Getting a Supporting Medical Letter for Your ESA Claim

Updated June 2026

A well-written supporting letter from your GP or another health professional can make a real difference to an Employment and Support Allowance claim. It is not usually a requirement to start a claim - a fit note normally does that - but at the ESA50 stage, at mandatory reconsideration and at appeal, the right letter can be one of the strongest pieces of evidence you submit. This guide explains who can write one, exactly what to ask for, what a useful letter should say, and how to get it without paying more than you need to.

Why a supporting letter matters

The Work Capability Assessment (WCA) is the test that decides whether you have limited capability for work and which group you belong in. It does this by scoring how your conditions affect a set of WCA activities, not by counting how many diagnoses you have. This is the single most important thing to understand about medical evidence for ESA: a diagnosis on its own carries surprisingly little weight, while functional detail carries a lot.

A good supporting letter bridges that gap. It takes your conditions and translates them into the language the assessment actually uses - what you can and cannot do, how often, and how reliably. The WCA is about capability for work and is completely separate from Personal Independence Payment, which looks at daily living and mobility, so the letter should describe functional limits in work-relevant terms rather than borrowing PIP concepts. You can see how the test works in our complete WCA guide and our explainer on how the WCA descriptors are scored.

Who can write a supporting letter

Your GP is the most common and obvious choice, because they hold your medical records and usually have the broadest picture of your health. But they are not the only option, and sometimes not the best one. The most persuasive evidence comes from whoever knows your day-to-day function most closely. Depending on your conditions, that could be:

• A consultant or specialist who manages a particular condition and can speak to its severity and prognosis.
• A psychiatrist, community psychiatric nurse or care coordinator for mental health conditions - they often see how you cope week to week far better than a GP does.
• A physiotherapist or occupational therapist who has assessed your physical function, mobility or ability to manage tasks.
• A specialist nurse for long-term conditions such as diabetes, epilepsy, multiple sclerosis or cancer care.
• A support worker, carer or family member who sees your limitations daily. Their statement is not clinical evidence, but it corroborates the picture and can be very effective alongside a clinician's letter.

You do not have to choose just one. A short GP letter plus a copy of a recent consultant clinic letter and a statement from someone who cares for you can together paint a much fuller picture than any single document.

What a useful supporting letter should say

The difference between a letter that helps and one that is ignored usually comes down to functional detail. A letter that simply says "this patient has depression and chronic back pain" tells the assessor almost nothing about your capability for work. A letter that explains what those conditions stop you doing, and how reliably, is powerful. Ask the writer to cover:

• Your diagnoses, how long you have had them, and how they are expected to progress.
• The treatments tried, including medication, therapy, surgery and anything that has not worked or has caused side effects.
• The functional effect on specific activities - for example difficulty mobilising, staying at a workstation, using your hands, concentrating, coping with change, or being around other people. Linking each limitation to a WCA activity is ideal. Our individual activity pages, such as activity 1 (mobilising) and activity 16 (coping with social engagement), show the kind of detail that matters.
• Reliability. This is the part most letters miss. The law says you can only be treated as able to do something if you can do it reliably, repeatedly, safely and in a reasonable time period, the majority of the time. If you can climb the stairs once but not again, or can do a task only on a minority of days, the letter should say so.
• Good days and bad days. If your function fluctuates, ask the writer to describe the range and roughly how often the bad days occur, rather than describing a single snapshot.

For the strongest cases, especially where you are aiming for the Support Group, ask the clinician to address the substantial-risk rule: whether being found capable of work or required to do work-related activity would pose a substantial risk to your physical or mental health. A plain clinical statement of risk is often the single most effective sentence in a supporting letter. Our pages on substantial risk and on how to qualify for the Support Group explain when this applies.

How to ask your GP - making it easy for them

GPs are busy, and a vague request often produces a vague letter. The way to get something useful is to make the request specific and to do as much of the thinking for them as you can. A practical approach:

1. Put the request in writing, by letter, email or through the practice's online system, so there is a clear record of what you asked for.
2. Say what it is for. Explain that you are claiming ESA (or being reassessed) and that the WCA scores how your conditions affect your capability for work.
3. List the points you need covered as short bullets - your main conditions, the activities they affect, and a request to comment on reliability and, if relevant, substantial risk.
4. Mention the deadline if you have one, such as the date your ESA50 must be returned, so the practice can prioritise it.

Handing over a tidy bullet list means the GP can write something focused in a few minutes rather than guessing what you need. It also makes it far more likely the letter addresses function and reliability rather than just restating your diagnoses.

Will it cost anything?

Writing a benefits support letter is not part of a GP's NHS work, so practices are allowed to charge for it. Some charge a fee, some write short letters for free, and policies vary widely. Always ask first. If a charge would be a problem, remember that you have free alternatives that carry real weight:

• Fit notes are free and confirm you are not fit for work during the assessment phase.
• Copies of existing letters - clinic letters, discharge summaries, care plans, medication lists - usually cost little or nothing and corroborate your case.
• Your own detailed ESA50 answers, written carefully, are evidence in their own right. See our guide on how to fill in the ESA50 and our wider evidence checklist.

Fit notes versus supporting letters

It is worth being clear that a fit note and a supporting letter do different jobs. A fit note (the Statement of Fitness for Work) confirms that your GP considers you not fit for work and is what keeps your claim running through the assessment phase. A supporting letter goes further and describes how your conditions limit you against the WCA activities. You can and often should use both - one keeps the claim alive, the other helps you score points and reach the right group.

When and how to submit it

Timing matters. The ideal is to include your supporting evidence with the ESA50 (or the UC50 on Universal Credit) so the assessor reads it before the Work Capability Assessment. If you only obtain the letter later, you can still use it - submit it before your assessment, or use it at mandatory reconsideration or, if needed, at tribunal, where new evidence is exactly what often tips the balance. Whenever you send anything:

• Keep a copy of everything for yourself.
• Quote your National Insurance number or claim reference on every page.
• Confirm the DWP has received it and note the date you sent it.

If your claim has already gone wrong, a strong supporting letter is often the key to turning it around. See our guides to the mandatory reconsideration stage and the tribunal appeal for how evidence is used at each stage.

A note on health data and consent

When you ask a professional to write about your health, you are sharing sensitive personal information. Make sure you are comfortable with what is being disclosed and to whom. The DWP needs enough detail to assess your capability for work fairly, but you control what evidence you choose to submit. If you are unsure what to include, a free adviser at Citizens Advice or a local welfare rights service can help you decide.

Official sources

This guide reflects the official Work Capability Assessment rules. For the source material, see:

• GOV.UK - Employment and Support Allowance
• GOV.UK - Work Capability Assessment guidance for healthcare professionals
• The Employment and Support Allowance Regulations 2013 (Schedule 2 - WCA descriptors)
• Citizens Advice - Employment and Support Allowance

Guidance only, not legal advice. Rules can change - always check GOV.UK for the latest.

Frequently Asked Questions

Related Guides

• ESA evidence checklist
• How to fill in the ESA50 form
• Substantial risk explained
• How to qualify for the Support Group
• What to say at your WCA assessment