If you have just moved to Portugal, start with this order: NIF, address setup, bank account, NISS, and healthcare registration . The NIF unlocks the most things early, because it is commonly needed for contracts, banking, and tax-facing tasks. After that, your Portuguese address and matching paperwork make the rest much smoother. For some eligible foreign nationals with a Portuguese address, there is now also a joint service  that lets you request the NIF, NISS, and SNS numbe