Does Spain or the US tax my pension first?
Ask two questions in order: where does the income arise, and where do you live. The country of source normally has the first claim, and the country of residence taxes the same income afterwards while giving relief for what the first country took. For a US person living in Spain both returns are in point whichever way the first claim falls, because that filing obligation does not end at the border. Getting the order the wrong way round is what produces a double charge on paper: relief claimed in the country that should have taxed first is usually refused.
Which country do I claim the foreign tax credit in?
In the country with the second claim, not whichever return you happen to prepare first. The treaty decides which country taxes the income first; the other one relieves. If you claim relief in the country that held the primary right, you are asking it to give up tax the treaty gave it, so the claim fails while the other liability stays due. The practical effect is that the order of the filings follows the order of the claims: settle the first country liability, then use that figure in the second return.
Why is my Spanish tax different from a friend in another region?
Because Spain is not one tax position. Regional rules vary, and two residents with identical income can face different outcomes depending on where in Spain they are registered. That matters on this corridor for two reasons. First, the Spanish figure is the one your relief claim depends on, so an assumption about the regional position feeds straight into the other country return. Second, a move within Spain can change the answer without anything about your income changing. Establish the regional position from your own registration before either return is prepared.
Do I pay Spanish tax on my US rental property?
As a resident of Spain, property income from abroad generally comes into your Spanish position, but the country the property sits in holds the first claim on it. So the letting is taxed where the property is and then again where you live, with relief for the first charge. Separately, holding assets outside Spain can trigger reporting that has nothing to do with tax being due. The order matters more than the rates here: the charge at the property location is computed first, and the Spanish return relieves it.
I moved back to Spain from the US, who taxes me now?
Residence decides which country holds the residual claim, so the order of taxation reverses at some point in the move year. A Spanish national returning home also has a residency exit to deal with on the other side, which is a separate exercise from the ordinary return. Expect a year in which both countries treat you as taxable over overlapping periods, and in which the allocation has to be made explicitly rather than by assumption. Deal with the exit position and the change of order together, because treating them as unrelated filings is where the double charge appears.
Does the US stop taxing me once Spain taxes me?
No. Who taxes first is not the same question as who taxes at all. A US filing obligation continues while you live in Spain, and Spanish tax on the same income is relieved rather than substituted. What changes is the size of the residual charge, not its existence. This is why people on this corridor are surprised by a balance owing after paying in full in Spain: the first country tax absorbs part of the second country charge, and anything above it remains payable on that country own timetable.
What is a double tax treaty and what does it actually do?
It is an agreement between two countries that divides up the right to tax. Article by article it decides which country taxes employment income, dividends, interest, royalties, pensions, property and business profits — and where both may tax, it caps what the source country can withhold and tells the other to give credit. It also breaks residence ties and opens a government-to-government channel for disputes. What it never does is apply itself: a treaty position is claimed. See our treaty work.
What is a permanent establishment, and how easily do we create one?
A taxable presence in another country under the treaty — typically a fixed place of business such as an office, branch, factory or workshop, or a dependent agent habitually concluding contracts on your behalf. Some treaties add a services test measured in days. Purely preparatory or auxiliary activity is excluded, but that carve-out is narrower than it sounds: one senior employee working from home in the other country, with authority, has been enough. See business profits and permanent establishment.
