Overview
Internal Trading is the process by which goods and services are bought and sold between Cambridge University departments using UFS Accounts Receivable (AR) and Accounts Payable (AP) modules. A technical interface is run between the two modules to push AR internal transactions into the AP module awaiting secondary approval.
The successful creation of an internal transaction requires all correct internal data to be used.
On this page:
Introduction
Defining a University internal customer
Internal customers are those that are part of the legal entity of the Academic University e.g. the Schools, faculties and departments.
HMRC also include Cambridge University Press and Assessment (CUPA) and Cambridge Enterprise as part of the University’s VAT Group and these both have the same VAT registration number as the University. Therefore, the tax code of ‘internal’ should be allocated for transactions with all these organisations.
However, as only University departments are using UFS you must not use either internal trading or raise an internal invoice to either CUPA or Cambridge Enterprise, as internal trading invoices are only used for trading between University departments using the entity code ‘U’ in UFS.

Internal customer numbers
- Each internal customer has a two-letter 'department code' which in most instances coincides with the two letters at the beginning of their departmental cost centres.
- Every internal customer has been pre-allocated a customer number that MUST be used when creating internal transactions. These internal customer records have been created centrally and include data that enables the Internal Trading process to work.
- Any amendments to, or new internal customers can only be successfully carried out by the Finance Division - forward any queries to ARCustomer@admin.cam.ac.uk
| A full listing of departments, their two-letter code and their Accounts Receivable internal customer number is available from the Finance Division website |
Sub-departments within a larger department
Sub-departments within larger departments must be treated as an additional 'Bill To' location within the main department's customer number.
For example: Temporary Employment Services (TES) of Personnel Division has its own cost centres. Departments needing to raise an invoice to TES must use the internal customer number allocated to the Personnel Division and then create a new address line within the customer with TES' details.
VAT
All internal trading invoices do not attract VAT. The VAT code used must be INTERNAL.
Monitoring and further guidance
Reports on UFS
It is the responsibility of Heads of Departments and Department Administrators to monitor outstanding / unpaid Internal Trading invoices.
As part of month-end procedures for the Accounts Payable module, users are advised to :
-
Run the 'Invoice Register' report for uncompleted invoices. Ensure that there are no invoices remaining on the default transaction code FKAA waiting re-coding to the correct departmental account.
-
Run the 'Invoices on Hold' report. Internal invoices on hold must be investigated and resolved. Guidance and mediation are available from the Finance Division.
Year end
The Finance Division produce detailed year-end procedures which include the processing and resolving of Internal Trading invoices. Further information is available in the Year End Guidance pages of the Financial Procedures Manual.
Heads of Institution are required to confirm compliance with these procedures in their year-end certificate.
Further guidance and support
| For further guidance on... | ||
|---|---|---|
| raising internal trading sales transactions | AR Helpdesk |
(3)32215 |
| locating and processing internal trading payable invoices | AP Helpdesk |
(7)66888 |
| raising purchase orders | iProc Helpdesk |
(7)65101 |
| queries or concerns regarding the validity of a supply | School Finance Advisor or NSI FInance Manager | |
| general Internal Trading processes | Head of Accounting Services | |
Customer numbers for internal departments
A list of customer numbers for internal departments can be found under "Department Contacts"
Invoicing sub-departments
To invoice departments that are sub-ledgers of another department, an additional address line will need to be created in the original customer record. For example to invoice CamSIS
- go to Customer number 1000 (Central Admin)
- create a new address line with CamSIS's details
- The location field of the BILL TO USAGE should include your department code followed by the word CamSIS (eg. AG_Camsis)
Invoicing Physics
When departments deal with any of the sub-ledgers of PHYSICS (Department code KA- KN) they should ensure that:
- purchase orders to Physics are all addressed to department code KA
- purchase invoices from Physics will appear in the customer's AP module as supplier PHYSICS (KA)
- sales invoices to Physics are addressed to the appropriate sub-ledger eg. KB_KN
Version history
| Version number | Issue date | Comments |
|---|---|---|
| 2.4 | 14 Jan 2026 | Consolidated introduction, monitoring and appendix pages onto this one. |
| 2.3 | 12 Dec 2025 |
Minor formatting changes to improve readability, updating of links and contacts throughout. Para 1.2: updated organisations included in the University VAT Group Section 2 renamed: Buying from other Departments Para 2.1 Ordering: iProcurement: departments must provide written instructions and authorisation to the supplying department. The need for segregation of duties where individuals work in more than one department. Para 2.2.1 Actions required in AP: addition of default coding used for interfaced invoices, the need to recode these to the correct departmental account or project before validating and SIA. Para 3.1 Pre-sale internal controls – new para. Before making any supplies to another department written authorisation or a PO required, you must confirm that it is a genuine supply, costs are eligible for recharge and supporting documents are provided. Internal invoices over £50,000 will require Head of Institution approval. Para 3.3 Approval of sales invoices – new para. Including requirement for the authoriser to be separate from the invoice requester and the invoice preparer. |
| 2.2 | 17 Jan 2020 | New section added: 3.2.1 Sending an invoice |
| 2.1 | 4 Nov 2019 |
Removed Appendix A and references to it Added Internal Trading Flow Chart Updated links to new finance division webpage Update to reflect internal trading bursting |
| 2.0 | 25 Feb 2019 | Converted to new format, links checked. Updated to reflect the bursting of the AR invoices to the recipient departments. |