How do I move a large amount (say NOK 2–5M) from Norway to Portugal safely?

The transfer itself is the easy part — the documentation is the deal. Portuguese banks WILL ask where the money comes from (AML), so prepare the paper trail before sending: tax returns, the sale contract or inheritance documents behind the funds. Then mind the mechanics: bank FX spreads on millions are real money (specialist FX brokers routinely save 0.5–1%), large single transfers beat many small ones for both cost and AML optics, and the timing relative to your residency change can matter for reporting. What goes wrong in practice is always the same: money arrives, documentation doesn't, account freezes.