Part of: UK Council Tax 2026 — Complete Guide → Council Tax When Moving House 2026
TL;DR: Taking a paying lodger into your home creates a second adult resident for Council Tax purposes, which typically ends your Single Person Discount. The lodger pays you rent; you pay Council Tax based on the new household composition. If the lodger falls into a disregarded category (full-time student, SMI, apprentice under threshold), you keep the SPD. Notify the billing council within 21 days of the lodger moving in.
Last reviewed: 27 April 2026
The Council Tax Position When You Take a Lodger
Under section 6 of the Local Government Finance Act 1992, the liable person for Council Tax is determined by the resident hierarchy at the property. The resident with the highest position in that hierarchy is the liable person.
When you take a paying lodger:
- You remain the resident owner (or resident tenant) - the liable person
- The lodger becomes a second adult resident - not the liable person, but counted for SPD purposes
The key impact: Single Person Discount ends. SPD requires that there is only one non-disregarded adult resident. A second adult (the lodger) typically ends your status as sole non-disregarded adult, removing the 25% SPD. Your bill increases from 75% to 100% of the standard charge.
Financial example: Annual charge at Band D in your council area: £2,280. With SPD (sole adult): £1,710/year. With lodger (full adult): £2,280/year. Net increase from taking the lodger (for Council Tax alone): £570/year.
The Disregarded Lodger Exception
Not all lodgers end the SPD. If your lodger falls into a disregarded category, they are not counted as a non-disregarded adult:
Full-time student lodger: Registered on a qualifying full-time course with a CT1 certificate from their institution. They are disregarded. Your SPD continues.
SMI lodger: Severely mentally impaired with GP certificate and qualifying benefit. They are disregarded. Your SPD continues.
Apprentice lodger below threshold: Earning under approximately £195/week gross on an approved training scheme. Disregarded. Your SPD continues.
Under-18 lodger: Disregarded under the standard under-18 rule. Your SPD continues.
Carer lodger: Where the lodger is a qualifying carer (providing 35+ hours/week of care to you or another resident), they may be disregarded. More complex - confirm with the billing council.
Where your lodger falls into a disregard category, notify the billing council with evidence of the disregarded status (CT1 certificate for students, etc.) and your SPD is preserved.
Notifying the Billing Council
Under Regulation 17 of the Council Tax (Administration and Enforcement) Regulations 1992, you must notify the billing council within 21 days of any change in household composition that affects your Council Tax liability.
When a lodger moves in:
- Notify the billing council via the online portal ("tell us about a change" or "update household composition")
- Provide the lodger's name and move-in date
- If the lodger is disregarded, provide evidence at the same time
Failure to notify within 21 days can result in a civil penalty and retrospective billing for the period where SPD was incorrectly claimed after the lodger moved in.
The Second Adult Rebate: An Alternative
If your lodger is not in a disregard category but has a low income, you may qualify for the Second Adult Rebate (SAR) instead:
SAR reduces your Council Tax bill based on the second adult's income - not your own. The second adult (your lodger) must have low income (typically receiving income-related benefits or earning below a threshold).
SAR reduction levels:
- Second adult receiving means-tested benefits: up to 25% SAR
- Second adult earning above means-tested benefit level: lower SAR percentages
You cannot claim both main CTR and SAR simultaneously for the same period - you receive whichever provides the greater reduction.
Important difference: SAR is based on the lodger's income level, not yours. Even if your own income is high, you may qualify for SAR if your lodger is on a low income.
The Rent a Room Scheme: Separate from Council Tax
HMRC's Rent a Room Scheme allows you to earn up to £7,500/year from letting furnished accommodation in your main home without paying income tax on that rental income. This is a significant tax relief for landlords taking lodgers.
This tax relief is completely separate from Council Tax. The Rent a Room Scheme does not affect your Council Tax liability, your SPD eligibility, or any Council Tax discount. The two regimes are independent:
- Council Tax: based on who lives at the property
- Rent a Room Scheme: based on rental income you receive
The HMO Question: Multiple Lodgers
The Housing Act 2004 defines Houses in Multiple Occupation (HMOs) as properties occupied by three or more people from more than one household, sharing facilities (bathroom or kitchen).
If you live in your property and take multiple lodgers, the total number of unrelated adults may trigger HMO status. The Council Tax implications of HMO classification:
Standard HMO (landlord absent): Billing council typically treats the whole property as a single Council Tax dwelling with the landlord as the liable person, not the individual occupants.
Owner-occupied HMO (you live there with lodgers): More complex. You remain the resident owner (highest in the liability hierarchy). The billing council may treat it as a single household with you as the liable person. Some billing councils apply specific rules under section 8 of the Local Government Finance Act 1992 for owner-occupied properties with lodgers.
