Employees can request to use paid annual leave while they're sick, but employers can't force them to do so. UK workers generally receive 5.6 weeks of statutory paid holiday, capped at 28 days for a five-day working week, and that entitlement continues to accrue during sickness.
Why do many absence policies treat “holiday” and “sickness” as mutually exclusive? That assumption creates an operational problem. A worker may remain medically unfit for work while choosing to take approved annual leave for a particular period. HR must then preserve the original sickness record, apply the correct pay treatment, and avoid turning a voluntary choice into an employer instruction.
For UK organisations, using annual leave for sick leave is therefore less about choosing one label and more about managing two connected records accurately. The safest approach is clear employee consent, defined approval steps, linked transactions, and an auditable return to sickness absence.
Table of Contents
- Can You Use Annual Leave While On Sick Leave
- Legal Framework and Worker Rights
- Absence Recording and Pay Calculations
- Policy Approaches for Employers
- Practical Scenarios and Applications
- Building a Compliant Absence Management Policy
- Implementation and Technology Support
Can You Use Annual Leave While On Sick Leave
Yes. A worker can ask to take annual leave during sickness absence, but the employer cannot require it. Sickness absence remains an illness-related absence, while annual leave is paid time off requested by the worker. The two records can sit next to each other without becoming the same record.
UK workers generally have a statutory entitlement to 5.6 weeks of paid annual leave each year, capped at 28 days for employees working a five-day week. Holiday continues to accrue during sickness, including long-term sickness, so an absence does not stop the holiday calculation. These rules are set out in UK government guidance on holiday entitlement during different types of contract.
Practical rule: A holiday request during sickness must come from the worker. A manager may approve or decline it under the organisation's normal process, but shouldn't pressure the employee to use holiday.
The distinction affects pay, entitlement and records. Approved annual leave generally follows the applicable holiday-pay rules, while sickness may involve Statutory Sick Pay or another contractual sick-pay arrangement. HR shouldn't automatically convert sickness days into holiday just because the worker would receive a different payment.
A worker who becomes ill immediately before or during planned annual leave can also ask for those days to be treated as sick leave, subject to normal sickness-reporting requirements. That protects holiday entitlement where illness prevents the planned break. For a useful explanation of how absence and holiday rules can intersect in another compensation context, Lein Law Offices explains vacation rules.
Legal Framework and Worker Rights
The legal framework starts with the Working Time Regulations 1998 and the distinction between statutory and contractual leave. Statutory holiday is protected by law. Contractual leave may offer additional benefits, but an employer's policy must not remove statutory rights.
When sickness prevents a worker from taking statutory holiday, the leave generally receives carry-over protection rather than being forfeited. For a regular-hours worker employed throughout the leave year, up to 20 days of the 28-day statutory entitlement may be carried into the next leave year. Irregular-hours and part-year workers may carry over up to 28 days. The protected leave must generally be taken within 18 months from the end of the leave year in which it accrued, as explained in GOV.UK guidance on calculating leave entitlement.
What employers cannot do
An employer cannot instruct a sick employee to use annual leave merely to reduce the sickness balance or avoid sick-pay administration. That would confuse the worker's medical status with their holiday entitlement and could undermine the employee's choice.
Managers should also avoid treating a holiday request as proof that the worker is fit to return. Someone may be unable to perform their role but still want paid time away from work, particularly where they have a mental-health condition, limited sick-pay entitlement, or a recovery plan that includes rest away from normal work pressures.
What workers can choose
A worker can request annual leave for specified dates during sickness. If approved, those dates should be recorded as annual leave, while the sickness record should show the interruption and the date on which sickness absence resumes.
The organisation's leave of absence guidance for UK employers should reflect this choice clearly. Policies also need to explain notice, approval, pay treatment, evidence requirements, carry-over and how the organisation handles illness during planned holiday.
