Certificates and Credibility: What to Do When a Doctor's Note Raises More Questions Than It Answers

For most household employers, a fit note from a GP feels like the end of a conversation. The document arrives, it carries an official stamp, and it seems unreasonable — even rude — to probe further. Yet employment law does not require you to accept a medical certificate without question, and in some circumstances, failing to investigate further can create significant problems down the line. Equally, challenge a note too aggressively and you risk an unfair dismissal claim or a discrimination complaint.

This guide is intended to help you find the sensible middle ground.

What a Fit Note Actually Confirms — and What It Does Not

Since 2010, GPs in England, Wales, and Scotland have issued 'fit notes' (formally Statement of Fitness for Work) rather than the old sick notes. A fit note confirms that a doctor has assessed the employee and believes they are either not fit for work, or may be fit for work with adjustments.

What it does not confirm is the precise nature of the illness, the severity of symptoms, or whether the employee's condition genuinely prevents them from carrying out their specific duties. GPs typically see patients for brief consultations, and they frequently rely on self-reported symptoms. A certificate is therefore a professional opinion based on limited information — not an irrefutable legal document.

This distinction matters. You are entitled to treat a fit note as credible evidence of incapacity without treating it as conclusive proof.

When Questions Are Legitimate

Certain patterns of absence create a reasonable basis for further enquiry. These include:

• Recurring short-term absences that consistently fall on Mondays, Fridays, or immediately before or after bank holidays
• Vague diagnoses such as 'stress' or 'fatigue' that coincide with a workplace disagreement or a request you have recently declined
• Certificates obtained very quickly, particularly on the first day of absence before the employee could plausibly have deteriorated significantly
• Absence that contradicts observed behaviour — for example, a PA signed off with a mobility condition who is seen running errands locally

None of these factors proves dishonesty. However, they do justify a measured, professional response that goes beyond simply filing the certificate.

The Step-by-Step Response Framework

Step one: Document everything. Keep a clear written record of all absences, including the dates, the stated reason, and any fit note received. This record will be essential if the situation escalates.

Step two: Maintain contact. You are entitled — and arguably obliged — to keep in reasonable contact with your PA during a period of absence. A brief, supportive message or call checking on their welfare is appropriate and does not constitute harassment. Agree a communication schedule at the outset of the absence.

Step three: Request a return-to-work conversation. When your PA returns, hold a brief, informal return-to-work discussion. This is standard good practice, not an interrogation. It demonstrates that you take absence seriously and gives the employee an opportunity to raise any underlying concerns.

Step four: Consider an independent medical assessment. Where absences are frequent, prolonged, or where the nature of the condition is unclear, you may request that the employee undergoes an Occupational Health assessment. You cannot compel attendance, but refusal without good reason can be taken into account in any subsequent proceedings. The assessment must be proportionate and relevant to the employee's ability to carry out their duties.

Step five: Trigger your formal absence management process. If a pattern persists after informal steps have failed, move to a formal stage. Issue a written invitation to a meeting, allow your PA to be accompanied, and make clear that the purpose is to understand the situation and agree a way forward — not to discipline.

The Legal Risks on Both Sides

Being too trusting carries its own risks. If you continue paying full sick pay and making no enquiries, you may inadvertently establish a contractual expectation. More significantly, if the absence is later found to be unjustified and you have taken no steps, dismissal at that point becomes harder to defend.

Conversely, dismissing an employee because you disbelieve a medical certificate — without following a fair procedure and obtaining independent evidence — is likely to constitute unfair dismissal. If the underlying condition amounts to a disability under the Equality Act 2010, you also face potential discrimination liability. Courts and tribunals consistently find against employers who substituted their own judgement for proper process.

A Note on Mental Health Certificates

Absences certified as anxiety, depression, or stress-related conditions warrant particular care. These conditions are frequently genuine, often serious, and can qualify as disabilities. Expressing scepticism about mental health diagnoses — even informally — can be deeply damaging and may constitute discriminatory conduct. Apply the same structured, evidence-based approach you would to any other condition, but be especially careful about the language you use in correspondence and conversation.

Practical Guidance for Household Employers

As a private employer, you are unlikely to have an HR department to guide you through these situations. The key principles to keep in mind are consistency, documentation, and proportionality. Treat similar absences in a similar way, record every step you take, and ensure that any action you take is proportionate to the seriousness of the situation.

Where you have genuine concerns and feel out of your depth, consider consulting an employment law adviser before taking any formal steps. The cost of a brief consultation is considerably lower than defending a tribunal claim.