I suspect that it is because the finance people want to disappear off on leave so want to get it done early, (at least that's how it seems here as whilst pay day is only being moved due to falling on a weekend all the the various monthly paper work things have to be in a couple of weeks early ...)
Getting it done early (as I have to do with 4 payrolls) doesn't mean you can't date the bank transfer for the usual time at the end of the month...