This short explainer can support manager training on the relationship between leave and absence:
Absence Recording and Pay Calculations
The most common failure isn't misunderstanding the legal principle. It's recording the wrong transaction. HR teams should keep three categories separate:
- Sickness days: Dates on which the employee is absent because of illness and remains recorded as sick.
- Annual leave during sickness: Specific dates the employee requested and the organisation approved as holiday.
- Cancelled holiday: Planned annual leave that illness prevented the employee from taking and that should be treated under the sickness process.
The original sickness record should remain intact. Create a linked annual-leave transaction only for the approved dates, then record the date on which sickness resumes. This chronology gives HR, payroll and the employee a clear explanation of what happened without rewriting the absence history.
Record the request, not just the outcome. The audit trail should show who requested the holiday, which dates were requested, who approved them, what pay basis applied and when sickness resumed.
Pay calculations need the same discipline. Annual leave and sickness absence have different pay and entitlement consequences, so payroll should receive the approved holiday dates separately from sickness dates. The applicable holiday-pay rules must then be applied to the leave transaction, while sickness pay is calculated for the remaining sickness period.
If illness occurs immediately before or during planned holiday, the worker can ask for the affected period to be treated as sick leave instead, provided normal sickness-reporting requirements are followed. The organisation should cancel or amend the holiday transaction, restore the relevant leave balance under its rules, and retain the evidence supporting the change.
Automatic conversion is a poor control. It can deduct leave without consent, distort absence statistics, produce incorrect payroll inputs and create disputes about whether a worker chose holiday or was pushed into it. Connected records and approval history are more valuable than a superficially simple absence code. HR teams reviewing the wider relationship between people data and pay can also consult HRManagement365's payroll and HR resource.
Policy Approaches for Employers
Employers usually drift towards one of two models. The first automatically assigns annual leave during sickness. The second requires the worker to request holiday and routes that request through approval. Only the second model respects the central distinction between an employee's choice and an employer's obligation.
| Approach | Administrative attraction | Compliance and operational risk |
|---|---|---|
| Automatic annual-leave deduction | Fewer individual requests for managers to process | May compel holiday use, obscure the worker's choice and create incorrect pay or entitlement records |
| Employee request and approval | Clear consent and a reliable audit trail | Requires defined workflows, manager training and payroll coordination |
Automatic deduction should be rejected. It treats holiday as an accounting offset against sickness, even though the worker may be entitled to remain recorded as sick and may not want to use leave. It also creates a poor experience for employees who are vulnerable, receiving limited sick pay or trying to manage a serious health condition.
The request-and-approval model requires more structure, but that structure is exactly what protects the organisation. A good workflow should capture the employee's request, validate the dates against entitlement, route the decision to the authorised manager, notify payroll and set the return-to-sickness date.
Recommended policy position
Use wording with this effect:
An employee who is absent due to sickness may request annual leave for specified dates. The organisation will not require an employee to take annual leave during sickness absence. Approved annual leave will be recorded separately from sickness absence and paid under the applicable holiday-pay rules.
The policy should also explain that an employee who becomes ill during planned holiday may ask for the affected dates to be treated as sick leave, subject to normal reporting. Managers need a consistent route for handling requests, not discretion to invent different rules across departments.
Practical Scenarios and Applications
Consider an employee on long-term sickness absence who requests annual leave for a short psychological break. The manager shouldn't ask whether the employee is “well enough to be on holiday”. The relevant questions are whether the employee made the request, whether the dates can be approved under the leave policy and whether payroll can distinguish those dates from the surrounding sickness period.
HR should record the request, approve only the specified dates, apply holiday pay to those dates and show the sickness absence resuming afterwards. The employee's request doesn't prove fitness for work, and it doesn't end the underlying sickness absence unless the employee formally returns.
A different situation arises when a worker falls ill immediately before a planned holiday. The worker should follow the normal sickness-reporting process and ask for the affected holiday to be treated as sickness absence. HR should preserve the sickness record, amend the holiday transaction and ensure the employee doesn't lose leave because illness prevented the break.
