How Voucher Codes Work — and Why Some Codes Don’t Work

Voucher codes and online shopping

Voucher codes are short promotional references entered at checkout. They can unlock a discount, free delivery, a gift or another benefit, but every code comes with eligibility rules.

Where to enter a code

Most retailers provide a promo code, voucher code or discount code box in the basket or checkout. Enter the code exactly as shown and confirm that the saving appears before paying.

Common reasons a code fails

  • The offer has ended or reached a redemption limit.
  • The basket contains excluded brands or sale items.
  • A minimum spend has not been reached.
  • The code is restricted to new customers, an app or a membership group.
  • Another code or automatic promotion is already active.

One code may not stack

Many retailers permit only one promotional code per order. Test the available options and keep the one that produces the best final price.

Check the right version of the website

A code issued for another country, currency or retailer app may not work on the UK website. Confirm that the destination and terms are specifically for UK shoppers.

When to move on

Do not add unwanted items merely to reach a minimum spend. If the code does not apply to what you planned to buy, the sensible saving may be to skip the purchase.

DealNab tip: Never assume a code worked—check the order summary for the exact saving before submitting payment.

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