Working as an Employee and Self-Employed in 2026

Being self-employed and an employee at the same time is legal. In Spain, it is known as pluriactividad, or multiple-regime work, and it has its own rules: you contribute under two regimes (the General Regime and RETA), Social Security automatically refunds 50% of the excess when your common-contingency contributions exceed 17,323.68 € in 2026, and for Personal Income Tax you must file a return simply because you are registered with the RETA. This guide covers registration, double contributions, the refund, taxes and benefits, using the figures in force in 2026.

What multiple-regime work is (and how it differs from multiple employment)

Multiple-regime work is the situation in which someone works under two different Social Security regimes at the same time: usually an employment contract (General Regime) alongside a self-employed activity (RETA). A typical example is working for a company and invoicing as a designer, developer, trainer or consultant in the evenings.

Do not confuse it with multiple employment, which means holding two or more employed jobs under the same regime (two salaries, two companies). The contribution and refund rules in this guide apply only to multiple-regime work.

Is it legal? Yes, and no one’s prior permission is needed in the private sector. The only constraints are:

• Your employment contract. A full-dedication or exclusivity clause (which must be compensated financially), or the duty not to compete: you cannot set up the same activity as your employer on your own account and take its clients.
• Public-sector employment. Prior authorisation is compulsory there (see the next section).

How to register without leaving your job

There is no special registration process for multiple-regime work: you complete the two normal registrations required of any self-employed person, with the detail that when registering with the RETA you state that you already work as an employee (the TGSS automatically cross-checks this against your employment record).

You do not need to tell your employer anything unless your contract requires it. That said, your self-employed registration is information that can surface (your clients’ invoice records or advertising for your activity), so resolve any contractual grey area beforehand.

How much you contribute: double contributions explained

When you work under multiple regimes, you contribute twice, under two regimes, for different items:

• In your employment, contributions continue as normal: your employer and you contribute on your salary. For common contingencies, the rate is 28.30% (23.60% paid by the employer and 4.70% by you) in 2026.
• As a self-employed person, you pay your monthly contribution according to your declared net-income band, exactly like any other self-employed person under the actual-income system. You can find the 2026 bands and contributions in our 2026 guide to self-employed contributions.

Two features work in your favour:

Optional temporary-incapacity cover (a direct saving on your contribution)

If temporary incapacity is already covered by your employment, temporary-incapacity cover under the RETA is voluntary (Art. 315 of the General Social Security Law). If you do not opt in, your self-employed contribution is reduced. It is one of the few boxes on the registration form worth considering twice: if your employment is stable and full-time, duplicating temporary-incapacity cover is rarely worthwhile.

Compatible flat rate

The reduced contribution is compatible with multiple-regime work if you meet the general requirements. Social Security currently indicates €80/month during the initial period and contemplates an extension when annual net income stays below the SMI, but you should confirm the amount, duration and requirements in Import@ss when you register: the transitional provision expressly set €80 for 2023-2025 and the subsequent amount depends on the applicable regulations. Details are in the 2026 flat-rate guide.

The automatic refund of excess contributions

Here is the key rule for multiple-regime work, and the one that almost no one applies correctly. Because you contribute twice for common contingencies, the law recognises that above a certain point you are over-contributing and refunds part of it (Art. 313 LGSS, implemented each year by the contributions order):

Example using 2026 figures

Suppose your contribution base as an employee is 3,000 €/month and, as a self-employed person, you contribute on a base of 2,500 €/month:

The cap does not apply here: 677.16 € is well below 50% of the RETA common-contingency contributions (4,245 €).

With modest salaries and contribution bases, it is normal not to reach the threshold: the refund mainly benefits those making high contributions under both regimes. That is not a flaw in the system; it is how the system is designed.

Personal Income Tax with two sources of income

This is where the most expensive confusion about multiple-regime work arises, so let us take it step by step.

You must file a return. Always.

Anyone registered with the RETA at any time during the tax year must file an income tax return, regardless of their income. The familiar employment-income limits—in force for the 2025 income tax campaign filed in 2026—only exempt people whose sole income is a salary or pension:

Withholdings and payments on account

If yours is a professional activity and you invoice companies or other self-employed people, your clients apply a 15% withholding (7% in the year you register and the following two years, in force in 2026). Those withholdings are payments on account of your Personal Income Tax.

