Managing Long-Term Sickness Absence

Executive Summary

A long-term sickness absence can affect a small business's workload, planning and finances, while leaving managers unsure how to support the employee and make decisions. A clear, proportionate process helps: agree how to stay in touch, understand the effect on work rather than seek unnecessary medical detail, consider adjustments and plan for a possible return. There is no single legal definition of long-term absence, and four weeks is a common workplace marker rather than a statutory threshold. The right approach depends on the person, the role and the information available.

What this means for your business

Many employers use around four weeks of continuous sickness absence as a practical point to review their approach. It is not a legal definition, and it should not become a reason to delay support. Consider the situation earlier if the employee or the work requires it.

An extended absence may involve repeated fit notes, uncertain recovery, treatment, fluctuating capacity, staffing pressure or a possible need for workplace changes. The number of days alone does not tell you what the employee can do, what support may help or when they may return.

A useful framework helps a small business to:

Keep communication respectful, useful and agreed with the employee.
Understand work-related and functional effects without routinely asking for a diagnosis or medical records.
Consider practical adjustments and a safe, sustainable return.
Know when specialist Occupational Health advice could help resolve uncertainty.
Review the situation and explain decisions if absence continues.

A fit note, an Occupational Health report or a return-to-work plan can inform decisions, but none removes the need to speak with the employee and consider the individual circumstances.

Legal and Statutory Requirements

For sickness lasting more than seven consecutive calendar days, an employee normally needs to provide a fit note; the first seven days can be self-certified. A fit note may say 'not fit for work' or 'may be fit for work' with support. If the employer and employee cannot agree on suggested changes, GOV.UK says the employee must be treated as not fit for work. (GOV.UK, Taking sick leave; Fit note guidance)
In Great Britain, employers must make reasonable adjustments where the Equality Act 2010 duty applies. Disability is defined by the Act; the adjustment duty can apply when the employer knows, or could reasonably be expected to know, that the person is disabled. (Equality Act 2010, ss.20–21 and sch.8; ACAS)
Workers' health information is special-category personal data. Employers must meet data-protection requirements, including identifying the relevant lawful basis and additional condition and limiting information to what is necessary. (UK GDPR; Data Protection Act 2018; ICO)
Employers must manage workplace health and safety risks. Review the risk assessment where a health condition or a proposed adjustment could change risks to the employee or others. (Management of Health and Safety at Work Regulations 1999; HSE)

There is no general statutory definition of long-term sickness absence, fixed contact schedule or standard phased-return duration, and Occupational Health referral is not automatically required. The Equality Act 2010 applies in Great Britain; Northern Ireland has a separate legal framework. If considering dismissal, get appropriate advice and follow a fair, individual process; dismissal for long-term illness should be a last resort.

What managers can do

1. Agree how to stay in touch. Ask the employee what contact is manageable and agree its purpose, frequency, method and contact person. The right level depends on the circumstances; weekly or fortnightly contact is not a universal rule. Keep conversations supportive and useful, and adjust the arrangement if it becomes overwhelming.

2. Focus on the effect on work. Ask what activities the employee can manage, what currently presents a difficulty, whether anything at work could help and whether they have a sense of likely timescales. Avoid routinely asking for a diagnosis or full medical records. Keep records factual, relevant, secure and accessible only to people who need them.

3. Plan for a possible return before a date is certain. Consider reduced hours, amended duties, temporary workload changes, workplace adaptations or a phased return. Agree what will change, for how long, how it will be reviewed and how pay will work under the contract and relevant policy. A phased return has no standard duration.

4. Explore adjustments rather than assuming they will not work. If the Equality Act duty may apply, consider reasonable adjustments in light of the employee's circumstances and the barriers they face. Adjustments can also be useful as good practice outside the legal duty. Check health and safety implications, explain decisions and consider other workable options if a particular request is not practicable.

5. Consider Occupational Health when it can answer a clear work-related question. It may help when fit notes are unclear, adjustments are difficult to identify, the return plan is complex, capacity or safety is uncertain, or the absence may continue. Explain the purpose of a referral and what relevant information would be shared; follow the provider's consent and information-handling process. OH advice informs the decision but does not make it for the employer.

6. Review prolonged absence fairly. If there is no foreseeable return or the impact is becoming difficult to sustain, explain the concerns and consult the employee before reaching a decision. Review current medical or Occupational Health information, reasonable adjustments, possible changes to the role and other suitable options such as redeployment. If a capability process is needed, keep it individual, evidence-based and well documented. Dismissal should be a last resort.

Examples

Uncertain recovery: An employee has been absent for eight weeks after an injury affecting mobility. The manager and employee agree monthly check-ins by email, review the fit note and discuss what information would help with planning. With the employee's agreement, the employer seeks focused Occupational Health advice about functional capacity and possible adjustments. They prepare a provisional return plan but do not treat an estimated date as guaranteed.
No clear return date: An employee has been absent for several months and the likely recovery remains uncertain. The employer explains the operational concerns, invites the employee to discuss the situation, considers up-to-date advice and reviews possible adjustments and alternative work. If capability action is being considered, the employee has a meaningful opportunity to respond before any decision is made.
Adjustments support a return: An employee with a fluctuating condition returns on temporarily reduced hours and modified duties. The manager and employee agree review dates and what information will indicate whether to increase hours. They keep the arrangements under review rather than assuming a fixed timetable or treating a setback as misconduct.

