Hey fellow travellers—London’s contactless system is brilliant… right up until you tap once and realise you might’ve needed two.
In this guide, I’ll walk you through exactly how PAYG/contactless works for London buses and the Tube, what caps to expect, and what to check when tapping in and out.
Contactless PAYG 101: what’s happening when you tap
PAYG vs prepaid: you’re using your card like a fare meter
Contactless on TfL works as Pay As You Go (PAYG). That means:
- You tap with a contactless card (or phone wallet) instead of buying a ticket.
- TfL charges you based on your journey details.
- Your final fare is typically calculated after your taps, then shown/settled on your card account (you may see small “pending” amounts).
The key idea: the system needs the right taps to know where you started and ended.
Contactless card vs Apple Pay / Google Pay (you can use both)
In most cases, you can use:
- A contactless bank card (Visa/Mastercard contactless are the usual suspects)
- Apple Pay on your iPhone
- Google Pay on Android
Practical tip: whatever you use, make sure it’s the default payment method in your wallet before you start tapping. If you accidentally switch cards mid-journey, it can create “incomplete journey” problems.
Do you need to “set it up” anywhere?
Usually, no.
What you do need is common sense prep:
- Ensure your card/phone has an active contactless feature
- Check you’re using the same device/card each time you travel that day
- Have a backup plan for times when a reader is glitchy (more on that later)
Where contactless works (buses, Tube, and the main systems)
If you’re wondering “will it work everywhere?”, the answer is: it works on most TfL travel you’ll actually use as a visitor.
You can use contactless on these TfL modes
You’ll usually be good to go on:
- Buses
- London Underground (the Tube)
- Docklands Light Railway (DLR)
- Trams (Tramlink)
- London rail services with TfL readers (e.g., journeys using TfL PAYG ticketing in London)
Where you might get caught out
Some parts of London transit use different ticketing setups, and contactless PAYG may not work the same way (or may require different readers/procedures).
When you’re unsure, look for:
- The TfL contactless/Oyster readers (usually clearly marked)
- The standard tap-in/tap-out flow at entrances/exits
If a station area doesn’t have the readers you expect, don’t keep tapping blindly—double-check with station signage or staff.
What “tap in” and “tap out” really means
This is the bit that trips people up.
- Tap in = you’re entering the paid system (start of your journey)
- Tap out = you’re leaving the paid system (end of your journey)
For buses, it’s usually simpler (tap-on only). For the Tube/rail-gated systems, tap-in + tap-out matters a lot.
Step-by-step: tapping contactless on London buses
Buses are where contactless feels most like “tap and go”. If the Tube is the paperwork, the bus is the shortcut.
Before you board: get your card/phone ready
I like to do this before I step on, because busy boarding is not the time to start unlocking your phone.
- Have your contactless card or phone wallet unlocked/ready
- Stand near the front reader (usually by the driver/entrance area)
- If you’re using a phone, make sure screen brightness/power saving isn’t about to kick in
Where to tap on a bus
On most London buses:
- Tap once when you board at the reader near the entrance/front
- Keep moving—there’s no “gate” system like the Tube
A good rhythm:
- Tap → walk on → find your seat
If you miss the tap (or it fails)
This is where you want to be calm and practical.
If the reader doesn’t work and you only notice after you’re on:
- Check if there’s an obvious reader error message (sometimes you’ll see a light/indicator)
- Tell the driver if you can—drivers can often advise the next step in the moment
- If you later realise you didn’t tap at all, expect it could be treated like a missing/incorrect journey record
I’m not going to pretend you’ll instantly fix it perfectly on the bus—London systems are automated—but acting quickly helps.
Step-by-step: tapping contactless on the Tube and rail
The Tube is still easy once you know what the station expects from you. The big difference from buses: tap in and tap out.
At the gates: tap in to enter
On the Tube you’ll typically find:
- Barriers/gates at entrances
- Yellow/marked readers near the gate entry lanes
Step-by-step:
- Go to the gate lane with the contactless/Oyster reader
- Hold your card/phone against the reader
- Wait for the green light/approved beep (or whatever your station uses)
- Walk through the gate promptly
Common mistake: tapping late after you’ve already moved through the wrong gate lane. If you can, stop and sort it before you commit.
Exiting: tap out at the end of your journey
This is the part you really don’t want to get wrong.
When you leave the paid area:
- Find the exit gates and tap at the reader
- Don’t just walk out—wait for the approval signal
If you fail to tap out, you risk being charged in a way that assumes a longer/unfinished journey.
What if you change lines or stations?
Good news: you don’t usually need to “tap again” every time you transfer inside the Underground network.
