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

Working as an autónomo in Spain, the Spanish status of a self-employed person, runs in a fixed order for an American: a permit that allows self-employment, then a tax registration and a Social Security registration on or before the first day of work, then monthly contributions and quarterly returns. Each step answers to a different office with its own clock, and a late step costs money. 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 asks for 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, and for the tax registration by the same date. Register late and the guide lists the cost:

• A full month. The registration takes effect from the first day of the month, so the whole month’s contribution is due.
• No discounts. You lose the reductions on the contribution, the flat rate described below included.
• A fixed base. The late period is charged on the general table’s lowest minimum base, 950.98 euros a month in 2026, and stays out of the annual regularization.
• A fine. The guide warns of 3,750 to 12,000 euros, depending on the seriousness.

Social Security also registers a non-EU national as self-employed only with an NIE, a Social Security number (NUSS) and a residence and work permit, so the permit comes first.

The first year’s filings, in order

A 303 deadline that falls on a non-working day, Saturdays included, moves to the next working day, the Agencia Tributaria says.

Step one: a permit that allows self-employment

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. You file it in person at the Spanish consulate for your place of residence.

You must meet the rules Spanish law sets for nationals to open the activity, hold the qualification or experience it needs, with membership of the professional body (colegiación) where required, and show 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), proof of qualification, homologated for a regulated profession, and proof of the investment. The hoja sets no minimum investment and never says 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.

Fees are paid 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 the second heading 3.3.1, but 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.

After approval, you apply for the visa within 1 month, with a passport that has 1 year of validity, a criminal record certificate and a medical certificate; the clocks that follow are in the table. 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 takes the entrepreneur visa route instead.

The telework route for freelancers with foreign clients

Article 74 bis.1 of Law 14/2013 lets a self-employed international teleworker work for companies located in Spain as long as that work is no more than 20 percent of total professional activity; an employed teleworker may only work for companies outside Spain. That permit is covered in the digital nomad visa guide.

Step two: the tax and Social Security registrations

The census declaration (declaración censal) on Modelo 036 tells the Agencia Tributaria you are starting; its 2026 taxpayer calendar wants it before you start, and any change or deregistration within 1 month. Order HAC/1526/2024 abolished Modelo 037 from February 3, 2025. The Social Security guide still names both, so follow the tax agency and file the 036. As an individual, resident or not, you are exempt from the IAE, the tax on economic activities.

The RETA registration goes 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 benefits, pick the mutua colaboradora (the collaborating insurer that will cover your risks) and give IAE and CNAE activity codes. Have your NIE, covered in the NIE guide, and your Social Security number ready.

What Social Security costs in 2026

Contributions follow real net income. The Import@ss guide takes your income minus deductible expenses, then a further 7 percent for generic expenses; the monthly result places you in a bracket (tramo) with a minimum and a maximum base, and you choose your base inside it.

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

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; the Import@ss guide still says 31.40. Plan on 31.50 percent: on the 950.98 euro base, that is about 299.56 euros a month, by our arithmetic.

You can change the base 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. The bases stay provisional: the following year, the Treasury regularizes them with the net income the tax administration reports. An overpayment comes back without interest before April 30; an underpayment is due by the last day of the month after the notice, then carries a 10 or 20 percent surcharge. Only autónomos already registered on December 31, 2022 may keep a base higher than their income calls for; for a newcomer, the difference is refunded.

The 80 euro flat rate and its 2026 question

The Import@ss guide offers a first registration a tarifa plana (flat rate) of 80 euros a month for 12 months, 88.64 euros with the MEI in the guide’s figures (0.9 percent of the 950.98 euro base would give 88.56). Another 12 months are possible 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 ask for the flat rate when you register and for 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. Anyone registered in RETA in the previous 2 years is excluded, or 3 years after an earlier flat rate, and Social Security’s RETA page also excludes relatives of self-employed workers up to the second degree and members of Catholic Church institutes of consecrated life.

The legal amount is the open question. Royal Decree-law 13/2022 set 80 euros for 2023 to 2025 and handed later years to each budget law. Social Security’s RETA page repeats that, with no figure; its page on the new contribution system still says 2023 to 2025; Royal Decree-law 3/2026 and the 2026 Order are silent, and no 2026 budget law setting the amount appears in the official texts read for this guide. Only the Import@ss guide states 80 euros with no year attached. Plan on 80 euros, the Treasury’s own figure, and confirm it on the Import@ss screen when you register.

Quarterly taxes, withholding and invoices

VAT. Under the general regime, the VAT return, Modelo 303, is quarterly, and the annual summary, Modelo 390, is due in the first 30 calendar days of January. The pages cited here do not cover the rate on each invoice or invoices to clients abroad.

Income tax payments. Modelo 130 is 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, in the same windows, the Agencia Tributaria’s guide to economic activities says. A quarter with nothing to pay still needs a nil return. Professionals are exempt 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. On professional income, a Spanish business client withholds income tax at 15 percent, or 7 percent in your start year and the two following. The Agencia Tributaria’s 2026 withholding table, in its version since September 10, keeps both rates. The 7 percent requires 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 their 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 is 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

Choose the permit first: 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. After entry, set a start date inside the 3 months, file Modelo 036 and the RETA registration on or before it, and put the four quarterly windows in your calendar.

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

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