Comment by JohnFen

10% is the standard I follow. It's built into my budgeting at that level. There's nothing magical about the 10%, though, it's just what works for me and is easy to compute. But I also follow the "pay yourself first" rule -- I take 10% off the top of every dollar that I receive, and put that aside for future me. Then I set aside 10% of the remainder to pay back my community. So, it's really 9%.