Spain is complex. We've been handling all of it since 2001.
From your first property search to your last tax return in Spain, Mar and Vicente handle everything personally. Three languages. One team. No handoffs.
Most people who come to us have been told Spain is complicated. They're right — it is. What they need isn't a list of services. They need someone who explains what's happening, flags problems before they become expensive, and stays involved from the first email to the last tax return.
That's what Mar and Vicente have been doing since 2001. We don't just check the documents. We check the property itself on site, before you sign anything. We don't just file the tax return. We model the tax impact before you commit. And we don't disappear once the deal is closed — your annual taxes, your next purchase, your will: we're still here for all of it.
The three areas that bring most of our international clients to us. Each one handled directly by Mar or Vicente: not delegated, not outsourced.
If you're buying, we inspect the property in person before you sign anything: checking its real legal and planning status, not just the paperwork the seller hands over. We handle your NIE, the legal review, contract negotiation, notary representation, and taxes.
If you're selling, the process calls for a different kind of care. We carry out a full legal review before moving forward, including any New Build Declaration that needs to be regularized before signing the deed. We check that the tax withholding the buyer applies is legally correct — not a euro more than it should be. And once the deed is signed, we review the final tax settlement to recover anything owed to you. In most cases, there's money to recover, and we make sure you get it.
Legal support for buying and selling in Spain →Handling an inheritance in Spain from abroad is one of the most stressful situations a family can face: tight deadlines, high taxes, and every document in Spanish. Mar personally handles each step, from the initial asset inventory to the final tax settlement, so your family doesn't have to face the Spanish system alone at an already difficult time. We work in English and German throughout the whole process.
Inheritance lawyer in Spain for foreigners →A Spanish will is one of the most important things you can do for your family before they need it. Without one, your heirs face months of extra paperwork, higher costs, and delays that could have been avoided — all while dealing with a loss. We draft it, sign it before a Spanish notary, and register it correctly. If you already have a will in your home country, that's a good start, but it almost certainly doesn't cover your Spanish assets the way it should. We'll tell you honestly whether you need one here.
Sol-4 isn't a corporate firm. When you hire Sol-4, you work with Mar or Vicente directly: they know your file, they return your calls, and they're the ones sitting across the table at the notary. No associates, no junior staff handling your case.
Lawyer specialised in property law, tax law and inheritance. Mar leads every transaction from due diligence to post-completion — personally. Registered member of the Bar Association of Orihuela (ICAO) · Member of APAZ · Secretary of AAEDI (Spanish Association of Insolvency Law) · Regional Delegate for Alicante, Tax Advisors of the Valencian Community · Member of APAFCV.
Specialist in property transactions and notary representation. Vicente is the primary point of contact for our German and English-speaking clients — handling German natively for clients from Germany, Austria and Switzerland, and conducting the full transaction in English for British, Dutch and other international clients.
We reply within 24 hours, Monday to Friday.
In person or online. We tell you honestly whether we can help and what it'll involve.
We take it from there: documents, due diligence, notary, tax filings, registrations. No hidden fees, no unexpected costs. You receive a clear summary at each stage so you always know where things stand. We translate the legal reality into plain language, because you shouldn't need a law degree to understand what's happening with your own property.
The transaction closes. We don't. Once you own property in Spain, there are taxes, possible rental declarations, future sales, inheritances and wills to plan. Most of our clients have been with us for years — not because they have to be, but because they know that when something changes in their life in Spain, they have someone to call. That's the part we're most proud of.
Two decades of buyers, sellers and business owners on the Costa Blanca — here's what a few of them told us, in their own words.
Mar Bascuñana of Sol-4 Gestión has assisted my wife and I since 2014 with the purchase of three properties in Spain and the sale of two. Throughout this time, Mar has also advised us on our Spanish wills — an essential consideration for UK residents owning Spanish property — and has handled all tax matters arising from the property sales with absolute professionalism.
We have consistently found the service provided by Mar and her team to be both highly professional and genuinely friendly. Their attention to detail is impeccable, and nothing is ever too much trouble. We have complete confidence in the advice we receive and always feel fully informed and supported.
I have also referred several clients to Mar, and without exception their experiences have mirrored our own — efficient, thorough, and reassuring from start to finish.
A special mention must go to Nieves, one of Mar's team members, who is simply marvellous. Nieves is endlessly patient and always takes the time to explain things clearly, which we greatly appreciate. Also, each time we have visited the notary's office, Vicente has looked after Elaine and I, providing further professional reassurance.
We feel very fortunate to have been referred to Mar and her team, and we do not hesitate in recommending that anyone seeking trusted, professional legal and tax advice in the Costa Blanca area speaks with Mar Bascuñana at Sol-4 Gestión.
We have relied on the services of Sol-4 for a number of years. We have found them very helpful and knowledgeable when dealing with our fiscal requirements and conveyancing. Having owned a property in Benimar-Rojales, it was very beneficial to have friendly and expert staff that were local to us. Sol-4 have provided us with excellent service over the years and we are happy to recommend them to anyone.
As a couple we have used Sol-4 Gestión for about 8 years and always been happy with the service and helpful advice given by Mar and all her team. Through setting up a business, house purchase, annual taxation, deaths and so much more they have helped us navigate the Spanish system with honest, direct and straightforward advice. We recommend Sol-4 Gestión completely.
Ever since my arrival in Benijófar in 2020 I have been using the services from Sol-4. This has been for the purchase of houses, assisting on legal matters and arranging all tax matters (Suma etc.). They also helped and assisted some of my friends who arrived in Spain. All of us are very happy to recommend the company and their services — they act very professionally and directly on a very personal level. Mar Bascuñana is a very professional lawyer and knows her cases in all details with the right advice. If you need professionals and help, at Sol-4 you are on the right address, and fully recommended by me.
One team. Every aspect of life and business in Spain. No juggling multiple agencies.
Running a business or working as self-employed in Spain means a constant stream of tax deadlines, quarterly filings and labour obligations. We handle all of it for around 100 active companies and self-employed professionals across the Costa Blanca — so they can focus on the work, not the paperwork.
What we cover: quarterly tax filings, payroll, employment contracts, company formation and full ongoing advisory.
And because paperwork shouldn't mean endless email chains, all documentation is managed through Biloop, our client portal where you upload, track and sign everything in one place. Your numbers, organised. Your time, protected.
Differentiating between TIE for non-EU citizens (e.g. UK, US, Russian) and the EU Residency Certificate for European citizens (e.g. German, Dutch). We handle fast-tracked processing with full representation.
Get yours →Comprehensive tax representation. Annual income tax declarations (Modelo 100) for Spanish residents, and quarterly or annual non-resident tax declarations (Modelo 210) for property owners.
Learn more →Spanish mortgage advice and representation at signing. We coordinate with lenders and the notary so you don't have to.
Find out more →Application, registration and compliance for holiday rental properties on the Costa Blanca.
Get licensed →Everything else you need when you own property or live in Spain.
We'll read it, we'll come back to you within 24 hours, and we'll tell you honestly whether we're the right people to help. No pressure, no commitment.