Got a backroom full of stock that should’ve sold last season? If so, it’s likely a good time to hold a flash sale, one of the fastest ways to turn excess stock that’s not moving into cash.

However, while the idea of holding a flash sale might be enticing, there are a few things you should consider before setting out the sale signs.

Here’s how to run one.

What Is a Flash Sale?

As the name implies, a flash sale is a sale that is extremely temporary in nature. The idea is to heavily discount items, offering specific products at a can’t-miss price, tapping into buyers’ Fear of Missing Out (FOMO) to drive impulse purchases. Flash sales can last just a couple hours, but more commonly, they run for 48-72 hours.

Think about Amazon’s Prime Day or some Boxing Day sales, but those are big tent-pole type events that customers have come to expect and even plan for. A flash sale doesn’t haven’t to happen during a holiday or other special event; they can be made special all on their own.

Why Run a Flash Sale?

There are a few reasons retailers turn to flash sales, and they often work together.

A change of season is a natural trigger because it’s the perfect excuse to clear out overstock or seasonal items before they lose their value and start eating up space you need for what’s coming next.

Beyond clearing shelves, a steep, short-lived discount is also one of the fastest ways to get people through the door (or onto your site).

And underlying both of these is the real engine behind a flash sale: FOMO. The urgency of a limited-time deal not only can clear out aging stock, but it often gets customers browsing and buying other things while they’re in your shop.

Whatever combination of reasons applies to your store, the way you talk about the sale matters. Your messaging needs to make people feel like they’ll genuinely miss out if they don’t act now.

5 Steps to Holding a Successful Flash Sale

1. Pick what to put on sale. Look at what’s overstocked or seasonal, particularly stock that’s taking up space or losing relevance fast. These are the items with the least to lose and the most to gain from a deep discount. For example, Easter candy quickly loses its relevance the day after Easter, and generally can’t be stored until the coming year.
2. Decide your timing. Some flash sales are expected, like Black Friday or Boxing Day, where customers already anticipate a deal. Others work better as a surprise, catching shoppers off guard and creating buzz in the moment.
3. Announce on short notice. Give customers 24 to 48 hours’ notice, max. Any longer, and you risk a dip in regular sales as people wait for the discount to kick in.
4. Notify customers across all channels. Use signage, email, social, and SMS to spread the word. A simple email cadence works well: one the day before, one the day of, and a final reminder in the last hour.
5. Set it up to enforce the cutoff. Update your EPOS system to ensure the promotion is applied correctly at checkout, and make sure the discount is limited to the sale window so no one gets the deal after it’s over.

A well-timed flash sale can clear your shelves and bring in new customers, but only if your systems can keep up with the rush. If you’re ready to make sure your EPOS system is set up to handle the promotion (and the surge), contact us.