Hi Tom, Thanks for getting back to me and sorry for the delay in replying. Yes, fully paid invoice - basically we had to amend how the time was split on a couple of invoices and so we'd sent a version 2 but they paid the original which was a higher amount.
I asked the client how they'd like the refund and they asked me to create a credit note - originally, I showed it as negative line on our next invoice to deduct the whole amount by £360 but they didn't go for that option.
Do you mean refund by bank transferring it back to them? We don't have their details.
As they've asked for a credit note, I should honour that - but the VAT question still remains.
Thanks,
Emily