Self-Employed Workers Who Did Not File Their 2023 Tax Return: Social Security Applies a €1,000 Minimum Contribution Base

Introduction

Since 2023, all self-employed workers have been required to report their annual Personal Income Tax (IRPF) income under the new contribution system based on actual earnings (Royal Decree-Law 13/2022). However, more than 324,000 self-employed workers did not file their 2023 income tax return. As a result, Social Security has automatically applied a minimum contribution base of €1,000 per month, pursuant to Order PCM/74/2023.

1. Why is a minimum base of €1,000 imposed?

The €1,000 base is automatically applied to self-employed workers for whom Social Security has no tax information about their actual earnings. This particularly affects:

• Collaborating self-employed workers.

• Self-employed company directors who do not receive a salary.

• Professionals who failed to file an income tax return by mistake or because they did not know they had to.

The aim is to guarantee a minimum level of contributions that supports the system and access to future benefits.

2. Immediate financial consequences

The recalculation of contributions involves:

• Retroactive application of the €1,000 base throughout 2023.

• Payment of the difference between the amount due and the contributions actually paid.

• Monthly contributions set at around €294.

The accumulated debt may amount to several hundred or even several thousand euros, particularly if late-payment surcharges are applied.

3. Tax penalties for failing to file an income tax return

The Tax Agency may impose:

• Surcharges of between 50% and 150% if the return showed tax payable.

• Fines of between €150 and €200 if the return showed a refund.

In addition, failure to file means losing the right to claim tax deductions and reductions for deductible expenses, making the subsequent correction even more costly.

4. Changes from 2026: an even greater risk

The €1,000 base is temporary and is expected to cease to apply in 2026. Unless the rules are changed, the minimum contribution base for Group 7 of the General Social Security Scheme will apply (€1,381.20 in 2025), resulting in a contribution of close to €433 per month. This makes it even more important to meet annual tax filing obligations.

5. Recommendations and next steps

• Check your notifications through Import@ss and the DEHú electronic notification service.

• If you did not file your 2023 income tax return, do so as soon as possible. The Tax Agency allows taxpayers to correct their position with reduced surcharges when they file voluntarily.

• Check whether you are exempt (for example, if you receive only pensions) and keep proper documentation of your circumstances.

• Review each year whether your contribution base matches your actual income.

6. Further views and analysis

Organisations such as ATA and UPTA have warned that many self-employed workers were not adequately informed of the requirement to file an income tax return, particularly those who work through companies. Some tax-law experts argue that the measure breaches the principle of proportionality because a standard base is imposed without regard to actual income.

From a technical standpoint, however, Social Security is acting in accordance with the rules in force, and the courts have upheld its power to adjust contribution bases ex officio when tax data is unavailable.

7. Conclusion

Automated data matching between the Tax Agency and Social Security has ushered in a new era of compliance monitoring for the self-employed. Filing an income tax return is no longer just a tax obligation; it is also a direct condition for ensuring that your Social Security contributions are correct. Failing to do so can be very costly: imposed contributions, penalties, interest and loss of entitlements.

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