then you will need to complete the tax filing up till now and then get your accountant to close out the company. VAT, Tax and Social Security will need some forms/statements then it's a relatively simple process to close the company. Your accountant should be able to do that for you
when your friends arrive in Thailand they need to go through the red declare lane at customs. They will need a receipt from back home to prove the value of the product. They might or might not need to pay any tax, depends on whether it's a huge amount. What you need to ensure is that the product or any of it's ingredients is not on a prohibited list. If it is then it will be confiscated. Make sure they keep the tax receipt for you. In my experience there are not many who go through the red zone so they are super friendly when you do.
I know a small locally owned rental company that does good long-term rental deals and can deliver cars to anywhere in Thailand. They manage cars for owners who give them their cars to manage on long term rentals as well so if you want to ow a car they can rent it out for you for the months you are not here. They have one of my cars and I am very pleased with the service.
I hired an international removals company to pack and ship my goods. The firm appointed Boonma Moving Bangkok to handle customs and final delivery to me. It's a couple of years back but the rules still apply. Standard international removals practice. Talk to the guys at Boonma they can assist you
%20Import%20%20-%20FIDI%20Customs%20Guide_0.pdf import duty is tax levied by customs on goods brought into Thailand. When moving here you have months to bring your household goods in tax/duty free. After that you have to pay import tax on anything you bring in.