Holiday entitlement is a statutory right for almost all workers in the UK, governed by the Working Time Regulations 1998. Employees working a standard five-day week are entitled to a minimum of 5.6 weeks of paid annual leave, equivalent to 28 days. This statutory minimum applies to full-time and part-time workers, agency workers, those on zero-hours contracts, and workers with irregular hours, though the calculation method varies by working pattern. Employers may offer contractual leave above this minimum, but they cannot offer less. The rules around how leave accrues, how it interacts with sickness and parental leave, how it is calculated for variable-hours workers, and what happens to untaken leave at the end of employment are detailed and specific. Understanding them correctly protects employees from having entitlements overlooked and protects employers from tribunal claims and regulatory liability.
A Practical Guide to Holiday Entitlement
Annual leave is one of the most commonly misunderstood areas of employment law, not because the principles are particularly complex, but because the details matter and there are several points where the rules diverge from common assumptions.
The questions that come up most frequently are practical ones: how much leave does a part-time worker get, what happens if an employee falls ill during their holiday, can unused leave be carried into the next year, and how is holiday pay calculated for someone whose hours change week to week. This guide addresses each of those questions in sequence.
The Statutory Entitlement
The baseline entitlement under the Working Time Regulations is 5.6 weeks of paid leave per year. For an employee working five days a week, that produces 28 days. The 28-day figure is typically understood to comprise four weeks under the EU Working Time Directive and an additional 1.6 weeks under UK domestic law.
Employers can choose to include bank and public holidays, typically eight in England and Wales, within the 28-day statutory minimum. If they do, the employee has 20 days of flexible leave to book at their discretion, plus 8 days designated for bank holidays. Alternatively, employers can provide bank holidays on top of the 28-day minimum, effectively giving employees 36 days of paid leave in total.
There is no statutory right to have bank holidays off. Employers in sectors that operate on those days, including retail, hospitality, and healthcare, can require employees to work them. Those employees still receive their full 28-day statutory entitlement, but it is taken at other times.
Where an employer offers contractual leave in excess of the statutory minimum, the additional days are governed by the employment contract rather than the Working Time Regulations. The employer may impose conditions on those extra days, such as restricting when they can be taken or whether they carry over at year’s end, provided those conditions are clearly set out in the contract.
Part-Time Workers and Pro Rata Calculations
Part-time workers are entitled to the same 5.6 weeks of annual leave as full-time workers. Because they work fewer days, the 5.6 weeks translates to fewer days in absolute terms, but the proportion of working time represented by their leave entitlement is identical.
The calculation is straightforward: multiply the number of days worked per week by 5.6. An employee working three days a week is entitled to 16.8 days of annual leave. An employee working four days a week is entitled to 22.4 days.
Where the calculation produces a fraction, the employer cannot round down. The employee is entitled to take the fractional day, or, more commonly, the entitlement is rounded up to the nearest half or whole day. Rounding down would result in the employee receiving less than their statutory minimum.
The same proportionality principle applies to workers whose hours are measured in hours rather than days. For these workers, the entitlement is calculated in hours rather than days, using the same 5.6-week multiplier applied to the number of hours worked per week.
Variable Hours and Irregular Workers
Workers without a fixed pattern of hours present a more complex calculation challenge, but the principle remains the same: they are entitled to 5.6 weeks of paid leave, and that leave should reflect their actual average earnings.
For workers with irregular hours, the FLSA in the US and the Working Time Regulations in the UK both provide reference-period calculations. In the UK, holiday pay for irregular hours workers is calculated using a 52-week reference period. The employer looks back over the 52 weeks preceding the leave, counting only weeks in which the worker actually worked and earned pay, and calculates average weekly earnings across that period. That average is the basis for the holiday pay rate.
From April 2024, UK law updated the rules on rolled-up holiday pay for irregular hours workers and part-year workers. Under the updated rules, employers may calculate and pay holiday pay as 12.07% of total pay earned in each pay period, rather than paying at the time leave is taken. This percentage reflects the proportion of working time that is 5.6 weeks of leave, relative to the remaining 46.4 weeks of the year. If an employer uses rolled-up holiday pay, it must be itemised clearly on the worker’s payslip. This change simplifies administration for employers managing large numbers of variable-hours staff, while ensuring those workers receive their entitlements transparently.
Requesting and Refusing Leave
The Working Time Regulations set default rules for notice periods where employers do not have a contractual leave policy. To take leave of a given length, an employee must give notice at least twice the requested leave. To take one week off, two weeks’ notice is required. To take two weeks off, four weeks’ notice is required.
Many employers have their own policies that specify how leave should be requested, how far in advance bookings must be made, and how competing requests are prioritised. Where such policies exist, they govern the process in place of the statutory defaults.
Employers can refuse a leave request. A refusal is permissible where there is a legitimate business reason, such as operational requirements during a peak period or insufficient staffing cover. Where an employer refuses, they must give notice equivalent to the length of the leave that was requested, before the period during which the leave was proposed to start. If an employee requests two weeks off, the employer must communicate the refusal at least two weeks before the proposed start date.
