Business Letter Format: Complete Guide with Examples

The Standard Business Letter Format

Business letters follow a universally accepted format that signals professionalism. Deviating from this structure — even slightly — can make a letter appear careless or unprepared. When communicating with partners, clients, or authorities, block formats guarantee maximum readability.

Letter Structure (In Order)

Your Contact Information — Name, company name, address, email, phone, and date. Positioned top left (or top right in modified block layouts).
Date Line — Written out in full (e.g., "June 29, 2026") rather than numbered.
Recipient Address — Recipient name, job title, company name, and address. Skip a line before this section.
Reference Line (Optional) — Starts with "Re:" to state letter purpose immediately (e.g., "Re: Project Proposal #2026-04").
Salutation — Formal greetings (e.g., "Dear Ms. Watson," or "Dear Hiring Manager,").
Opening Paragraph — Get straight to the point. State your primary reason for writing in 2-3 sentences.
Body Paragraphs — Provide supporting data, metrics, or detailed requests. Single-space paragraphs with a double space between them.
Closing Paragraph — Summarize the next action step or request (e.g. follow-up call, contract signing).
Complimentary Close — Standard closes (e.g., "Sincerely," "Respectfully," or "Best regards,").
Signature Block — Sign physically (if printed) or leave 4 blank spaces before your typed name and title.

Letter Styles

Style Name	Alignment Rules	Best Use Case
Full Block	All elements left-aligned; single spaced; double space between paragraphs.	Standard corporate letters & email notices
Modified Block	Sender Address, Date, Close, and Signature positioned at horizontal center.	Semi-formal business communications
Semi-Block	Full Block rules apply, but the first line of every paragraph is indented 0.5 inches.	Traditional, government, or academic letters

Copy-Pasteable Formal Resignation Letter Template

Dear [Manager Name],

Please accept this letter as formal notification that I am resigning from my position as [Job Title] at [Company Name]. My last day of employment will be [Last Day Date, typically 2 weeks from today].

I want to thank you for the opportunities I've had during my time with the team. I have thoroughly enjoyed working on [Project Name] and appreciate the professional mentorship you've provided.

During the next two weeks, I am fully committed to completing my active tasks and assisting with the transition of my projects to other team members. Please let me know how I can be of most help.

Sincerely,
[Your Signature]
[Your Typed Name]