How to claim the 'severely mentally impaired' council tax discount

Who's eligible and what you need to know

How to claim the 'severely mentally impaired' council tax discount

Tens of thousands of 'severely mentally impaired' people who are entitled to a council tax discount could be missing out on about £400 a year.

We've been raising awareness of this since 2016, and the following year published a major report which found councils could be overcharging up to 100,000 people. This guide shows how to check if you're due the discount – and how to claim it.

In this guide

What is the 'severely mentally impaired' discount?

By law, to qualify, someone must be medically certified as being 'severely mentally impaired' – defined as having  "a severe impairment of intelligence and social functioning (however caused) which appears to be permanent". 

This is a medical diagnosis in itself, but the underlying cause could be a condition such as dementia (including Alzheimer's), severe learning difficulties, or something else. It's important to note that having an underlying condition does not automatically mean a person is 'severely mentally impaired' (SMI). 

If someone is diagnosed as SMI, they can be 'disregarded for council tax purposes' in England, Scotland and Wales – in a similar way that students are, for example. Who is eligible is explained in full below.

If you or someone you live with is diagnosed as SMI, this means you can claim:

  • A 100% discount – if you're diagnosed as SMI and live alone, you shouldn't be paying any council tax at all.
  • A 25% discount – if you live with someone who's SMI and no other adults, or only adults who have also been disregarded for council tax purposes, in effect you get a single person's discount. But when claiming, specify you require a discount because you are living with someone who is severely mentally impaired. 

No discount applies if you are diagnosed as SMI but you live with two or more adults who are eligible to pay council tax. As there are two or more full council-tax paying adults, they are not eligible for the single person's council tax discount.

To qualify for the reduction, not only does the person have to be medically certified as being SMI, but they also must be eligible for – but not necessarily actually receiving – at least one of a number of benefits (see full list), such as disability living allowance.

Warning: Some councils wrongly tell people they need to be receiving these benefits. That's not correct – the law simply says you need to be eligible for them.

We began raising awareness of SMI in 2016 and have seen many successes, such as Paul's. He said: "Thanks – with your guide, I just helped my parents claim back £2,400 council tax as dad has Parkinson's."

Yet many people have struggled to claim, such as Philip, who said: "My wife started receiving benefits for Parkinson's in 2001. My council originally told me that we didn't qualify as we had savings. However, it eventually admitted it had given us wrong information and we were given a 25% discount."

Not all people diagnosed with Parkinson's will necessarily qualify for this discount. See the next section in this guide for full info on who's eligible.

Who is eligible for the discount?

Both of the following must apply for someone who's severely mentally impaired to qualify for the council tax discount:

  • They've been medically certified as being severely mentally impaired. For example, this may be the case if they have dementia (including Alzheimer's), Parkinson's, severe learning difficulties or have had a stroke. It will depend on each individual’s case though and simply having been diagnosed doesn’t automatically mean they qualify - a doctor must also certify they are severely mentally impaired. GPs are not allowed to charge you for this certification.

  • They're eligible for (but NOT necessarily actually receiving) at least one of the following benefits:

    • Incapacity benefit
    • Attendance allowance
    • Severe disablement allowance
    • Disability living allowance (higher or middle-rate care component)
    • Increase in disablement pension (due to constant attendance being needed)
    • Unemployability supplement or allowance
    • Constant attendance allowance
    • Income support (which includes a disability premium)
    • Personal independence payment (standard or enhanced daily living component)
    • Armed forces independence payment

    • In England and Wales you can also be eligible for:

    • Disability working allowance (based on getting income support including disability premium)
    • Universal credit (including an element for limited capability for work or limited capability for work and work-related activity)

    • In Scotland you can also be eligible for:

    • Tax credits (including disability element)
    • Employment and support allowance
    • Universal credit

Remember, some councils wrongly tell people they need to be receiving these benefits. That's not correct – the law simply says you need to be eligible for them.

