Working from Spain without telling your employer: what can go wrong

Terms used

• Beckham — The Beckham law is Spain's special tax regime for some newcomers who move to Spain for work.
• IRPF — The IRPF is Spain's annual personal income tax, which residents pay on their worldwide income.
• NIE — The NIE is the identification number Spain gives to foreigners.
• Beckham regime — The Beckham regime is a special Spanish tax regime for workers who move to Spain.
• A1 certificate — The A1 certificate shows you stay in your home country's social security system while working in another EU country.
• Declaración complementaria — A declaración complementaria is an amended tax return that corrects or adds to one already filed.
• Modelo 720 — Modelo 720 is the declaration of assets held abroad, required above 50,000 euros.
• Modelo 030 — Modelo 030 is the form used to register or update your tax details with the tax agency.

Key rules

• Tax residence: More than 183 days in Spain in a year makes you Spanish tax resident, whatever your employer knows.
• Voluntary late filing: Filing before the tax agency contacts you means surcharges, not penalties.
• Employer exposure: Your employer can face social security arrears, withholding duties and fines, not only you.
• Non-EU workers: You cannot work lawfully in Spain on a tourist stay.
• Beckham regime: The application window is six months.

The short answer

Keeping quiet does not cancel your duties in Spain. It adds penalties and risk for you and for your employer. The good news: you can regularise, and the earlier you do, the cheaper it is.

What can go wrong for you

Tax. If you spend more than 183 days in Spain in a year, or your main economic interests are here, you are Spanish tax resident. You must file the annual IRPF return on your worldwide income. Staying silent with your employer does not change that.

Social security. You are normally covered in the country where you physically work. That means registering in Spain, or holding an A1 certificate if you are an EU case and your employer keeps you in the home system. If neither is in place, contributions go unpaid and surcharges build up.

Your job. Hiding where you work is likely a breach of your contract. It can lead to disciplinary dismissal.

Immigration. If you are not an EU citizen, you need residence and work permission, such as the digital nomad visa. You cannot work lawfully on a tourist stay. Penalties include fines and refusal of later permits.

What can go wrong for your employer

A foreign employer with no Spanish entity can still be required to register with Spanish Social Security and pay contributions, plus surcharges and interest on arrears. Failing to register a worker is treated as a serious or very serious labour infringement, with fines in the thousands of euros per worker.

The employer may also have to withhold IRPF on your pay once you are Spanish tax resident. Your home office can even create a permanent establishment if you habitually conclude contracts or the home is at the company's disposal. That would bring Spanish corporate tax.

What unpaid tax costs

• File late on your own, before the tax agency contacts you: a surcharge of 1% plus 1% for each full month of delay, up to 12 months. Surcharges of 1% to 14% carry no penalty and no interest. Paying the amount and surcharge on time cuts the surcharge by 25%.
• After 12 months: the surcharge is 15% and late-payment interest runs from the 13th month.
• If the tax agency finds it first: you pay interest plus penalties of 50% of the unpaid amount for a minor infringement, 50% to 100% for a serious one, and 100% to 150% where there is concealment or fraud. Penalties fall by 30% if you agree and 25% for prompt payment.
• Tax fraud over 120,000 euros a year is a crime.

How to regularise

Do it in this order.

1. Tell your employer and agree how the work will be documented: a formal remote-work arrangement, a local contract through an employer of record, or a Spanish entity.
2. Confirm your right to live and work. EU citizens register and get a NIE. Non-EU workers need a suitable permit.
3. Register with Social Security if you have no number, and have your employer register in Spain or get an A1 certificate.
4. File the missed IRPF returns late, or an amended return (declaración complementaria). Do this before the tax agency contacts you, so you pay surcharges rather than penalties.
5. Register as tax resident, using Modelo 030 or 037 where needed.
6. Check whether you must file Modelo 720 for foreign assets above 50,000 euros.

If you are considering the Beckham regime, you must apply within six months, so do not leave it. A tax adviser (asesor fiscal or gestor) can confirm the right route for your case. The checklist, documents and timeline below follow these steps.

Timeline and deadlines

• Becoming Spanish tax resident and having to file IRPF on worldwide income: once you spend more than 183 days in Spain in a calendar year

• Apply for the Beckham regime (special tax regime for inbound workers): within six months

• File missed IRPF returns late before the tax agency contacts you: 1% plus 1% per full month of delay: in the first 12 months of delay

• Surcharge rises to 15% and late-payment interest starts: after 12 months of delay

Documents you need

• NIE (foreigner's identification number), if you are an EU citizen: register in Spain to get it.

• Residence and work permit, if you are not an EU citizen, such as the digital nomad visa. You cannot work lawfully in Spain on a tourist stay.

• Social Security number, issued by Spanish Social Security, if you do not have one yet.

• A1 certificate, issued in the home country, if your employer keeps you in its home social security system in an EU case.

• A written remote-work arrangement, a local contract through an employer of record, or a contract with a Spanish entity, agreed with your employer.

• Late IRPF returns for the missed years, or an amended return (declaración complementaria), filed with the tax agency.

Checklist

• Choose between a formal remote-work arrangement, a local contract through an employer of record, or a Spanish entity.

• Register with Spanish Social Security and get a number if you do not have one.

• Ask your employer to register in Spain or to obtain an A1 certificate to keep your home coverage.

What to watch out for

• Dismissal for hiding your location: Working from another country without telling your employer is likely a breach of your contract and can lead to disciplinary dismissal. Tell your employer and get the arrangement agreed in writing before problems start.

• Working without permission: If you are not an EU citizen, you cannot work lawfully in Spain on a tourist stay. Fines and refusal of later permits can follow. Get a suitable residence and work permit, such as the digital nomad visa.

• Unpaid social security: Without registration in Spain or an A1 certificate, contributions go unpaid and surcharges and interest build up for you or your employer. Register with Spanish Social Security, and ask your employer to register or get an A1 certificate.

• Exposure for your employer: A foreign employer can face withholding duties, Spanish corporate tax if your home office creates a taxable presence, and fines of thousands of euros per worker. Tell your employer early so it can choose an employer of record or a Spanish entity.

• Penalties on unpaid income tax: If the tax agency finds unpaid IRPF before you do, penalties start at 50% of the unpaid amount and reach 150% where there is concealment or fraud. File late returns yourself before the agency contacts you, so you pay only a surcharge.

Frequently asked questions

Can I fix things before the tax agency contacts me?

Yes, if you file your missed IRPF returns late before the tax agency (AEAT) contacts you, you pay a surcharge instead of a penalty. The surcharge is 1% plus 1% for each full month of delay, up to 12 months. After 12 months it becomes 15% and late-payment interest also starts.

What if the tax agency finds the unpaid tax first?

If the AEAT finds the debt first, you pay interest on arrears plus a penalty of 50% of the unpaid amount for a minor infringement. Serious cases cost 50% to 100%, and very serious cases involving concealment or fraud cost 100% to 150%. Tax fraud over 120,000 euros per year is a crime.

Can I get a lower penalty if I pay quickly?

Yes, paying promptly cuts a penalty by 25%, and agreeing to the assessment cuts it by a further 30%. If you file late on your own, the surcharge is also reduced by 25% when you pay the tax and surcharge on time.

Can my employer be fined if I work in Spain without telling them?

Yes, a foreign employer with no Spanish entity can be fined if it fails to register you with Spanish Social Security or pay contributions. Fines can run to thousands of euros per worker, plus surcharges and interest on arrears. Your home office can also create a taxable presence for the company in Spain.