Employers cannot refuse to allow an employee to take their statutory entitlement at all during the leave year. While they can decline specific requests, they must provide reasonable opportunities for all statutory leave to be taken. An employer who systematically blocks leave without providing alternative opportunities to take it is in breach of the Working Time Regulations.
Leave Accrual During Sickness
Annual leave continues to accrue during periods of sickness absence. An employee who is off sick for several months still builds up their full holiday entitlement during that period, even if they are receiving Statutory Sick Pay rather than their normal salary. This applies regardless of the length of the sickness absence.
Where an employee falls ill during a period of pre-booked annual leave, they are entitled to convert those days into sick leave, provided they follow their employer’s normal sickness reporting procedures. The annual leave days can then be rescheduled for later use when the employee is well. This right prevents employees from losing their holiday entitlement due to illness beyond their control.
Conversely, an employee on sick leave who has exhausted their sick pay entitlement may request to use accrued annual leave to maintain their full income during the remaining period of absence. The employer cannot unreasonably refuse this.
Leave Accrual During Parental Leave
Holiday entitlement accrues in full during maternity leave, paternity leave, adoption leave, and shared parental leave, in the same way as it would during ordinary employment. The period of leave does not reduce the annual leave entitlement for that year.
Because annual leave and statutory parental leave cannot be taken simultaneously, employees returning from parental leave often have a significant bank of accrued leave awaiting them. Many employees choose to book accrued annual leave at the end of their parental leave period, effectively extending their time away from work before returning. Employers should plan for this in their leave management processes and cannot refuse to allow employees to use leave that has genuinely accrued during parental absence.
Carrying Over Unused Leave
The rules for carrying over unused annual leave at the end of the leave year depend on which portion of the entitlement is involved.
The core four weeks of leave derived from EU law are generally subject to a use-it-or-lose-it principle. They must be taken within the current leave year and cannot be carried forward unless the employee was unable to take them due to circumstances beyond their control.
The additional 1.6 weeks of UK statutory leave can be carried over by written agreement between the employer and the employee. Where no such agreement exists, it is also lost at the end of the year.
Contractual leave above the 28-day statutory minimum may be carried over if the employment contract permits. Where the contract is silent or restrictive, unused days may be forfeited.
The exceptions to the use-it-or-lose-it rule are significant. Where an employee was unable to take their statutory leave because of long-term sickness absence, they may carry it forward for up to 18 months from the end of the leave year in which it accrued. Where leave could not be taken due to statutory parental leave, the full statutory entitlement can be carried over into the following year. Employers should not treat these exceptions as discretionary; they are legal requirements.
Holiday Entitlement on Leaving Employment
When an employee leaves, their final pay must account for any unused holiday entitlement accrued up to the date of leaving.
The calculation works as follows. First, identify what proportion of the leave year the employee worked. An employee leaving exactly halfway through the leave year has accrued 50% of their annual entitlement. Multiply the total annual entitlement by that proportion to establish the number of days accrued. Subtract any leave already taken. The balance is paid at the employee’s standard daily holiday pay rate.
If an employee has taken more leave than they had accrued at the point of leaving, the employer may deduct the value of the over-taken leave from the final pay packet, provided the employment contract includes a clause permitting this deduction. Without a contractual basis for the deduction, the employer cannot recover the overpayment from final pay.
Where an employee wishes to take their remaining holiday during their notice period, the normal rules apply. The employer can agree or, with the correct statutory notice, refuse. An employer can also require an employee to take their remaining leave during the notice period, thereby shortening the active employment period without reducing the total notice period.
Employer Obligations
For employers, holiday entitlement is not simply an administrative matter. Failure to allow employees to take their statutory leave, miscalculating holiday pay for irregular-hours workers, or failing to correctly account for leave accrual during sickness and parental leave all expose the business to employment tribunal claims.
Maintaining accurate leave records throughout the year, tracking accrual for all categories of workers, including variable-hours staff, and ensuring that leave policies are clearly documented in employment contracts are the practical foundations of compliance. Proactively communicating leave balances to employees and creating reasonable opportunities to take leave throughout the year, rather than allowing large balances to accumulate, reduces both the risk of year-end administrative pressure and the likelihood of enforcement action.
The Employment Appeal Tribunal and Court of Justice of the European Union have both issued significant rulings on holiday pay in recent years, particularly regarding what must be included in the holiday pay calculation. Employers should ensure that holiday pay reflects normal remuneration rather than basic salary alone, where employees regularly receive additional elements such as overtime, commission, or allowances as part of their normal pay.
A Right Worth Understanding
Holiday entitlement is one of the most universally applicable employment rights in the UK. It touches every worker and every employer, regardless of sector or workforce size. The rules are detailed enough that mistakes are common, but clear enough that, with the right understanding, compliance is entirely achievable.
For employees, knowing their entitlements, how they accrue, and how they interact with illness and parental leave means being able to take the leave they are genuinely owed. For employers and payroll professionals, understanding the calculation requirements and the circumstances in which the standard rules are modified by statute ensures that the right amounts are paid and that leave records accurately reflect the true position.
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