Yes, a UK employer can dismiss you for sickness absence — but only after following a fair process and exhausting alternatives. The key distinction is whether the absence is being managed as a capability issue (genuine illness) or a conduct issue (suspected abuse of sick leave). The process, the risks, and the protections are different for each.
Key Takeaways
- Dismissal for genuine long-term sickness must follow a fair capability process — including consultation, medical evidence, and consideration of reasonable adjustments.
- Dismissal for frequent short-term absence requires investigation of underlying causes and a staged absence management process.
- Automatic unfair dismissal applies if the absence is related to pregnancy, disability, or a protected characteristic.
- The ACAS Code of Practice sets the minimum standard for fair process.
- You have the right to be accompanied at any formal meeting and to appeal any dismissal decision.
When Can an Employer Dismiss for Sickness?
An employer can dismiss for sickness absence in two main scenarios:
Long-term sickness (capability dismissal). If you have been off work for an extended period and your employer has reasonable evidence that you will not be able to return to your role in the foreseeable future, they may dismiss you on the grounds of capability. Before doing so, they must consult with you, obtain medical evidence (often through an occupational health referral), and consider whether any reasonable adjustments would enable your return.
Frequent short-term absence. If you have repeated short absences — even if each one is genuinely covered by a fit note — your employer may dismiss if the absence level is unsustainable. However, they must investigate the underlying causes, consider whether the absences are disability-related, and follow a staged absence management process before reaching dismissal.
What Makes a Sickness Dismissal Unfair?
Under the Employment Rights Act 1996, a dismissal is automatically unfair if the reason is connected to:
- Pregnancy or maternity — including pregnancy-related illness at any point during pregnancy or maternity leave
- Disability — if the employer failed to make reasonable adjustments under the Equality Act 2010
- Health and safety activities — e.g. raising concerns about workplace health risks
- Asserting a statutory right — such as requesting a written statement of employment particulars
Even outside these automatic categories, a dismissal may be “ordinary” unfair if the employer did not follow a fair process. An Employment Tribunal will consider whether the employer:
- Had a valid reason for dismissal (capability or conduct)
- Followed a fair investigation and consultation process
- Considered alternatives (adjustments, phased return, redeployment)
- Made a reasonable decision based on the evidence
The Fair Process for Sickness Dismissal
A fair capability dismissal for long-term sickness typically follows these steps:
- Regular consultation meetings to discuss progress, prognosis, and treatment
- Occupational health referral for independent medical assessment
- Consideration of reasonable adjustments — can your role be modified, hours reduced, or duties changed?
- Phased return options — gradual increase in hours or duties
- Redeployment discussion — is there a suitable alternative role?
- Formal capability hearing — before any dismissal decision
- Right of appeal — you must be given the opportunity to challenge the decision
An employer who shortcuts this process — for example, dismissing based on a single GP fit note without seeking specialist opinion — is at high risk of an unfair dismissal finding.
When Is Dismissal for Short-Term Absence Unfair?
Some employers use absence triggers such as the Bradford Factor to identify when short-term absence has become excessive. This is lawful as a management tool, but it does not replace the need for a fair process. An employer who dismisses automatically after a trigger score is reached, without investigating individual circumstances, will likely lose at tribunal.
Red flags for unfair dismissal:
- The employer did not check whether the absence was disability-related before dismissing
- The employer applied a trigger without considering your explanation
- The employer dismissed without a formal hearing
- The employer did not offer an appeal process
- The employer treated pregnancy-related sickness as a disciplinary issue
FAQ
Can I be dismissed for sickness absence while on long-term sick leave?
Yes, but only after a fair process that includes consultation, medical evidence, and consideration of alternatives. Being on sick leave does not give you immunity from dismissal — but your employer must be able to show they acted reasonably.
What counts as a reasonable adjustment for sickness absence?
Common adjustments include reduced hours, amended duties, a phased return, workplace modifications, or a transfer to a different role. The Acas guidance on reasonable adjustments explains what employers should consider.
How long does an employer have to wait before dismissing for long-term sickness?
There is no set time limit. Some tribunals have found dismissal fair after 6 months of absence with a poor prognosis; others have found dismissal unfair after 18 months because the employer did not wait for a planned treatment. The key is the medical evidence, not the duration.
Can I claim unfair dismissal if I have less than two years’ service?
Generally no — the two-year qualifying period (one year in Northern Ireland) applies to ordinary unfair dismissal. However, automatically unfair reasons (pregnancy, disability discrimination, whistleblowing) have no service requirement.
What should I do if I think my dismissal was unfair?
Seek advice from Acas immediately. You have three months less one day from the effective date of termination to bring an Employment Tribunal claim. Keep all correspondence, medical records, and notes of meetings with your employer.