CHAPS
These are payments to UK accounts that are guaranteed to arrive the day you make them, as long as you set up the payment in branch or by phone (if you have a business account) before 3:30pm, or online before 5pm, Monday to Friday.
If you set up the payment after those times, or on a weekend or public holiday, we’ll send the payment the next working day.
There might be delays if we need to speak to you about your payment before we send the money.
BACS
This type of payment is mostly used for sending Direct Debits and credits. The payments take three working days to clear. For example, money paid into your account on Monday will clear on Wednesday.