Two Council Tax Bills for One Property With an Annexe: Who Pays and How to Reduce Them

Why You Get Two Bills

When the Valuation Office Agency (VOA) considers an annexe to be a self-contained unit — with its own sleeping, cooking, and bathroom facilities — it gets a separate entry in the valuation list. That means a separate council tax band and a separate bill.

This can be a shock. You bought one property, you live in one home, and now the council sends two demand notices every April. The main house might be in Band D and the annexe in Band A, and you are expected to pay both.

The two-bill situation is not a mistake. It is the automatic consequence of the VOA disaggregating the property into two chargeable dwellings under the Council Tax (Chargeable Dwellings) Order 1992.

Who Is Legally Liable for the Annexe Bill

Council tax liability follows a statutory hierarchy under Section 6 of the Local Government Finance Act 1992. The council applies this hierarchy separately to each dwelling — the main house and the annexe each have their own liable person.

If a relative lives in the annexe as a tenant or licensee, they are the primary liable person for the annexe bill. An adult child occupying the annexe sits at Level 3 or 4 in the hierarchy. However, they can claim the 50% family annexe reduction and, if they live alone, the 25% single person discount — cutting the bill by 62.5%.

If the annexe is unoccupied, liability falls to the non-resident owner — usually the person who owns the main house. They receive the annexe bill and are responsible for paying it unless a Class T exemption (planning restriction) or another exemption applies.

If a dependent relative lives there, they are technically liable, but if they qualify for a Class W exemption (aged 65+, severely mentally impaired, or substantially and permanently disabled), the bill is zero.

The Financial Impact — and How to Reduce It

A Band A annexe bill in 2026/27 ranges from roughly £1,000 to £1,800 depending on the council area. Without any reliefs, that is a significant addition to the household's council tax costs.

But very few family annexes need to pay the full amount. The statutory reliefs available are:

Class W exemption (100% off): The annexe is the sole or main residence of a dependent relative — bill drops to zero. Another adult living there does not, by itself, defeat the exemption.

50% family annexe reduction: Relative of any age lives there, or the space is used as part of the main home — bill halved.

Class T exemption (100% off): Annexe is empty and restricted by a planning condition — bill drops to zero.

Single person discount (25% off, stacks with the 50% reduction): One countable adult in the annexe — combined saving of 62.5%.

Can You Get Rid of the Second Bill Entirely?

Two routes:

De-banding through the VOA. If the annexe is no longer self-contained — the kitchen or bathroom has been permanently removed — you can ask the VOA to delete the separate band. The annexe ceases to be a separate dwelling and the second bill disappears. The risk is that the VOA may review and increase the main house band at the same time.

Exemption through the council. Class W and Class T both eliminate the bill without changing the banding. The annexe keeps its separate band but pays nothing. This is lower-risk than de-banding because it does not trigger a VOA review of the main property.

The Practical Reality

Most families with a separately banded annexe are better off claiming the appropriate council discount or exemption than trying to remove the band. A Class W exemption or Class T exemption eliminates the second bill entirely. Even the 50% reduction combined with the single person discount brings a Band A bill down to a few hundred pounds a year.

Our Annexe Discounts and Exemptions Guide walks through the decision path for working out which relief applies and how to claim it, with evidence checklists and template letters for each route.

See more England guides →