I have been working as an IT Freelancer (Self-Employed) for some years now. The hourly rate for my first larger Job was a suggestion from my client, and over the years it evolved by aligning with the rate of other freelancers.
What I miss from time to time, especially in salary negotiations, is kind of a formula / system to exactly explain to my customer why I charge what I charge. So I started to develop something.
My current calculation is based on an Entrepreneurs Salary (based on what I could earn as an employee) plus Healthcare/Social Insurance, Taxes and Operating cost (Hardware, Tax Counsel, ...).
This, I compare to the work hours per year based on how many hours I would work as an regular employee minus the time I need to invest for administrative Stuff, Planning and aquiring new jobs in order to get a hourly rate equal to regular employment.
What I miss in my calculation is Risk. There are certain risks that i just won´t have as an employee. (Especially in Austria where I live you are secured against almost everything as an employee - be it a longer leave due to illness or accident, or if your employer declares bankruptcy)
Right now, the difference between my hourly rate and the calculation to be even with an emoloyee (in the terms mentioned before) is 15%, what i see as my calculated risk.
I´ve already done some reasearch on the web, but I still can´t find any values I could compare my 15% against. So what I am looking for is a percent value (EDIT: or a range), backed by some credible source or professional experience for usual values for calculated risk. Preferably from some smaller company in IT, but for starters, any credible value will do as I don´t have anything to compare mine to. Perfect, of course, would be a credible value from another freelancer, but I´m not sure if that´s realistic to ask for.