What is LRN (Local Reference Number)? [2026]

TL;DR

Quick definition

LRN is the declarant's internal reference created before the customs system issues an MRN. It helps track the case in the filing workflow, but in most live UK road movements the operationally relevant reference is still the MRN. The distinction matters because the wrong reference can confuse carrier instructions, GVMS handling or internal escalation.

LRN (Local Reference Number) is the reference number assigned to the declaration by the person submitting the declaration (i.e. customs agency system), before the declaration will be accepted by the customs system (HMRC/PUESC).

LRN vs MRN – the difference

LRN: Assigned by the Customs Agency (our "internal case number"). Exists only in the agency's computer and on the preliminary printout.
MRN: Issued by the Customs Office (system). This is the official national number.

When do we use LRN?

In the system GVMS in the UK, when importing, you can sometimes use the LRN number (instead of MRN) if making an "Arrived" declaration in specific procedures, but in 99% of international transport cases the driver needs the MRN. The LRN is only a "working version".

What the current official guidance means in practice

For operational work, the current procedural rules, declaration fields and relief conditions should be checked directly against the official guidance. For this topic, the core reference points are European Commission, GOV.UK / HMRC.

Operational watch-outs

Most delays come from inconsistent data between the commercial invoice, packing list, tariff classification, reference numbers and transport assumptions. Before shipment release, confirm who is responsible for clearance, whether the data set is complete and when the declaration must be filed.

Documents and data to prepare

The minimum working pack worth preparing before speaking to customs support or filing a declaration includes:

commercial invoice with a complete goods description
packing list with quantities, weight and package count
HS/CN code and origin information
EORI number and the party responsible for the declaration

Practical notes for UK-PL operators

For regular flows, keep a stable data template: goods description, HS code, origin, Incoterms, carrier details and source documents. This shortens response time and reduces border corrections.

Official sources

EU Commission (Customs procedures) — European Commission, 2026-03-04
UK GOV (Importing into the UK) — GOV.UK / HMRC, 2026-03-04
GOV.UK: Customs Declaration Service — GOV.UK / HMRC, 2026-03-04

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