One of the more material changes to the council tax framework in recent years is the reform of how houses in multiple occupation are banded. From 1 December 2023, an HMO in England is treated as a single dwelling for council tax purposes, regardless of internal layout. The previous Valuation Office Agency practice of disaggregating HMOs into multiple separately-banded room-level dwellings (with each let-room with an ensuite and a kitchenette becoming its own Band A entry) ended at that date. This page walks the statutory mechanic, the HMO definition that applies, who is liable, the retrospective review route for pre-reform bandings, and the practical position for landlords and tenants in 2026.

The statutory mechanic

The reform sits in the Council Tax (Chargeable Dwellings and Liability for Owners) (Amendment) (England) Regulations 2023 (SI 2023/1175). Regulation 1(2) puts the instrument in force from 1 December 2023. Regulation 2 amends the Council Tax (Chargeable Dwellings) Order 1992 (SI 1992/549) by:

  • Inserting a definition of HMO into the interpretation provisions, with the meaning given by section 254 of the Housing Act 2004.
  • Inserting a new article 3C: an HMO must be treated as a single dwelling for council tax purposes.
  • Amending article 4(1) to begin "Subject to article 3C..." so that the new single-dwelling rule overrides the prior disaggregation framework.

Regulation 3 of SI 2023/1175 amends the Council Tax (Liability for Owners) Regulations 1992 (SI 1992/551) to update Class C so that the owner-liability rule and the new single-dwelling banding rule operate as a coherent regime. The combined effect is that an HMO has one council tax band and one bill, and the owner pays the bill.

The HMO definition: s.254, not s.61

The single most important point about the reform is which HMO definition it uses. SI 2023/1175 uses section 254 of the Housing Act 2004, which is the broad council-tax-and-housing-policy HMO definition. A building (or self-contained flat) is an HMO under s.254 if it is occupied by:

  • Three or more persons,
  • Forming two or more households,
  • Sharing one or more basic amenities (kitchen, bathroom, toilet).

OR if it satisfies the building-type test, the converted-blocks-of-flats test, or the s.55 prescribed-description test. The point to grasp is that the s.254 definition is broader than the s.61 mandatory-licensing definition (which requires five or more persons in two or more households, plus that the property falls within the s.55 prescribed description for mandatory licensing). A three-person, two-household shared house, well below the mandatory-licensing threshold, is an HMO for council tax purposes.

This catches many landlords by surprise. The working assumption from 2018 onwards (when mandatory licensing was extended) was that "HMO" generally meant "licensable HMO". For council tax, the s.254 broader test governs and the licensable / non-licensable distinction is irrelevant.

Who pays the bill

The owner. Class C of Schedule 2 to SI 1992/551 made HMOs owner-liable from 1993 onwards, and SI 2023/1175 reg 3 aligned the Class C definition with the s.254 meaning to produce a coherent regime. The post-reform position is:

  • The HMO is one dwelling under SI 1992/549 art 3C.
  • The owner is liable for the one council tax bill on that dwelling under SI 1992/551 reg 2 and Class C.
  • Individual tenants do not receive per-room council tax bills.

Landlords typically recover the cost via inclusive-rent or service-charge pass-through. The pre-reform model where individual tenants were sometimes liable for separately-banded room bills no longer applies. Tenancy agreements granted after 1 December 2023 should reflect the single-dwelling owner-pays position.

The pre-reform per-room banding practice

The background to the reform was a VOA practice that developed between roughly 2020 and 2023. Where an HMO had been refurbished to a high specification with ensuite bedrooms and bedroom-kitchenettes, the VOA had increasingly applied a disaggregation analysis under SI 1992/549 article 3 (the standard rule before the SI 2023/1175 override), treating each ensuite-and-kitchenette room as a separately-banded dwelling. The result was multiple Band A entries on the valuation list instead of one combined band.

For a 5-bedroom shared-house HMO in Manchester pre-reform, a per-room banding produced 5 separate Band A entries at roughly 1,400 pounds each, for an aggregate council tax bill of about 7,000 pounds annually. Post-reform, the same HMO is banded as a single Band C dwelling at roughly 2,100 pounds, a saving of about 4,900 pounds per year. In high-value London zones with high-spec HMOs, the savings under the reform have been materially larger.

The practice produced widespread complaint from both landlords and tenants. Landlords objected because the aggregate per-room council tax often exceeded what would have been the single-dwelling band. Tenants objected because in some cases they had become directly liable in their own name (where the VOA's per-room band was issued to the room and the room was a tenancy unit). The Department for Levelling Up, Housing and Communities (DLUHC, now the Ministry of Housing, Communities and Local Government, MHCLG) consulted on the reform in 2023 and laid SI 2023/1175 on 6 November 2023 with commencement on 1 December 2023.

The retrospective review route

The reform applies prospectively from 1 December 2023. Pre-existing per-room bandings remain on the valuation list until reviewed. Both landlords and tenants holding per-room banding decisions from 2020 to 2023 can apply to the VOA to have the list entry reviewed under article 6 of SI 1992/549 (the challenge process).

