P45 Document Serial Number

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The serial number changes in increments of one each time a form is submitted (e.g., if starting serial number is 10000, the next form submission will have a serial number of 10001). To setup a serial number PDF, you will need a fillable PDF form configured with a web form (see how to create fillable PDF forms). A P45 has 4 parts (Part 1, Part 1A, Part 2 and Part 3). Your employer sends details for Part 1 to HM Revenue and Customs (HMRC) and gives you the other parts. You give Part 2 and 3 to your new employer (or to Jobcentre Plus if you’re not working).

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Serial number from an identity document
Serial number on a semi-automatic pistol
Serial number of a laptop computer

A serial number is a unique identifier assigned incrementally or sequentially to an item, to uniquely identify it.

Serial numbers need not be strictly numerical. They may contain letters and other typographical symbols, or may consist entirely of a characterstring.

  • 1Applications of serial numbering
  • 2Other uses of the term

Applications of serial numbering[edit]

Further information: Numbering scheme

Serial numbers identify otherwise identical individual units with many, obvious uses. Serial numbers are a deterrent against theft and counterfeit products, as they can be recorded, and stolen or otherwise irregular goods can be identified. Some items with serial numbers are automobiles, electronics, and appliances. Banknotes and other transferable documents of value bear serial numbers to assist in preventing counterfeiting and tracing stolen ones.

They are valuable in quality control, as once a defect is found in the production of a particular batch of product, the serial number will identify which units are affected.

Serial numbers for intangible goods[edit]

Document Serial Number

Serial numbers may be used to identify individual physical or intangible objects (for example computer software or the right to play an online multiplayer game). The purpose and application is different. A software serial number, otherwise called product key, is usually not embedded in the software, but is assigned to a specific user with a right to use the software. The software will function only if a potential user enters a valid product code. The vast majority of possible codes are rejected by the software. If an unauthorised user is found to be using the software, the legitimate user can be identified from the code. It is usually not impossible, however, for an unauthorised user to create a valid but unallocated code either by trying many possible codes, or reverse engineering the software; use of unallocated codes can be monitored if the software makes an Internet connection.


Other uses of the term[edit]

The term serial number is sometimes used for codes which do not identify a single instance of something. For example, the International Standard Serial Number or ISSN used on magazines, journals and other periodicals, an equivalent to the International Standard Book Number (ISBN) applied to books, is assigned to each periodical. It takes its name from the library science use of the word serial to mean a periodical.

Certificates and certificate authorities (CA) are necessary for widespread use of cryptography. These depend on applying mathematically rigorous serial numbers and serial number arithmetic, again not identifying a single instance of the content being protected.

The RAF serial (XG900) on the Short SC.1

Military and government use[edit]

The term serial number is also used in military formations as an alternative to the expression service number.[citation needed] In air forces, the serial number is used to uniquely identify individual aircraft and is usually painted on both sides of the aircraft fuselage, most often in the tail area, although in some cases the serial is painted on the side of the aircraft's fin/rudder(s). Because of this, the serial number is sometimes called a tail number.

Main article: United Kingdom military aircraft serials

In the UK Royal Air Force (RAF) the individual serial takes the form of two letters followed by three digits, e.g., BT308—the prototype Avro Lancaster, or XS903—an English Electric Lightning F.6 at one time based at RAF Binbrook.[1] During the Second World War RAF aircraft that were secret or carrying secret equipment had '/G' (for 'Guard') appended to the serial, denoting that the aircraft was to have an armed guard at all times while on the ground, e.g., LZ548/G—the prototype de Havilland Vampirejetfighter, or ML926/G—a de Havilland Mosquito XVI experimentally fitted with H2S radar. Prior to this scheme the RAF, and predecessor Royal Flying Corps (RFC), utilised a serial consisting of a letter followed by four figures, e.g., D8096—a Bristol F.2 Fighter currently owned by the Shuttleworth Collection, or K5054—the prototype Supermarine Spitfire. The serial number follows the aircraft throughout its period of service.

In 2009, the U.S. FDA published draft guidance for the pharmaceutical industry to use serial numbers on prescription drug packages.[2] This measure is intended to enhance the traceability of drugs and to help prevent counterfeiting.

Serial number arithmetic[edit]

Serial numbers are often used in network protocols. However, most sequence numbers in computer protocols are limited to a fixed number of bits, and will wrap around after a sufficiently many numbers have been allocated. Thus, recently allocated serial numbers may duplicate very old serial numbers, but not other recently allocated serial numbers. To avoid ambiguity with these non-unique numbers, RFC1982 'Serial Number Arithmetic', defines special rules for calculations involving these kinds of serial numbers.

Lollipop sequence number spaces are a more recent and sophisticated scheme for dealing with finite-sized sequence numbers in protocols.

See also[edit]

  • SQL (serial identifiers for databases)


  • Elz, R., and R. Bush, RFC1982 'Serial Number Arithmetic', Network Working Group, August 1996.
  • Plummer, William W. 'Sequence Number Arithmetic'. Cambridge, Massachusetts: Bolt Beranek and Newman, Inc., 21 September 1978.


  1. ^'British Aircraft Corporation Lightning F.Mk.6'. 1000aircraftphotos.com.
  2. ^Food and Drug Administration. 'Guidance for Industry Standards for Securing the Drug Supply Chain - Standardized Numerical Identification for Prescription Drug Packages Draft Guidance'. Archived from the original on 11 May 2009. Retrieved 19 April 2009.

External links[edit]

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P45 Document Serial Number

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