Navigating ITV's 2027 closed caption mandate

Closed captions are no longer a nice-to-have for UK TV advertising. After Channel 4 led the way in 2026, the UK's biggest commercial broadcaster is now following suit, and that turns captioning into the standard for almost every UK TV campaign.

“By January 2027, ITV will require closed captions on every advert, from every advertiser, across all of its channels and its streaming service, ITVX.”

This is the moment captions go mainstream. Here is everything you need to know about the ITV mandate and how to get your workflow ready before it lands.

Key takeaways

• By January 2027, ITV requires closed captions on all advertising across its linear channels and ITVX, with no exemptions.

• With ITV and Channel 4 both requiring captions, and other broadcasters likely to follow, captioning every UK TV ad by default future-proofs your assets for any media plan, now or later.

• Captions reach far beyond compliance: around 80% of people who use captions don't identify as deaf or hard of hearing.

Frequently asked questions

What exactly is the ITV mandate?

By January 2027, ITV will make closed-caption subtitling mandatory for all advertisers. It applies across every ITV channel and ITVX, and covers all of its roughly 2,000 advertisers, from national brands to small regional businesses.

Why is this happening now?

ITV calls 100% subtitled advertising a long-term goal, held back until now by the number of small regional brands it works with. With Channel 4's mandate already live since March 2026, the industry has shown captioning at scale is achievable. ITV's move makes it the norm.

What is the difference between closed captions and subtitles?

Closed captions are text the viewer can switch on or off. Alongside dialogue, they include sound cues and speaker labels. In UK TV advertising the two terms are used interchangeably, and ITV describes its requirement as closed-caption subtitling.

Why does ITV's mandate matter so much?

Scale. Few UK TV plans leave ITV out, so in practice this mandate changes what a finished TV ad looks like. Together with Channel 4, captions will now be required by two of the UK's largest commercial broadcasters.

Waiting for the media plan before deciding on captions is a false economy. From January, an uncaptioned ad can’t run on ITV or Channel 4, and as more broadcasters follow suit, it will work on fewer channels every year. Captioning every asset by default keeps it ready for whatever media you buy next.

How can Cape.io help with the ITV mandate?

Cape.io can set your account to include closed captions by default for UK deliveries, so every ad going to ITV and Channel 4 is captioned without an extra step.

Who benefits from closed captions?

Far more people than you might think. According to ISBA, around 18 million people in the UK are deaf, have hearing loss or have tinnitus. Beyond them, captions are now an everyday viewing habit:

• Younger viewers: Gen Z and Millennials are especially likely to watch with captions on.

• Sound-off viewing: many people now keep subtitles on by default, at home and on the go.

• Busy, noisy homes: captions keep the message clear when the volume can't.

How does this affect creative delivery?

Closed captions are added at the delivery stage, but they need to be planned from the start. The mandate lands in January, straight after the busiest delivery period of the year. If captioning isn’t in the budget, it can turn into an unexpected cost at the last minute. To avoid that:

• Add accessibility, including closed captions, to the production brief and budget.

• Make sure on-screen text and key visuals leave room for caption placement.

• Check spots already in rotation, as they may need captions before they run again in 2027.

Does captioning actually improve ad performance?

Yes. When viewers can both hear and read a message, comprehension and recall improve. Captioned videos can see a 12% increase in view-time, and brand recall typically sees an 8% lift when captions are present. As captioning becomes the UK standard, uncaptioned ads will increasingly stand out for the wrong reasons.

How to prepare

Want help getting ready for the ITV mandate? Contact us at https://cape.io/register or take a look at our solution page.