You will be charged the single fare to the end of the route, so always remember to tap off in order to pay the correct fare. If you do forget to tap off and are overcharged as a result, please contact customer services.

In 2026, if you forget to "tap out" with your contactless card or mobile device on a transit system like London's TfL (Tube/Rail), the system cannot calculate your exact fare. Consequently, you will be charged a "Maximum Fare," which can range from £7.00 to over £25.00 depending on the time of day and the zones involved (e.g., traveling toward Gatwick or Heathrow). This is not a "fine," but an automated adjustment because the journey is "incomplete." If this happens, you should log into your TfL account or use the app within 8 weeks to "complete" your journey manually; if your story is plausible, the system will usually refund the difference automatically. However, if a ticket inspector catches you on the train without having tapped in, or exiting through an open gate without tapping, you could be issued a £100 Penalty Fare, reduced to £50 if paid within 21 days.

If you forget to tap out with a contactless payment card or mobile device on a pay-as-you-go transit system (like London’s TfL, Singapore’s MRT, or similar systems worldwide), the consequences are generally designed to be fair but will cost you more money.

Here’s what typically happens:

1. You Are Charged a Maximum (Penalty) Fare

This is the most common and immediate consequence. The system doesn’t know where you traveled to, so it can’t calculate the correct fare. To prevent fare evasion, it assumes you made the longest possible journey on that route or network and charges you the maximum fare for that mode of transport.

• Example (London TfL): If you tap in at a Zone 1 Underground station but forget to tap out, you’ll be charged the maximum cash fare (which is significantly higher than any single journey, currently up to £9.40 for the Tube, or more if you traveled to a distant station outside London).
• Example (Singapore MRT): You’ll be charged the maximum fare for the train network, which can be over S$2.00 more than a typical trip.

2. It Can Break a “Journey” and Incur Extra Charges

For systems with fare capping (like daily or weekly maximums), an incomplete tap out can prevent that journey from being counted toward your cap. This means you might pay the penalty fare and not have it contribute to limiting your total daily cost.

3. How to Fix It and Get a Refund

The good news is that this is usually easy to correct and get your money back. Transport authorities understand people make mistakes.

• Automatic Correction: Many modern systems (like TfL) have “auto-complete” functionality. If you use the same card to tap in again within a set time period (e.g., the next day), the system will often realize you couldn’t have been traveling all that time. It will then automatically complete your previous journey and recalculate the correct fare, refunding the difference back to your card. This can take up to 48 hours.
• Manual Claim: If the auto-complete doesn’t happen (e.g., you don’t use the system again for a while), you need to contact the transit