MF,
If your career plan is to contract your services there are a few factors which you should use to set your rates which may not be apparent to an employee on W2. Say for example that you believe you are worth $120K a year as an employee. What do you need as an independent contractor to bring in that same amount?
1. Start with this $120k value (or whatever)
2. Figure you are billing 9 months out of 12 average ~1,500 hrs = $120k/1,500 = $80/hr.
3. You pay 7.5% more FICA than a W2 employee. Add that: $80 + 7.5% = $86
4. Liability insurance: This is tax deductible so add $10k/1,500hr = $6.67 ~7 $86+7 = $93
5. Health insurance: W2 employees usually get this for a small monthly rate but this comes out of your pocket after taxes so you have to add the amount before taxes: I don't know your family size so guess $12k per year. $12k*(1/(1-35%))=$18.5k Div by 1,500 hrs - $12/hr $93+12 = $105.
6. Equipment, training, buy your own software, professional conference once a year etc etc. ~$5k, tax deductible. $5k/1,500=$3.33 That brings the hourly rate up to about $108/hr.
7. Business taxes. In my state it's about 2% after deductions. 1.02*$108 ~ $110
So, approximately $110/hr would be what you should charge to bring in the equivalent $120k that a W2 employee makes. Note that item #2 above also figures in your holidays (another W2 freebee), searching for clients, training time and other time an employee gets for free
Once I worked next to an engineer who was salaried at ~ $120k. He made a bitter, jealous remark that I got to keep all that money for myself. Odd - He's using calculus to perform thermal stress calculations but, incapable of simple "addition" like I laid out above. Usually they accept your fee as reasonable though.