The Spain Relocation Glossary: Every Acronym, Explained

NIE (Numero de Identidad de Extranjero)

Your foreigner identification number, the single most important piece of admin in Spain: bank accounts, contracts, utilities and every tax filing hang off it. Everyone who buys, works, studies or resides in Spain needs one. You apply at a national police extranjeria office with form EX-15, or via a Spanish consulate abroad; the government fee is 9.84 EUR, paid at a bank with Modelo 790 codigo 012.

Gotcha: the NIE is a number, not a residence permit, so having one proves nothing about your right to live in Spain. Full walkthrough in our NIE guide.

TIE (Tarjeta de Identidad de Extranjero)

The physical biometric card that proves residency for non-EU nationals; it carries your NIE number, photo and fingerprints. Non-EU residents staying more than six months need one. It is issued at designated police stations after your visa or residency approval, via cita previa.

Gotcha: EU citizens do not get a TIE, they get the green NIE certificate instead, and no amount of queueing changes that. Details in our TIE card guide.

DNI (Documento Nacional de Identidad)

The national identity card for Spanish citizens. You will never have one as a foreign resident, yet half the web forms in Spain ask for it. Where a form demands a DNI, your NIE goes in that box; if the form rejects the letter format, the form is broken, not you, a real and recurring problem with older Spanish websites.

NIF (Numero de Identificacion Fiscal)

Your tax identification number with Hacienda. For Spaniards it is the DNI; for foreign residents the NIE doubles as the NIF in practice once you register with the tax agency (see Modelo 030 below). Anyone with tax obligations needs one, which means everyone who lives or owns property here. Gotcha: a non-resident buying property needs the NIF/NIE sorted before signing anything at the notary.

CIF (Codigo de Identificacion Fiscal)

The old name for a company's tax ID. It was formally abolished in 2008, companies now simply have a NIF, but Spaniards still say CIF constantly. If a supplier asks for your CIF, they want your company's NIF; if you are a sole trader, they want your personal NIE/NIF.

NUSS (Numero de la Seguridad Social)

Your social security number, needed before you can legally work, register as autonomo, or build up contribution-based rights. You get it once, for life, from the Tesoreria General de la Seguridad Social (TGSS), in person or online with a certificado digital or Cl@ve. Gotcha: employers often assume you already have one, so sort it before your first contract, because without it your registration as an employee cannot be filed. Our NUSS guide walks through the TA.1 application step by step.

Empadronamiento / padron

Registration on your town hall's municipal census, the official proof that you live at your address. It unlocks the SIP health card, school enrolment and reduced public transport fares, and many procedures ask for a certificate less than three months old. Done at the ayuntamiento, usually in one appointment.

Gotcha: you can and should register even from a room rental or with a host's authorization; you do not need to own the flat or be the named tenant. Step by step in our empadronamiento guide.

Cita previa

A prior appointment, the gateway to almost every government office, from extranjeria to Hacienda, booked online per office and per procedure. Gotcha: for NIE and TIE appointments in Valencia, slots vanish within minutes of release; our cita previa hacks cover the release windows and workarounds that actually help.

Certificado digital / Cl@ve

Spain's two systems for proving your identity online. They turn week-long queues into ten-minute web forms: tax filings, padron certificates in many municipalities, social security records. Residents get the certificado digital via the FNMT website plus one in-person verification, and Cl@ve at registration offices. Gotcha: most new arrivals cannot use either yet, since both require a NIE first, so plan your first months around in-person appointments and get the certificate as soon as you can.

Gestoria

A private admin office, staffed by gestores, that files paperwork with the Spanish authorities on your behalf: taxes, autonomo registration, vehicle transfers, renewals. They are not lawyers; think licensed bureaucracy navigators. Anyone can hire one and most Spaniards do.

Gotcha: quality varies enormously and few speak English, so a personal recommendation matters more than a shiny website. Our admin support service plays this role for relocations, in your language.

Fianza

The legal rental deposit: one month's rent for a long-term housing lease, which the landlord must lodge with the regional deposit authority. Every tenant pays it. Gotcha: the fianza is rarely the whole move-in cost, since landlords commonly ask one to two extra months as additional guarantee plus an agency fee, so plan three to four months of rent upfront before you sign. Full picture in our renting guide.

Arras

The earnest-money contract signed when buying property, typically 10% of the price, paid to take the home off the market. If you withdraw, you forfeit it; if the seller withdraws, they owe you double. Gotcha: never sign arras before your lawyer has checked the property's registry entry and debts, because your deposit is at stake from that moment. See our property buying guide.

ITP (Impuesto de Transmisiones Patrimoniales)

The transfer tax on resale property, around 10% of the purchase price in the Valencia region, filed with Modelo 600 within 30 working days of the transaction. Every buyer of a second-hand home pays it (new builds pay IVA instead). Gotcha: budget it on top of the price; on a 250,000 EUR apartment that is roughly 25,000 EUR in tax alone.

IBI (Impuesto sobre Bienes Inmuebles)

The annual municipal property tax, roughly 300 to 800 EUR a year for a standard Valencia city apartment, billed by the ayuntamiento to whoever owns the property on January 1. Gotcha: unpaid IBI follows the property, not the seller, so always confirm it is paid up before you buy.

Modelo 030

The census form that registers you with the Agencia Tributaria (AEAT) and links your NIE to the tax system. File it before any other tax filing, shortly after arriving. Gotcha: skipping it quietly breaks later filings; it costs nothing and takes minutes with a gestor. Context in our Spain tax guide.

Modelo 100

The annual income tax return (the IRPF declaracion de la renta), filed in the spring campaign, roughly April to the end of June, for the previous calendar year. Tax residents with income above the filing thresholds file it. Gotcha: your first Spanish return is the one where cross-border income, double-tax treaties and the Beckham regime all collide, so it is worth professional help at least once.

Modelo 720

The informational declaration of foreign assets: Spanish tax residents must report foreign bank accounts, investments and real estate when any category exceeds 50,000 EUR. Deadline: March 31 each year. Since Law 5/2022, after the ECJ ruling, the infamous per-data-point fines are gone and penalties mirror standard tax-information rules, but filing remains mandatory. Full detail in our Modelo 720 guide.

Autonomo

Spain's self-employed status. Freelancers and sole traders register with both Hacienda and the Seguridad Social, then pay a monthly income-based cuota and file quarterly VAT and income declarations. Gotcha: the tarifa plana gives new autonomos a flat 87 EUR per month cuota for the first 12 months, but you claim it at registration, not later. Our autonomo guide walks through the whole registration.

SIP card (Sistema de Informacion Poblacional)

The Valencian health card that identifies you in the regional public health system; you show it at every centro de salud, hospital and pharmacy interaction. Anyone entitled to public healthcare in the Valencian Community gets one at their local centro de salud. Gotcha: the padron comes first, so no empadronamiento, no SIP. How access works is covered in our healthcare guide.

Convenio especial

A pay-in scheme run by the regional health services that lets residents without another route into public healthcare buy in with a monthly fee, after at least a year on the padron. Mostly relevant to early retirees and non-working residents whose visa required private insurance. Gotcha: it covers care within the public system but not everything, prescription subsidies are excluded, so compare it honestly against private cover.

Formulario S1

The EU coordination form that lets state pensioners, and some posted workers, from the UK and EU register for Spanish public healthcare with their home country paying the bill. If that might be you, read our S1 form guide.