What about form 130 (the quarterly payment on account)? Multiple-regime work often brings good news here: professionals are exempt from filing it if at least 70% of their business income was subject to withholding in the previous year (Art. 109 of the Personal Income Tax Regulation). If your clients are companies, you are very likely not required to file form 130. If you sell to individuals or carry out a business activity, you do have to file it: step-by-step guide to form 130.

Also remember the regularisation of self-employed contributions: your RETA band is determined solely from the income from your self-employed activity, and the TGSS later cross-checks it with the tax authority. If you underestimated it, you will be asked to pay the difference; if you over-contributed, it will be refunded. The full mechanism is covered in the 2026 guide to RETA bases and regularisation.

VAT, invoicing and VeriFactu

There is no special VAT treatment for multiple-regime work: your salary is outside its scope, and your activity is taxed like that of any other self-employed person. If your activity is not exempt, you charge VAT on every invoice and file quarterly form 303 (and the annual summary, form 390).

What does affect you fully, even if you issue very few invoices, is VeriFactu: the regulation requiring invoicing software to generate immutable and verifiable records. The timetable in force after RDL 15/2025 is: companies from 1 January 2027 and self-employed people from 1 July 2027. Issuing “only a few invoices a month in the evenings” does not exempt you: the requirement depends on being a business or professional, not on volume.

VeriFactu timeline (updated 6 October 2026). The rule in force, Royal Decree-law 15/2025 of 2 December, sets the adaptation deadline before 1 January 2027 for Corporate Income Tax payers and before 1 July 2027 for everyone else. On 5 October 2026 Spain’s Ministry of Finance announced it will postpone the obligation to October 2028, to align it with mandatory B2B e-invoicing. That postponement has not yet been published in the BOE (Spain’s official gazette).

For someone combining activities, time is the scarce resource: your self-employed work occupies the hours taken from everything else. That is where a tool such as Frihet fits well: the free plan includes up to 999 invoices per month, with VeriFactu covered through a responsible declaration, while the income and expense records keep your net income calculated—the exact figure you need to choose the right RETA band and avoid surprises during regularisation. As the activity grows, you can move to Pro (9 € per month) or Premium (29 € per month) without migrating systems.

Benefits: what you gain (and what you do not) by contributing twice

Temporary incapacity

If you keep temporary-incapacity cover under both regimes and go on sick leave, you can receive two benefits, one from each regime and each calculated using its own base. If you opted out of temporary-incapacity cover under the RETA (Art. 315 LGSS), you only receive the General Regime benefit—in exchange for the lower contribution you have been paying.

Unemployment and cessation of activity

You contribute for unemployment through your job and for cessation of activity through the RETA, but receiving unemployment benefit while remaining registered as self-employed is not the default: as a general rule, unemployment benefit is incompatible with self-employment, subject to specific cases of temporary compatibility. If you are dismissed and want to preserve your benefit, the decision about your self-employed registration must be taken with the SEPE rules in front of you, not based on a forum post.

Retirement: the possibility of two pensions

This is the most powerful effect of sustained multiple-regime work: if you maintain overlapping contributions under both regimes for years and meet the eligibility requirements (age and qualifying period) under each regime separately, you can become entitled to two retirement pensions, one from each regime. If you do not reach the qualifying period under one of them, those contributions are not lost: they are taken into account to improve the basis of the pension under the other. Simultaneous contributions are not counted twice for one pension, but they do build separate rights.

Common mistakes when combining employment and self-employment

• Applying for the refund of excess contributions by filling in forms: under the actual-income system, it is automatic; you only need to keep your bank details current.
• Not filing an income tax return because “I earn less than 22,000 €”: that threshold does not apply while you are registered with the RETA.
• Duplicating temporary-incapacity cover without making a decision: it is optional under the RETA if it is already covered through your employment, and ticking the box by inertia costs money every month.
• Choosing your RETA band by including your salary: the band is based only on net income from your self-employed activity.
• Ignoring your contract: an agreed exclusivity or non-compete clause can cost you your job, which is usually the greater source of income.
• Registering as self-employed while a public employee without recognised compatibility: Law 53/1984 leaves no grey area.
• Thinking VeriFactu is only for large companies: as a self-employed person, it applies to you from 1 July 2027, whether you issue 3 or 300 invoices per month.

Well-managed multiple-regime work is one of the most efficient situations there is: diversified income, contributions that are automatically refunded once you exceed the threshold and, in the long term, potentially two pensions. What it does not forgive is disorganisation—and that, unlike the contribution, depends entirely on you.