most countries have tax relief when you're moving there to live - though might have needed to sort out the paperwork in advance (ToR1 form in the UK, if it's of interest).
RE: taking parts back with you - 99.9% will be fine so long as it's not a suitcase full of iphones of something. I just flew back from my in-laws in Poland with a couple of bikes, albeit my own that i'd left there a couple of years back, and had no issues with customs/charges. Also managed to fit both in one bike bag, too!
most countries have tax relief when you're moving there to live - though might have needed to sort out the paperwork in advance (ToR1 form in the UK, if it's of interest).
RE: taking parts back with you - 99.9% will be fine so long as it's not a suitcase full of iphones of something. I just flew back from my in-laws in Poland with a couple of bikes, albeit my own that i'd left there a couple of years back, and had no issues with customs/charges. Also managed to fit both in one bike bag, too!