Alex
lives on rental income, Costa del Sol
The case at the top of this page.
My old gestor just filed the default return, and I overpaid €9,000. The next year, with Artem, I paid €90.
September 2026
Tax strategy for founders, specialists and investors in Spain
One written plan for your residency, your income, your company and your assets: what you owe, when, and the documents that back each position, ready before Hacienda asks.
Position Review €350 at the founding price, until 15 October 2026 or the tenth client. Or send me four facts on Telegram: within one working day I reply for free with the filings you may have missed and how the penalty works if you file before Hacienda asks.
Real caseAlex, rental income, Costa del Sol+€9,000 a year kept on the same flats
Return prepared by Artem Baranov
| Who filed | How the return was filed | Deduction for renting a home | Result |
|---|---|---|---|
| His previous gestor, one year | from Hacienda's draft, flats without their cadastral references | not claimed | −€9,000paid more than he owed |
| With Sereno, the next year | every flat with its cadastral reference and expenses | claimed | +€9,000a year kept · €90 to pay |
Alex's numbers, published with his permission. What three clients say
People whose money in Spain is more than one Spanish salary, in one of four situations.
A company abroad, run from a laptop in Spain. Where it pays tax, how you pay yourself, and Beckham as a director.
Beckham within six months of starting, and what happens to your tax and your permit if the job ends.
Rent, dividends, crypto and accounts abroad. Every deduction claimed, 720 and 721 filed, wealth tax worked out.
A renewal or a change of permit needs a file that holds up and your returns in order. I prepare both, and a partner lawyer files it.
From clients who paid for my work. Each one approved the wording and agreed to show their name.
lives on rental income, Costa del Sol
The case at the top of this page.
My old gestor just filed the default return, and I overpaid €9,000. The next year, with Artem, I paid €90.
September 2026
founder, moved from Canada
Before. His gestoría in Marbella had not filed his returns.
After. Missing returns filed in time. His residence permit came through.
My gestoría in Marbella never filed my returns. Artem sorted it out in time, and my residence permit came through.
September 2026
founder, MobileXapps · LinkedIn
Before. No tax strategy after the move.
After. A written strategy Artem runs with him.
Artem worked out my tax strategy when I moved to Spain and keeps it running with me. I finally understand what I pay and why.
September 2026
Fear of Hacienda comes from not knowing what it sees and what it will ask. So we start there: what Spain already knows about you, what it can ask, and what you will answer with.
Recently a founder told me his gestor's advice: run everything through the UK company and don't worry. For five years he had lived in Germany on paper and spent long stretches in Spain. Spain counts every one of those days, even part of a day. In residency cases, inspectors have rebuilt a person's year day by day from flight records, card payments and photos posted on social media.
Nothing had happened yet. If Hacienda ever asks, the answer should already be in a folder.
And if the folder shows Spain was home after all, filing first is the cheap way out. On €15,600 of tax for one year, filing and paying five months late on your own adds €702. If Hacienda finds it two years later, it adds €6,181 with every discount, and €12,968 without.
Built in the Position Review, kept current in Sereno Year.
Eight places where not knowing gets expensive, what each one costs and what the plan does first.
What it costsThe Beckham route closes: −€10,800 a year on €120,000 of pay, for up to six years.
What the plan does firstThe route comes first: director of your company, employee, or entrepreneur with an ENISA report issued before you move. Hacienda can check that the role is the reason you moved. Modelo 149 goes in within six months of the start date on your Social Security registration.
What it costsIf the whole business is managed from Spain, Spanish corporate tax on all its profit for up to four past years, with interest and a penalty. If you control it and it pays less than three quarters of what Spanish corporate tax would be, some or all of its profit can be taxed in your hands.
What the plan does firstA written map of where decisions are made and what proves it. One call with your accountant abroad to check it.
What it costsModelo 720 or 721: €20 per data item, −€300 to −€20,000. Half if you file before Hacienda asks.
What the plan does firstYour list from the 31 December balances, filed by 31 March. Missed years filed before a letter arrives.
What it costs19% to 30% of the gain: €26,480 on a €120,000 gain, due by 30 June next year, or 60% then and 40% in November. Your bank asks where the money came from.
What the plan does firstWhen to sell, how your losses count, what to set aside, and the source-of-funds file for your bank.
What it costsSpanish tax on your worldwide income for each year still open, four years from its filing deadline, with interest. Tax paid abroad counts only where the treaty let that country tax you. If Hacienda finds it first, a penalty of 50% to 150% can follow.
What the plan does firstA treaty residence certificate from your other country for each year, proof of your home there, a log of days and a clear start date in Spain. If you file before Hacienda asks, a surcharge of 1% to 15% replaces the penalty.
What it costsIf you get notices electronically, one counts as delivered after ten days, opened or not. The letter sets the deadline to reply, and it can be as short as ten working days.
What the plan does firstWith a power of attorney that covers notices, they reach me too, and I prepare the reply.
What it costsA self-employed permit is renewed only if your tax and Social Security are in order. Switch from your job to self-employment and Beckham ends.
What the plan does firstReturns and Social Security in order well before renewal day, and the tax side of any change of job or permit worked out before you make it. For the renewal or the change I prepare the file, business plan included, and a partner lawyer files it.
