Tax amount charged differs each month

Hi I have a question in regard to my taxes. I noticed that I was charged almost £400 more in taxes this month than last month. My overall pay was the exact same amount as last month and my tax code is the same also. Could someone let me know why that is?

Hi,
We would need to access your records to check why the additional tax was deducted.
You can contact HMRC at:
Income Tax: general enquiries
Thank you.