How to Label Sponsored Posts and Avoid Influencer Fines

Labeling sponsored content correctly means showing, clearly and from the very first second, that a post is a paid collaboration or a brand gift; vague words like "ad" or "collab" are no longer enough for Spain's competition authority, the CNMC, which has ramped up inspections of creators in 2026. If you run campaigns for several brands at once, this is the detail causing the most fines this year.

What the rules require in 2026

Spain has two layers of regulation that coexist:

Royal Decree 444/2024, which only legally binds "users of special relevance": creators with one million followers on a single platform (or two million combined) and over €300,000 in annual revenue.
The Code of Conduct on Influencer Advertising, driven by Autocontrol, the AEA and IAB Spain, in force since October 1, 2025. It's voluntary, but brands like L'Oréal Groupe and Dentsu are already requiring the AdEthics certificate to work with a creator from 2026 onward, so in practice it applies across the whole industry.

The CNMC (Spain's national markets and competition watchdog) enforces compliance. On June 3, 2026, it opened five formal proceedings against "users of special relevance" for failing to properly identify advertising content, and on July 17 the official state gazette (BOE) confirmed a technical assistance contract to systematically track this group's videos.

The mistakes that trigger the most fines

According to the CNMC itself, the rule is simple: viewers must recognize an ad immediately, without waiting until the end of a video or hunting through fine print. The most common failures are:

Using vague terms ("collab", "sp", "partnership") instead of a clear "ad" or "sponsored".
Placing the disclosure only in the caption, not in the video or image itself.
Not disclosing gifts, paid trips or event invitations, even without a cash payment.
Forgetting the disclosure on reposts, stories or content reshared from the brand's account.
Not disclosing the use of AI (cloned voice, avatar, generated image) in sponsored content.

A study cited by European regulators found that 77% of the content analyzed failed to comply with some part of these disclosure rules, so the real margin for error is far bigger than it looks.

How to stay organized with multiple brand deals

The more collaborations you juggle, the easier it is for one unlabeled post to slip through. A few practices that help:

Write the exact labeling requirement each brand asks for into the brand collaboration contract, instead of relying on memory.
Build a per-post checklist: where the disclosure goes, at what second, with which exact wording.
If you manage a roster of creators from an agency, centralize which campaign requires which type of disclosure, so criteria don't get mixed up between brands.

This is where a proper campaign management tool beats scattered notes: each content task can carry that brand's specific labeling requirement attached to it, leaving a record if the CNMC ever asks for explanations.

What happens if you don't label correctly

The CNMC can open sanctioning proceedings against the creator, the brand and the agency involved. Penalties have gotten tougher in 2026, with a particular focus on protecting younger audiences from covert advertising.

Frequently asked questions

Is putting "#ad" in the caption enough? Not always. The CNMC requires the disclosure to be visible and understandable immediately, so in video it must appear within the first seconds and stay on screen throughout, not just live in the accompanying text.

Do I have to disclose a brand gift even if I wasn't paid in cash? Yes. Both Royal Decree 444/2024 and the Autocontrol Code treat any form of compensation as advertising, including free products, trips or event invitations.

Can the CNMC only fine the influencer? No. It can open proceedings against the creator, the brand and the agency that managed the collaboration, since disclosure responsibility is considered shared.

Does this only affect macro-influencers? The law (Royal Decree 444/2024) is only binding for "users of special relevance," but the Autocontrol Code and brand requirements like AdEthics certification already apply, in practice, to creators of any size.