Illness or a hospital stay stopped you filing: appealing an HMRC penalty
Serious illness, a mental health crisis, or an unexpected hospital stay around the filing deadline is one of HMRC's own listed examples of a reasonable excuse, and can cancel a late-filing penalty. The appeal needs to show what the illness was, when it happened relative to the deadline, how it stopped you filing, and that you filed as soon as you reasonably could once you were able to. Dated medical evidence makes the difference.
Written by the team behind Agent Arthur, our HMRC and tax specialist. This guide is general information about UK law, reviewed for accuracy.Why health grounds are among the strongest excuses
HMRC publishes examples of what counts as a reasonable excuse, and serious illness, a stay in hospital, and mental health conditions that affected you are on that list. Health is one of the more reliably accepted grounds because it is, by nature, unexpected and outside your control, which is exactly the test.
The penalty itself is automatic. A computer issues it whether or not you had a good reason. That is why appealing matters: the reason only gets looked at when you put it in front of HMRC.
What your appeal needs to show
- What the illness or health event was, in plain terms
- When it happened, relative to the 31 January deadline: an illness in early January that resolved by mid month needs to explain the rest of the delay too
- How it actually stopped you filing, not just that you were unwell
- That you filed the return as soon as you reasonably could once you recovered
- Dated evidence: a hospital admission letter, a GP note, appointment records, or a discharge summary
Common reasons a health appeal still fails
- The illness is real but the dates do not line up with the period of lateness
- There is no evidence beyond your own account, and HMRC asks for more
- You recovered well before the deadline but still filed months late, with no explanation for the gap
- The return was never filed: HMRC generally will not consider the appeal until the outstanding return is in
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Does the illness have to be my own?
Not necessarily. Caring for a seriously ill partner, child or close relative around the deadline can also amount to a reasonable excuse, particularly if it consumed the time and attention you would have spent filing. The same test applies: unexpected, outside your control, and you filed as soon as you reasonably could afterwards.
What if it was a mental health condition rather than a physical one?
HMRC accepts that mental health conditions and disabilities that affected your ability to file are relevant. It can feel harder to evidence, but GP records, a letter from a treating clinician, or evidence of treatment around the relevant period all help.
How much medical detail do I have to give?
Enough to show the excuse is genuine and covers the period of lateness. You do not have to disclose every detail of your condition, but a bare statement with no dates or supporting evidence is weaker than one backed by a dated letter or record.
I recovered but was still late filing. Does that ruin the appeal?
Not automatically, but you need to explain the whole period. If illness stopped you filing in January and you filed in February once recovered, that reads well. A gap of several months after recovery needs its own explanation.