I am working on a project that requires that I have access to accounting information in order to put it in a database for use in an application that I am building.
Some higher-ups in the finance department sent me an excel sheet that I asked for in order to do my job. The information in the excel sheet is the break down of salary budgets by department and it doesn't exist anywhere else. (That's why the application is being built). I needed the spreadsheet so I could both import the data into the database and analyze the structure of it so that a tool can be built to automatically extract/load the data going forward.
Everyone is okay with this, but there is a caveat. One of my coworkers is technically working as a contractor. Evidently, this person's salary was separated from my department's overall budget and in the sheet I was provided, there are clear markings of exactly what this person is paid every week.
I am not sure what to do at this point. My manager hasn't seen the spreadsheet as she doesn't need to (She already knows what my co-workers compensation is.) She knows that I know the department's budget for salary but she doesn't know that I know my coworkers specific compensation. I'm also not the only one who was sent the sheet. Two of my co workers have it as well. Presumably they saw this information, but no one has brought it up.
Half of me feels like I should just ignore this and continue on with my job. The other half of me feels like it would be more wise of me to inform my manager that I am now privy to this information in case somehow this blows up in the future. E.G. someone decides to make a stink about it and then my manager gets blind sided because she wasn't aware of the situation.
What should I do? If I tell my manager, what is the best way to frame this?