One thing that was important to me was to be able to max out retirement contributions even while being self-employed. (I think a lot of folks that go into business for themselves will too easily convince themselves to sacrifice that early on.) So I had a spreadsheet that basically factored in my needed take-home income after taxes and retirement contributions, and added in those taxes and contributions, and I turned it into a daily (weekday) dollar amount that I needed to earn, complete with 7-day and 30-day moving averages. Being able to check that daily helped me to know whether I was on the right track. For the first few years, I think that was around $300-$400 per day - later on, I was able to stop paying attention to it since I was exceeding it so much.