Autónomo in Spain for Americans: Permit, Social Security and Taxes

Setting up as an autónomo in Spain, the Spanish status of a self-employed person, is a fixed sequence for an American: first a permit that allows self-employment, then a tax registration and a Social Security registration on or before your first working day, then monthly contributions and quarterly returns. Each step belongs to a different office with its own clock, and every late step has a price. For 2026, the contribution tables are still the 2025 ones, carried over by decree until Spain passes a new budget law. This article is for informational purposes only and is not immigration, tax or legal advice; verify current requirements with the relevant Spanish authority or a licensed professional.

What does registering late cost an autónomo in Spain?

The Social Security Treasury’s practical guide to self-employment wants your registration in RETA, the special regime for self-employed workers, on the day you start working for yourself or up to 60 days before, with the tax registration by the same date. Miss that and the guide lists the bill:

• A full month. Registration takes effect from the first day of the month, so you owe the whole month’s contribution.
• No discounts. The guide says you cannot benefit from discounts on the contribution. Its own list of discounts opens with the flat rate for a first registration, but this answer does not name the flat rate, so ask Social Security before you count on it after a late registration.
• A fixed base. The late period is charged on the general table’s lowest minimum base, 950.98 euros a month in 2026, and is left out of the annual regularization.
• A fine. Depending on the seriousness, the guide warns of 3,750 to 12,000 euros. That is the range the social security infractions law sets for a late or missing registration that comes out of an inspection (articles 22.7 a and 40.1 e). When no inspection is involved, the same law puts it on the ordinary scale for serious infractions, 751 to 7,500 euros (articles 22.7 b and 40.1 b).

There is also a hard prerequisite. Social Security registers a non-EU national as self-employed only with an NIE, a Social Security number (NUSS) and a residence and work permit.

The first year’s filings, in order

One scheduling detail from the Agencia Tributaria: when a 303 deadline lands on a non-working day, Saturdays included, it moves to the next working day.

Step one: a permit that allows self-employment

Before you can send a single invoice, you need the right permit. The self-employment route is the initial temporary residence and self-employed work authorization in Hoja 14 of the Ministry of Inclusion, updated in May 2025 under Organic Law 4/2000 and Royal Decree 1155/2024. It is filed in person at the Spanish consulate for your place of residence.

Beyond the general requirements (not an EU, EEA or Swiss citizen, no criminal record in Spain or where you lived in the last 5 years, no public order threat), the ministry looks for three activity requirements: that you meet the rules Spanish law sets for nationals to open the activity, that you hold the qualification or experience it needs, with membership of the professional body (colegiación) where required, and that the planned investment is sufficient. The file holds the EX-07 form, your full passport, criminal record certificates for the last 5 years, the licenses, or a declaración responsable (a signed statement that you meet the conditions) for retail and similar services in premises up to 750 square meters, proof of qualification, homologated for a regulated profession, and proof of the investment. The hoja sets no minimum investment and never mentions a business plan. A viability report from ATA, UPTA, CIAE, OPA or UATAE is one accepted proof of qualification and investment. Foreign documents need a sworn translation and legalization or an apostille.

The government fees are due within 10 working days of filing: 10.94 euros on form 790 code 052, heading 2.1.3, and 203.84 euros on form 790 code 062. Hoja 14 calls it heading 3.3.1, while the live form on the Sede Electrónica de las Administraciones Públicas numbers it 3.1; pay the line for the work authorization of an initial self-employed residence permit.

Once approved, you have 1 month to apply for the visa, with a passport valid for 1 year, a criminal record certificate and a medical certificate; the table above covers the clocks after that. The catch is scope: the first authorization lasts 1 year and is limited to one autonomous community, as Spain’s regions are called, and one sector. A project assessed by ENISA goes down the entrepreneur visa route instead.

The telework route for freelancers with foreign clients

Freelancers whose clients are mostly abroad have another option. Under article 74 bis.1 of Law 14/2013, a self-employed international teleworker may work for companies located in Spain as long as that work stays within 20 percent of total professional activity; an employed teleworker may only work for companies outside Spain.

Step two: the tax and Social Security registrations

With the permit in hand, two registrations put you in business. The census declaration (declaración censal) on Modelo 036 is how the Agencia Tributaria learns you are starting; its 2026 taxpayer calendar wants it before you start, and any change or deregistration within 1 month. Modelo 037 is gone, abolished by Order HAC/1526/2024 from February 3, 2025. The Social Security guide still names both forms, so go with the tax agency and file the 036. One cost you can skip: as an individual, resident or not, you are exempt from the IAE, the tax on economic activities.

The RETA registration runs through Import@ss, the Social Security Treasury’s portal, no more than 60 days before you start. You estimate your annual net income, choose a contribution base and your benefits, pick the mutua colaboradora (the collaborating insurer) and enter IAE and CNAE activity codes. Have your NIE and your Social Security number on hand.

What Social Security costs in 2026

Contributions follow your real net income. The Import@ss guide starts from your net income as the income tax rules compute it, adds back the Social Security contributions you paid, then takes off a further 7 percent for generic expenses (3 percent for company partners under article 305.2.b or e). The monthly result puts you in a bracket (tramo) with a minimum and a maximum base, and you pick your base inside it.

