Understanding why online sick certificates get rejected helps employees and employers navigate leave requirements more effectively. A certificate that does not meet workplace, employer, or legal expectations can result in a leave request being rejected, even when the person is genuinely unwell.
In this blog, we will explore the reasons an online sick certificate may be rejected and address frequently asked questions about these certificates. We will also discuss how both employees and employers can avoid these issues and ensure leave requests are handled correctly.
What Is a Medical Certificate, and Who Uses Them?
A medical or sick certificate is an official document confirming that a person was unfit to fulfil their work duties due to illness or unexpected injuries. Employers can request these certificates to confirm that an absence is legitimate. The Fair Work Ombudsman notes that employers can ask employees for such evidence even for a single day off. A medical certificate provides this evidence in a clear, Fair Work-compliant format.
Medical certificates are used by:
- Employees who need paid or unpaid personal leave for illness or unexpected injury
- Carers who need time off to look after an immediate family or household member
- University students who cannot attend lectures or meet deadlines due to illness or unexpected injury
Why Online Sick Certificates Can Be Rejected
There are several reasons why a certificate might not be accepted, and rejection does not always mean the certificate is fake. More often, something is missing, unclear, or does not align with the employer’s requirements. Common reasons for rejection include:
The Certificate Is Missing Key Details
Incomplete documents may lead to rejection. An employer may not accept a certificate that is missing:
- The patient’s full name
- The date the certificate was issued
- The date or dates covering the time off
- A clear statement about fitness for work
- The provider’s name and professional credentials
A valid certificate should clearly identify who it is for, who issued it, and the dates it covers.
The Provider Is Not Properly Qualified
Employers may question a certificate when an appropriately registered practitioner does not issue it. Documents from recognised, registered health professionals carry more weight than those from sources an employer cannot verify. Certificates reviewed by AHPRA-registered practitioners meet the professional standards employers generally expect.
The Certificate Does Not Match Workplace Policy
According to the Fair Work Act 2009, there are no strict rules about the exact format of evidence for sick leave. The evidence needs to satisfy a reasonable person that the employee was genuinely ill or injured and unable to work.
However, some awards or workplace agreements may require a certificate from a specific type of registered health practitioner in certain situations. It is worth checking these requirements before relying on any certificate.
Late Submission of Certificate
Delays in providing evidence may lead an employer to ask additional questions, particularly if the delay is unexplained or conflicts with workplace requirements. Providing evidence as soon as possible can help avoid disputes about sick leave.
The Certificate Appears Altered
Employers may question medical certificates if there are clear signs that the document may have been altered or is not authentic. Presenting a fake or altered certificate is illegal and can result in serious consequences for the employee. It is important to ensure that a legitimate healthcare professional issues the medical certificate and includes accurate information needed to satisfy a reasonable person.
The Consultation Process Was Not Clear
If a certificate does not appear to be based on an appropriate clinical assessment, an employer may question it. Under AHPRA guidance, issuing a medical certificate requires a clinical assessment of the patient. Assessment is not merely an administrative task, as telehealth is held to the same medical rigour as face-to-face care.
Validity vs Errors
It helps to separate the possible causes of a rejection:
- Legitimate but incomplete: The certificate is genuine, but it is missing required details or unclear.
- Incorrect: The certificate contains errors, such as wrong dates or a misspelt name.
- Lacks credibility: The certificate cannot be verified by the employer.
In most cases, rejection comes down to missing or unclear information rather than a document being entirely false.

How To Avoid Having an Online Sick Certificate Rejected
Most rejections can be avoided with a few sensible steps:
- Use a reputable provider with registered practitioners.
- Make sure the certificate includes all required details.
- Submit the certificate promptly.
- Check the employer or HR requirements before relying on it.
What Employees Should Double-Check
Before submitting a certificate, take a moment to confirm:
- The spelling of your name
- The provider’s details and registration
- That the certificate dates cover your absence
- The validity period of the certificate
- That the certificate details match the reason for your absence
What Employers Usually Look For
When reviewing a certificate, employers commonly look for:
- A clear provider identity, including name and registration
- Valid dates covering the absence
- A reasonable confirmation of your inability to work
- Professional, consistent formatting
- Evidence that the certificate came from a proper medical assessment
A document that meets these points is far less likely to be questioned.
Final Thoughts
The reasons why online sick certificates get rejected usually relate to a few common issues. These can include missing or unclear information, inconsistencies in the details provided, or insufficient information to satisfy a reasonable person that the employee was unfit for work. Rejection does not mean a certificate is fake. More often, it reflects a gap between what the document shows and what the employer needs.
Choosing a reputable provider, checking the details, and submitting promptly can help reduce the chances of a certificate getting rejected. If you need a valid medical certificate for work or school, you can get one from OnCare Health. Our registered practitioners can provide you with a legitimate certificate that meets all the necessary requirements.
Need sick leave evidence from a registered health practitioner? Apply for a certificate today.
Frequently Asked Questions
A valid online sick certificate includes your full name, the dates you are unfit for work, the date it was issued, and the issuing practitioner’s name and registration details. It should come from a qualified, registered health professional after a genuine assessment. Certificates from AHPRA-registered practitioners that align with Fair Work guidelines are widely accepted across Australia.
An employer may decline to accept a sick note if it is incomplete, appears suspicious or does not comply with workplace policy. However, a complete, properly issued certificate gives an employer fewer grounds to question it.
Employees can obtain online sick certificates through reputable telehealth providers in Australia. OnCare Health provides medical certificates in Australia through a structured process designed to support patients who need documented time off work. An AHPRA-registered practitioner reviews each request, and certificates are designed to meet Fair Work Act requirements, including a QR code for employer verification.
Sick leave can be questioned or delayed if the supporting evidence is deemed unacceptable. Workplace rules and employment requirements influence whether leave is approved.
A legitimate certificate is issued by a registered health professional, such as an AHPRA-registered practitioner, after a proper review of your situation. It will list the practitioner’s name and registration details, your name, the relevant dates, and the issue date.






