I work for a few different contracting agencies and have had a very good relationship with one of them. Recently, they hadn't paid me for over a month and when I contacted them they solved the problem. However, according to my calculations they still owe me $5.
I almost don't think it's worth pointing out but I've already made notes on how I got the number after going through my bank statements, invoices and expense sheets.
How can I politely bring this up? (I feel like this is the kind of question that often gets weird answers over on https://interpersonal.stackexchange.com/)
Also, any tips for a decent accounting system or app that helps keep track of these things would be appreciated. I try to keep a spreadsheet for each agency but could use something that reminds me if I have an outstanding invoice.