Remaining Annual Leave and Forfeiture – Which Rules and Deadlines Really Apply?

Hardly any topic in modern UK HR management has undergone such significant scrutiny and evolution in recent years as the forfeiture and carry-over of statutory annual leave entitlements. The rigid old assumption—"Use it or lose it at the end of the leave year"—no longer applies automatically without clear procedural compliance from the employer.

The Statutory Basis

Working Time Regulations 1998 (Regulations 13 & 13A) / EU Working Time Directive 2003/88/EC

Under UK law, workers are entitled to 5.6 weeks of paid statutory annual leave per leave year (28 days for a full-time worker working a 5-day week). This comprises 4 weeks of basic leave (Regulation 13, derived from EU Directive 2003/88/EC) and 1.6 weeks of additional leave (Regulation 13A). Generally, Regulation 13 leave must be taken in the leave year in respect of which it is due, whereas Regulation 13A leave may be carried over into the following leave year if a relevant workforce or employment agreement expressly provides for it.

Going strictly by the basic statutory wording, annual leave might appear to lapse automatically at the end of each leave year. However, landmark domestic and retained European case law—now codified in UK employment legislation—attaches a decisive prerequisite to forfeiture: the employer's proactive duty to facilitate and inform.

The Duty to Inform as a Condition for Forfeiture

In landmark judgments (notably Kreuziger v Land Berlin (C-619/16) and Max-Planck-Gesellschaft v Shimizu (C-684/16)), the European Court of Justice (ECJ) established that a worker does not automatically lose their statutory holiday entitlement unless the employer proves that it enabled and encouraged the worker to take the leave with full transparency.

Under the Working Time Regulations 1998 (as amended, including reforms implemented via the Employment Rights (Amendment, Revocation and Transitional Provision) Regulations 2023), basic statutory leave (Regulation 13) carries forward into the next leave year if the employer failed to:

• Recognise the worker's right to paid annual leave,
• Give the worker reasonable opportunity to take the leave, or
• Encourage the worker to take it and inform them that untaken leave will be lost at the end of the leave year.

To ensure compliance, the employer's notification must:

• be issued individually and directly – a generic intranet post, employee handbook clause, or staff room notice is insufficient,
• specifically quantify the worker's remaining outstanding leave balance,
• be provided in a timely manner, allowing the worker sufficient opportunity to schedule and take their leave before the year expires,
• explicitly state the consequences of forfeiture if the leave is not taken by the end of the leave year.

Statutory Limitations and Accumulated Leave Claims

Where an employer fails to meet its duty to facilitate leave or wrongly denies a worker paid holiday, the untaken leave entitlement carries over indefinitely until the end of the first full leave year in which the employer provides the proper opportunity and notice, or until the employment terminates.

Under established precedent (including King v The Sash Window Workshop Ltd and Smith v Pimlico Plumbers Ltd), workers who were denied the opportunity to take paid leave can claim compensation for accumulated untaken statutory leave upon the termination of their employment. Employers who fail to maintain robust holiday management and transparent notification procedures risk accumulating substantial unquantified holiday liabilities on their balance sheets.

Special Case: Long-Term Sickness

If a worker is unable to take their statutory annual leave due to sickness absence, different statutory carry-over rules apply:

• Regulation 13 Leave (4 weeks): If a worker cannot take this basic leave due to illness, they are entitled to carry it over into the following leave year. Under statutory UK rules and case law (Stringer v HMRC / Pereda), this carried-over leave must be taken within 18 months from the end of the leave year in which it accrued, after which it will lapse.
• Regulation 13A Leave (1.6 weeks): Additional statutory leave does not automatically carry over due to sickness unless an explicit contractual provision or workforce agreement allows for it.

Where an employee returns to work during the leave year with sufficient time remaining to take their accrued leave, the employer must proactively remind and enable them to do so before the leave year concludes.

Payment in Lieu upon Termination

Under Regulation 14 of the Working Time Regulations 1998, employers are prohibited from making a payment in lieu of statutory annual leave during the ongoing employment relationship. The only circumstance in which payment in lieu of statutory holiday is lawful is upon the termination of employment.

Upon termination, the employer must calculate and pay the worker for any accrued but untaken statutory leave (including any lawfully carried-over leave). This payment forms part of the final remuneration and must be calculated using the statutory week's pay rules under the Employment Rights Act 1996.

Sources and Legal Grounds

Statutes and Statutory Instruments

• Working Time Regulations 1998 (SI 1998/1833) — Regulations 13, 13A (Entitlement to annual leave), Regulation 14 (Compensation related to entitlement to leave), and Regulation 15 (Dates on which leave is taken)
• Employment Rights (Amendment, Revocation and Transitional Provision) Regulations 2023 — Codification of holiday carry-over rules, duty to inform, and irregular hours/part-year worker holiday reforms
• Employment Rights Act 1996 — Section 13 (Right not to suffer unauthorised deductions from wages) and Sections 221–224 (Calculation of a week's pay)
• Directive 2003/88/EC of the European Parliament and of the Council — Working Time Directive (Article 7: Annual leave)

Case Law Precedents

• Court of Appeal & Supreme Court / ECJ – King v The Sash Window Workshop Ltd [2017] (Case C-214/16) and Smith v Pimlico Plumbers Ltd [2022] EWCA Civ 70 — Employers must actively encourage and facilitate the taking of paid leave; failure to do so allows leave to accumulate and be claimed upon termination
• ECJ – Kreuziger v Land Berlin (Case C-619/16) and Max-Planck-Gesellschaft v Shimizu (Case C-684/16) [2018] — Annual leave does not lapse automatically unless the employer specifically informed the worker of their leave balance and the risk of forfeiture
• ECJ / House of Lords – Stringer & Others v HM Revenue and Customs [2009] (Case C-520/06) and Pereda v Madrid Movilidad SA (Case C-277/08) — Right to accrue annual leave during sick leave and carry over untaken entitlement (subject to the 18-month long-term sickness limitation period)

Status of legal evaluation: August 2026. This article is provided for informational and operational guidance purposes and does not constitute formal legal advice.