Ok there was a reply earlier in the thread mentioning the safe amount is £11k. You sure its £10k not £11k?
Are you thinking of the capital gains tax threshold? That's £11,300. There is no safe or unsafe amount. Maybe above ten grand might make them twitch, but if you got paid ten grand by one thousand different bank accounts they'd go loopier than ten and a half from one.
I have suggested that, but it's by no means a number you should rely on.
US transfers of over $10000 get flagged, so like I said it depends on the country. (...) That's why you can never be sure with these things.
(...) They can get suspicious of even much smaller sums than €15k and could ask where you got it from. (crazy!)
If we're talking about a sum of yearly transfers that add to the amount that is below the tax threshold, usually nobody takes interest or tries to block it.
Think of it like this: there are millions of people with bank accounts living in your country and all of those people have some sort of income. You don't want to get targeted or linked to suspicious activity? Try to remain at or below the level of the majority. What that is? You have to answer yourself by looking at the society around you.