Due to a major upgrade to the National Insurance and PAYE Service (NPS) the majority of services in the Personal Tax Account (PTA) will be unavailable from midday Friday 13 October 2017 to midday Sunday 15 October 2017.
This affects Pay As You Earn (PAYE) and self-assessment. HMRC apologises for the inconvenience.
More information about PAYE service availability and issues can be found here.