A planned holiday and a return to work are not the same event. Record the worker's health-related absence and their holiday entitlement independently.
The third scenario is managerial inconsistency. One team records an approved holiday during sickness as annual leave, another converts the whole absence to holiday, and a third rejects the request because the employee is sick. That inconsistency creates payroll disputes and weakens the organisation's audit position.
A single workflow solves more than a policy document. It forces the manager to select the correct transaction, records the employee's decision, and gives HR a review point when dates, entitlement or pay treatment appear unusual.
Building a Compliant Absence Management Policy
A workable policy should answer five questions in plain language:
- Can an employee request annual leave during sickness?
- Can a manager require it?
- How are the dates recorded?
- Which pay rules apply?
- What happens to holiday illness prevented the employee from taking?
The policy should state that annual leave during sickness requires an employee request. It should require the request to identify the dates, define the approving role, and explain how HR records the interruption without deleting the underlying sickness absence.
Build the workflow around evidence
Start with absence notification. Record the sickness start date, expected duration and required evidence under the organisation's normal process. If the employee later requests annual leave, create a separate request linked to the original absence.
The approval stage should check entitlement, dates and any operational rules without questioning whether the employee is sufficiently ill to take holiday. Once approved, the system should send the correct dates to payroll and create a clear return-to-sickness date.
A monitoring stage matters during long-term absence. HR should distinguish statutory and contractual leave, track the leave year in which entitlement accrued, and produce alerts before protected leave reaches its applicable expiry point.
Technology can support these controls when the data model reflects the policy. A solution built with Microsoft Power Platform and Dataverse can use structured records, role-based approvals and Power Automate notifications. Power BI can then present separate sickness and annual-leave reporting rather than one misleading absence total.
HRManagement365, powered by Hubdrive and Microsoft, can be configured to support leave and absence records, requests, approvals and reporting. Any organisation-specific rules, integrations or approval paths should be configured or extended deliberately, rather than assumed to exist as standard functionality.
Implementation and Technology Support
Implement the policy in this order:
- Define the rule: Employees may request annual leave during sickness, but managers cannot compel it.
- Configure the records: Keep sickness, annual leave and cancelled holiday as distinct transactions.
- Connect payroll: Send approved holiday dates and sickness dates through the correct pay process.
- Train managers: Teach managers not to infer fitness for work from a holiday request.
- Monitor entitlement: Track accrual, carry-over and expiry by leave year and worker type.
Most UK workers are entitled to 5.6 weeks of paid statutory holiday, subject to a maximum of 28 days for a worker employed throughout the year. A regular five-day week normally produces 28 days where bank holidays form part of the entitlement, while part-time workers receive the entitlement pro rata, as described in the official holiday-entitlement document. Holiday continues to accrue during sickness, so the absence shouldn't pause the statutory calculation.
For Microsoft-centric organisations, HRManagement365.com provides a UK and EU HR solution powered by Hubdrive and Microsoft technology. Based on Dynamics 365, Power Platform and Dataverse, it can be configured with custom workflows, integrations and HR applications, including connections with Business Central, Finance & Operations and other Dynamics 365 processes. Its leave and absence capability can support separate annual-leave and sickness records, approvals, reporting and employee lifecycle administration. Review leave of absence management software for HR teams when assessing your implementation requirements.
Start by mapping your current absence codes and payroll hand-offs. Then test the worker-request workflow with long-term sickness, illness during planned holiday and cancelled leave scenarios before rolling it out to managers.
Speak to an HRManagement365 specialist to review how HRManagement365, powered by Hubdrive and Microsoft, can improve, connect and automate annual-leave and sickness workflows across your UK or EU organisation. Phone +44 1522 508096 today or visit HR Management 365 and send us a message to discuss your requirements.
