Obligations for Self-Employed Workers in Spain: Taxes and Fiscal Responsibilities in 2026

Being self-employed in Spain comes with a list of tax obligations that, handled well, are nothing to fear, and handled badly, cost you penalties. We are talking about registering correctly, filing your quarterly income tax and VAT returns, paying your Social Security contribution, and taking advantage of the deductions you are entitled to. Knowing them is what separates someone who works with peace of mind from someone who lives on edge over the tax office.

This guide covers everything you need to know, with the current figures: registration, the taxes you pay, the quarterly returns with their forms, the self-employed contribution and the flat rate, and the expenses you can deduct to pay less, legally.

Registering as self-employed and tax registration

Before issuing your first invoice you have to be registered in two places: the Tax Agency and Social Security. They are separate procedures and both are mandatory.

Registering with the Tax Agency (form 036 or 037)

You formalize your tax status with the census declaration, using form 036 or its simplified version, form 037. There you declare your details, the activity you will carry out, the IAE code that describes it, and the VAT and income tax regime that applies to you. Choosing the right code matters: it defines your obligations and your deductions. Most self-employed workers are exempt from paying the IAE as long as they invoice less than one million euros a year, but it still has to be declared.

Registering with Social Security (RETA)

You register with the Special Regime for Self-Employed Workers before starting the activity, through the Social Security’s Import@ss portal. This is what gives you healthcare, temporary disability, and retirement coverage. In this same procedure you decide whether to apply for the flat rate, and it is best not to forget it, because it cannot be requested retroactively afterward.

Taxes a self-employed worker pays

The two taxes that shape your day to day are income tax (IRPF) and VAT, both managed quarterly. On top of these comes your monthly Social Security contribution.

Income tax (IRPF)

IRPF taxes your net income, that is, revenue minus deductible expenses. Most people are taxed under direct estimation and file form 130 each quarter, paying an advance on the annual tax return. That fractional payment is, broadly speaking, 20% of the year’s accumulated net income, subtracting what you have already paid in previous quarters and the withholdings your clients have applied, not a flat, isolated 20% each quarter. The alternative, the module system (objective estimation, form 131), calculates the tax by parameters such as staff or premises, but it is in retreat and with ever stricter limits, so today it fits few activities.

VAT

VAT applies to most of your sales and services. You file form 303 each quarter with the VAT you have charged your clients minus the VAT you have paid on your expenses, and you pay the difference. In January you also file the annual summary, form 390. Spain has three rates: the general rate of 21%, the reduced rate of 10%, and the super-reduced rate of 4%, depending on the good or service.

The self-employed Social Security contribution

Since 2023 you contribute based on real income: the system has 15 brackets according to your net income, each with a minimum and a maximum base you can choose between, and the contribution rate is applied to that base. In 2026 the minimum contribution is around €200 per month in the lower brackets and rises as your income grows. Since the exact figures are set each year, it is worth checking the current official table before deciding your base. One important detail: at the end of the year Social Security regularizes your contribution by cross-checking data with the Tax Agency, so if your real income does not match what you forecast, they will refund or claim the difference. You can adjust your base up to six times a year. Added to all this is the MEI, an extra contribution of 0.9% in 2026 already included in the quota. If you are deciding between staying self-employed and setting up a company, it helps to compare with the single-member limited liability company (SLU) and review the full process of how to create a company in Spain before taking the step.

Quarterly returns and obligations

The self-employed tax calendar is quarterly, with filings in April, July, October, and January. These are the forms you need to keep on top of, all available on the electronic office of the Spanish Tax Agency.

• Form 130. Fractional income tax payment under direct estimation. It reflects the accumulated net income and the 20% advance.
• Form 303. Quarterly VAT self-assessment (output VAT minus input VAT).
• Form 111. If you have employees or pay professionals’ invoices with withholding, you pay those withholdings each quarter.
• Annual summaries. In January, form 390 for VAT and, where applicable, form 190 for the withholdings from form 111.

Filing late brings surcharges and penalties, so a minimum of organization of your income and expenses, or simply an accountant, saves you trouble. To this is added a compliance development already underway: the Verifactu system, which requires invoicing with certified software that generates tamper-proof records with a QR code. Its rollout is phased and the calendar for the self-employed has changed, so it is worth confirming the exact date that applies to you and adapting your invoicing program in good time.

Deductible expenses and allowances

This is where a well-advised self-employed worker pays quite a bit less than one who is not. The rule is simple: any real expense, necessary for your activity and backed by an invoice, counts.

Deductible expenses in income tax

You can deduct premises rent, utilities, materials, insurance, the self-employed contribution, your accountant’s fees, and the purchase of equipment, among others. If you work from home, you can deduct a percentage of your utilities (the share proportional to the square meters assigned to the activity) and of expenses such as internet. And there is a deduction many people forget: under simplified direct estimation you can subtract an additional 7% for hard-to-justify expenses, with an annual cap. All of this requires keeping your invoices: without a receipt, the expense does not exist for the tax office. If you are a foreign national juggling your activity with your residence status, it is worth coordinating the tax and immigration sides with immigration lawyers in Spain, because a change in one affects the other.

Contribution allowances: the flat rate

The star allowance for those starting out is the flat rate (tarifa plana): you pay €80 per month (slightly more with the MEI) during the first 12 months, whatever your income bracket. It can be extended for another 12 months if you expect your net income to stay below the minimum wage. Two practical warnings: the flat rate is requested at the moment of registration, and the second-year extension is not automatic, you have to request it before the first period expires. There are also specific allowances for self-employed workers with a disability, victims of gender-based violence, mothers returning to activity, and other groups.

Self-employed taxation changes every year, and a miscalculation or a missed deadline costs you money. At ILLAY Legal we handle the tax management for self-employed workers entirely online: registrations, quarterly forms, deduction optimization, and the flat rate, without you having to set foot in an office . Tell us about your situation and we will tell you exactly what steps to take.

Frequently Asked Questions: Obligations for self-employed workers in Spain