HICB and Net income question

I have had a letter from HMRC saying to check if I need to pay HICB for 2023-24 Obviously they only send these if they know you should pay it. Anyway it asks if your NET income was over 50k. My income before tax/NIC etc is 55k but NET is after deduction am I correct? which surely is under 50K am I correct ?

Hi,
The figure would be your income before tax and NI are deducted.
For further guidance please follow the link below:
Personal Allowances: adjusted net income
Thank you