Entering a coupon code takes seconds, but small details decide whether you actually save money. This guide walks through the process on a typical online store and explains what to do when a code does not work.
Step 1: Read the offer terms before you shop
Most failed codes fail for a predictable reason written in the terms. Before you start filling your basket, check:
- Who can use it — new customers only, members only, students, or everyone.
- What it applies to — the whole order, one category, a specific product or a particular subscription plan.
- Minimum spend — many codes need a basket above a certain value, often before tax and shipping.
- Country — a code for a store's US site usually will not work on its UK or Australian site.
- End date — and the time zone it is based on, if the store states one.
On PromoCodely, open Terms, eligibility & source on any offer to see these details and where we confirmed them.
Step 2: Add items and go to the basket or checkout
Stores put the promo field in different places. Common labels include "Promo code", "Discount code", "Coupon", "Voucher" or "Gift card or discount code". It may appear:
- on the basket (cart) page, under the order summary;
- on the payment step of checkout;
- behind a small link such as "Have a code?" that you need to click to reveal the box.
If you cannot see it, finish entering your address and delivery details — some stores only show the field on the final step.
Step 3: Paste the code exactly
Copy the code rather than typing it, and make sure no space was copied before or after it. Codes are usually not case-sensitive, but some are, so keep the capitalisation as shown. Then click Apply.
Step 4: Check the discount actually appears
Do not rely on a green "Code applied" message alone. Look at the order summary and confirm:
- a discount line shows the expected amount;
- the total has gone down by that amount;
- no new charge (such as a shipping fee) has been added that cancels it out.
For subscriptions, check the price shown for future billing periods as well. An introductory discount often applies only to the first month or year.
Why a code gets rejected — and what to try
| Message or symptom | Likely cause | What to try |
|---|---|---|
| "Code is invalid" | Typo, extra space, or the code belongs to a different country site | Paste again; confirm you are on the right regional site |
| "Code has expired" | The promotion ended or reached its usage limit | Look for a current offer on the store's page |
| "Not valid for items in your basket" | Excluded brands, sale items or categories | Check the terms for exclusions; remove excluded items to compare |
| "Minimum spend not met" | Basket is below the threshold | Check whether the minimum is before or after other discounts |
| Code accepted but no discount | The offer applies to a different product, plan or billing period | Re-read what the code covers |
| "Only one code per order" | Another promotion is already applied | Remove the other code and compare which saves more |
Can you stack more than one code?
Usually not. Most stores allow one promo code per order, although an automatic sale price, a gift card or loyalty points can sometimes be combined with a code. The store's own terms decide this — if it is not stated, assume codes cannot be combined.
Tip: if a code works for you, use the "Did it work?" buttons on PromoCodely. If it fails, report it and we will recheck it against the source.
Keep a record
Take a screenshot of the final order summary showing the discount. If the charge on your card or the first renewal does not match, the screenshot makes it much easier to resolve with the store's customer service.
A worked example
Imagine a code that reads "15% off orders over 50, excludes sale items". Your basket holds a full-price jacket at 40 and a reduced T-shirt at 20, so the basket shows 60. The code still fails, because only the jacket counts towards the minimum, and 40 is below 50. Adding another full-price item, or swapping the T-shirt for a full-price one, would let the code apply, but only if you actually want that item. A discount that pushes you to spend more than you planned is not a saving.
The same logic applies to subscriptions. A code for "first year of the annual plan" will not apply if the monthly plan is selected, even though it is the same product.
Frequently asked questions
Can I add a code after I have placed my order?
Usually not. Most stores apply discounts only before payment. Some customer service teams will honour a code you forgot to apply, especially if the order has not shipped, but this is at their discretion, so it is worth a polite message rather than an expectation.
Why did the price go up after I entered my address?
Tax and shipping are often calculated only after the delivery address is known. Check whether the code's minimum spend is measured before or after these are added. It is usually before.
Is it safe to use codes from browser extensions?
Some extensions are run by reputable companies and some are not. An extension that can read every page you visit has a lot of access, so install only well-reviewed ones from official browser stores and read what permissions they ask for.
Do codes work in the store's app?
Often, but not always. Some codes are web-only and some are app-only. The terms usually say which.
