When Do You Need a New GTIN? The GS1 Rules in Plain English
When does a new or changed product need a new GTIN?
Short answer
Every new product needs its own GTIN, and an existing product needs a new one when a change is something customers or trading partners must be able to tell apart, such as new net content, a formula change that alters the required label information, or a size or weight change of more than 20%. Promotions and changes to case counts call for new numbers only on cases and pallets, not on the retail unit.
On this page
You changed something about a product: a bigger jar, a new scent, a holiday sleeve, a reworded label. Now you need to know whether it keeps its barcode. Getting this wrong costs money either way. Reusing a GTIN for a product that buyers need to tell apart confuses retailer systems, and changing it when you didn't need to means new listings and new item setups.
GS1 answers the question in the GTIN Management Standard, the rule set brand owners and retailers agreed on for exactly this decision. The current version is Release 1.1, ratified in September 2023 (GTIN Management Standard). GS1 also publishes the same rules as browsable web pages (GS1 GTIN Management). This guide is the plain-English version.
The three questions behind every rule
The standard starts from three guiding questions. At least one has to apply before a GTIN change is required:
- Will customers or trading partners be expected to tell the new or changed product apart from the current one?
- Is there a regulatory or liability disclosure the customer or trading partner needs to know about?
- Will the change substantially affect the supply chain, meaning how the product is shipped, stored or received?
The standard also separates two situations. A new product is one that hasn't been in your portfolio or on the market before, and it always gets a new GTIN. A product change modifies something already on sale, and the standard spells out which changes need a new number.
These rules are a minimum. You may change GTINs more often if your customers need it, and any local law or regulation that is stricter takes precedence over the standard. This is general information, not legal advice. Regulated healthcare products follow a separate GS1 rule set, the Healthcare GTIN Allocation Rules, and other regulated goods can carry extra requirements.
The ten rules at a glance
Here are the ten rules from section 2 of the standard. "Retail unit" means the item a consumer buys. "Higher levels" means packs, cases and pallets.
| Rule | What triggers it | New GTIN on retail unit? | New GTIN on higher levels? |
|---|---|---|---|
| 1. New product introduction | A product that wasn't in your portfolio before | Yes | Yes |
| 2. Declared formulation or functionality | A change that alters legally required label information and that customers are expected to notice | Yes | Yes |
| 3. Declared net content | Any increase or decrease in the declared weight, volume or count | Yes | Yes |
| 4. Dimensions or gross weight | A change of more than 20% on any axis or in gross weight | Yes | Yes |
| 5. Certification mark | Adding or removing a mark such as kosher, UL or CE | Yes | Yes |
| 6. Primary brand | A change to the brand customers recognize most | Yes | Yes |
| 7. Time-critical or promotional product | A promotion tied to a date or event that changes supply chain handling | No | Yes |
| 8. Pack or case quantity | A change in units per case or cases per pallet | Not applicable | Yes |
| 9. Predefined assortment | Changing, adding or replacing an item in a fixed bundle | Yes | Yes |
| 10. Price on pack | Adding, changing or removing a price printed on the package | Yes | Yes |
The rules that catch small sellers most often
Every variant is its own product
Each size, color, style or flavor is a separate product with its own GTIN. One of the standard's examples is a jeans line where every combination of style, color and size gets a unique GTIN. GS1 US says the same about package count (GS1 US FAQ). The standard even treats a Spanish-only version of an English-language package as a new product.
Net content changes, in either direction
Any change to the declared net content needs a new GTIN, whether it goes up or down. The standard's examples include diapers going from a 14-count to a 12-count, and a snack bag going from 24 oz to 28 oz. A bonus pack counts too, if the extra product is part of the declaration. A 4-count pack relabeled as a 6-count gets a new number.
The 20% rule for size and weight
A change of more than 20% to any physical dimension or to gross weight requires a new GTIN. One of the standard's examples is a switch from plastic to glass packaging that takes a product's gross weight from 0.75 lb to 1.5 lb. Don't try to stay under the limit with a series of small changes. The standard calls frequent cumulative changes made to avoid the 20% rule an unacceptable practice, and says trading partners should be told about all dimension changes.
Bundles and gift sets
A predefined assortment is a fixed combination of two or more items sold as one unit, like a gift set. It gets its own GTIN, separate from the GTINs of the items inside it. If you swap any item in the set, for example replacing the conditioner in a shampoo-and-conditioner pack with a hair mask, the set needs a new GTIN.
Formula changes that reach the label
A formulation or functionality change needs a new GTIN only when both conditions hold: it changes legally required declared information, and customers or partners are expected to notice. Adding nuts, a new allergen, qualifies. So does cutting sugar by half to label the product "low sugar."
Promotions and case changes stay at the case level
Holiday graphics, a limited-time logo, an attached coupon or "special offer" printing don't change the retail unit's GTIN. That holds as long as net content stays the same and dimensions or weight don't move by more than 20%. The cases and pallets carrying the promotional version do get new GTINs so the supply chain can track them. The same applies when you go from 8 units per case to 12. Case-level numbers and their barcodes are covered in ITF-14 shipping carton barcodes.
Changes that don't need a new GTIN
Because a change has to fit one of the ten rules, plenty of everyday updates leave the GTIN alone:
- Declaring a feature the product always had, on new packaging. The standard says this specifically.
- Marketing statements that aren't tied to pricing, brand or regulation, such as a suggested serving size.
- A size or gross-weight change of 20% or less. Tell your trading partners anyway.
- Promotional packaging, at the retail level.
- A graphics refresh that doesn't touch the primary brand, net content, certification marks, a printed price or the dimensions.
One more case comes from the General Specifications rather than the standard. A product withdrawn from the market can come back under its original GTIN if it returns unchanged (GS1 General Specifications).
Used, refurbished and discontinued products
The GTIN Management Standard covers new trade items only. For used, refurbished or repurposed goods, it points to section 2.1.15 of the General Specifications. Those rules say the original GTIN is enough when nobody needs to tell new and used units apart. If you adapt or refurbish an item in a way that changes what its label declares, you allocate a new GTIN and keep a record linking it to the original.
Retiring a product doesn't free up its number, either. Since January 1, 2019, the General Specifications have said a GTIN assigned to one trade item must not be reassigned to a different one, with narrow exceptions, mainly for numbers that were never shared with trading partners or were shared only as drafts. Plan your numbering capacity with that in mind.
Bottom line
Run any change through the three questions, then check it against the ten rules. Most decisions come down to whether a buyer or partner needs to tell the difference. When you do need a new number, assign it from your prefix or license another GTIN, confirm its check digit, and update every listing and item setup that used the old one. Getting numbers in the first place is covered in how to get UPC barcodes, and the GTIN formats themselves in what a GTIN is.