Two jobs in Spain? Is this possible

I am working in Spain for over 2 years now, paying my taxes and social security. Now I would like to open a company here in order to make the invoices for the addicional jobs I am doing sometimes, and the questions pops to my mind.

How is it if I want to be a freelance and keep my existing job in the same time?
Is this possible?
If so, will I have to pay Social security twice (my company I am working in is paying one for me)?
What about the tax level?

Any comments will be highly apriciated.

Kind regards,

Jackie

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Generally speaking, if you are self employed and pay your own social security etc. you do not have a job. You can invoice anyone for work done for your clients. If you are employed, you have a labor contract, and your ss is paid out on top of your nomina. If you are employed full time (40 h per week) you are unable to legally work anywhere else, if you are part time, you can. If you earn more than 70.000 per year it becomes interesting to form a SL company. The tax levels on self employed base income is the same, no matter if you invoice one or more different clients.

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