Unit Codes in e-Invoices: C62 or NIU for Pieces?

e-Invoice (e-Fatura) unit codes use international standard codes to show what the quantity on an invoice line represents (pieces, kilograms, liters, sets…). The correct code for pieces is C62. NIU, on the other hand, means "number of international units" and should not be used in place of pieces.

C62 or NIU for pieces?

The answer is C62. Both codes come from the UN/ECE unit code list, but their meanings differ: C62 means "one," that is, a single item or a single piece; NIU means "number of international units." For a T-shirt, mug or phone case you sell on a marketplace, the line unit should be C62.

In some software, the "Piece" (Adet) option may be mapped to the NIU code; check your settings. Even if your invoice is technically delivered, the buyer's accounting system may misinterpret the unit, causing problems in stock and cost records.

Common e-invoice unit codes

Examples for marketplace sellers

• Textiles and accessories: T-shirt, bag, case → C62. Socks or shoes sold as pairs → PR.
• Set products: Duvet cover set, knife set → SET. If you sell the set as a single product, C62 can also be used; what matters is staying consistent with the product listing.
• Products sold by weight: Nuts, coffee → KGM or GRM. Products sold by volume, such as detergent or olive oil → LTR.
• Products sold by length or area: Fabric, cable → MTR; carpet or wallpaper → MTK.
• Service lines: E48 (service unit) for services such as installation, HUR for hourly work.

The unit on the invoice line should match the product listing on the marketplace and your stock record. If you sell a 1 kg pack as a piece, the unit is C62 and the quantity is 1; if you sell by weight, use KGM. Setting up this mapping correctly once in your integration software also prevents quantity errors during stock synchronization.

Common mistakes with unit codes

1. Choosing NIU for pieces: The correct code is C62.
2. Using package codes as units: Package codes with the X prefix (such as XBX) indicate the packaging type and are invalid as units. Use BX for box and PA for pack.
3. Entering free text: Abbreviations that are not in the code list, such as "ad" or "adet" (piece), must not be entered in the unit field.
4. Leaving the unit inconsistent with the quantity: Showing a 250-gram product with the KGM unit and a quantity of 250 makes the quantity appear a thousand times larger; the correct entry is 0.25 KGM or 250 GRM.

For the list of other codes on the invoice (exemption, VAT withholding (tevkifat), special tax base), see the e-invoice exemption codes guide.