Modelo 718 is the annual online return for Spain's Impuesto Temporal de Solidaridad de las Grandes Fortunas (ITSGF), the state-level Solidarity Tax on Large Fortunes created by Ley 38/2022. You only have to file it if your net wealth exceeds €3,000,000 and the resulting calculation, after the exempt minimum and any deductions, produces a cuota a ingresar — an amount actually payable. Crossing the €3 million line alone does not create a filing obligation, per Art. 3.Diecinueve of Ley 38/2022. For the 2025 tax year, filing runs from 1 to 31 July 2026, exclusively online via Cl@ve, a digital certificate, or DNI electrónico. A June 2026 order, Orden HAC/652/2026, replaced the official form to extend the tax's 60 percent income cap to non-resident owners of Spanish assets for the first time.
What is Modelo 718?
Modelo 718 is not a tax in itself. It is the AEAT return used to declare and self-assess the Impuesto Temporal de Solidaridad de las Grandes Fortunas (ITSGF) — a state tax, complementary to Wealth Tax, that applies to individuals with net wealth above €3,000,000. It cannot be transferred to the regions, which is precisely the point: it exists to reach the portion of wealth that regional Wealth Tax rebates, such as Madrid's, would otherwise let through untaxed.
For investors and high-net-worth individuals with Spanish assets, this is worth understanding on its own terms, separately from Wealth Tax itself. Two people can hold identical Spanish property portfolios, pay identical Wealth Tax, and still end up with different Modelo 718 outcomes purely because of where they live, how their assets are structured, or which CCAA administers their regional bonificación. The filing act — not just the underlying tax rate — is where those differences actually surface.
The form behind the Solidarity Tax
The tax itself comes from Ley 38/2022, which built it deliberately to mirror Wealth Tax (Impuesto sobre el Patrimonio): the same territorial scope, the same exemptions, the same taxpayer categories, the same rules for determining the tax base. The one meaningful difference is the threshold. Wealth Tax can apply from far lower net-wealth levels depending on the region, while the Solidarity Tax only engages above €3,000,000, with the first €3,000,000 itself taxed at 0 percent.
Modelo 718 was approved by Orden HFP/587/2023, which made it an electronic-only return from the outset — there has never been a paper version. This guide focuses on the filing act itself: who has to submit it, the exact procedure, and what changed in 2026. It does not cover the tax's rate bands or regional mechanics; for those, see our Wealth Tax guide, since the Solidarity Tax exists specifically to claw back what regional bonificaciones like Madrid's 100 percent rebate would otherwise let through.
What changed on 29 June 2026
On 29 June 2026, the BOE published Orden HAC/652/2026, which replaced the Modelo 718 annex in full. The change traces back to two Tribunal Supremo rulings from late October and early November 2025, which held that denying non-residents the tax's 60 percent income cap breached the EU's free movement of capital. The Tribunal Económico-Administrativo Central applied the same reasoning specifically to the Solidarity Tax in two resolutions issued on 18 December 2025, and the new form incorporates that doctrine directly.
For anyone filing this July, the practical effect is real: non-resident owners of Spanish property or investments can now apply the same cap that residents have used for years. The section below explains exactly who benefits and how.
Who must file
The €3,000,000 threshold gets most of the attention, but on its own it is not the filing trigger. The actual rule is narrower, and getting it wrong in either direction costs money — either an unnecessary filing or, worse, a missed one.
The €3M threshold is necessary but not sufficient
Under Art. 3.Diecinueve of Ley 38/2022, you are only obliged to file Modelo 718 if your tax liability, once the exempt minimum and any deductions have been applied, results in a cuota a ingresar — an amount you actually owe. Simply holding net wealth above €3,000,000 does not, by itself, create a filing obligation.
Not every net worth above €3M triggers Modelo 718. The obligation depends on whether the calculation results in an amount payable, not on the €3M figure alone.
Source: Ley 38/2022, Art. 3.Diecinueve
This differs from Wealth Tax itself. Modelo 714 has a second, independent trigger: even when the resulting tax is zero, you must still file if your gross assets exceed €2,000,000. Modelo 718 has no equivalent clause — see the comparison below.
Residents vs non-residents — obligación personal vs obligación real
Spanish tax residents declare under obligación personal, meaning worldwide net wealth counts toward the €3,000,000 threshold. Non-residents declare under obligación real, counting only assets and rights located in Spain — typically real estate, shares in Spanish companies, or Spanish-sited investment accounts. Non-residents also lose the €700,000 mínimo exento that residents apply before reaching the taxable base, which in practice brings their effective threshold closer to the bare €3,000,000 figure. For how Spain determines who counts as a tax resident in the first place, see our guide to Spanish tax residency.
