Your Tax Office and Social Security procedures, made easy
News, clear answers to common questions and step-by-step guides. No jargon, with examples.
What the Bizkaia Tax Office compliance certificate is and what it's for
The document that shows you don't owe the Tax Office anything. You're asked for it for grants, public contracts, subcontracting and banks.
Read the articleMódulos in Bizkaia for 2026: which activities can use the simplified scheme
The provincial order that sets the activities and how to know if yours is included.
NewsSelf-employed flat rate in 2026: requirements and how much you pay
Who can apply and how long it lasts.
NewsSelf-employed contributions in 2026: the table by income band
How much you pay based on what you earn.
Tax status certificate: what it says and how it differs from the compliance certificate
Two certificates that often get mixed up, explained in a minute.
ExplainedMy tax certificate came out negative: what it means and how to fix it
The most common reasons and what to do in each case.
ExplainedHow long a Tax Office certificate takes in Bizkaia and what it costs
Timeframes, price and how long it's accepted for.
ExplainedIAE registration in Bizkaia: when form 036 is enough
When the Tax Office alone is enough and when you also need Social Security.
ExplainedHow much it costs to be self-employed in Bizkaia
Contribution by income band, taxes and costs worth bearing in mind.
ExplainedWhich VAT scheme do I have: standard, equivalence surcharge, exempt or módulos
How to know which one applies to you based on your activity.
How to register as self-employed in Bizkaia, step by step
Tax Office and Social Security at once: what to decide first, what gets filed and what happens next.
Step-by-step guideCertificate of not having to file an income tax return in Bizkaia
Who needs it and how to request it: grants, benefits, renting or a mortgage.
Step-by-step guideIAE certificate in Bizkaia: how to prove you're registered
What you're asked for it for and how to get it.
Step-by-step guideWhich IAE heading applies to me: how to choose it properly
With examples of the most common jobs.
Step-by-step guideI'm a foreigner: what I need to become self-employed in Bizkaia
NIE, work permit and Social Security number.
Step-by-step guideHow to change your tax address with the Bizkaia Tax Office
If you've moved, this is what you have to report and when.
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