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Tax details

Reviewed on 4 October 2026
On this page
Tax details of Lucía Navarro as self-employed with an address in València, her contact and her professional activity.

This is the first step of onboarding. With these details OnBio issues your self-billed invoices, decides their VAT and their withholding and shows your buyers your trader details. The tax ID cannot be changed after the first invoice, so check it carefully before saving.

After onboarding you still have your tax details here, along with the reduced withholding.

How to get there

Select Tax details in Onboarding. With onboarding complete, open Settings in the side menu and select Tax details.

What you can do

  • Choose whether you invoice as self-employed or as a company.
  • Write the tax address, which decides the tax of your self-billed invoice.
  • Give the phone and the email your buyers see as the seller's details.
  • Say whether your activity is professional or business and since when you carry it out.
  • Declare the reduced 7% withholding if you started your activity recently.

Step by step

Complete the tax details

  1. 1. In Regime, choose Self-employed or Company.
  2. 2. Write the Tax ID (NIF) and your Full name or company name.
  3. 3. Tick My tax residence is in Spain.
  4. 4. Fill in Address, Postcode, Town and Province.
  5. 5. Fill in Phone with the country prefix and Contact email.
  6. 6. Choose the Type of activity and the Start date of the activity.
  7. 7. Select Save and continue at the bottom of the page.

Declare the reduced withholding

  1. 1. Select Declare in Reduced 7% withholding.
  2. 2. Choose the Start year of your activity.
  3. 3. Tick I declare that I had no professional activity the year before the start.
  4. 4. Write the Code from your authenticator app.
  5. 5. Select Sign declaration.

What happens next

You move on to the payout account step. OnBio uses these details on every invoice and self-billed invoice from your first sale.

Keep in mind

  • If you are a company, you also have to give your Commercial registry and the Registration details (volume, folio, sheet).
  • OnBio sells all your products and charges each buyer their tax. Your self-billed invoice carries VAT on the mainland and the Balearic Islands and goes without tax, under the reverse charge, in the Canary Islands, Ceuta and Melilla.
  • The reduced withholding is for those who started their professional activity that year or in the two before without having carried it out the previous year.
  • If the check character of the tax ID does not match the usual calculation but the tax ID is correct, tick I confirm the tax ID is correct. to go on.
  • If your role can see these details but not change them, the screen tells you.
  • If you provide healthcare or private tuition, Ask for exempt sales takes you to the settings of Business. There you ask to sell your sessions in your name and without VAT.

These roles can open this screen: owner, admin and accounting.

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