What it costsRent filed from Hacienda's draft loses the deduction for renting a home, 50% to 90% of the net rent: one client lost −€9,000 in a year. Returns that were never filed can hold up a residency renewal.
What the plan does firstI ask before I file: every property, account and income, with its documents. Missed returns go in before anyone asks.
Seven questions, about a minute. Your answers build your list of forms and dates, and they stay in your browser unless you send them to me.
Filled in for the made-up founder D. K. Change any answer.
Missing Modelo 720 or 721 costs €20 per data item, €300 minimum, up to €20,000. Half if you file late before the tax agency asks.
A quick self-check for orientation. Advice on your case comes in a session. Rules as in force on 29 September 2026, each linked to the law. 2027 dates follow the usual calendar and the tax agency confirms them each spring. Tax treaties, exemptions and valuations can change the result.
For Sereno Year members. The sereno walked the street at night calling the hour. The app tells you what is due and what changed.
Tuesday 13 October
Every filing and payment date, with a reminder two weeks before.
Works today, in your calendarForward a letter from Hacienda. You get what it asks, the deadline and the next step, checked by me.
Today by messageLog your trips and see your count against 183 before it decides your residency.
BuildingA draft return, a bank statement or an exchange report: what is missing before you file.
BuildingYou sold crypto: how much to set aside. A trip took you past 150 days: what changes.
BuildingResidency certificates, your travel log, company papers and source of funds, in one place.
BuildingModelo 130 and 303 every quarter, by 20 April, 20 July, 20 October and 30 January, with your invoices and expenses checked before you file.
BuildingThe first ten members decide what gets built first.
Prices include 21% VAT. Every task has a fixed price agreed before work starts. Founding prices hold until 15 October 2026 or the tenth client, whichever comes first.
| ConsultationOne question, one hour | Position Review Start hereYour whole position on paper | Sereno YearThe review, then twelve months | |
|---|---|---|---|
| Founding price | €150standard €180 | €350standard €450 | €150a month12-month plan, €1,800 in total. Or €1,500 paid for the year, two months free.standard €190 a month (€2,280) or €1,900 a year |
| Sessions | one, 60 minutes | two, 60 and 45 minutes | two, then four calls on the tax calendar |
| In writing | a summary within 24 hours | a full plan within three working days of your documents | the plan, kept up to date |
| Your dates in your calendar | Not included | Included | Included with reminders |
| Call with your accountant abroad | Not included | Included | Included |
| Questions by message | Not included | two weeks | twelve months, reply within one working day |
| Personal filings: Renta, 720, 721, 714, 151 | Not included | Not included | Included |
| Reply to a letter from Hacienda | Not included | Not included | first one included |
| Sereno app | Not included | Not included | Included early access |
| Sobremesa, the founders' table | Not included | Not included | Included |
| If it did not help | a refund, if you tell me within 24 hours | after session one, pay €150 and get the rest back | if I reply later than one working day, that month's fee comes back (€125 on the yearly price) |
| Credit | in full toward a review or Sereno Year within 30 days | in full toward Sereno Year within 30 days | Not included |
| Book a consultation | Book a review | Start Sereno Year |
means not included. Sereno Year covers up to three income sources, ten positions on 720 or 721 and one company. For more, for DeFi or a second company, I quote a fixed price first.
Sobremesa is the Spanish hour after lunch when nobody leaves the table.
Ours is a private group of founders I work with. At the table:
Included in Sereno Year. Not a client yet? Ask, and I introduce you to the table.
Ask for a seatNo. I am a tax adviser, which in Spain is an open profession, and filings for a client go through a power of attorney registered with the tax agency. Court cases need a lawyer and deeds need a notary. For those I find one and hand over the file.
No. You register a power of attorney from your own Cl@ve in about ten minutes, for named actions and a fixed term, and you can revoke it yourself. If it covers notices, electronic letters from Hacienda reach me too.
A one-page agreement you read before paying. It sets what I answer for, what you answer for and the date your documents are due.
I calculate the gain, file Modelo 721 and prepare the source-of-funds file your bank asks for. Spanish tax advisers must check where money comes from (Law 10/2010), so we start with your identity and the source of funds. If the origin cannot be shown, I tell you in the first call.
A law firm for court cases and company deals. A local gestoría for company books and payroll. A tax app if your income is one Spanish salary and nothing abroad. I say so in the first call if that is your case.
By video, or in person on the Costa del Sol. You pay by bank transfer against an invoice before the first session.
Yes. I prepare the file with you: the documents and, for a change of permit, the business plan. A partner lawyer files the application, and I stay your one contact until the decision. The tax side comes with it: returns and Social Security in order, and what the change means for your tax.
It can. Spain has no split year. On the regular rules, if you are resident in the year you arrive, Spain taxes your worldwide income for that whole year, including the months before the move. Under Beckham it works differently. Big sales are best timed before that year starts.
Yes, Modelo 151 every year in the Renta window. Modelo 720 is not required under Beckham. The tax agency's guidance does not cover Modelo 721 under Beckham, so we decide it case by case.
I live on the Costa del Sol and work in English and Russian. Until now I have helped people who moved to Spain with residency and autónomo paperwork. Sereno is the tax side of that work.
I sell no financial products and take no commissions. When your case needs a lawyer, a notary or your accountant abroad, I find one or talk to yours and hand over the file.
Two sessions and a written plan, €350 until 15 October 2026 or the tenth client.