Service Charge 18-Month Rule UK — Section 20B LTA 1985 and Irrecoverable Costs

The 18-Month Rule — What Section 20B LTA 1985 Says

Section 20B Landlord and Tenant Act 1985 provides: (1) Where a service charge is payable by a tenant by reference to costs incurred by a person in connection with matters that relate to the building or the tenant's flat, the charge is not payable unless the tenant is notified of the costs within 18 months of their being incurred. (2) Where the tenant is notified within 18 months of the costs being incurred, the service charge may still be demanded at any point thereafter (there is no separate time limit on the demand itself — the 18-month limit is on notification, not on the demand following notification). (3) The protective notice under s.20B(2) must: (a) be in writing; (b) inform the tenant that the costs have been incurred; and (c) state that they will be included in a service charge demand. The notice does not need to specify the precise amount — it can give an estimate or a range. However, it must be clear that the costs have actually been incurred (not merely expected or budgeted for). The 'incurring' of a cost: a cost is generally 'incurred' when the liability arises — i.e. when work is done and a valid invoice is raised by the contractor, not when the invoice is paid. A landlord who receives invoices in stages over a major works project must track the date of each invoice and ensure a protective notice is served within 18 months of each invoice date if the accounts will not be demanded within 18 months.

• 18-month clock starts when the cost is incurred — generally when a valid invoice is raised by the contractor (when the liability crystallises), not when the invoice is paid
• The protective notice must be in writing, inform the tenant that costs have been incurred, and state they will be included in a future service charge demand — no precise amount required
• No Tribunal discretion: the First-tier Tribunal has no power to waive the 18-month limit — if the notice is not served in time, the cost is irrecoverable regardless of how reasonable it was
• Single demand timing: where a protective notice is served in time, there is no further time limit on the service charge demand itself — the landlord can demand whenever the accounts are certified
• Staged invoicing: for major projects invoiced in stages, each invoice creates a separate 18-month clock; the landlord must track each invoice date and serve protective notices as needed

Common Scenarios Where the 18-Month Rule Bites

The 18-month rule most commonly causes problems in three scenarios. First, delayed certified accounts: a managing agent incurs costs in Year 1 but does not prepare and certify the service charge accounts until Year 3 (perhaps due to disputes with contractors, audit delays, or managing agent changes). By the time the certified accounts are issued, many costs are more than 18 months old and irrecoverable. This is particularly common where landlords change managing agents mid-way through a major works project — the incoming agent may not be aware of the 18-month exposure on costs incurred by the previous agent. Second, major works projects spanning more than 18 months: a major refurbishment project that takes 2 years to complete will have early costs (foundation works, surveys, scaffolding erection) that fall outside the 18-month window by the time the final account is issued. The landlord must serve protective notices as costs are incurred during the project, not just at the end. Third, retrospective recovery attempts: a landlord who was not managing the service charge accounts correctly during a lease, and who then attempts to recover historic costs on a lease renewal or sale, will find that any costs more than 18 months old (without a protective notice) are irrecoverable — even if the tenant is prepared to negotiate.

• Delayed accounts: the most common trap — accounts from Year 1 demanded in Year 3 are partially or wholly irrecoverable; protective notices must be served as costs are incurred
• Managing agent changes: incoming agents must audit historic cost incurrence dates; costs incurred before the change may already be approaching the 18-month limit
• Long major works projects: early-phase costs (surveys, scaffolding, groundworks) on a 2-year project may be more than 18 months old before the project is complete; serve protective notices in tranches
• Retrospective recovery: historic service charge costs cannot be recovered on a flat sale or lease renewal if more than 18 months have elapsed without a protective notice
• Insurance premiums: where the landlord pays insurance on behalf of tenants as a service charge item, the annual premium payment creates an 18-month clock from the payment date — typically straightforward if accounts are issued annually, but a risk if accounts are delayed