If your lodger arrangement grows to three or more unrelated people, contact the billing council for guidance on how they treat owner-occupied HMOs for Council Tax purposes.
The Airbnb and Short-Term Let Question
Taking an Airbnb guest for a few nights is not the same as having a lodger for Council Tax purposes:
Short-term guests (under 3-6 months): They are not resident at your property in the Council Tax sense. They have their own main residence elsewhere. Their brief stay does not make them a "resident" for SPD purposes. Your SPD is unaffected.
Longer-term Airbnb stays: If a person stays for an extended period (months) and establishes your property as their main residence, they may become a non-disregarded adult for Council Tax purposes. This is fact-specific and depends on length of stay, whether they have another main home, and other indicators of residence.
For typical holiday letting (a few days to a few weeks), SPD is unaffected. For very long Airbnb bookings, discuss with your billing council.
When the Lodger Leaves
When your lodger moves out and you return to being the sole adult:
1. Notify the billing council within 21 days of the lodger's move-out date.
2. Apply for the Single Person Discount to be reinstated from the move-out date.
3. The billing council typically backdates the SPD to the date of the lodger's departure.
Provide the lodger's move-out date and, if needed, evidence (email correspondence, return of keys, etc.).
Frequently Asked Questions
I'm a homeowner taking my first lodger - do I need to tell the billing council before they move in?
Notify the billing council within 21 days of the lodger moving in. You do not need to notify in advance of the move-in - the 21-day window begins from the lodger's actual move-in date. If the lodger is a full-time student with a CT1 certificate from their institution, provide it at the same time you notify, so that the SPD can be preserved immediately.
My lodger is a full-time student - do I still pay the full Council Tax rate with them in the house?
No. A full-time student lodger is disregarded for Council Tax. You remain the sole non-disregarded adult in the property. Your Single Person Discount (25% off) continues unchanged. Provide the billing council with the student's CT1 certificate when you notify them of the lodger's presence.
I'm taking a lodger who's on Universal Credit and has very low income - can I claim any reduction?
Apply for the Second Adult Rebate. SAR is based on the second adult's income (your lodger's income), not yours. A lodger on Universal Credit typically qualifies the account holder for the maximum 25% SAR. Apply to the billing council with evidence of the lodger's income or UC status.
My lodger is moving out - when can I start claiming SPD again?
From the date the lodger vacated the property (returned their key and removed their belongings). Notify the billing council with this date. SPD is backdated to the move-out date. Provide evidence if requested.
I have two lodgers plus myself - does HMO licensing change my Council Tax position?
Possibly. Three unrelated adults sharing your property (you plus two lodgers) may trigger HMO licensing requirements under the Housing Act 2004 depending on your local council's licensing threshold. Contact your local planning or housing team about HMO licensing obligations separately. For Council Tax, contact the billing council to understand how they treat owner-occupied HMOs in your specific situation - treatment varies between councils and depends on whether the property is assessed as a single dwelling or multiple units.
How we verified this
The resident liability hierarchy (including lodgers as second residents) is from section 6 of the Local Government Finance Act 1992. Section 8 of the same Act covers HMO Council Tax provisions. The 21-day notification duty is from Regulation 17 of the Council Tax (Administration and Enforcement) Regulations 1992. HMRC's Rent a Room Scheme (£7,500 tax-free) is from HMRC published guidance. The Housing Act 2004 governs HMO definition and licensing. MHCLG guidance covers lodger and HMO Council Tax administration. The IRRV provides professional guidance on SPD and second adult situations.
Sources & Verification
- Local Government Finance Act 1992 (s6, s8): https://www.legislation.gov.uk/ukpga/1992/14/contents
- Housing Act 2004 (HMO definition): https://www.legislation.gov.uk/ukpga/2004/34/contents
- Council Tax (Administration and Enforcement) Regulations 1992 (Reg 17): https://www.legislation.gov.uk/uksi/1992/613/contents
- HMRC Rent a Room Scheme: https://www.gov.uk/rent-room-in-your-home/the-rent-a-room-scheme
- gov.uk Council Tax lodgers: https://www.gov.uk/council-tax/who-has-to-pay
- MHCLG Council Tax guidance: https://www.gov.uk/government/collections/council-tax-statistics
- IRRV (Institute of Revenues, Rating and Valuation): https://www.irrv.net/
This article is for informational purposes only and does not constitute legal, financial, or tax advice. Council Tax rules vary by local authority and change annually. Always verify current rates and rules with your local council and gov.uk before making any decision.
