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Complete your tax details

Reviewed on 4 October 2026
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Your tax details are the first step of onboarding. With them OnBio issues your invoices and self-billed invoices, decides which tax your sessions carry and shows your buyers who sells, as the Digital Services Act requires. Filling them in takes about ten minutes if you have your details at hand.

Before you start

  • Have your tax ID and your full name or the company name of your company at hand.
  • Have your tax address, which is the one the tax authorities hold.
  • If you are a company, have your commercial registry and the registration details.
  • Check that you are the owner or have the administration role.

Write the details

Open Onboarding in the side menu and select Tax details. With onboarding complete, they are in Settings.

Tax details of Lucía Navarro as self-employed with an address in València, her contact and her professional activity.
  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.

Declare the reduced withholding

If you are self-employed with a professional activity and started this year or in the two before without having had a professional activity the previous year, your self-billed invoices can carry a 7% withholding instead of 15%.

  1. 1. Select Declare in Reduced 7% withholding.
  2. 2. Choose the Start year.
  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 of onboarding. From your first sale, every invoice and self-billed invoice carries these details. The reduced withholding applies until 31 December of the second year after the start year. The screen says the exact date it ends.

Keep in mind

  • The tax ID cannot be changed after the first invoice. If the check character does not match the usual calculation but your tax ID is correct, tick I confirm the tax ID is correct.
  • The postcode decides the tax of your sessions and services: VAT on the mainland and the Balearic Islands, IGIC in the Canary Islands and IPSI in Ceuta and Melilla.
  • OnBio only accepts creators with tax residence in Spain.
  • Your buyers see the contact phone and email in the seller information of your store.
  • Companies and business activities carry no income tax withholding on their self-billed invoices.
  • Only the owner signs the reduced withholding declaration.

Frequently asked questions

How do I change my tax details after onboarding?

Open Settings and select Tax details, change what you need and select Save and continue. The changes apply to the invoices issued from that moment. Invoices already issued do not change. The tax ID cannot be changed once the first invoice is issued.

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