For example: 2011-2012 PAYE month 6 for period ended 5 October 2011.
The due date of 22 October 2011 falls on Saturday - a non banking day - if you are paying electronically, your PAYE payment must clear HMRC's bank account by Friday 21 October 2011.
You may therefore need to change your payment date to ensure you pay on time. If you do not do so, you will be noted as paying late, and late payments for this tax year may result in a penalty being charged.
For more information about payment deadlines