This is an online account created by HMRC where you can manage your tax affairs online, quickly and simply, whenever you want.
A Personal Tax Account allows you to see the information that HMRC hold regarding your pay and tax. This means you can check you are paying the correct amount of tax. It’s designed to allow taxpayers to manage tax online without using paper forms or telephone.
The most significant features for doctors are
see what tax code you’re on, and how your tax is calculated. Here’s our guide to checking your tax code
see an estimate of the income tax you are likely to pay in the current year
check how your income tax has been calculated, and against which source of income it will be payable
view and make changes to your estimated pay, and complete associated forms to update the information that makes up your tax code
check the earnings your employer(s) have told HMRC about, including details of the tax you’ve paid and National Insurance contributions you’ve made each month-to-date in the current tax year, and for all 12 months of the previous tax year
A full list of features can be found here
And here is a useful guide from HMRC
We have made a step by step guide for doctors here.