Being self-employed in Bizkaia, Gipuzkoa, Araba or Navarra: where it is worth registering in 2026

In which foral territory is it best to be self-employed? The direct answer: the one where you carry on your activity, because you cannot choose it freely. Between Bizkaia, Gipuzkoa, Araba and Navarra, the real differences for a self-employed worker lie in personal income tax (IRPF) and, above all, in the digital invoicing obligation, not in the contribution.

At Grupo Asegi, a Basque full-service advisory firm based in Bilbao, Donostia and Vitoria, what generates most work for a self-employed worker is not their IRPF rate but complying with TicketBAI or Batuz according to their territory.

The question “where do I pay least as a self-employed worker?” leads to bad decisions. A tax domicile in a territory where you do not work can be reassessed, and the theoretical IRPF saving between foral territories rarely offsets the risk. What is useful is knowing what each Foral Tax Authority will ask of you and getting ready for it.

First things first: you do not choose your foral territory, where you work determines it

A self-employed worker’s tax domicile is where the management of the activity is located, not wherever suits you. If your workshop, your office or your client base is in Gipuzkoa, you pay tax to the Gipuzkoa Foral Tax Authority even if you live ten minutes away in Bizkaia.

What you can optimise is how you apply the rules of the territory you fall under: deductible expenses, the módulos regime where relevant, and planning of instalment payments.

IRPF: your Foral Tax Authority sets the rate

Each foral territory has its own IRPF rate scale, its own personal and family allowances and its own reductions. The differences between Bizkaia, Gipuzkoa, Araba and Navarra do exist, but for most self-employed workers they are second-order: your actual deductible expenses and your net income weigh more than the marginal band.

Navarra, moreover, applies its own scale under the Economic Convention, different from that of the three Basque territories.

The self-employed contribution (RETA): this one is state-level

Here there is no foral difference. Contributions to the Special Regime for Self-Employed Workers depend on the state system of contributions based on actual income, the same in the four foral territories.

What does change by territory are the grants that subsidise or top up that contribution, which are indeed foral or local (we look at them below).

The digital invoicing obligation: here everything does change

This is the factor that really separates a self-employed worker in one territory from one in another:

• In Bizkaia, the system is Batuz, which combines TicketBAI, the Libro Registro de Operaciones Económicas (LROE) and draft returns. It is the most demanding.
• In Gipuzkoa and Araba, TicketBAI without the Batuz LROE.
• In Navarra, its own verifiable invoicing system, different from TicketBAI.

In practical terms: two identical self-employed workers, one in Bilbao and one in Donostia, carry different administrative burdens. If you want to understand the detail, we set it out in TicketBAI vs Batuz vs LROE, and which program to use in the TicketBAI software comparison.

Table: being self-employed in the four foral territories

Start-up grants: what each territory offers

In addition to the state reduced rate for new self-employed workers, the Provincial Councils and the municipalities run entrepreneurship grants of their own that top up the contribution or subsidise the start-up.

They do not coincide across territories either in funding or in deadlines. We compare those of the four capitals in Grants for entrepreneurs: Bilbao vs Donostia vs Vitoria vs Pamplona.

Common mistakes when registering in the wrong territory

• Registering where you live and not where you work. This is the fast track to a tax check.
• Ignoring the digital obligation of your territory. Starting to invoice in Bizkaia without complying with Batuz brings a penalty.
• Not applying for the local grant in time. Many require the application before registration or right at that moment.
• Working out the IRPF alone. The real administrative cost lies in digital invoicing, not in the tax band.

In summary: which territory suits you, case by case

• You clearly work in one territory: that one is yours. There is no choice, and forcing one is expensive.
• You work across two (you live in one, your clients are in the other): define clearly where the effective management sits. Here an adviser prevents the mistake.
• You are concerned about the administrative burden: Bizkaia (Batuz) demands more than Gipuzkoa or Araba. Budget for the software and the advisory work accordingly.
• You are in Navarra: your framework is the Convention, not the Agreement, and your invoicing is not TicketBAI. Do not mix sources.

The honest summary: as a self-employed worker you almost never choose your foral territory. What you decide is how you comply with it and who helps you do so without unpleasant surprises.

Are you about to register and unclear about what your Foral Tax Authority will ask of you? Grupo Asegi handles tax for self-employed workers in the four foral territories from Bilbao, Donostia and Vitoria. We register you properly first time and leave your digital invoicing sorted. Talk to our team.