Do countdown timers work in a sale?

Sometimes. A real deadline can hurry people along, though the regulator's own review says how much depends on the shop and the offer. A fake one, meaning a countdown that quietly resets instead of ending, is banned outright. Most banned practices are crimes, and they carry fines of up to £300,000, or 10% of worldwide turnover if that's higher.

Our interest, stated first. We build websites and landing pages and run paid ads, and countdown timers are sold as a way to make those pages sell more. So the answer that would suit us is that a timer is always worth it. It isn't.

This piece is part of our series on sale prices and urgency, checked, which sets out what the evidence and the regulators say, with a link to each source. None of it is legal advice.

What the research shows

According to the regulator's evidence review, limiting how long a promotion runs has been found to speed up purchases, though the effect "likely depends on the context". The same review reports a study in which the people who took timed deals "ended up, on average, with lower payoffs than those who waited". What nobody has studied is what a timer does to a small shop's sales.

When a countdown is legal

Only if the deadline is real. Since April 2025, UK law has banned falsely claiming that an offer is available for a limited time in order to rush someone into a decision. It doesn't matter whether anyone was actually fooled: a fake deadline is banned in itself.

The CMA's example is a countdown clock after which "the offer does not in fact end, but continues and the countdown clock restarts". Even a genuine end date can mislead, it adds, "for example, because a substantially similar offer appears within a short period". And its 2023 examples include a checkout timer that starts again whenever the page is refreshed.

Running a countdown you can keep to

• Set the end date first, and then keep to it. If the offer might run on, leave the clock off altogether.
• Don't follow a timed offer with one that's substantially the same.
• If a plug-in adds the timer, check whether it resets for each visitor, or whenever the page is refreshed.

The same honesty applies to low-stock messages, to the price you're counting down to and to fees added at checkout, and later in the series we look at whether anyone enforces any of this against a small shop. A sale page follows the same landing page structure as any other, and building one is part of our websites work. Whether a sale is the right move at all, though, is a question for your digital marketing strategy.