Council Tax When Your Spouse or Partner Has Dementia

The Standard Situation

You and your partner live together. One of you has been diagnosed with dementia — Alzheimer's, vascular, Lewy body, or another form. The diagnosis is devastating enough without discovering that you have been overpaying council tax, possibly for years.

If your partner qualifies for the severe mental impairment (SMI) disregard, they are removed from the council tax household count. That leaves you as the sole counted adult in the property, which triggers a 25% single-person discount. On a Band D property in 2026/27, that saves roughly £500 per year — and it can be backdated to when the conditions were first met, with no statutory time limit.

What Your Partner Needs to Qualify

Two conditions, both mandatory:

A medical certificate. A GP or consultant must certify that your partner has "a severe impairment of intelligence and social functioning which appears to be permanent." This is a statutory test under the Local Government Finance Act 1992. The certificate is completed on the council's own form and must be provided free of charge — any GP surgery quoting a fee is wrong under NHS regulations.

A qualifying benefit. Your partner must be entitled to at least one prescribed benefit. For older couples, this is most often Attendance Allowance (either rate). For younger couples, PIP daily living component (standard or enhanced) or Universal Credit with the LCWRA element. DLA care at the middle or highest rate, ESA with the support component, and several other benefits also qualify.

Both conditions must be met simultaneously. A dementia diagnosis alone is not enough — the qualifying benefit is the statutory second limb.

Why You Cannot Get a Bigger Discount as a Carer

Many spouses assume that because they provide round-the-clock care, they should qualify for the carer disregard — which would remove them from the headcount too, potentially taking the bill to zero. This is one of the most common misunderstandings in council tax.

The carer disregard under Schedule 1 of the Act excludes spouses and civil partners. It covers eligible live-in carers, including adult children caring for a parent, but not parents caring for a child under 18. A spouse caring for their partner, no matter how many hours of care they provide, cannot be disregarded under the carer provision.

In a two-person household where one partner qualifies for SMI, the maximum discount is 25%. The bill drops from 100% to 75%. No further reduction is available through the SMI or carer disregard route.

If the household is on a low income, a separate means-tested Council Tax Reduction through the local council's scheme may reduce the remaining 75% bill further. That is a different mechanism entirely and depends on income, savings, and the local scheme rules.

If Other People Live with You

The household headcount changes if anyone else lives at the property:

• Your partner (SMI) + you + an adult child — your partner is disregarded, but two counted adults remain (you and your child). No discount. Full bill.
• Your partner (SMI) + you + a qualifying live-in carer who is not a family member — your partner is disregarded under SMI. The live-in carer may be disregarded under the carer provision (if they provide 35+ hours/week care and are not a spouse or parent of a child). That leaves you as the sole counted adult. 25% discount.
• Your partner (SMI) + you + a full-time student child — your partner is disregarded under SMI. The student is disregarded under the student provision. You are the sole counted adult. 25% discount.

The composition of the household determines the outcome. The council assesses this based on who is registered at the address.

Backdating the Discount

The discount applies from the date when all conditions were first met: your partner lived at the property, the severe impairment had begun (as the doctor certifies on the certificate), and the qualifying benefit was in payment. The effective start date is the latest of these three dates.

There is no statutory time limit on backdating. If your partner's dementia began five years ago and they have been receiving Attendance Allowance for four years, the discount can be backdated four years — to when the benefit started, assuming the impairment was also present by that date.

Councils sometimes push back on claims older than a year or two, citing their own internal policies. These policies have no basis in primary legislation. If the council resists, a formal written grievance under Section 16 of the Act — followed if necessary by a free appeal to the Valuation Tribunal for England — consistently upholds the backdating.

When Your Partner Moves to a Care Home

If your partner permanently moves into a residential care, the SMI disregard at your home ends because they are no longer a resident. However, you may now qualify for the 25% single-person discount in your own right — as the sole remaining adult. And the property your partner left may qualify for a Class E exemption (unoccupied because the owner or tenant has moved to a care home), which gives 100% relief.

If your partner dies, a post-death SMI claim can still be lodged for the period before death, recovering overpaid council tax going back to when the conditions were first met. This is a claim against the estate, and any refund becomes an estate asset.

Our SMI Council Tax Exemption Guide walks through every couple and household scenario, with worked examples, calculation worksheets, and templates for backdating requests and appeals.

See more England guides →