I only know this because the person who was my supervisor slipped up and told me... I didn't stick around there too long after that and have built up a great group of consistent clients of my own.
And when you're considering what you think your annual income should be keep in mind that you have to cover your own vacation, insurance, self-employment tax (depending on where you file), and assorted other expenses.
If we assume 4 hours a day, five days a week, 50 weeks a year of billable time you'll need to up the rate to make that amount as in-your-pocket cash.
50 * 5 * 4 * 120 = 120,000.00
That's what the clients will be giving you. Out of that comes insurance and self-employment tax and additional social security (in the USA, as an example).If you are working backwards from a fixed salary you have to also add in the dollar value of additional taxes and insurance, plus whatever other benefits you might be getting.
$120K salary at a regular job > $120K in paid invoices from clients.
If you're a consultant or contractor or whatever, even if you work 8 hours a day they are not all billable hours. There's the tedious business work to look after (record keeping, business development, etc.)
I think a lot of "freelancers" must end up going through headhunters instead of finding clients directly? You might want to ask what your headhunter is making if that's the case -- I know of one body shop that only offers $50/hr to its contractors, while the client company is paying the headhunter $150/hour.
You can't even get a desktop support person out around here for less than $75/hour...