow-up.
147 Oak Street
Springfield, IL 62704
June 10, 2025
Ms. Rachel Dominguez
Director of Client Services
Apex Solutions Inc.
530 Commerce Drive
Chicago, IL 60611
Dear Ms. Dominguez:
I am writing to request an updated service agreement for our account (Account No. 4481). Our company recently expanded to a second location, and our current contract does not cover the additional site.
Since signing our original agreement in January 2024, we have been very satisfied with the support your team provides. We would like to extend the same level of service to our new office at 203 Pine Avenue, Springfield. Ideally, we would keep both locations under a single contract to simplify billing. I have enclosed a summary of our current service plan for your reference.
Could we schedule a call during the week of June 23 to discuss pricing and next steps? You can reach me at (217) 555-0193 or jcooper@brightwellco.com. Thank you for your time, and I look forward to hearing from you.
Sincerely,
James Cooper
Operations Manager, Brightwell Co.
Enclosure: Current Service Plan Summary
Adapting the Letter for Different Purposes
The sample above is a request letter, but the skeleton works for almost any business situation. For a complaint letter, your opening paragraph states the problem and any relevant order or account numbers. The middle paragraph describes what happened and what resolution you expect. The closing paragraph sets a reasonable deadline and provides your contact information.
For a cover letter, the opening paragraph names the specific position you’re applying for and where you saw it listed. The middle paragraphs connect your experience to the job requirements with concrete examples. The closing paragraph thanks the reader and expresses interest in an interview.
For a resignation letter, keep it short. State that you are resigning, name your last day of work, and express gratitude. You typically don’t need more than two or three paragraphs.
Tone and Language Tips
Business letters work best when they’re direct and concise. Write in complete sentences, avoid slang, and get to the point quickly. A good rule: if a sentence doesn’t give the reader new information or move the letter forward, cut it.
Match your salutation and closing to the situation. “Dear Mr./Ms. [Last Name]:” paired with “Sincerely,” works for most formal letters. If you have an existing relationship with the person, “Dear [First Name]:” with “Best regards,” is fine. Avoid overly casual closings like “Cheers” or “Talk soon” in formal correspondence.
Proofread carefully. A typo in the recipient’s name or company is a particularly bad look. Double-check the spelling of names, the accuracy of any numbers you reference, and the date before you send.
Sending by Email Instead of Print
When you send a business letter as an email, a few things change. You don’t need to include your sender address or the recipient’s inside address at the top, since that information is handled by the email itself. Your subject line replaces the need for a reference line, so make it specific: “Updated Service Agreement Request, Account 4481” is far more useful than “Quick Question.”
The body structure stays the same: opening, supporting details, closing with a clear next step. Skip the four-line signature gap (there’s no handwritten signature in email) and instead use a professional email signature block with your name, title, company, and phone number. If you’re attaching documents, mention them in the body and make sure the file names are descriptive.