system
A chat on subreddit /r/pcmasterrace
human
No. Even countries with the strictest import laws won't tax you for bringing in something from another country just cause it was cheaper there. You can also just not declare it. Usually you only have to declare things you are looking to sell or make a profit from. Not stuff you bought for personal use.

Edit: I can tell I am being downvoted by people who have never been to another country. My comment is literally how custom declaration works.

Edit: some DaleGribble312 responded and immediately blocked, guess he knew he was talking out his ass. In the event he sees this. Of I go into a country with a brand new laptop worth say $5000, you really think customs is going to tax me? No, they won't. Same for a desktop, or even a computer part. In fact, airlines recommend if you are transporting a desktop to transport it in its individual components to prevent any damage. By your logic every time I have taken a desktop to another country (more times I care to count) customs has just let me walk away with hundreds of dollars worth of tax not paid. You have clearly never flown and never seen shit.

Edit2: a lot of you people clearly do not know how this shit works. By a lot of your logics, anyone traveling out of the US with any new apple product, or expensive gaming laptop, or even a gaming rig, would have to pay taxes upon entering another country. That's not how that shit works at all. The fact you do shows that you have likely never flown anywhere that actually required passing customs, or you are an idiot and paid taxes on something you didn't have to.
gpt
Except Australia. We’re taxed 10%(this is ourGoods and Services Tax similar to the VAT in the UK) on anything with a value &gt;$1000AUD at the border. 

This came about as one of the country’s biggest retailers got his knickers in a twist that his price gouging bricks and mortar stores were being less successful with their price gouging as people started realising many goods are cheaper online and over seas.