How to claim the discount

The process for making a claim varies by area, so you'll need to check your local authority's procedure. But here are the basics (for England, Scotland and Wales – for Northern Ireland see below):

  • Get a claim form from your council. You'll need to contact your local authority for a claim form to register for a council tax discount (find contact details via the Government's 'Apply for Council Tax Reduction' service).

  • Then, you'll need a doctor's diagnosis. A registered medical practitioner must have diagnosed you as severely mentally impaired. In some cases you'll need to attach a written diagnosis to your claim – in others you just give your doctor's details and they'll be contacted for confirmation. GPs are not allowed to charge you for this certification.

  • Fill the form in and send it off to your council. You may be asked to attach some supporting evidence, such as the doctor's diagnosis or evidence of eligibility for relevant benefits.

Procedures vary by council, so if you want to know how long it will take for the discount to be applied, it's best to check with yours.

Let us know how you've got on. Whether you've successfully claimed, or have tried to but had problems, tell us at

How to get a rebate if you've already overpaid

Here it gets a bit trickier – not all councils allow you to apply for a backdated discount, though we think they should. If your council does allow you to make a retrospective claim, here are the need-to-knows:

  • You'll need to write to your local authority explaining the circumstances. You'll need to do this separately, even if you're claiming for a reduction in future as well, though you can attach your rebate letter to the claim form.

  • You don't need to explain why you didn't apply for a reduction earlier. But you will need to prove the criteria for a discount applied at the relevant time in the past. We've heard from MoneySavers who have moved home over the years who have managed to reclaim overpayments from multiple councils.

    It's worth noting that different councils seem to have varying interpretations of the reclaim process, but the most common way of calculating when the reclaim should be backdated to seems to be based on when the person who is 'SMI' first started receiving a qualifying benefit.

  • If you lived with someone who's 'SMI' and who's since died, you may still be able to claim. You may be able to get a rebate on payments for the period when the person who was impaired lived with you. The process is the same, so you'll still need proof of the person's condition, such as a doctor's letter.

In Wales? It's now easier to get a discount

We've been banging the drum about the SMI discount for several years now, and in 2017 published our report The Disregarded Discount, outlining several changes that councils should make to the process for getting discounts and rebates.

As of April 2019, in a huge win for our campaign, the Welsh Government and all 22 Welsh local authorities have agreed to make every change called for in the reportThis means the application form for the discount will be standardised across the country, and backdating is to be allowed by EVERY council in a standardised way. Bravo Wales! 

The Welsh Government has a dedicated webpage, with details of the discount and how to claim, and a leaflet of the information (which also helps council call-handlers).

If you're in Wales and want to claim a discount, you need to:

  • Print the application form from the Welsh Government website. It can be found here.

  • Get a diagnosis (or get a diagnosis for the resident you wish to claim for). To be eligible, the person claiming the discount must be diagnosed as SMI by a doctor. There's a section for your doctor to fill in within the form. 

  • Send it to your council's tax office. You can find details for your council here.

The form will ask for a date of diagnosis, so if you're owed a backdated rebate, your application form will cover this.

In Northern Ireland? It works differently

Because there is the rates system in Northern Ireland, rather than council tax, every property is valued individually.

The only roughly-similar discount is the disabled person's allowance, which gives a 25% discount on rates for homes where a disabled person lives and the property has been adapted to suit their needs. See full info on the NIdirect website.


  • No - having this or any other medical condition does not automatically make you eligible for the discount. To be eligible for the discount, you need a specific SMI diagnosis from your doctor.

    The law says that a person is regarded as SMI, or ‘severely mentally impaired’, if they have ‘a severe impairment of intelligence and social functioning (however caused) which appears to be permanent’. 

    You can be diagnosed as SMI as a result of a range of conditions – which could include things like dementia, Schizophrenia, having had a stroke, or having had an accident which permanently affects your intelligence and social functioning.

    Many conditions can underlie being SMI, but no condition means a person is definitely also SMI. Being SMI is a doctor’s diagnosis in its own right. 

  • No, but the number of council tax paying adults you live with does affect the level of reduction you can receive.

