There's been some talking about how much would be the right amount of money for one's services. Actually it's quite a simple calculation, sort of an upside down profit and loss statement. Let's start from how much you'd like to earn yearly after taxes. It goes like this:
Your desired annual net income
+ income taxes
+ retirement insurance
+ other insurances (illness, accident, damage, car, lawsuit...)
+ rent or other workroom costs
+ car maintenance and gas
+ phone
+ advertising
+ tools and their maintenance
+ accountancy
+ office equipment
+ mail
+ VAT
+ any other unavoidable costs I've forgot
_____________________________ ________________________
= The amount you'd have to make to cover all these. Spare parts paid by the customer aren't included.
Now divide that with 11 months to get your monthly budget. The 12th is for your vacation!
Divide the monthly budget with 22 working days for your daily budget.
Divide the daily budget with the amount of hours you're planning to work. 8 for a full-time job, 3-4 for a side work.
The amount will be much more than the salary of someone working for a company. That's because the employer normally will cover most of these costs, at least here in Finland. A self-employed person has to take care and cover all these by himself, only the regulations may vary. I already mentioned vacation. Another thing that should be covered by the charge is the readiness time. All businesses should have official opening hours during which they should be available, at least by phone for booking. There may be many time hogs during those hours: A customer wants your services later than you've opened but early enough to prevent you from doing another job in between. Moving from one place to another takes its time. You finish a job only to notice a couple of screws that should be inside the case. Saying goodbye may take half an hour after you've handed your bill... All these are hours you can't debit for, nevertheless they belong to your normal working day from which you should get paid for! So the charge for the actual working hours has to cover all this for you to get a decent pay. A salary that's comparable to the wage you'd get from the same waiting and lagging from an employee.