So confused about benefits/tax

Bugaboo1

I started a new job in October last year and with it came various benefits including some I added on such as private healthcare, critical illness cover, etc. I've never contacted HMRC myself previously to tell them of any new benefits but as I've also had quite a jump in salary this time, I'm wondering if I need to. I tried searching online but got thoroughly confused. 

Am I right in thinking that if my benefits are payrolled it's all taken care of but if not, I should tell HMRC what I get now to avoid a nasty shock after my P11D is issued? I'm not sure which my company does, I've emailed to ask, but I want to be prepared!

Penguin_

The chances are your company won't know the cost until after the end of the financial year. My employer gets their P11d reports from our healthcare providers in April/May & reports to HMRC in June & then we get our tax code adjusted in July/August.

Bugaboo1

We have a benefits portal and I can see the annual employer contribution for each of my benefits and when I changed my pension contribution I had an email which also details annual employer contribution and annual salary adjustment... I'm not sure how this helps though?!