    If you are diagnosed as SMI by a doctor, entitled to at least one of the applicable benefits for the discount, and  living alone or only with others who are SMI, you are exempt from paying council tax – you won’t have to pay anything at all.

    Alternatively, if you are diagnosed as SMI by a doctor, entitled to at least one of the applicable benefits for the discount, but live with one adult who is eligible to pay council tax, your household will receive a 25% reduction. This is because as you are exempt from paying council tax, the other inhabitant will qualify for the single person’s council tax discount.

    However, even if you have been diagnosed as SMI by a doctor and are entitled to at least one of the applicable benefits for the discount, but you live with two or more adults who are eligible to pay council tax, there will be no reduction. As there are two or more full council tax paying adults, they are not eligible for the single person’s council tax discount. 

  • No, your GP is not allowed to charge for a doctor’s certificate to support an SMI claim – British Medical Association regulations say they have to give these certificates free of charge. 

    While there isn't a similar rule for specialist consultants (eg, psychiatrists), as a general principle they don’t ask for a fee.

  • Not necessarily. While some councils do backdate, they are not legally obliged to – each council can decide their own policy.

    For example:

    • We’ve heard some councils do not backdate at all;
    • We’ve heard from several users that their council backdated the discount by six years;
    • We’ve also heard that many councils backdate to the point that the individual was receiving a certain benefit, such as attendance allowance.

    All the above approaches are legally permitted, as there is nothing in law which says a council has to have a particular backdating policy.

    However, following MSE campaigning, Wales has standardised its backdating process and all 22 Welsh local authorities backdate the SMI discount to when you were diagnosed as becoming SMI (note this could be prior to when the diagnosis is actually made). MSE wants the rest of the UK to take up this approach to backdating and is currently campaigning for this change. 

  • No. If your council has told you that you can only get the SMI discount if you've had adaptions to your home, or if you need to use a wheelchair indoors, it could have got confused with the Disabled Band Reduction Scheme. This is another discount for people who need extra space because of a disability.


  • No. If your council has told you that you can only get the SMI discount if you have less than a certain amount of savings - we've heard of cases where councils have said people can't have more than £16,000 of savings - they may have got confused with Council Tax Reduction Scheme (also known as Council Tax Support). This is a benefit to help pensioners on a low income or claiming certain benefits to pay their council tax.

  • A council call handler isn't able to diagnose you as SMI or not – only a registered medical practitioner can diagnose someone as SMI.

    You should direct your council to the Local Government and Finance Act 1992 (Schedule 1, Paragraph 2) which explains that only a registered medical practitioner can certify someone as SMI. 


  • Potentially, as the law allows each council to decide its own backdating policy. If you lived with someone who was SMI who's since died, or you are the executor to their will, you may be able to claim a rebate for the overpaid council tax - but this will depend on the policy of your local authority.


  • The most important thing when seeking to get an SMI diagnosis is to give your doctor the most accurate information, so they can make the best decision for you.

    However, if you think you have been wrongly refused an SMI diagnosis by your doctor, the charities Alzheimer’s UK and Rethinking Mental Health recommend a number of actions you can take. 

    If you regularly see another registered medical practitioner other than your GP – such as a consultant or psychiatrist – you can ask them for a diagnosis instead.

    You can also ask your GP to arrange a second opinion, either from a specialist or another GP. While it is worth asking, your GP doesn’t have to do this if they don’t think it’s necessary. If they refuse, and you still think you might qualify for a diagnosis, you may wish to change your GP.

  • Yes, depending on the policy of the local authority that you are applying to, you may still be able to claim for a previous address. If the local authority backdates to when you were diagnosed as first being SMI, you could get a rebate on payments for the period you lived in the previous address. However, each local authority has a different policy in regards to backdating.


  • This depends on the policy of the local authority – each council comes up with its own backdating policy. Not all councils will consider backdating, but it is worth gathering the required evidence and asking your local authority.

    Alzheimer’s UK advises claimants to send a covering letter with their discount applications to request that the discount be backdated.