Joint or individual filing for couples and families

Key rules

• Joint reduction: The reduction is 3,400 euros for a married couple and 2,150 euros for a single parent with children.
• Unmarried couples: Unmarried couples cannot file a joint return together.
• Liability: On a joint return, each of you can be asked to pay the full tax debt.
• Final choice: Your choice becomes final when the voluntary filing period ends.
• Spouse abroad: A spouse who is not a Spanish tax resident cannot join your joint return, apart from limited exceptions.

Who can file jointly

Only two kinds of household can file jointly, and only if they are Spanish tax residents.

• Married couple unit: you are married and not legally separated. Your children under 18 who live with you can join. So can older children who are incapacitated and under your parental authority.
• Single-parent unit: you are unmarried or legally separated, and you file with the children who live with you.

Unmarried couples (parejas de hecho) cannot file jointly as a couple. Each person can belong to only one unit.

Your family situation and your children's ages are assessed on 31 December of the tax year. If you marry or separate in January, it counts for the following year.

What you gain

Joint filing gives a reduction of 3,400 euros for a married couple and 2,150 euros for a single parent with children. It is taken off your general income first. Any leftover is taken off your savings income.

Joint filing tends to be cheaper when one spouse has little or no income. The second spouse's unused personal allowance is then not wasted.

It tends to cost more when both spouses earn similar, substantial amounts. Your combined income climbs the progressive tax scale faster. Personal allowances are not doubled. Some regional deductions also have lower limits for joint returns.

To compare, run both options in the tax agency's online filing tool before you submit. Its simulator shows the result of each.

What you take on

When you file jointly, you are each liable for the whole tax debt (solidariamente). The tax agency can pursue either of you for the full amount, not just your half. Think about this before filing jointly with a partner whose finances you do not control.

Rules that bind you

• Everyone in the unit must file the same way. If one member files individually, the others cannot file jointly as that unit.
• You can change between joint and individual filing until the voluntary filing period ends. After that, the choice is final. Check the dates in the timeline below.
• The annual campaign usually runs from early April to 30 June. Foral territories (the Basque Country and Navarra) set their own dates.

If your spouse lives abroad

A spouse who is not a Spanish tax resident cannot be part of your unit, so you file individually. There are exceptions for EU/EEA nationals who choose to be taxed as residents, and for Spanish nationals treated as residents abroad. If this may be you, ask the AEAT, Spain's tax agency, before you file.

How to decide

Use the decision, checklist and timeline below. Compare the totals for both options, then file.

Choosing between options

Should you file a joint return or individual returns?

• File jointly: One of you has little or no income, so the joint reduction applies and the second person's unused personal minimum is not lost. Everyone in the unit must be a Spanish tax resident.

• File individually: You both have similar, substantial incomes, because combined income climbs the tax scale faster, personal minimums are not doubled, and regional deductions may have lower joint limits. Also choose this if your spouse is not a Spanish tax resident.

Run both options in the Renta Web simulator and choose the lower tax. Decide before the filing period ends, because the choice is fixed afterwards.

Timeline and deadlines

• Online filing and telephone appointments open, so you can compare joint and individual filing and submit: early April

• In-person help at the tax office starts: in May or June

• File if you pay by direct debit, which has an earlier cutoff: a few days before the end of June, typically around 25 June

• Make your final choice between joint and individual filing, because it cannot be changed after the campaign closes: by the end of the campaign, 30 June

Checklist

• Check whether you form a married-couple unit: married, not legally separated, with any children under 18 (or incapacitated and under parental authority) living with you.

• Check whether you form a single-parent unit: you are unmarried or legally separated and live with your children.

• Add the joint reduction to your comparison: 3,400 euros for a married couple or 2,150 euros for a single parent. It reduces your general income first, and any excess reduces your savings income.

• Confirm whether your spouse is a Spanish tax resident; if not, plan to file individually unless an EU/EEA exception applies to you.

Frequently asked questions

Can an unmarried couple file a joint return?

No, an unmarried couple (pareja de hecho) cannot file jointly as a couple. If you are a single parent, you can file jointly with the children who live with you as a single-parent unit.

Are both partners responsible for the tax if we file jointly?

Yes, if you file jointly, you are each liable for the whole tax debt, not just your half. The tax office can pursue either of you for the full amount, so think about this before choosing a joint return.

Can I switch between joint and individual filing after I file?

You can change your choice only until the end of the voluntary filing period, and after that it is fixed. You also cannot mix modes in one year: if one partner files individually, the others cannot file jointly as that unit.

Can I file jointly if my spouse is a Spanish tax resident but I filed already as single?

No, members of the same unit cannot mix modes in the same year, so your spouse cannot file jointly as that unit once you have filed individually. Make the choice together before anyone submits.