This is from summer 2013, but the circumstances were pretty similar:
I was already a year into my residence in Switzerland (B permit, studying and working at the time).
I brought a car from Greece, that was a company car (family business), and I was on the board but not an employee.
At the border in Chiasso I stopped and got the 18.44 form.
I then talked to the customs office in Zurich, and they were actually quite helpful.
I gave them the following documents:
- a letter from the CEO and legal representative of the company stating that the company registered car was regularly used by me. That proved it was part of my personal effects, so I could import it for free.
- an excerpt from the government gazette (ΦΕΚ) where it shows that was part of the board of the company, to prove my connection to the company
I managed to get the car imported like this for a nominal amount, and then took the 13.20 form so that I could go to the STVA (the respective “μηχανολογικό”). There, I presented the 18.44 form as proof of importation, and took an appointment for an MFK (the respective “KTEO”).
This is a more detailed inspection than the regular one, and I had to also provide the Certificate of Conformity (CoC) for the car. This you can either get from the importer of the car in Greece (you can talk to a dealer and they will direct you), or you could also find an online service.
When the inspection was done, I just walked to the counter, and they gave me the grey card and plates and that was it.
It was a stressful month as I was new, a broke student, and I was always hearing horror stories abou the vehicle inspections, but all went well in the end.
If you only stay for a few months, I don’t think you should do anything for the car. In my first year I had a GR registered car, and I drove it all the time without issue, even during stops at the border or at police controls. Every time showed my B permit, I explained the car is only temporary and had the ferry tickets to show when it first travelled, so never had any problem. Maybe you can do the 18.44 only, but never actually go through with the process of importation.
I have a friend that for the past 10 months or so has been driving a Romanian registered car, also without issue as it’s here temporarily and she’s driving it back in a couple of weeks.
If you are going to stay here for longer and you want to keep the car, then by all means import it. But I think you have some time to decide, and you don’t need to do it immediately. Since it’s a company car, I would ask the legal representative of the company in Greece to sign a paper saying that the company is authorising you to personally use the car for a period of 6 months, so that you can justify personal use, in case someone asks.
If you’re employed or not by the current company is kind of irrelevant to the matter, unless you need to prove the connection so that you can import for free (as I did 12 years ago).