Arriving here on a posting
Technicians, engineers and site managers arrive at the chemical complex hired by firms from abroad or moved by their own group. The first consequence is automatic and is not chosen: anyone who stays in Spain for more than 183 days in the calendar year, or places the core of their economic interests here, becomes tax resident and is taxed on worldwide income, not only on what is paid in Spain.
The second is chosen, but against a short clock. Someone moving to Spain under an employment contract may opt for the regime in article 93 of the Spanish personal income tax act, under which they are taxed as a non-resident for the year of the move and the five following ones. The option is exercised on Modelo 149 within a six-month window that is not extended and admits no excuses: miss the deadline and the regime is lost for good. We cover it in the Beckham regime and in the comparison Beckham or the ordinary regime.
In practice that means employment income taxed under non-resident rules for six tax years in all, the year of the move and the five that follow, after which you return to the ordinary regime. It suits some arrivals and not others, which is why the comparison is worth making before the form goes in rather than afterwards.
And those who leave: site work abroad
The opposite movement is just as common. Maintenance and assembly crews spend spells in refineries and plants in other countries while keeping their tax residence here. For them the personal income tax act provides an exemption for employment income earned from work actually carried out abroad, subject to conditions: the work must be performed for a non-resident entity or a permanent establishment abroad, and the territory where it is done must levy a tax of a comparable nature and not be a tax haven. There is also an annual monetary cap, and an alternative excess-payments regime which is incompatible with the exemption, so one or the other has to be chosen.
This exemption is won or lost on the evidence: tickets, timesheets, employer certificates and the days actually spent in each country. Anyone applying it without being able to document the calendar tends to lose it in an inspection, and then come the tax, the interest and a penalty argued separately.
The seaside flat on the day it is sold
The other half of Tarragona is the flat in Salou, Cambrils or Calafell bought in the eighties, used three weeks a year and now up for sale or shared between siblings. Two taxes appear at once, at two different counters.
In income tax, a capital gain on the difference between the disposal value and the acquisition value, which on a property that old is usually substantial and which is not covered by the reinvestment relief, reserved for a main home. And at the town hall, the municipal plusvalía, worked out by two methods of which you pay the lower — but the taxpayer has to make that choice, and nobody will make it for you. If too much was paid, there are four years in which to ask for the self-assessment to be corrected. It is in municipal plusvalía.
Where the flat was inherited and is shared between siblings, those same two taxes reappear on the day they decide what to do with it, and the value fixed in the inheritance is what governs the gain. That is worth knowing before the division is agreed, not after.
Who writes to us from Tarragona
| Who | Their typical matter |
|---|---|
| Technician posted to a plant in the complex | Tax residence acquired on arrival and the six months for Modelo 149 |
| Assembly crew working on sites abroad | The exemption for work carried out abroad and the evidence of days |
| Owner of a flat in Salou or Cambrils | Imputed income for the days at their disposal and the gain on the day of sale |
| Siblings inheriting their parents' flat | Catalan inheritance rules and how to divide it without inflating the bill |
| Retired foreigner with a house on the coast | Which treaty applies to the pension, and Modelo 210 if they are not resident |
How we work with clients in Tarragona
Remotely, with a video call when one is needed and without asking you to travel. With posted workers the first conversation is always about the calendar: when you arrived, how many days you have been out of the country, what you signed and with whom. From that we know whether you are resident, whether you are still in time to opt, and what has to be declared this year.
We work in Spanish, English and French. If your company has its own adviser in the country of origin, we coordinate with them and each of us answers for our own side.
A Tarragona fitter with four months of site work abroad
Resident in Tarragona, with a salary of 48,000 € from a Spanish assembly company. In 2026 he spends 120 days working at a subsidiary's plant in another country, and that work is received and used by the subsidiary, not by the Spanish company. It is the textbook profile for the exemption for work performed abroad, a Spanish income tax relief that exempts the salary earned on those days, and this is how it is calculated with round figures:
| Step | Amount |
|---|---|
| Annual salary | 48,000 € |
| Days actually worked abroad | 120 |
| Share of salary for those days | 15,780.82 € (48,000 × 120/365) |
| Annual cap on the exemption | 60,100 €: not reached |
| Salary taxed under income tax | 32,219.18 € |
| Alternative: the excess travel allowance regime | Incompatible with the exemption; it is calculated too and the better one is chosen |
Things change a great deal if the beneficiary of the work is the Spanish company itself, for instance when it installs abroad a machine it sells, or if the destination country has no tax similar to ours. That is why the first thing we ask for is the contract with the foreign client, not the payslip.
The employer may already have taken the exemption into account when calculating your withholding, or it may not. If it did not, the exemption still applies in the annual return and the result is a refund; if it did and it later turns out not to apply, the return shows tax to pay. What counts is days of actual work abroad; travel days and weekends at the destination are disputed ground, decided on the documented calendar of each trip. In Tarragona, with plants working in shifts and maintenance shutdowns that run on, that calendar rarely matches the payroll one.
The year of those who work at the Tarragona petrochemical complex
| When | The fitter going abroad | The engineer arriving |
|---|---|---|
| During the year | Keep tickets, work reports and boarding passes for each trip | Six months from registering with Spanish social security to file Modelo 149 |
| January | Company certificate with days, countries and the beneficiary entity | Withholding certificate showing the regime applied |
| 1 January to 31 March | Modelo 720 if there are accounts, securities or property abroad above 50,000 € per block | |
| April to June | Income tax return, Modelo 100, with the exemption applied | Modelo 151 instead of the 100 |
Modelo 149 is the election for the special regime for people posted to Spain, often called the Beckham regime, and 151 is the return filed under it. If you are the one arriving, the 149 deadline is unforgiving and is explained in Modelo 149, deadline and paperwork; the form to hand it to us is tell us about your posting.
What almost nobody in Tarragona considers until the tax office asks: on long jobs, the fitter can spend more time abroad than at home. Then the question is no longer whether part of the salary is exempt, but whether he is still resident in Spain. Days alone do not settle it: if the family lives here and the economic interests are here, residence may stay in Tarragona, and if the other country also treats you as resident, the tax treaty resolves it. It is covered in dual residence conflicts.