Council tax single person discount: 25% off, how to claim it, and whether you're already missing out

Council tax assumes that two or more adults share a property. When only one adult lives there, the bill is reduced by 25%. The reduction:

• Applies whether you own or rent
• Applies to all council tax bands A through H
• Applies indefinitely, for as long as you remain the only adult in the property
• Is not income-dependent or means-tested

If your circumstances change, a partner moves in, an adult child returns home, you must notify your council promptly. Continuing to claim the discount when it no longer applies is treated as fraud.

This is where many people miss out, and where the rules are more generous than most people expect.

Council tax does not simply count every person living in a property. It counts "liable adults", and certain categories of person are disregarded when counting the number of adults. A disregarded person is essentially invisible for council tax purposes.

If you live with someone who is disregarded, you may qualify for the single person discount even though you are not literally living alone.

Categories of person who are disregarded:

• Full-time students on a qualifying course (not part-time, the course must be at least 21 hours per week for at least 24 weeks per year; verify at GOV.UK)
• Student nurses on placement
• Apprentices earning below a set threshold (verify at GOV.UK)
• Under-18s (they are never counted as adults)
• People with a severe mental impairment (SMI), a diagnosis alone is not enough; a formal SMI disregard requires a doctor's certificate and a qualifying benefit (see the exemptions guide)
• Care workers who live with the person they care for, where they are employed by a registered charity
• Carers providing substantial care for a disabled person (not a spouse or partner, and not a parent caring for a child under 18, specific rules apply; verify at GOV.UK)

The practical implication: If you live with a full-time student, the student is disregarded and you may qualify for the single person discount. If both people in a household have a severe mental impairment, you may qualify for full council tax exemption rather than just a discount. Check the exemptions guide for that scenario.

There is no national system for the single person discount. You apply directly to your local council.

Most councils have an online application form on their website. Search for your council's name plus "single person discount council tax", or go to the council homepage and look under council tax services.

You will be asked to declare that you are the only countable adult in the property. Some councils may ask for supporting information.

Annual reviews: Some councils send a yearly letter asking you to confirm your status still applies. If you receive one of these, respond promptly. Ignoring it can result in the discount being removed.

Automatic application: Some councils do apply the discount automatically when they receive information from electoral rolls or other sources. But you cannot rely on this. If you have not been told the discount is applied, assume it has not been and contact your council to check.

If you have been living alone and never applied, you may be owed a refund.

The backdating rules vary by council. Some councils will backdate indefinitely if you can demonstrate you have been the sole adult resident. Others will only backdate for a limited period. It is worth calling your council's billing team directly and asking how far back they will go.

Keep a note of when you moved in or when you became the sole occupant, that date is the basis of any backdating request.

You must notify your council if your circumstances change. The main changes that affect the single person discount:

• A partner or adult child moves into the property
• A lodger or flatmate moves in who is not in a disregarded category
• Someone in a disregarded category (for example, a student) changes their status

Failing to report a change can result in the discount being removed retrospectively, leaving you with a debt for the uncollected council tax. Some councils also issue fines.