The epígrafe IAE is the code from the Tax on Economic Activities that classifies your activity as a freelancer. You choose it when registering with the modelo 036/037. Most freelancers are exempt from paying the IAE, but still have to declare their epígrafe.
The epígrafe IAE is the code that defines what you do in the tax office's eyes. It's part of the Tax on Economic Activities and you choose it when doing your alta censal: there's an epígrafe for designers, another for consultants, another for retail, and so on.
Although it's called a tax, most freelancers don't pay the IAE: those who invoice under €1,000,000 a year are exempt. But the epígrafe still has to be declared, because it classifies your activity and determines, for example, whether your clients apply retención.
Choosing the right epígrafe matters more than it seems: it defines how your activity is taxed and whether you carry retención on your invoices. If you do several things, you can register under more than one epígrafe.
Most don't: freelancers invoicing under €1,000,000 a year are exempt. Even so, you must declare your IAE epígrafe when registering, because it classifies your activity for tax purposes.
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