Modelo 720: declare your foreign assets correctly and avoid penalties

What Modelo 720 is — and what it is not

Modelo 720 is an informational declaration, not a tax return. Filing it does not by itself create a tax liability. Its purpose is to inform the Spanish Tax Authority (AEAT) about the existence, ownership, and approximate value of assets held outside Spain by Spanish tax residents. The AEAT then cross-references this data against income tax returns to verify that foreign-source income (interest, dividends, rental income, capital gains) is being correctly declared.

The three categories are assessed independently:

1. Foreign bank and savings accounts — valued at the balance on 31 December and the average balance for Q4
2. Securities, investments, and financial assets held at foreign brokers, insurers, or pension managers
3. Real estate outside Spain — valued at acquisition cost or cadastral equivalent

Each category is assessed at 50,000 euros independently. A taxpayer with €45,000 in a foreign bank account and €40,000 in foreign securities has no obligation — neither category exceeds the threshold. A taxpayer with €55,000 in foreign securities and €30,000 in a foreign bank account must declare the securities category but not the accounts.

The 2022 reform: what changed and what did not

The European Court of Justice ruling in January 2022 (Case C-788/19) fundamentally changed the penalty landscape. Spain’s original penalties — a fixed minimum of €1,500 per asset class with no cap, plus a 150% punitive surcharge with no statute of limitations — were found to violate EU law. The reforms that followed:

• Replaced the 150% surcharge with standard late-filing surcharges (5%, 10%, 15%, or 20% depending on delay)
• Applied the normal four-year statute of limitations to Modelo 720 infractions
• Removed the presumption that undeclared foreign assets represented undisclosed income

This does not mean the obligation is now trivial. Late filing still carries surcharges, and the AEAT continues to use Modelo 720 data as a primary tool for identifying undeclared income. The change is that the consequences are now proportionate rather than punitive.

Modelo 721: the crypto parallel obligation

Since 2024, Spanish tax residents must separately declare virtual assets held at foreign service providers on Modelo 721. The same 50,000-euro threshold applies, and the same 31 March deadline. The form requires identification of each asset type (Bitcoin, Ethereum, stablecoins, NFTs), the platform or wallet holding them, and the total value on 31 December.

Self-custody wallets — hardware wallets, software wallets, paper wallets not held through a platform — are also within scope if the aggregate value exceeds the threshold. This is a significant compliance challenge for active crypto holders, and BMC has developed specific procedures for reconstructing valuations and documenting wallet holdings.

Planning considerations for new Spanish residents

If you are planning to become a Spanish tax resident and have significant foreign assets, the period immediately before your residency begins is the optimal time to review your portfolio. Assets that are rearranged while you are still a non-resident have different consequences from rearrangements made as a resident. BMC’s pre-arrival planning service addresses Modelo 720 obligations alongside IRPF entry planning, Beckham Law eligibility, and wealth tax exposure.

Common mistakes we correct

• Valuing at cost rather than market value for securities — AEAT requires market value at 31 December
• Omitting employer equity schemes — unvested options and RSPs held at foreign brokers count
• Ignoring foreign life insurance with an investment component — these fall under Category 2
• Not filing an update declaration when a portfolio grows beyond the 20,000-euro annual increase threshold
• Inconsistencies between Modelo 720 and IRPF — the most common audit trigger

Voluntary regularisation: the case for filing now

For Spanish tax residents who have not filed Modelo 720 in prior years and are aware of the obligation, voluntary regularisation before the AEAT initiates proceedings is almost always the correct financial decision. The mathematics are clear:

Before AEAT contact: Late filing attracts surcharges of 5% (within 3 months), 10% (3-6 months), 15% (6-12 months), or 20% (after 12 months), plus interest at 3.75% per year. No additional penalties for the failure to file itself, following the 2022 reform.

After AEAT contact: Once the AEAT issues a notice (requerimiento) for the outstanding declaration, the voluntary disclosure surcharges no longer apply. Penalties for tax evasion can reach 50-100% of the underlying tax debt, plus interest. Where the AEAT imputes undisclosed income to undeclared assets (a legitimate tool under the IRNR framework), the combined liability can be multiples of the original omission.

The practical trigger for voluntary regularisation is frequently not financial calculation but an external event: a change of tax advisor who discovers the gap, a notarial requirement for a certificate of tax compliance on a property sale, or a bank request in connection with a mortgage or financial transaction. BMC has managed voluntary regularisations for clients in each of these situations and consistently achieves significantly better outcomes than the enforcement alternative.

Modelo 720 for new Spanish residents: the first-year priority

Individuals who become Spanish tax residents for the first time — whether relocating for work, retirement, or under the digital nomad visa — frequently arrive with complex foreign asset portfolios: pension accounts, brokerage accounts, property in the home country, investment funds, and increasingly, cryptocurrency holdings.

