Spain’s 2026 income tax campaign highlights one of the most valuable — and often misunderstood — tax benefits: the minimum for descendants.

Parents can reduce their taxable income by up to €4,500 per child, depending on their family situation.

This is not a direct tax credit — the actual saving depends on your marginal tax rate — but when applied correctly, it can still translate into a significant reduction in your final tax bill.

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Under current rules, parents may reduce their taxable base by up to €4,500 per child, depending on family circumstances. This is not a direct deduction, but a reduction in the income subject to tax — which can significantly lower the final tax bill.  

Key requirements

To apply this benefit, several conditions must be met:

• The child must be under 25 years old
• The child must live with the parents (or be financially dependent)
• The child must not earn more than €8,000 per year
• In shared custody cases, the benefit is split between both parents  

How much can you reduce?

The tax reduction increases with the number of children:

• €2,400 for the first child
• €2,700 for the second
• €4,000 for the third
• Up to €4,500 for the fourth and subsequent children  

Additional increases may apply for children under 3 or in specific family situations.

Why this matters

Many taxpayers assume this is a fixed “refund,” but in reality:

• It reduces your taxable income, not your tax directly
• The actual saving depends on your marginal tax rate
• It can be combined with other benefits (maternity, large family, childcare, etc.)  

In practice, properly applying all available family-related tax benefits can result in thousands of euros in savings.

Common mistakes we see

At LIMIT, we regularly identify issues such as:

• Children incorrectly excluded due to misunderstanding income thresholds
• Failure to split the benefit correctly in shared custody
• Missing complementary deductions at regional level
• Incorrect classification of dependent children studying abroad

Final takeaway

If you have children in Spain — especially in international or digital setups — your tax position is likely more complex than it seems.

This is one of those areas where a proper review can materially change your tax outcome.