Is there a Council Tax discount for severe mental impairment?
A person who is medically certified as severely mentally impaired and who receives a qualifying benefit is disregarded for Council Tax. This can lead to a discount, or in some cases a full exemption where everyone in the home is disregarded. You claim through your council with a doctor confirmation.
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Check what you're owed →Severe mental impairment, or SMI, is a recognised Council Tax category covering conditions that cause a permanent impairment of intelligence and social functioning, such as dementia, a severe learning disability or the lasting effects of a stroke. The household does not pay extra Council Tax to count a disregarded person.
To be disregarded, two things are usually needed: a certificate from a doctor confirming the person is severely mentally impaired, and entitlement to one of the qualifying benefits, such as certain disability or incapacity benefits. The council uses both to decide the disregard.
Where the SMI person lives with one other adult, a discount typically applies. Where everyone resident is disregarded, the property may attract a larger reduction. Many families never claim this because they do not realise it exists, and backdating is often possible, so it is worth checking entitlement to this and any related benefits.
How to claim the SMI Council Tax disregard
- Confirm a qualifying benefit. Check that the person receives one of the benefits that qualify them for the disregard.
- Get a doctor certificate. Ask the GP or specialist to complete the SMI certificate confirming the diagnosis.
- Apply to the council. Submit the SMI form with the certificate and benefit evidence to your local council.
- Request backdating. Ask the council to backdate to when the person first met the conditions, where the rules allow.
Key figures (official sources)
- 50% offCouncil Tax discount where every resident is 'disregarded'Source: GOV.UK — Council Tax discounts for disregarded people (checked 2026-06-28)
Frequently asked questions
- What counts as severe mental impairment?
- It is a permanent condition affecting intelligence and social functioning, such as advanced dementia or a severe learning disability, confirmed by a doctor for Council Tax purposes.
- Do I need to be receiving a benefit as well?
- Usually yes. As well as a doctor certificate, the person normally needs to qualify for one of a list of disability or incapacity benefits set by the rules.
- Can the discount be backdated?
- Often it can be backdated to when the qualifying condition and benefit were both in place, which can mean a meaningful refund.
- What if the SMI person lives alone?
- If they are the only adult and are disregarded, the property may be exempt rather than just discounted. Your council can confirm based on the household.
MoneyFinder is an independent sign-posting service that helps you find financial support you may be entitled to. We are not a government body and do not provide financial advice. Figures are taken from the official sources cited above and were correct when last checked — always confirm current details on the linked GOV.UK pages.