• a long-term international migrant is defined as someone who changes his or her country of usual residence for a period of at least a year

  • primarily based on a subset of the International Passenger Survey (IPS)

  • provisional estimates are published quarterly, 5 months after the reference period, and final estimates for the previous calendar year published annually in November

  • formerly known as Total International Migration (TIM)

Long-term international migration (LTIM) statistics estimate the flow and characteristics of migrants to and from the UK.

Statistics on international migration are available for a number of variables including citizenship, country of last or next residence, country of birth, age, sex, marital status, main reason for migration, usual occupation, and area of destination or origin within the UK.

In order to produce international migration estimates, it is necessary to use a combination of survey and administrative sources. Estimates are primarily based on the International Passenger Survey (IPS) but are supplemented by Home Office administrative data, the Quarterly National Household Survey and data from the Northern Ireland Statistics and Research Agency (NISRA).

There is significant interest in migration statistics both nationally and internationally, with the need to understand how migration impacts society and the economy. As such, there are a number of important users of these statistics.

International migration is also an important component of population change and is used in the production of population estimates and population projections.

We quality assure the administrative data used for these statistics to ensure that they are suitable for this purpose. To gain further insight on data quality issues and the impact on statistics, please see Quality Assurance of Administrative Data:

Download this methodology

Contact details for this Quality and methodology information