Carer Disregard and SMI: Council Tax Discounts and Class U

Two Disregards, One Household

The carer disregard and the severe mental impairment (SMI) disregard are separate provisions under different paragraphs of Schedule 1 of the Local Government Finance Act 1992. They can — and often do — apply to the same household.

The SMI disregard removes the person with a severe mental impairment from the adult count. It requires a medical certificate from a registered doctor confirming the impairment, plus receipt of a qualifying benefit (PIP, Attendance Allowance, DLA, ESA with support component, or UC with LCWRA). Spouses and partners are eligible for SMI disregard — there's no relationship exclusion.

The carer disregard removes the qualifying carer from the adult count. It requires 35 hours of weekly care, shared residence, the cared-for person receiving a qualifying benefit, and no spousal/partner relationship with the person receiving care.

When both apply in the same property, the effect depends on who else lives there.

The Three Common Dementia Scenarios

Scenario 1: Adult child caring for a parent with dementia (two-person household)

The parent has dementia, receives Attendance Allowance, and has a signed medical certificate — they qualify for SMI disregard. The adult child provides 35+ hours of care and lives at the property — they qualify for the carer disregard.

Both adults are disregarded, so no countable adults remain. The usual reduction is 50%. A carer disregard by itself does not make the property qualify for Class U, so the bill is not automatically reduced to £0.

This is the scenario that generates the largest savings. On a Band D property, the 50% discount is roughly £1,196 per year using the 2026/27 England average — and backdated over several years, the refund runs into thousands.

Scenario 2: Spouse caring for a partner with dementia (two-person household)

The person with dementia qualifies for SMI disregard — removed from the count. The spouse provides full-time care but is excluded from the carer disregard because of the partner exclusion. The spouse remains the only countable adult.

Result: 25% single person discount. Not 100% exemption, because one countable adult remains.

But if the spouse also qualifies for another disregard — for example, they're a full-time student, or they themselves have an SMI — then both adults are disregarded and Class U applies.

Scenario 3: Adult child plus parent with dementia plus one other adult

Parent is SMI-disregarded. Adult child is carer-disregarded. But a third adult — say, a sibling — also lives there and doesn't qualify for any disregard. One countable adult remains.

Result: 25% single person discount, not Class U.

What Class U Requires

Class U is defined in the Council Tax (Exempt Dwellings) Order 1992 (SI 1992/558). It applies when the property is occupied only by one or more people with SMI and any other residents meet the specific categories allowed by Class U, such as full-time students. A person does not qualify for Class U merely because they meet the carer disregard.

If every adult is disregarded but the Class U conditions are not met, the usual reduction is 50%. One countable adult remaining means the exemption does not apply and the household will generally receive a 25% single-person discount instead.

Applying for Both at the Same Time

You can apply for both disregards on the same contact with the council. Many councils have separate forms, but there's nothing stopping you from submitting both applications together and asking the council to apply whichever reliefs the household qualifies for.

For the SMI disregard, the council needs:

• A medical certificate from a registered doctor (not a nurse) confirming the severe mental impairment
• Evidence of a qualifying benefit

For the carer disregard, the council needs:

• A DWP award letter for the cared-for person's qualifying benefit
• A signed declaration of 35+ hours of care and non-partner status

If both are approved, the council should apply the appropriate discount or exemption automatically — check the revised demand notice to confirm the correct reduction, and that Class U is used only if its separate conditions are met.

Backdating Stacked Reliefs

Both disregards can be backdated. The backdating date is the later of:

• When the SMI medical certificate confirms the impairment began (doctors can certify retrospectively)
• When the qualifying benefit was first awarded
• When the carer moved in and began providing 35 hours of care

If the SMI certificate is dated from 2021 and the carer moved in during 2022, the stacked relief applies from 2022. The SMI disregard alone would apply from 2021; if one other countable adult remained in the property, the household would also qualify for the 25% single person discount.

This is the arithmetic that produced the widely reported £7,500 backdated refund on MoneySavingExpert — an adult daughter caring for a parent, with both SMI and carer disregard applied retrospectively to the daughter's 18th birthday.

The Council Tax Carer Disregard Guide includes worked household calculations for each of these scenarios and a step-by-step process for applying both disregards together.

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