Forgot to tap out on TfL: why it can trigger an investigation letter
Forgetting to tap out can happen for genuine reasons: crowded exits, open barriers, rushing for a connection, or simply habit. But once TfL issues an investigation letter, the situation is often treated more seriously than a routine “incomplete journey” adjustment.
The key is to understand what stage you are at. There is a difference between an incomplete journey being corrected on your Oyster or contactless account and TfL investigating a possible fare evasion offence.
Why TfL takes “forgot to tap out” seriously
If TfL has issued an investigation letter, they are usually looking beyond a simple billing issue. They may be reviewing journey data, past travel patterns, and any notes recorded by staff to decide what happens next.
At this stage, what you say in a response matters. A rushed reply can accidentally create admissions or contradictions that are difficult to undo later.
Upload your letter for reviewWhat TfL may be looking at
- Whether the journey shows as incomplete in your Oyster or contactless history.
- Whether there are multiple incomplete journeys over time.
- Whether you were stopped by an inspector and what was recorded.
- Any notes about what was said at the time.
What not to do
- Don’t ignore the letter and hope it goes away.
- Don’t send a rushed apology that implies intent or repeated behaviour.
- Don’t guess times, stations, or dates if you are not sure.
- Don’t assume “forgot to tap out” automatically ends the matter.
If you’re close to the deadline
If your letter gives you a deadline, take it seriously. If time is tight, it is often better to get clarity on the stage you are at before sending a detailed written account. The goal is to avoid creating admissions that are difficult to undo later.
What happens next
TfL may review your account alongside their records and decide what to do next. In some cases, an out-of-court resolution may be considered. In other cases, TfL may proceed toward prosecution.
Whatever you do, keep copies of any letters or emails and make a note of dates.
Next steps
- Confirm what letter you have and any stated deadline.
- Save your journey history (screenshots can help) if relevant.
- Write down what happened while it is still fresh.
- If court paperwork arrives, act immediately.
Unsure what stage your TfL case is at?
Upload the letter you received and a short summary of what happened. We'll review it and explain the stage of the investigation and the realistic next steps.
Often treated more seriously once an investigation letter is issued.
Not legal advice. No outcome is guaranteed. Not affiliated with Transport for London.