If you’re leaving the UK you must tell HM Revenue & Customs (HMRC) and give them your…
Estimate your Income Tax for the current year
Use this service to estimate how much Income Tax and National Insurance you should pay for the current tax year (6 April 2019 to 5 April 2020).
This tells you your take-home pay if you do not have any other deductions, such as pension contributions or student loans.
More info, Click here.