Royal Decree-law 3/2026, validated by Congress on February 26, 2026, carries the 2025 tables of Royal Decree-law 13/2022 into 2026 until a new budget law passes, with the top brackets capped at the 5,101.20 euro ceiling; Order PJC/297/2026 of March 30 publishes them. Some sample rows:

Company owners play by a different rule. A partner who controls a capital company and is in RETA for it (article 305.2.b of the General Social Security Law; control is presumed from a one-third stake, or one-quarter for an administrator) faces a higher floor. Under article 308.1.a, rule 4.ª, the definitive base cannot be below the general regime’s group 7 minimum, 1,424.40 euros a month in 2026 under Order PJC/297/2026, which for 2026 lets the partner keep the provisional base of 2025 (Import@ss: 1,000 euros or more) until the annual regularization. Setting up the company itself is covered in the guide to setting up a Spanish SL.

Now the rate. On Social Security’s contribution base page and in the Order, the 2026 rates are 28.30 percent for common contingencies, 1.30 percent for occupational contingencies, 0.9 percent for cessation of activity, 0.1 percent for vocational training and 0.90 percent for the intergenerational equity mechanism (MEI). Our sum of these published rates is 31.50 percent, while the Import@ss guide still says 31.40. Budget on 31.50 percent: on the 950.98 euro base, that comes to about 299.56 euros a month, by our arithmetic.

Your base is not locked in. You can change it up to six times a year, effective March 1, May 1, July 1, September 1, November 1 and January 1, for requests made in the two preceding months. Every base is provisional anyway: the following year, the Treasury regularizes it against the net income the tax administration reports, which assumes you file your income tax return; if you do not, or declare no income, the definitive base is the group 7 minimum. Overpay and the money comes back without interest before April 30; underpay and the balance is due by the last day of the month after the notice, with a 10 or 20 percent surcharge after that. Only autónomos registered on December 31, 2022 on a base above their income, and who have not changed it since, may keep a base higher than their income calls for; a newcomer gets the difference refunded.

The 80 euro flat rate and its 2026 question

The upside for a newcomer is the tarifa plana (flat rate). The Import@ss guide offers a first registration 80 euros a month for 12 months, 88.64 euros with the MEI in the guide’s figures (80 euros plus 0.9 percent of the 950.98 euro base would give 88.56). Another 12 months are available if your annual net income stays below the annual minimum wage, 17,094 euros in 2026 under Royal Decree 126/2026. Social Security’s RETA page says to request the flat rate when you register, and the extension before the second 12 months begin, with a statement that your expected net income will stay below that wage. People with a disability of 33 percent or more and victims of gender violence or terrorism get 24 months, extendable by 36 on the same income condition. The exclusions: anyone registered in RETA in the previous 2 years, or 3 years after an earlier flat rate, and, per Social Security’s RETA page, relatives of self-employed workers up to the second degree and members of Catholic Church institutes of consecrated life.

The catch is the legal amount. Royal Decree-law 13/2022 set 80 euros for 2023 to 2025 and left later years to each budget law. Social Security’s RETA pages give no figure or stop at 2025, Royal Decree-law 3/2026 and the 2026 Order are silent, and no 2026 budget law setting the amount appears in the texts read for this guide. Only the Import@ss guide states 80 euros, with no year. Plan on 80 euros, the Treasury’s own figure, and check it on the Import@ss screen when you register.

Quarterly taxes, withholding and invoices

VAT. VAT runs on a quarterly rhythm for most autónomos. Modelo 303 is quarterly unless you are a large company or opt into monthly filing, and the annual summary, Modelo 390, is due within the first 30 calendar days of January (not for SII taxpayers or those with only exempt transactions). Direct debit closes the 303 window on the 15th (January 25).

Income tax payments. Modelo 130 works like a running tab: 20 percent of your net income from the start of the year to the end of the quarter, minus the payments due for the year’s earlier quarters, filed in the same windows, according to the Agencia Tributaria’s guide to economic activities. A quarter with nothing to pay still needs a nil return. Professionals skip it when at least 70 percent of the previous year’s income from the activity carried withholding; in the first year, the test uses the period the payment covers.

Withholding. Spanish business clients withhold income tax from professional income at 15 percent in general, or 7 percent in your start year and the two following; article 95.1 also sets 7 percent for some listed activities with receipts under 15,000 euros, above 75 percent of your activity and employment income. The Agencia Tributaria’s 2026 withholding table, in its version since September 10, keeps both rates. To get the 7 percent, you need no professional activity in the prior year and a signed notice to each payer, under article 95.1 of the income tax regulation, Royal Decree 439/2007.

Invoicing software. The VeriFactu rules on certified invoicing software cover individuals taxed on business income and domiciled in Spain’s common tax territory, which leaves out residents of the Basque Country and Navarre. Royal Decree-law 15/2025 moved the start to January 1, 2027 for corporate tax payers and July 1, 2027 for everyone else, the self-employed included. The official pages read do not say whether invoicing without software is covered.

The U.S. side sits outside this guide. The totalization agreement guide explains which country’s social security covers a self-employed American living in Spain, and the streamlined procedure guide covers catching up on U.S. returns.

Your next move: the permit, then one start date for both registrations

First the permit: the telework permit if your clients are mostly abroad and Spanish ones stay within 20 percent, Hoja 14 otherwise, or a Spanish employment contract if you would rather be hired. Then, after entry, a start date inside the 3 months, with Modelo 036 and the RETA registration filed on or before it, since registration within 3 months of entry makes the authorization effective (without it, you must leave Spain), and the four quarterly windows in your calendar. If your clients are in the U.S., freelancing from Spain for U.S. clients covers VAT, taxes and the U.S. forms.

With a simple activity and online access to the Agencia Tributaria and Import@ss, the registrations and the quarterly returns are a do-it-yourself job. Bring in a gestor, an administrative agent, or a tax adviser if the Hoja 14 file needs a viability report, a regulated profession needs homologation, most clients are abroad and each invoice’s VAT treatment needs checking, or the flat rate is in doubt.

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