2018 / 2019 tax and NIC etc rates
Have you seen the 2018-2019 rates for income tax and National Insurance yet?
You can read them all at: https://www.gov.uk/guidance/rates-and-thresholds-for-employers-2018-to-2019
The April 2018 P9X is not being sent direct to employers by HMRC, instead you can download it here.