Multi-activity: Social Security refunds 50% of the excess contributions to the self-employed who also contribute as employees

Self-employed workers who contribute simultaneously to the Special Regime for Self-Employed Workers (RETA) and to another Social Security regime —for example, because they combine their business with employment— are entitled to have the Treasury refund 50% of the excess common contingencies contributions paid above 17,323.68 euros, capped at 50% of what was paid into RETA alone. The reminder comes these days from the economic press, which also stresses that Social Security has a maximum period of four months to make the payment, as reported by elEconomista on 4 November.

Social Security defines multi-activity on its website as "the situation of the self-employed and/or employed worker whose activities give rise to their mandatory registration in two or more different Regimes of the Social Security System". The most common situation is that of the self-employed person who is also registered in the General Regime: the lawyer who practises independently while maintaining an employment relationship, the adviser who combines their own firm with contracted teaching, or the healthcare professional with a private practice and a public post. In all these cases, the worker contributes twice for the same contingencies, and it is that double contribution that the rule partially corrects with the refund.

What the refund consists of

The mechanics, as described in the published information, are as follows:

• Basis of the refund: the excess of common contingencies contributions above 17,323.68 euros. To calculate it, Social Security adds the contributions from work as self-employed and "the employer contributions and those corresponding to the workers in the Social Security regime applicable to their employed activity".
• Percentage: 50% of that excess is refunded.
• Cap: the refund cannot exceed 50% of the contributions the self-employed person paid for common contingencies through their RETA registration.
• Payment deadline: the General Social Security Act, in its Article 313, establishes that "the corresponding reimbursement in each case shall be paid within a maximum period of four months from the regularisation" at the end of the year.

The four-month deadline has an exception provided for in the LGSS itself: when "there are special features in the contribution that prevent it from being made within that period or the provision of data by the interested party is required". The refund is therefore linked to the annual regularisation of contributions, but practice advises against taking the automatic nature for granted: it is advisable to check each year that the refund arrives and that the amount is correct.

The origin: an over-contribution recognised by the Supreme Court

The right to the refund was born from Supreme Court case law, which recognised the right of workers in multi-activity —those contributing simultaneously to the General Regime as employees and to RETA as self-employed— to recover 50% of the excess paid when the sum of common contingencies contributions in both regimes exceeds the annual cap fixed each year by the Contribution Order. The General Treasury of Social Security adopted that doctrine and articulated an automatic refund channel, with no prior application needed, which is usually executed during the first quarter of the year in respect of the previous year's contributions. The cap changes every year, so the concrete right depends on the bases and contributions actually paid in each year.

What multi-active workers and their advisers should review

For the self-employed lawyer in multi-activity —and for the firm handling their tax and contribution affairs— the annual checking exercise has four steps:

1. Accumulate the bases and contributions of both regimes. Add up what was contributed for common contingencies in the employed regime —employer and worker contributions— and in RETA over the full year. 2. Check the cap. With the current reference of 17,323.68 euros, if the sum does not exceed it there is no excess to refund. 3. Verify the refund after regularisation. Article 313 of the LGSS fixes the reimbursement at a maximum of four months from the end-of-year regularisation; if it does not arrive, it can be demanded. 4. Review the calculation. 50% of the excess, capped at 50% of what was paid into RETA: an error in either term reduces the refund.

The refund concerns common contingencies contributions. Separate from it is another advantage that the published information attributes to multi-activity: the possibility of waiving the temporary incapacity contribution in RETA if that cover is maintained in the General Regime, with the trade-off of losing the benefit for sick leave arising from self-employed work.

The cost of multi-activity in 2026

Multi-activity remains an economically costly decision for many professionals: contributing in two regimes raises the monthly outlay, and the 50% refund of the excess only compensates part of it. For those considering the leap to full-time independent activity —or the other way around, combining— the annual calculation of double contribution is an essential piece of planning, together with the choice of contribution base by net income under RETA's progressive contribution system.

In the case of the lawyer who practises as self-employed while maintaining an employment relationship —for example, as a teacher or in-house adviser— multi-activity also has implications for the documentary and registry organisation of their activity and for how they invoice and declare, a terrain where the arrival of Verifactu and the duplication of tax authority notifications already add enough complexity to neglect contributions on top.

What to do if the refund does not arrive

When the automatic refund is not made despite the requirements being met, the multi-active worker can request it from the Treasury, providing evidence of contributions in both regimes. The route is administrative, and silence or denial open the way to the prior claim and, where appropriate, to the social jurisdiction. It is advisable to keep RETA contribution receipts, payslips showing General Regime contributions and the employment history record, which are the evidence on which any claim is built. The limitation period for refunds of undue payments to Social Security is one more argument for not postponing the year-by-year review.

An annual check that should not be postponed

The multi-activity refund is one of those rights that are lost from sight precisely because their processing is automatic: nobody receives a notification reminding them that they may have an excess contribution in their favour. The practical advice for members and advisers is to build the check into the firm's annual calendar and verify the amount against the real contributions of both regimes and the current cap reference. And to follow the evolution of any collection incidents that may arise along the way, the sector has had, since 11 November, a new CASIA query channel on enforcement debts.

Frequently asked questions

Who is entitled to the multi-activity refund?

Workers who contribute simultaneously to RETA and to another Social Security regime whose combined common contingencies contributions exceed the annual cap.

How much is refunded?

50% of the excess common contingencies contributions above 17,323.68 euros, capped at 50% of what was paid into RETA for that concept.

Which contributions are added to calculate the excess?

Those from work as self-employed and the employer and worker contributions in the employed regime.

Within what period is it paid?

Article 313 of the LGSS fixes a maximum of four months from the end-of-year regularisation, except for special contribution features or the need for data from the interested party.

What other advantage does multi-activity have?

It allows waiving the temporary incapacity contribution in RETA if it is maintained in the General Regime, losing the benefit for sick leave arising from one's own activity.

Sources

• elEconomista: "La Seguridad Social devolverá el 50% de las cuotas por contingencias comunes a los autónomos en pluriactividad" (4-11-2026)
• Social Security: worker contributions and collection (electronic office)