How a spouse and children in Spain affect your tax residency

Key rules

• Family presumption: A spouse who is not legally separated and minor children living in Spain make you presumed resident unless you prove otherwise.
• Burden of proof: Once the presumption applies, you must prove tax residence in another country, with a tax-residence certificate as the main document. For the 183-day and economic-interests tests, the tax authority must show the facts.
• De facto separation: Living apart without a court judgment or formal agreement does not end the presumption.
• Partner who is not your spouse: Not named in the rule, but living in Spain can still count as evidence of ties.

If your spouse and your minor children live in Spain, Spain presumes you are a tax resident too. This is a presumption, not a final ruling. You can rebut it with proof. Until you do, the tax authority (the AEAT) will treat you as resident. The rule is the same for every nationality, because it depends on tax residence, not citizenship.

When the presumption applies

It applies when both of these are true:

• Your spouse is not legally separated from you. You are legally separated only with a court judgment or a formal separation agreement.
• Your dependent minor children, who depend on you, habitually live in Spain.

Dependent minor children means children under 18 who depend on you. Proof of the family tie is the marriage certificate for a spouse, and the birth certificate with proof of dependence and residence in Spain for children.

What about an unmarried partner?

The wording names only a spouse. An unmarried or de facto partner is not literally covered. A registered partner (pareja de hecho inscrita) is not named either, and the registration certificate of the partnership documents that tie. In both cases the AEAT can treat your partner living in Spain as evidence of ties when it looks at your whole situation. Do not assume a partner keeps you safe.

How to rebut it

The burden of proof is on you: you must prove that you are tax resident in another country. The main document is a tax-residence certificate issued by that country's tax authority, backed by your work, income and main assets there. If you are resident in both countries, a double tax treaty tie-breaker decides which country treats you as resident, and the other country's residence certificate is the usual proof.

Keep everything, because the tax authority or a court will look at the facts of your case.

If only one of you moves

Each spouse is tested on their own days and ties. If you move to Spain and your spouse and children stay abroad, the family presumption does not apply to you: your residence rests on your own days and economic interests. Your spouse stays non-resident in Spain while they spend 183 days or fewer here and keep their main economic interests abroad. Once you are both resident, whether to file jointly or separately is in Joint or individual filing for couples.

What to do

1. Check whether your spouse and children fit the description above.
2. If they do, gather the proof before you file or answer any query from the AEAT.
3. If your situation is borderline, such as a partner you are not married to or a separation, ask a Spanish tax adviser before you file.