Common Pitfalls

Small businesses can avoid common problems by not:

Leaving contact until the employee returns, or contacting them so often that it feels intrusive.
Treating four weeks as a legal threshold or waiting for a set number of days before considering support.
Asking for detailed medical records when work-related information would be enough.
Assuming a fit note gives a guaranteed return date or a complete list of workplace adjustments.
Rejecting adjustments without considering their purpose, practicalities and possible alternatives.
Assuming a phased return must last a standard number of weeks or overlooking pay arrangements.
Starting a capability process without discussing the situation, reviewing relevant evidence and considering adjustments.
Treating an Occupational Health opinion as a decision or substitute for management responsibility.

Keep the process individual, proportionate and focused on what the employee may be able to do safely.

When to Consider Occupational Health Input

The fit note or other available information does not clarify work-related capacity or likely timescales.
There is uncertainty about safety, especially in a safety-critical role.
Possible adjustments are unclear, complex or have not worked as expected.
A return-to-work plan needs specialist input.
The absence is prolonged and capability or redeployment options may need careful consideration.
The employee and employer have different views about functional impact or support.

A referral is a tool for obtaining work-focused advice, not a legal requirement for every absence and not a substitute for employee consultation.

Bringing It All Together

Managing long-term sickness absence well means staying in contact, focusing on the effect on work, exploring adjustments and reviewing the situation openly. There is no single timeline that suits every employee or business. Use proportionate evidence, seek Occupational Health input when it can resolve a real question, and take specialist advice before difficult capability decisions. OH Sam can help managers organise practical next steps, but does not replace legal, clinical or specialist Occupational Health advice.

Frequently Asked Questions

How long does sickness absence have to last to count as long term?

There is no general statutory definition or single legal threshold. Many employers use around four weeks of continuous absence as a practical marker, but this is a convention, not a rule. Support, contact and planning may be appropriate much earlier, depending on the employee and the work.

When does an employee need to provide a fit note?

For sickness lasting more than seven calendar days in a row, including weekends and bank holidays, an employee normally needs a fit note from an appropriate healthcare professional. For the first seven days, they can self-certify. If a fit note says the employee may be fit with changes but the employer and employee cannot agree on those changes, GOV.UK says the employee must be treated as not fit for work. A fit note is evidence and guidance; it does not replace a conversation about what work may be possible or safe.

Do I have to refer an employee to Occupational Health?

There is no general legal requirement to refer every employee to Occupational Health. A referral can help where there is uncertainty about functional ability, likely timescales, safety or possible adjustments. Explain the purpose of the referral, what information is relevant and how it will be handled.

How long should a phased return last?

There is no fixed statutory length. The employee and employer should discuss a suitable, reviewable arrangement based on the person's circumstances, role and available advice. Agree the hours, duties, review points and pay arrangements rather than assuming a standard two-, four- or six-week period.

What should I do if there is no clear return date?

Keep communication supportive and agreed, review relevant information at reasonable intervals, and explore adjustments or other workable options. If the absence may become unsustainable, consult the employee and follow a fair capability process. Dismissal should be a last resort after considering support, reasonable adjustments and alternatives.

References

ACAS (2026) Keeping in touch during absence. Available at: https://www.acas.org.uk/keeping-in-touch-during-absence (Accessed: 4 October 2026).
ACAS (2024) When an employee is off sick. Available at: https://www.acas.org.uk/sick-leave (Accessed: 4 October 2026).
ACAS (2025) Reasonable adjustments at work. Available at: https://www.acas.org.uk/reasonable-adjustments (Accessed: 4 October 2026).
ACAS (2024) Sickness and ending employment. Available at: https://www.acas.org.uk/sick-leave/sickness-and-ending-employment (Accessed: 4 October 2026).
Equality Act 2010, c.15, sections 20–21 and Schedule 8. Available at: https://www.legislation.gov.uk/ukpga/2010/15/contents (Accessed: 4 October 2026).
GOV.UK (2023) Fit note: guidance for employers and line managers. Available at: https://www.gov.uk/government/publications/fit-note-guidance-for-employers-and-line-managers (Accessed: 4 October 2026).
GOV.UK (n.d.) Definition of disability under the Equality Act 2010. Available at: https://www.gov.uk/definition-of-disability-under-equality-act-2010 (Accessed: 4 October 2026).
Health and Safety Executive (2024) Managing sick leave and return to work. Available at: https://www.hse.gov.uk/sicknessabsence (Accessed: 4 October 2026).
Information Commissioner's Office (n.d.) Data protection and workers' health information. Available at: https://ico.org.uk/for-organisations/uk-gdpr-guidance-and-resources/employment/information-about-workers-health/data-protection-and-workers-health-information (Accessed: 4 October 2026).

OH Sam is a self-serve tool for practical workplace health advice and support. It does not replace clinical, legal or specialist occupational health advice.