The procedural steps are:

  1. Confirm that the property meets the s.254 HMO test on the relevant date.
  2. Submit a Challenge of the list entry to the VOA under article 6 of SI 1992/549. The Challenge form is available on the gov.uk Check, challenge, appeal council tax band service.
  3. The VOA reviews the entry. Where the VOA accepts that the property is an HMO within s.254 and that the single-dwelling rule applies from 1 December 2023, the list is amended to a single-dwelling banding.
  4. The billing authority refunds or credits overpaid council tax for the period from 1 December 2023 to the date of the amended list entry.

The VOA has been processing a substantial backlog of these retrospective review applications since early 2024. Check the current VOA practice-note for any operational guidance and the typical processing times.

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The boundary case: HMO vs building of self-contained flats

The most-contested line under the new regime is between (a) an HMO with ensuite-bedroom-and-kitchenette rooms (single dwelling under art 3C) and (b) a building of self-contained flats (multiple dwellings under standard art 3). The s.254 definition expressly excludes a building of self-contained flats in some cases under s.254(8), and a building where each unit has a full self-contained kitchen and bathroom is typically not an HMO under the standard test.

The practical test the VOA applies turns on:

  • Whether each room has independent cooking facilities sufficient for daily living (a full kitchen, not just a kettle-and-microwave kitchenette).
  • Whether each room has independent bathroom facilities (a full bathroom, not just an ensuite shower).
  • Whether the building was originally constructed as multiple self-contained units or has been converted to that standard.
  • Whether the units have separate entrances, separate utility connections, and separate postal addresses.

An HMO with high-spec ensuite-bedroom-and-kitchenette rooms typically remains an HMO under s.254 (and therefore a single dwelling under art 3C) because the rooms share an aspect of the building's amenity (typically the main kitchen or a common area). A building of fully self-contained flats with separate kitchens, bathrooms, and entrances is typically not an HMO and remains separately banded.

The line is fact-specific. The VOA has been issuing practice-notes on the topic since the reform commenced. Where a property is on the boundary, the review process is the route to confirm the correct classification.

Devolved positions: Scotland and Wales

SI 2023/1175 is an England-only instrument. The reform does not apply to Scotland or Wales.

  • Scotland: council tax HMO classification is governed by the Council Tax (Discounts) (Scotland) Order 1992 and the Council Tax (Dwellings) (Scotland) Regulations 1997 framework, which operates differently from the English regime. Check the current Scottish Government policy position before assuming any read-across.
  • Wales: council tax HMO classification is governed by the Council Tax (Chargeable Dwellings) (Wales) Regulations 1992 and Welsh Government policy. The Welsh framework has its own discount and exemption architecture.
  • Northern Ireland: there is no council tax in Northern Ireland. Domestic rates apply under a separate Northern Ireland statute, which has its own HMO and shared-property classification framework.

HMO landlords with portfolios across the four UK jurisdictions need to run the council tax (or rates) analysis separately under each jurisdiction's regime.

The interaction with HMO licensing and planning

Three different statutory HMO definitions operate across three different regimes. The council tax single-dwelling rule under SI 2023/1175 uses s.254. The mandatory-licensing regime under HA 2004 s.55 and s.61 uses a narrower test. The planning Class C4 use-class regime under the Use Classes Order 1987 uses yet another test (3 to 6 unrelated occupants for Class C4; sui generis for larger HMOs).

A small three-person two-household HMO is within the council tax single-dwelling rule (s.254 satisfied) but is not within mandatory licensing (s.61 needs 5+) and is within Class C4 use. A six-person HMO is within the council tax rule, may be within mandatory licensing depending on whether it is in a designated area, and may be Class C4 or sui generis depending on local plan policy.

For licensing-side compliance, see our HMO licensing mechanics page. For HMO income tax and accounting, see our HMO tax guide and our HMO landlord accounting page. For incorporation of an HMO portfolio, see our HMO incorporation page. The council tax single-dwelling rule sits alongside those workstreams as a separate but related compliance line.

What to do now

For an HMO landlord with a property within s.254, the working sequence is:

  1. Confirm whether the property is an HMO under s.254 (3+ persons, 2+ households, shared amenity). If yes, the single-dwelling rule applies from 1 December 2023.
  2. Check the current valuation list entry for the property. If the entry is at single-dwelling level, no action is needed. If the entry is at per-room level from before 1 December 2023, submit an article 6 challenge to the VOA.
  3. If a per-room banding from 2020 to 2023 is still in effect, the review will typically produce a list amendment to single-dwelling banding effective from 1 December 2023, with a corresponding refund of overpaid council tax from that date.
  4. Update tenancy agreements and rent quoting to reflect the post-reform owner-pays single-bill position. Inclusive-rent pricing is the most common model for shared-house HMOs targeted at young professionals or students.
  5. Where all occupants are full-time students, claim the Class N exemption under SI 1992/558. The single-dwelling banding under art 3C means Class N applies to the whole dwelling, taking the council tax bill to zero.

For HMO tenants, the practical position is that you do not pay council tax separately under the post-reform regime. If you have a per-room council tax bill in your name from before 1 December 2023, the review should produce a refund from that date.

If you have an HMO portfolio, a single HMO with a live council tax issue, or a tenancy where the council tax position is unclear, the form at the foot of the page is the route to a structured assessment. Property Tax Partners works across the HMO income tax, council tax, licensing, capital allowances, and incorporation frameworks, which matters where multiple compliance lines run on the same property.