When you are planning your computer consulting firm, one of the most important steps is setting your rates appropriately. You must consider that only about 75% of the time you work will actually be billable time, so your rates must be high enough to cover your expenses even without billing those hours.
Basically you will want to take your gross income and split it three ways: 1/3 to sales and marketing, 1/3 to taxes, insurance, and overhead, and 1/3 to technical staff salaries. You'll also want to be sure you include your salary in there somewhere.
Eventually, though, you may find that you want to surpass $100 per hour and that's okay too. Although you'll hit a ceiling at some point, many times you can charge $125 per hour. Your clients may hate paying more but they'll love the higher quality staff that will be serving them.
Learn more about setting your rates correctly when you read the whole article (link above).
Added by Joshua Feinberg