Council Tax Dementia Refund: How Many Years Back in Scotland?

Scotland Has No Statutory Backdating Limit

Unlike some English councils that try to limit backdating to 12 months or the current financial year, Scotland's legislation imposes no upper time limit on backdating SMI disregards or Class 23 exemptions. Under Section 71 of the Local Government Finance Act 1992, council tax liability is calculated on a daily basis — and when entitlement to a disregard is established, the bill must be recalculated back to the date when all three statutory conditions first coincided.

If your parent was diagnosed with Alzheimer's in 2020, started receiving Attendance Allowance in 2019, and was living at the property since 2015, the backdating starts from 2020 — when the GP's certified impairment date and the benefit entitlement first overlapped at the same address. That's six years of overpaid council tax.

How the Backdating Date Is Calculated

Three dates determine how far back the refund reaches:

1. The GP's certified impairment date — the date the doctor certifies the person was (or is likely to have been) severely mentally impaired. This isn't the date you submit the form; it's the historical date the GP specifies. A good GP will certify the earliest date they can clinically justify.

2. The qualifying benefit start date — the date entitlement to a qualifying benefit began. For someone on a qualifying lower or higher rate of Attendance Allowance since 2019, that's the 2019 award date. If the benefit transitioned (DLA to SADLA, for example), the original DLA entitlement date counts as long as entitlement was continuous.

3. The date of residence — the date the person established sole or main residence at the property.

The backdating starts on whichever of these three dates came last. All three must overlap on the same day.

How Much Could the Refund Be?

The refund amount depends on the council tax band, whether the award is a full exemption or a percentage discount, and how many years are backdated.

For a Band D property in 2026/27, Council Tax rates range from about £1,468 to £1,816 across Scottish councils, with a Scotland average of about £1,653, before water and sewerage charges.

• Class 23 full exemption (dwelling occupied exclusively by SMI-disregarded persons): the refund is the full Council Tax charge for each eligible day.
• 25% discount (one SMI-disregarded person and one chargeable adult): at 2026/27 Band D rates, this is about £367–£454 per year on the Council Tax portion.
• 50% discount (all adults disregarded but no Class 23): at 2026/27 Band D rates, this is about £734–£908 per year on the Council Tax portion.

These annual figures are illustrative. For a multi-year refund, calculate the actual local charge for each eligible period; council rates vary by authority and change each April.

Water and sewerage charges are also removed where a Class 23 exemption applies. The 2026/27 unmetered Band D charge is £652.32; use the applicable rate for each year in a backdated claim.

What Councils Try to Do (and Why It's Wrong)

Some council revenues departments routinely try to limit backdating. Common tactics include:

• Telling you backdating is limited to the current financial year
• Claiming the refund can only go back to the date of application
• Requesting additional "evidence" for historical periods as a delay tactic
• Offering a shorter backdating period as a "compromise"

None of these have a statutory basis. If all three conditions — impairment, benefit, and residence — were met on an earlier date, the council is legally obliged to recalculate from that date. There is no discretion involved.

If a council refuses to backdate to the correct date, submit a formal Section 93 grievance under the Local Government Finance Act 1992. The council has two months to respond. If it refuses the grievance, appeal to the First-tier Tribunal for Scotland Local Taxation Chamber within two months of the refusal; if it does not respond within two months, the appeal window is four months from the date of the original grievance.

Gathering the Evidence for Maximum Backdating

The further back you want to claim, the more documentation you need:

• Historical benefit award letters from Social Security Scotland or the DWP, covering the entire period. Request duplicate letters if originals are lost.
• A GP certificate with the earliest possible certified date. Discuss with the doctor how far back they can clinically certify the impairment was present. Medical records, hospital discharge letters, and memory clinic referral dates can support an earlier certification.
• Proof of residence — council tax bills, utility bills, or electoral roll entries showing the person lived at the property throughout the claimed period.

Our Scotland SMI and Disability guide includes a backdating date reconstruction worksheet designed specifically for this exercise — it walks you through aligning the three statutory dates and identifying the earliest valid start point for your refund.

See more Scotland guides →