Thank You Letter After Internship or Trial Period: Templates for UK and US
Finishing an internship or trial period is a transition moment. You are moving on, but the relationships you have built over the past weeks or months do not need to end with your final day. A well-written thank-you letter is one of the simplest and most effective ways to leave a lasting positive impression, maintain your professional network, and — when the timing is right — open the door to a recommendation or a future opportunity.
According to LinkedIn's 2023 Talent Trends data, 70% of professionals were hired at a company where they had a personal connection. Many of those connections began as internship supervisors, team leads, or mentors who remembered a candidate specifically because of how professionally they handled their exit. The thank-you letter is a small investment with a potentially significant long-term return.
This guide explains when to send your letter, what to include, how the UK and US conventions differ, and provides two complete realistic templates you can adapt immediately.
When to Send: Timing Advice for UK and US
In the United Kingdom
In the UK, the conventional approach is to send your thank-you letter on your final day or within the first two working days after your internship ends. On the final day itself, a brief in-person thank-you to your supervisor and key team members is expected; the email can follow that same afternoon or the next morning.
For formal graduate placements — those attached to structured graduate schemes at major companies, law firms, or banks — a more formal written note (which can still be an email) is appropriate and in some cases expected. In these contexts, a brief handwritten card in addition to an email is appreciated in traditional British professional cultures, though it is not obligatory.
UK professional culture values genuine warmth without excess. A concise, specific, and professionally warm email is considerably better received than a long, effusive one.
In the United States
US professional convention is similarly prompt — same day or within 24 hours is the norm. The tone is typically warmer and more personal than in the UK, with a greater emphasis on the individual relationships formed during the placement.
In the US, it is also more common to address multiple people individually rather than sending a single group email. If you worked closely with three or four people, separate personalised emails to each — not a bulk message — signal genuine appreciation and are far better received.
Pro tip
Before you leave on your final day, collect the direct email addresses of the people you want to thank. LinkedIn connections are fine as a supplement, but a direct email is always preferable — it lands in someone's inbox rather than their LinkedIn notifications, which are easier to overlook.
What to Include in Your Thank-You Letter
A strong thank-you letter after an internship has five components:
Opening with genuine appreciation: Thank the person specifically — not just "the company" — and reference the length and nature of your placement. "Thank you for the welcome and support throughout my three-month placement" is warmer and more specific than "Thank you for the internship."
A specific project or skill highlight: Mention something concrete you worked on or learned. This shows you were paying genuine attention and gives the recipient a memory anchor. "The opportunity to contribute to the client proposal for the Brighton council contract gave me a real understanding of the end-to-end bid process" is far more memorable than "I learned a lot."
An authentic observation about the team or culture: One sentence about what you particularly appreciated — the collaborative atmosphere, the openness to questions, the way the team handled a challenging project — signals that you were observant and engaged, not just going through the motions.
A subtle opening for recommendation (if appropriate): If you would value a LinkedIn recommendation or a written reference, this is the right moment to mention it briefly. Do not make it the focus of the email — lead with genuine gratitude — but a natural, brief mention is entirely appropriate: "If you felt my contribution was positive and you were open to writing a brief LinkedIn recommendation at some point, I would be genuinely grateful."
A warm close: Express genuine hope to stay in touch, offer your contact details, and sign off warmly but not over-familiarly.
Example
Aisha Patel completed a three-month marketing internship at a design agency in Bristol. On her final day, she thanked her supervisor in person and sent a personalised email the following morning. She mentioned specifically the rebranding project she had contributed to and noted what she had found most valuable about the team's approach to client feedback. Her supervisor forwarded the email to the agency's managing director with a brief note: "This is the kind of person we should be trying to hire when we have the headcount." Aisha received a job offer from the agency eighteen months later when a permanent role opened up.
Ready-to-Use Templates
Version A: Formal UK Tone
Subject: Thank you for my placement at Harrington & Blake
Dear Ms. Fletcher,
I wanted to write to express my sincere thanks for the welcome and guidance I received during my three-month placement at Harrington & Blake.
The opportunity to contribute to the consumer research project for the East Midlands retail client was genuinely one of the highlights of my placement. Your team's approach to iterative research and the way you involved placement students in actual client deliverables gave me a level of practical experience I will carry forward into my career.
I particularly appreciated your openness to questions throughout the placement and the feedback you provided following the mid-point review — it was specific, constructive, and directly useful.
I hope we have the opportunity to stay in touch. If you felt my contribution was strong enough to support a brief LinkedIn recommendation at some point, I would be grateful, though I understand entirely if your schedule does not allow for it.
Thank you again for a genuinely valuable experience.
Kind regards, James Whitfield james.whitfield@email.com | LinkedIn: linkedin.com/in/jameswhitfield
Version B: US / Casual Tone
Subject: Thanks for an amazing summer — Aisha Patel
Hi Rachel,
I just wanted to take a moment to say a genuine thank you for everything over the past ten weeks. Working at Clearbridge has been one of the best professional experiences I have had, and a big part of that came down to you and the team.
The opportunity to work on the product launch campaign from the brief stage all the way through to the Instagram rollout was something I genuinely did not expect to get as an intern — I am really grateful for the level of ownership you gave me.
I also want to say that the way your team handled the client feedback on the second campaign revision — openly, constructively, and without throwing anyone under the bus — taught me more about professional communication than any class I have taken.
I would love to stay connected on LinkedIn, and if you ever felt like leaving a quick recommendation on my profile, I would absolutely appreciate it. Either way, thank you so much for everything.
Best, Aisha Patel aisha.patel@email.com | LinkedIn: linkedin.com/in/aishapatel
Common Mistakes to Avoid
Sending a generic email that could have been written by anyone. A thank-you letter that mentions no specific project, no specific person, and no specific learning is essentially a form letter. It signals low effort, which is precisely the opposite of the impression you want to leave. Spend ten minutes making it real.
Asking for a recommendation before expressing gratitude. The request for a recommendation should come at the end — after genuine, specific appreciation. An email that feels primarily like a recommendation request with gratitude added as a preface will be perceived as transactional.
Sending after too long a delay. A thank-you letter sent two weeks after your placement ended misses the window. The sooner you send it, the more directly it connects to the experience you shared, and the more natural it feels to receive.
Addressing it to "the team" rather than individuals. A group email to "the marketing team" is significantly less effective than personalised notes to the two or three people you worked most closely with. Personalisation takes an extra few minutes per email and is worth the effort.
Not following up the connection on LinkedIn. A thank-you email is a great starting point, but connecting on LinkedIn the same day means the relationship has a channel for staying active over time. When you apply for your next role, a message to the supervisor you thanked warmly — acknowledging the time that has passed but referencing the placement — is far warmer than a cold reconnect after two years of silence.
Watch out
Do not use the thank-you letter as the moment to push for a permanent job offer. If the company offered you a role, you would already know. A thank-you letter that implicitly lobbies for employment can feel pressuring and undermines the genuine warmth you want to convey. Keep it appreciative and forward-looking, not transactional.
Related Templates
For other key moments in your job search, see our guides on how to write a thank-you email after a job interview and how to send a speculative application to a company.