The Modelo 720 (and 721) obligation arises for the year in which residency is first established. An individual who becomes Spanish resident in 2026 must file for the 2026 tax year by 31 March 2027. This timeline must be established at the outset of the residency planning process, not discovered in February 2027.

BMC provides a dedicated Modelo 720 first-year review for new residents, typically as part of the broader pre-arrival planning engagement. We inventory all foreign assets, apply the threshold analysis, and prepare both the Modelo 720 and the annual IRPF return consistently — so that income declared on the income tax return corresponds exactly to the assets declared on the information return, and no AEAT inconsistency flag is triggered.

US retirement accounts and the Modelo 720 question

US nationals relocating to Spain frequently ask whether their US retirement accounts — 401(k), IRA, Roth IRA, SEP IRA — are reportable on Modelo 720. The answer requires care:

IRAs and 401(k)s held at US financial institutions are generally reportable under Category 2 (securities and financial assets at foreign institutions) if the value exceeds €50,000. The AEAT considers these to be investment accounts even if the funds have not yet been drawn down.

Roth IRAs present a particular complexity: under Spanish law, the Roth IRA has no special tax status — it is treated as a foreign investment account. Future distributions from the Roth, which are tax-free in the US, are potentially taxable in Spain as income. The US-Spain tax treaty’s pension provisions do not clearly cover Roth IRAs, and the AEAT has not issued definitive guidance. BMC advises US clients to take a conservative position and report Roth IRAs on Modelo 720, while monitoring AEAT guidance on the treaty treatment of future distributions.

FBAR interaction. US nationals are also required to file a Foreign Bank Account Report (FinCEN 114, FBAR) with the US Treasury for foreign financial accounts — including Spanish bank accounts — above $10,000 at any point in the year. This is separate from Modelo 720 and has different thresholds and penalties. BMC coordinates both the Spanish and US reporting obligations for US national clients to ensure consistency.

Consistent reporting between Modelo 720 and IRPF: why it matters

The AEAT’s cross-checking capabilities between Modelo 720 and the annual IRPF return are the primary enforcement mechanism for foreign asset compliance. The AEAT’s systems automatically flag specific categories of inconsistency:

Interest income discrepancies. If a bank account declared on Modelo 720 shows a balance of €200,000 and the AEAT’s interest rate benchmarks suggest the account should generate €3,000-4,000 in annual interest, but the IRPF return declares no foreign bank interest, the system flags this as an inconsistency requiring explanation. The burden is on the taxpayer to show either that no interest was earned (e.g., a zero-rate current account) or that it was correctly declared elsewhere.

Capital gains without corresponding asset disposal. If a property declared on Modelo 720 in one year does not appear in the following year’s declaration (suggesting it was sold), the AEAT expects a corresponding capital gain declaration on the IRPF. Missing this connection triggers an automatic review.

Dividend income from foreign securities. Securities declared on Modelo 720 generate a presumption that the holder receives dividends or distributions. If the foreign company’s public dividend history is known to the AEAT (through CRS data), undeclared dividend income is easily identified.

Large increases in foreign asset values without a corresponding income declaration. If a Modelo 720 update shows a category’s value increasing by €500,000 from one year to the next without a corresponding gift, inheritance, or capital gain declaration on IRPF, the AEAT may impute the increase as undisclosed income.

BMC’s approach is to prepare both Modelo 720 and the annual IRPF return as a single coordinated exercise, ensuring that every asset declared on 720 has a consistent treatment of its income on the IRPF return, and that every capital event reflected in changing 720 values is correctly reported on the income side. This integrated approach is the most effective protection against the inconsistency flags that trigger AEAT scrutiny.

When should I file Modelo 720 for the first time?

If you are a Spanish tax resident who has not previously filed Modelo 720 and you have foreign assets above the threshold, the question is not whether to file but when — and the answer is as soon as possible.

The AEAT receives CRS data from foreign financial institutions covering the calendar year in which you became Spanish tax resident. If you became resident in year N and had foreign accounts above €50,000, the AEAT likely already has that data from year N. Each additional year of non-filing increases both the accrued surcharges and the risk that the AEAT initiates proceedings before you file voluntarily.

BMC recommends a systematic approach:

1. Inventory all foreign assets as of 31 December of each year you were Spanish resident
2. Calculate whether any category exceeded €50,000 in any year
3. File the outstanding declarations starting with the most recent year, working backward through the statute of limitations period
4. Simultaneously ensure IRPF returns for the same years correctly reflect foreign-source income from those assets

This approach achieves voluntary disclosure status — with its materially lower surcharge structure — for all years and eliminates the risk of the AEAT finding undisclosed assets before the filing is complete.