I started at the company I currently work for about 10 months ago and immediately was thrown into work that I knew was wayyy above my pay grade due to understaffing. Though we have continued to grow my department, I have been maintaining those tasks in addition to my role because no one else has the bandwidth and because of my unique skills. During my upcoming review, I would like to point to these as accomplishments and reasons to hire me to a role / salary that matches the level of work I am doing.
I am a bit worried that my. boss will tell me something like, “Well, if it's not you job why were you doing it in the first place” or “OK fine, you can stop doing those tasks and stick to your job description.” Has anyone here ever been in a similar position? What did you say / do to avoid this line of reasoning?
TL;DR: I want a promotion to match my skills / contributions and worried it will backfire / be ignored.