Earning Between 100k and 150k

I read that the threshold for submitting a self assessment tax return shifted this year from 100k to 150k. I also read that all income over 100k is still taxed at the higher rate. Can anyone please explain how this works in practice? Will the income over 100k now be charged via PAYE? Or do I need to take any other action to pay the extra tax due?

Hi Emma,
If your income is above £100K but below £150K then you do not need to complete a Self Assessment tax return.
Your record will be reviewed at the tax year end and if you have underpaid or overpaid your tax a calculation will be issued to you. 
Thank you.