You know when you’re at the last stage before your cash arrives at an ATM, and it warns you that your issuer might charge and asks you if you’re sure? Well today, I accidentally pressed “No”, and Monzo debited me anyway! I then went back through the process and got my cash, and Monzo said I was then overdrawn! It did then recognise the refund, so I only really got debited by the correct amount in the end. I know the balance is only checked overnight for the purposes of calculating overdrafts, but are there any cases where this could be problematic? I was pretty surprised to see a charge and then a refund for a transaction that never really happened…
Hello 
It’s the way authorisations and presentments work.
When you choose the amount in the ATM we reserve it and put it aside for the cash guys*. 
It’s not actually presented until around 24-48 hours later but can take up to 7 days for the cash guys* to collect it. Even longer, sometimes.
As Monzo notify you at authorisation, so it is realtime availability, it looks like the money has left your account. When in reality it is in it’s own little pot for the cash guys* to collect. 
*Replace cash guys with merchant where appropriate
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Thanks Beth! Just thought I’d ask 
PS - I hope you’re in the pub…
in the dining room at home, at your service.
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Yeah, I wondered that myself as I’ve had the Monzo notification happen just before the charge confirmation.
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