Will the GP charge for the SMI certificate?

They should not. The certificate relates to NHS care and should be provided free. If your GP practice charges an admin fee, you can challenge this — many councils will accept a letter from the GP as an alternative.

What if the GP refuses to issue the certificate?

Ask for a referral to a specialist (neurologist, psychiatrist, or memory clinic) for a formal assessment. If the diagnosis is documented in medical records, the GP should not refuse. Consider writing a formal complaint to the practice manager.

Can I claim SMI exemption for a relative who lives alone?

Yes. A family member, carer, or power of attorney can apply on behalf of the person with SMI. You will need the GP certificate and proof of qualifying benefit.

Does SMI exemption affect other benefits?

No. The council tax exemption or discount does not affect entitlement to any other benefit. It is not counted as income.

Severe Mental Impairment Council Tax Exemption: How to Apply

By GetRighted Legal Research TeamLast updated July 2026

Summary

Severe mental impairment (SMI) exemption is one of the most under-claimed council tax reliefs in England. It applies to people with a permanent condition affecting their brain function — dementia, severe learning disabilities, brain injury, or stroke-related impairment — who also receive a qualifying benefit. If the person with SMI is the sole resident, the property is exempt from council tax entirely. If they live with one other adult, a 25% discount applies (the person with SMI is 'disregarded'). Millions of pounds go unclaimed each year because families do not know the exemption exists.

Application process

Steps from start to exemption:

1Confirm the person receives a qualifying benefit (see list below)
2Request a severe mental impairment certificate from their GP — this confirms the diagnosis
3Download the SMI exemption/discount form from your council's website
4Complete the form and attach the GP certificate and proof of qualifying benefit
5Submit to the council tax department (online, post, or in person)
6Council processes the application (2–4 weeks) and issues a revised bill

Qualifying benefits

The person with SMI must receive at least one of:

✓Attendance Allowance (higher or lower rate)
✓Disability Living Allowance (care component at any rate)
✓Personal Independence Payment (daily living component)
✓Constant Attendance Allowance
✓Universal Credit with limited capability for work-related activity element
✓Incapacity Benefit (long-term rate)
✓Employment and Support Allowance (support group component)

What the GP certificate involves

The GP must certify that the person has a 'severe impairment of intelligence and social functioning which appears to be permanent.' This is a clinical judgment, not a specific test score. Most GPs will issue the certificate if the patient has a diagnosis of dementia, severe learning disability, or significant brain injury. There should be no charge for the certificate, though some practices may charge a small admin fee (challenge this — it should be free as part of NHS care).

Backdating — claim what you are owed

SMI exemption can be backdated to the date the person first met the criteria — potentially years. If someone has had dementia and a qualifying benefit for three years but only applies now, the council must refund three years of council tax (or the relevant portion). There is no statutory time limit. Gather evidence of when the condition and qualifying benefit started.

Who qualifies as 'severely mentally impaired'?

The legal definition under the Local Government Finance Act 1992 is broad: a person has a severe mental impairment if they have 'a severe impairment of intelligence and social functioning (however caused) which appears to be permanent.' This covers Alzheimer's, vascular dementia, Parkinson's dementia, severe learning disabilities, brain injuries from accidents or strokes, and other permanent cognitive conditions. It does not require a specific IQ threshold or formal assessment.

Legal basis
Local Government Finance Act 1992, Schedule 1, Class U: a dwelling occupied only by one or more severely mentally impaired persons is exempt from council tax. Council Tax (Discount Disregards) Order 1992, Schedule 1, Paragraph 2: a severely mentally impaired person is disregarded for discount purposes.

Sources

Local Government Finance Act 1992, Schedule 1, Class U
Council Tax (Discount Disregards) Order 1992
Valuation Tribunal for England guidance

Frequently Asked Questions

Will the GP charge for the SMI certificate?: They should not. The certificate relates to NHS care and should be provided free. If your GP practice charges an admin fee, you can challenge this — many councils will accept a letter from the GP as an alternative.
What if the GP refuses to issue the certificate?: Ask for a referral to a specialist (neurologist, psychiatrist, or memory clinic) for a formal assessment. If the diagnosis is documented in medical records, the GP should not refuse. Consider writing a formal complaint to the practice manager.
Can I claim SMI exemption for a relative who lives alone?: Yes. A family member, carer, or power of attorney can apply on behalf of the person with SMI. You will need the GP certificate and proof of qualifying benefit.
Does SMI exemption affect other benefits?: No. The council tax exemption or discount does not affect entitlement to any other benefit. It is not counted as income.

council-tax-exemption
council-tax-reduction

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