A non-resident who owns a single Marbella property valued at €4,000,000, for instance, has no other Spanish-sited assets to add and no foreign holdings to worry about — the calculation only ever looks at that one property. A Spanish resident with the same net wealth spread across a Spanish home, a foreign brokerage account and a foreign pension, by contrast, brings all of it into scope. The obligación real / obligación personal distinction is usually the single biggest factor in whether an individual files at all.
The 2026 escudo fiscal extension to non-residents
Until this year, only obligación personal taxpayers could apply the law's 60 percent income cap — the rule that stops the combined bill from IRPF, Wealth Tax and the Solidarity Tax from exceeding 60 percent of IRPF taxable income, with a floor at 20 percent of the Solidarity Tax's own quota. Orden HAC/652/2026 removed that restriction from the form, following the Tribunal Supremo and TEAC doctrine described above. A non-resident with Spanish property who was previously denied the cap can now apply it in the same way a resident always could.
Since Orden HAC/652/2026, non-resident owners of Spanish assets can apply the same 60% income cap on their combined tax bill that residents have used since 2022.
Source: Ley 38/2022, Art. 3.Doce.1; Orden HAC/652/2026
For the first time, non-resident owners of Spanish assets can apply the same 60% income cap that residents have used for years.
| Modelo 714 (Wealth Tax) | Modelo 718 (Solidarity Tax) | |
|---|---|---|
| Filing trigger | Cuota a ingresar, or gross assets over €2,000,000 | Cuota a ingresar only |
| 2026 filing window | 2 April to 30 June | 1 to 31 July |
| Direct-debit cutoff | Set annually by AEAT order | 26 July (charged 31 July) |
| Credited against | Not applicable | Wealth Tax actually paid is deducted from the amount due |
How to file
Modelo 718 has no paper option. Everything happens through AEAT's Sede Electrónica, and the sequence matters — file it out of order and you either duplicate work or miss the credit mechanism that avoids double taxation.
Before you file — reconcile with Modelo 714
The Solidarity Tax is deliberately structured so you never pay twice. Once your Modelo 718 liability is calculated, you deduct the Wealth Tax actually paid for the same year, in the same region. In practice, this means finalising your Modelo 714 position first, even if your region reduces it to zero, as Madrid and Andalucía do — because the deduction is based on the Wealth Tax actually satisfied, not the amount before regional bonificaciones are applied.
This ordering trips people up more often than the deadline itself. Filing Modelo 718 before your Modelo 714 figure is final means recalculating from scratch once the Wealth Tax return settles, since any change to what you actually paid changes the credit you are entitled to claim.
The electronic filing steps
Filing Modelo 718 for the 2025 tax year
Confirm you owe something
Run the calculation with the exempt minimum and any deductions applied. If nothing results a ingresar, you most likely have no filing obligation.
Gather your Modelo 714 position
Have your Wealth Tax return and payment confirmation ready. The amount effectively paid is credited against your Solidarity Tax bill.
Access Sede Electrónica
Identify yourself with Cl@ve, a digital certificate, or DNI electrónico. There is no paper alternative for this form.
Complete and submit
File between 1 and 31 July. If paying by direct debit, submit by 26 July instead; the later window applies only to other payment methods.
Keep your confirmation
Save the CSV code and the número de justificante from the response screen in case AEAT later requests supporting documentation.
Deadlines that actually matter
Two dates run in parallel, and it is easy to confuse them. The general filing window is 1 to 31 July 2026. If you are paying by direct debit (domiciliación bancaria), you must submit by 26 July; the funds are then charged from your account on 31 July. Filing between 27 and 31 July is still possible, but only with a payment method other than direct debit.
Paying by direct debit? File by 26 July, not 31 July. The account is charged on 31 July regardless, but that payment method's submission window closes five days earlier.
Source: AEAT Sede Electrónica, ayuda técnica Modelo 718
Last verified: Jul 2026
Missing the deadline entirely, with no prior request from AEAT, triggers the standard extemporaneous-filing surcharge under Art. 27 of the Ley General Tributaria: 1 percent plus a further 1 percent for each full month of delay, up to 12 months; beyond that, a flat 15 percent plus late-payment interest from month 13 onward. If AEAT contacts you first, the regime is less forgiving: a formal penalty applies instead, calculated as a percentage of the unpaid amount rather than the milder surcharge.
How ApexTax helps investors and HNWIs
ApexTax works as a Cross-Border Relocation Strategist and Single Point of Contact for investors and high-net-worth individuals navigating Spain's tax residency rules, including how Wealth Tax and the Solidarity Tax interact with your specific structure, whether that is Spanish real estate, company shareholdings, or a Beckham Law position. We map which filings actually apply to you before July, coordinate with an independent qualified gestor or asesor fiscal for the calculation and submission itself, and track changes like the 2026 order described above so they don't catch you mid-cycle.
Implementation of Modelo 718 — the calculation, submission, and any representation before AEAT — is delivered by independent qualified Spanish tax professionals selected and coordinated by ApexTax. We do not file the return ourselves or act as your tax representative.