How to Write a Reference Letter (Template)
Someone trusted you enough to name you as their referee; now a document with your name on it will be read by people deciding their future. The reference letter is a trust instrument, and it runs on a fixed architecture: four paragraphs, evidence for every claim, and an endorsement scaled to what you can honestly say. This guide builds it, and starts with the question most guides skip.
First Question: Should You Write It at All
A referee who cannot write with genuine warmth should decline, because a faint-praise letter is read instantly and damages the candidate more than no letter at all. I am not confident I can be the strongest referee for this, said fast and kindly, lets them find someone better positioned, and they will thank you for it quietly. Readers of reference letters are calibrated to lukewarm code: solid, reliable, completed tasks as assigned. If your honest letter would translate to that register, the decline is the service. Decline warmly and fast so they can find another referee.
The Four-Paragraph Architecture
The letter runs four paragraphs: who you are and your relationship with duration, two or three strengths each carried by a specific example, the character fit for the target, and an unambiguous endorsement with your contact details.
- Relationship: As Wei Ming's manager for three years at Meridian, I supervised his work on twelve regional accounts.
- Strengths with examples: two or three claims, each with one dated, specific proof.
- Fit for the target: one paragraph connecting those strengths to the role or programme applied for.
- Endorsement and contact: a clear recommendation line, your title, email and phone.
Under one page always; length signals anxiety, not strength.
Evidence per Strength

Every claimed strength carries one dated, specific example, she rebuilt the reporting pack in a week during the audit, because unverifiable adjectives are the reference letter's fake currency. Worked example of the upgrade: strong analytical skills becomes her variance analysis caught the double-count the audit missed, in March, before it reached the client. Use only examples you can defend if called. The dated-specific pattern is what separates letters readers believe from letters they skim.
The Endorsement Line
The closing endorsement is unambiguous and scaled to your honest confidence, I recommend her without reservation versus I recommend her, because readers calibrate to those exact words. The strong form is earned by the evidence above it; the moderate form is honest for a strong-but-not-exceptional relationship. Offer your contact details and mean it; some readers call, and the call should find the same person who wrote the letter.
Format and Submission Mechanics
Use letterhead where possible, follow the submission route the candidate specified, and never send the candidate a copy of a confidential letter unless invited, because mechanics carry as much weight as wording in formal processes. Deadlines belong to the candidate's application; calendar them on acceptance. A late reference letter is a decision made about you both. Formal letters reward the boring disciplines: right route, right deadline, right letterhead, one page.
Formal Letters as a Register
Reference letters, verification notes and formal endorsements share one register, and small-group practice with correction keeps the register ready for the requests that arrive without warning. The four-paragraph architecture carries the structure; the evidence discipline is the habit worth training. iWorld Learning's Business English small-group classes mark formal documents as part of the professional register. Keep letters you were proud of as patterns.
Frequently Asked Questions
How long should a reference letter be?
Three to five paragraphs on one page; a letter that runs to two pages signals the referee lost control of the argument.
Should I mention the candidate's weaknesses?
Not in a reference letter; honest reservations belong in a private conversation if a verifier calls, not in a document the candidate may hold.
Can I reuse the same letter for multiple applications?
Only with the target-paragraph rewritten each time; readers spot a generic letter the way recruiters spot a generic resume.