Modelo 100 Spain: The Expat Guide to Filing Your Tax Declaration (2026)

The 2026 renta campaign opened on April 8 and runs until June 30. If you have been living in Spain and have crossed the 183-day residency threshold, Modelo 100 is the form you need to know. This guide walks through what it is, who must file, what to include, and where expats most commonly go wrong.

What is Modelo 100?

Modelo 100 is Spain's annual personal income tax return — the equivalent of the UK's Self Assessment or the US Form 1040. It is filed through the IRPF (Impuesto sobre la Renta de las Personas Físicas) system and covers all income you received in the previous calendar year.

The key word for expats is worldwide. As a Spanish tax resident, Spain requires you to declare your global income on Modelo 100 — not just what you earned in Spain. Your UK salary, your Ukrainian rental income, your dividends from an Irish fund — all of it belongs on this declaration.

Who must file Modelo 100?

You are generally required to file Modelo 100 if you are a Spanish tax resident and any of the following apply:

• Your gross employment income from a single employer exceeded €22,000
• You had employment income from more than one employer and the total exceeded €15,000
• You had self-employment income, rental income, capital gains, or investment income above €1,600
• You receive income from abroad that is subject to Spanish tax
• You are registered as autónomo (regardless of income level, autónomos are generally required to file)

Even if your income falls below the thresholds, you may want to file — many expats are entitled to refunds they never claim because they assume they don't need to declare.

When are you a Spanish tax resident?

Spanish tax residency is triggered when you spend more than 183 days in Spain in a calendar year, or when your main economic interests or family ties are based here. Important: residency applies to the entire calendar year, not just from day 184 onwards. Someone who arrived in Spain in June 2025 and stayed through December may well be a tax resident for all of 2025.

If you are uncertain whether you crossed the threshold last year, this is the first thing to clarify — it determines whether you have an obligation at all.

What income do you declare?

Modelo 100 covers five categories of income:

• Employment income (rendimientos del trabajo): Salaries, wages, bonuses — from any country
• Self-employment and business income (rendimientos de actividades económicas): Autónomo earnings, freelance income, professional services
• Capital gains (ganancias y pérdidas patrimoniales): Profits from selling property, shares, crypto assets, and other investments
• Investment income (rendimientos del capital mobiliario): Dividends, interest, investment fund returns
• Rental income (rendimientos del capital inmobiliario): Income from renting out property in Spain or abroad

Beckham Law: a different filing route

If you are on the Beckham Law (Régimen Especial de Impatriados), you do not file Modelo 100. Instead, you file Modelo 151, which applies a flat 24% rate to your Spanish-source income. Under this regime, foreign-source income is generally exempt from Spanish tax.

This distinction matters: if you were told you are on the Beckham Law but have been filing Modelo 100, or vice versa, something has gone wrong and it is worth reviewing before submitting this year's declaration.

Crypto and digital assets: what to declare

Since 2023, Spain has significantly tightened crypto reporting requirements, and 2026 brings another step up with DAC8 enforcement — which requires exchanges to automatically report Spanish users' holdings to the tax authority (AEAT).

Here is what must appear on your Modelo 100 regarding crypto:

• Realised gains and losses: Any sale, swap, or conversion of crypto assets generates a capital gain or loss. This includes selling Bitcoin for euros, swapping ETH for USDC, and using crypto to buy goods or services.
• Staking rewards: Generally treated as income from movable capital, taxable at the time of receipt.
• Mining income: Treated as self-employment income and must be declared through the autónomo system.
• NFTs: Sales of NFTs are generally treated as capital gains. The tax treatment of NFT royalties is still evolving.

Note that Modelo 721 — the declaration for foreign crypto holdings exceeding €50,000 — is a separate form with a March 31 deadline. If you missed Modelo 721 for 2025, you should seek advisory guidance, as penalties start at €10,000.

Common mistakes expats make on Modelo 100

Based on the situations we see regularly in consultations, these are the most frequent problems:

• Not declaring foreign income. "My employer pays tax in the UK, so I don't need to declare it in Spain" — this is incorrect for tax residents. Double taxation treaties prevent you from paying twice, but you still declare everything and apply treaty relief.
• Missing the deduction for double taxation. If you have already paid tax abroad on income that is also taxable in Spain, there is a foreign tax credit available. Many expats who file without guidance leave money on the table here.
• Incorrectly categorising crypto. Each transaction type (sale, swap, staking reward, mining) is treated differently. Lumping everything together as "capital gains" is a common error.
• Using the wrong form (151 vs 100). Beckham Law holders must use Modelo 151. Standard residents use Modelo 100. Filing on the wrong form can require amending the declaration and may trigger a penalty review.
• Missing Modelo 721. If you hold crypto in foreign wallets or exchanges above €50,000, Modelo 721 was due March 31. It is a separate obligation from Modelo 100.

When to seek professional advisory

Modelo 100 is straightforward if your situation is simple — a single salary from a Spanish employer, no foreign income, no crypto, no investments. AEAT's online tool (Renta Web) can pre-fill much of it automatically from data it already holds.

However, a consultation is strongly advisable if you have any of the following: income from outside Spain, cryptocurrency holdings or transactions, rental income from property in another country, you are on the Beckham Law, you have recently arrived or left Spain mid-year, or you are unsure whether you are even a tax resident.

The cost of getting this right is considerably lower than the cost of correcting an incorrect declaration or paying a penalty after the deadline.