The Protective Notice — Content, Service, and Timing

A protective notice under s.20B(2) LTA 1985 does not need to be in a prescribed form, but it must satisfy the statutory requirements: (i) in writing; (ii) inform the tenant that the costs have been incurred; (iii) state that they will be included in a future service charge demand. Case law confirms that an over-general notice (e.g. 'we may incur costs in the future') does not qualify — the notice must relate to costs that have already been incurred. It does not need to be a formal document: a letter, an email (if the tenancy allows email service), or a notice attached to a interim service charge demand can all qualify, provided the content meets the statutory requirements. Service: the notice must be served on each qualifying tenant — if the building has 10 flats, 10 notices must be served. Service can be by hand, post, or email (depending on the lease service clause and the Landlord and Tenant Act 1987 s.48 requirements). Keep proof of service for every notice. The notice must be served within 18 months of the cost being incurred — not within 18 months of the landlord discovering the cost, or within 18 months of the invoice being paid. Best practice: managing agents should diary the 18-month notice deadline for every major cost item, and issue protective notices automatically for any item that will not be included in a service charge demand within 12 months of incurrence (giving 6 months' buffer).

• No prescribed form: the notice can be a letter or email; must state costs have been incurred and will be included in a future service charge demand
• Costs already incurred: a prospective notice ('we may incur costs') does not qualify — the notice must refer to costs that have actually been incurred by the date of service
• Serve on each tenant: a single block notice is insufficient; each qualifying tenant in the building must receive the notice individually
• Proof of service: retain proof of service for every protective notice — critical if the tenant later disputes the recovery in the First-tier Tribunal
• 12-month diary trigger: best practice is to issue a protective notice for any cost that has not been demanded within 12 months of incurrence — providing a 6-month buffer before the 18-month deadline

FTT Challenges and Landlord Defences

The First-tier Tribunal (Property Chamber) has jurisdiction to determine whether service charges are payable and, where the 18-month rule applies, must hold that costs incurred more than 18 months before demand (without a protective notice) are irrecoverable. A landlord facing a tenant's s.20B challenge has limited defences: (i) the cost was demanded within 18 months of incurrence — require the tenant to prove the invoice date; obtain the original contractor invoices and date-stamp records; (ii) a protective notice was served in time — produce proof of service; (iii) the cost was not actually 'incurred' until a later date — for complex projects, the liability crystallisation date may be later than the date of works (e.g. where there is a dispute with the contractor and the cost is not finally agreed until a formal settlement); (iv) the cost is a recurring annual charge (e.g. insurance, ground maintenance) that is recharged annually — where the demand pattern is regular and annual, the 18-month rule may be satisfied by the regularity of annual billing. Section 20C LTA 1985 interacts with s.20B: a tenant who successfully argues that service charge costs are irrecoverable under s.20B can also apply for a s.20C order preventing the landlord from recovering its legal costs of the proceedings as a service charge item — a double penalty for the landlord. Scotland: service charge legislation differs; the Tenements (Scotland) Act 2004 and the Deed of Conditions govern maintenance and service charges in Scottish flatted buildings; s.20B LTA 1985 does not apply in Scotland.

• No FTT discretion: if the s.20B limit is breached, the FTT must hold the cost irrecoverable — there is no judicial discretion to allow recovery on equitable grounds
• Liability crystallisation date: for disputed contractor costs resolved by settlement or adjudication, the liability crystallisation date (when the sum is finally agreed) may be later than the date of works — potentially extending the 18-month clock
• s.20C order: a successful s.20B challenge also opens the door to a s.20C order preventing the landlord from recovering the legal costs of the Tribunal proceedings as a service charge
• Annual recurring items: insurance premiums, ground maintenance, and other regularly billed items are usually straightforward — 18-month risk arises only if annual accounts are significantly delayed
• Scotland: s.20B LTA 1985 does not apply; Scottish flatted property service charges are governed by Tenements (Scotland) Act 2004 and Deed of Conditions

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