Military Vs Civilian

I was in the Military for 37 years and never once had a tax letter telling me that i had paid to little tax, even when promoted, bonuses, pay rises my PAYE was always correct. Since I have worked for my latest employer I have been placed on a K number for paying to little tax dispite being PAYE. My question is who should be keeping HMRC updated as I didnt have to do this whilst in the military?

Hi Sundodgerl,
You are ultimately responsible for making sure HMRC is aware of any changes to your employments or income.
If this is something you are not used to, we can help.
Please  contact us by webchat or phone here:
Income Tax: general enquiries
Thank you.