The questions, one by one
Do I need an NIE for all of this?
Yes. If you have already bought a house here, you have had one since then.
Almost everyone who asks this already has an NIE and does not know it: without one they could not have signed the deed.
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You have had it since the purchase
The Foreigner Identity Number is compulsory in order to buy property in Spain, open an account or file a return. If you signed a purchase deed, you have an NIE: it appears on the deed itself.
As an identifier it does not expire, although the document evidencing it may carry a date.
If you cannot find the paper
The number is on the deed, in some cases on the IBI bill, and on any previous return. Recovering the document itself is a separate formality, and it is not always needed: for many dealings the number is enough.
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This page was last checked on 4 September 2026
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