score:4
Yes, you have to pay VAT. If you just bring it in your luggage as is - the backstory is absolutely irrelevant.
A decent company would have a shipping department that would handle this for you. They shouldn't be giving it to you to deal with, they should ship it to you and declare it accordingly and cover whatever taxes the customs require.
If you decide to carry it, they still should provide the customs documentation. Unless it was a gift to you, it's their computer given to you for work. You're importing a piece of business equipment. See here for details.