If you have arrived at ATK with a code in hand and no interest in reading the whole promotions page first, the route is short: fill the basket, open the order summary, type 25OFF into the discount code field, press Apply, check that a discount row appears, then pay. The code is a straight 25% reduction on eligible basket items, so the work is mostly confirming the total actually moved before you hand over card details.
ATK is an ordinary online store: you add items to a basket and check out. There is no way to attach the code to an empty basket, so browse and add what you want before touching the discount field. No product catalogue details are stated for ATK, so shop as you normally would and let the subtotal settle before you start applying anything.
One thing worth doing while you shop is keeping an eye on what kind of items you are adding. Sale, clearance, bundle, gift card and new release items are often excluded from percentage codes. That does not stop you ordering them, but it changes what the 25% is calculated on.
The field lives in the order summary. You will find it on the cart or basket page, or on the checkout page itself. On mobile the summary is usually collapsed behind a 'Show order summary' toggle, so tap that first rather than assuming the field is missing.
If you are creating an ATK account as part of checkout, complete the account step first and apply the code afterwards. Applying mid-signup is the most common way to lose an entry you thought had gone through.
Type the code in and select Apply rather than pressing Enter. The code is normally case-insensitive, so capitals are not the issue if it fails; a trailing space copied in from elsewhere often is. Typing it manually avoids that.
Then do the one check that matters: look for a discount row in the summary and confirm the total has fallen by 25% of the eligible subtotal. The maths scales with order size, so a £40 basket becomes £30 and a £120 basket becomes £90. If the drop is smaller than expected, the likely explanation is that only part of your basket is eligible and the reduction has been applied to that portion alone.
Once the discount is showing, enter delivery and payment details and place the order. Two points to note before you confirm. The discount reduces the goods total only; delivery is charged separately and is not discounted. And because the goods total is now lower, a basket that previously qualified for free shipping may drop below the threshold, which can eat into part of what you saved. Check the delivery line in the summary alongside the discount line rather than looking at one in isolation.
Run through these in order rather than abandoning the order:
Retype 25OFF manually in case a stray space came along with a paste.
Remove any other code already sitting in the basket. Usually only one code can be applied at a time, and percentage codes rarely stack with an existing site-wide sale or another voucher.
Check your basket for excluded items such as sale, clearance, bundle, gift card or new release lines.
Confirm you are on the correct regional ATK storefront.
Try again in a private browser window.
If it still refuses, a minimum spend threshold is a possibility; some percentage codes carry one, and whether ATK requires one for this code is not stated. Many codes are also limited to one use per account, so a previous order on the same account may be the reason.
Exact exclusions, minimum spend, stacking rules, shipping terms and per-customer limits are not specified here and should be checked on ATK's terms or promotions page. The discount is a percentage reduction on eligible items at checkout, not store credit or a rebate, so if it is not visible in the summary before payment, it is not applied.
Web page: ATK Discount Code 25OFF: The Same Basket Priced With and Without It
Colab notebook: ATK Discount Code 25OFF: Common Mistakes That Cost You the 25%
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