Two years ago, my boss handed me my first annual salary adjustment letter. It was a substantial increase, retroactive to the beginning of the year.
I filed it away. I noticed a pay bump, but because I also adjusted my 401k and insurance around that time, it wasn't obvious that I wasn't getting the full amount described on the adjustment letter.
Doing my taxes the next year, I noticed my gross income didn't seem to match what I remembered that letter saying. I looked at my paychecks online and found that I was actually being paid $5k less than that amount. Unfortunately, I'd misplaced that letter, and started to suspect that I had just misread it. And it was still a decent increase, after all.
My next annual salary adjustment hailed a "raise" of $2k (i.e., less than I originally thought I was making the year before). But again, I couldn't say for sure without last year's letter, and I was embarrassed to think I'd misread that sort of pay increase.
After filing this year's salary adjustment letter, however, I found my original letter from 2017. It really does have that higher salary figure in black and white, and confirmed that number by saying it was "an increase of $XX,XXX." I hadn't misread it after all.
I brought all three salary adjustment letters to HR today and asked what happened. It turns out my manager asked for special permission to give me the larger-than-usual raise. In an email to HR, the CEO approved the smaller raise I actually got, but somehow that change never made it to the letter my manager ultimately signed and handed to me a couple weeks later.
On the surface, it looks like an honest mistake on HR's part. And I should have been more diligent in following up when I noticed the problem, especially now that it's two years (and two salary adjustment letters) past.
Should I mention anything to my manager? Or just let it go?