What you do need to remember:
- Your overall journey is still tied to your entry tap and exit tap
- Transfers are normally handled inside the network
Where it gets tricky is if you:
- Leave the paid area and re-enter
- Use a different payment method/card in the middle
- Switch devices between taps
If you do leave and re-enter, treat it like a new paid journey unless the station flow clearly keeps you in-system.
Special case: smaller systems with different reader placements
DLR and trams can feel slightly different because the physical layout varies.
General rule:
- If it’s asking for a tap at entry/exit, follow that instruction
- Use the reader at the point that signage indicates (don’t “hunt” for a reader that isn’t the correct one)
Caps and how the fare gets calculated
The biggest relief with contactless PAYG: TfL applies fare caps so you’re not paying for every single hop forever.
Expect daily caps (and yes, the amount can change)
TfL updates fare caps over time, so I can’t responsibly promise you an exact “always £X” number. What I can tell you based on how the system is designed:
- There are daily caps for bus travel and for Underground/rail travel
- Caps are meant to limit the total you pay in a day
- The exact cap level can change year to year
What to do with this info:
- If you’re budgeting, think “caps mean it’s usually far cheaper than paying every single journey as a separate fare”
- For the precise amount on your travel dates, check the latest TfL contactless/PAYG cap info (or rely on the final settlement you see in your card app)
Bus vs Tube/rail caps are usually separate
In practice, it’s not always one single pool of money.
A safe expectation:
- Buses typically have their own capping logic
- Tube/rail fares have their own capping logic
- If you do both in one day, you may see charges that reflect both areas of the system
Weekly caps: how they can (sometimes) feel different
Some travellers assume there’s a perfect “weekly cap” that makes the maths identical every time. In reality, the system is cap-based and zone/journey-based.
Instead of betting your entire trip on a “weekly total equals X,” I’d do this:
- Treat daily caps as the reliable anchor
- Use your banking app/card statement as confirmation of what actually happened
When you’ll see the final amount
Depending on your bank:
- You might see a transaction appear quickly, then adjust later
- Or you might see the “final” settlement after some processing
If you’re staring at your app worrying something is wrong, it’s often worth waiting a bit—TfL charges are designed to reconcile with your taps.
Troubleshooting: tap failures, wrong cards, and incomplete journeys
Everyone has a “why isn’t it working?” moment in London. Here’s how to handle the common ones without spiralling.
Card/phone not recognised
If the reader doesn’t approve you:
- Move your card/phone slightly and try again (readers can be touchy)
- Check you’re tapping on the correct reader lane (especially at gates)
- If using Apple Pay/Google Pay, confirm you’re holding the phone to the correct spot and that it’s actually using the right card
If it still fails:
- Look for signage about contactless troubleshooting
- Consider asking staff at the station (they deal with this all the time)
Using different cards/devices on the same trip
This one can be painful.
Try hard to avoid:
- Switching between your physical card and your phone mid-day
- Tapping in with one card and tapping out with another
If you accidentally do it, the system may treat the journey as incomplete or charge differently.
Your best move after the fact is to:
- Check your card statement for the journey pattern
- Keep any receipt/screenshot info your bank provides
- Follow the appropriate TfL support process if you need a correction
Multiple passengers: don’t assume each tap is “for the group”
Contactless doesn’t usually let one tap cover multiple people.
In general:
- Each adult passenger should tap their own card/device
- If you’re travelling with friends/family, agree who taps and where before you approach the reader
If you tapped out somewhere “wrong”
This happens: you exit one barrier, then realise your stop wasn’t the one you meant.
What to do:
- Don’t panic and keep tapping wildly—find a sensible station route
- If you’re inside the network, follow the signage to re-enter correctly
- If you’re not sure, ask station staff rather than creating extra incomplete taps
The more careful you are, the fewer “I thought it would work” charges you’ll have to deal with later.
Final thoughts (and a quick tap checklist)
The rule that makes it all click
If you remember just one thing, make it this:
- Buses: tap once when you get on
- Tube/rail with gates: tap in when you enter and tap out when you leave
Quick checklist before you walk up to a reader
Run through this in your head:
- Am I using the same card/phone I tapped with last time?
- Am I tapping at the correct reader (not the “nearby one”)?
- Do I need tap-in only (bus) or tap-in + tap-out (Tube/rail)?
- Did I get the approval signal (green light/beep)?
If you do those things, contactless becomes the effortless London experience it’s meant to be.
Safe travels—and if you want, tell me which zones you’re planning to visit and I’ll help you sanity-check whether your day is likely to hit the caps you’re expecting.
