For all self-employed people
Calendar, the online tax office and questions every self-employed person has.
Step-by-step guide
Tax calendar for the self-employed in Bizkaia
What's filed and when, month by month.
ExplainedBizkaia Tax Office or Spanish Tax Agency: what's the difference
Why in Bizkaia everything goes through the Bizkaia Tax Office.
Step-by-step guideHow to sign in to the Bizkaia Tax Office online portal
Digital certificate, B@kQ and other ways to sign in.
ExplainedThe most common mistakes when registering as self-employed
And how to avoid them from day one.
NewsSelf-employed contributions in 2026: the table by income band
How much you pay based on what you earn.
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