Doctrine by topic · DGT Observatory

Joint Tax Return: DGT doctrinal evolution

How the DGT's position on this topic has evolved, and the rulings it rests on.

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How the DGT's position has evolved

Settled doctrine High confidence 31 rulings · 2014–2026

Current position

The family unit for the joint tax return is composed of spouses who are not legally separated and their minor children. In cases of separation, only one parent can form a family unit with the children, while the other must file individually. The right to the personal allowance for descendants belongs to the parent who holds custody at the accrual date, and it is incompatible with the regime of child support annuities.

The DGT's position remains constant regarding the definition of the family unit and the exclusion of double units in cases of separation. The doctrine has specified the application of allowances and deductions, clarifying that the right to the personal allowance for descendants is linked to custody and not to the mere provision of child support. No doctrinal shifts are observed, but rather a delimitation of rights in situations of separation and disability.

Turning points

  1. V3680-15

    Establishes that in cases of separation only one parent can form a family unit with the children, preventing both from filing jointly with them.

  2. V1326-26

    Determines the incompatibility between the personal allowance for descendants and child support annuities, assigning the right to the parent with custody.

Analysis based on 30 of 31 rulings with a stated position. Updated 24 September 2026.

Rulings on this topic

24
V1100-25 25 Jun 2025

Minimum for ancestors applicable if mother's income is below 8,000 euros

SG de Impuestos sobre la Renta de las Personas Físicas
mínimo por ascendientesrentas anualesdeclaración conjuntaconvivenciaperíodo impositivo LIRPF — Ley 35/2006 del IRPF art. 59LIRPF — Ley 35/2006 del IRPF art. 61
Affects CompanyExpat · Non-residentIndividual
V0368-25 20 Mar 2025

Co-habiting couples cannot file joint tax returns

SG de Impuestos sobre la Renta de las Personas Físicas
unidad familiardeclaración conjuntapareja de hechovínculo matrimonialdeclaración individual LIRPF — Ley 35/2006 del IRPF art. 82.1LIRPF — Ley 35/2006 del IRPF art. 84.2.4º
Affects CompanyExpat · Non-residentIndividual
V1555-24 25 Jun 2024

The €1,800 limit for the descendant minimum is applied to net income

SG de Impuestos sobre la Renta de las Personas Físicas
mínimo por descendientesrendimientos del trabajorendimientos de capital mobiliariorendimiento netorentas anuales LIRPF — Ley 35/2006 del IRPF art. 18LIRPF — Ley 35/2006 del IRPF art. 19
Affects CompanyExpat · Non-residentIndividual
V1269-18 14 May 2018

Exemption on sale of primary residence applies only to taxpayers over 65

SG de Impuestos sobre la Renta de las Personas Físicas
ganancia patrimonialvivienda habitualexencióndeclaración conjuntatransmisión de vivienda LIRPF — Ley 35/2006 del IRPF art. 33.1LIRPF — Ley 35/2006 del IRPF art. 33.4.b
Affects CompanyExpat · Non-residentIndividual
V4810-16 10 Nov 2016

Ascendant tax allowances may apply if annual income is below €1,800

SG de Impuestos sobre la Renta de las Personas Físicas
mínimo por ascendientesmínimo por discapacidaddeclaración conjuntarentas anualeslímite de rentas LIRPF — Ley 35/2006 del IRPF art. 59LIRPF — Ley 35/2006 del IRPF art. 60
Affects CompanyExpat · Non-residentIndividual

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