INTERNAL AND INTERNATIONAL MIGRATION - Immigrants, Emigrants, Migration increase, Internal migration and International migration| Contact |
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| Contact organisation | National Statistical Institute |
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| Contact organisation unit | Population and Housing Fund Statistics Department |
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| Contact name | Chrastina Petkova-Tancheva |
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| Contact person function | Head of Population and Housing Fund Statistics Department |
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| Contact mail address | 2, P. Volov Str.; 1038 Sofia, Bulgaria |
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| Contact email address | [email protected] |
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| Contact phone number | +359 2 9857 553 |
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| Contact fax number |
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| Metadata update |
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| Metadata last certified | 29 April 2026 |
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| Metadata last posted | 29 April 2026 |
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| Metadata last update | 29 April 2026 |
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| Statistical presentation |
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| Data description | Persons who have changed their usual residence (current address) are surveyed. The registration is done at the moment of migration and the total migration is calculated as of 31.12 of the reference year. Internal migration is the change of usual residence within the country and international - the change of usual residence in Bulgaria with a residence abroad or vice versa. Migration growth of a given country territory is the difference between the immigration to and emigration from the area during the year. |
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| Classification system | · Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS); · Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU); · Classification of countries (for the international migration purposes only). |
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| Sector coverage | Data on migration concerns a calendar year and include all persons who have changed their current address within the country, address in the country with an address abroad and address abroad with an address in the country. |
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| Statistical concepts and definitions | Migration growth of a given country territory is the difference between the immigration to and emigration from the area during the year. Net international migration is the difference between immigration into and emigration from the country. |
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| Statistical unit | Migrated persons |
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| Statistical population | Migrants - total number |
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| Reference area | Regional breakdown of migrants is done according to the country administrative-territorial division as of 31.12 of the reference year - settlements, municipalities, districts and statistical regions. |
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| Time coverage | On the NSI website · 2010 - 2025 internal migration; · 2010 - 2025 international migration. |
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| Base period | Not applicable. |
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| Unit of measure |
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Number; per 1000 population |
| Reference period |
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Calendar year |
| Institutional mandate |
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| Legal acts and other agreements | · Regulation (EU) 2020/851 of the European Parliament and of the Council amending Regulation (EC) No 862/2007 on Community statistics on migration and international protection; · Law on Statistics; · Law on Civil Registration. |
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| Data sharing | Data is presented based on Regulation (EU) 2020/851 of the European Parliament and of the Council amending Regulation (EC) No 862/2007 on Community statistics on migration and international protection. |
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| Confidentiality |
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| Confidentiality - policy | · Law on Statistics · Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society. |
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| Confidentiality - data treatment | Individual data are not published in accordance with article 25 of the Law on Statistics. The publishing of individual data can be performed only in accordance with article 26 of the same law. |
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| Release policy |
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| Release calendar | Information is published annually according to the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute. |
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| Release calendar access | The calendar is available on the NSI website: http://www.nsi.bg/en/node/480 |
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| User access | Data is published on the NSI website, section Population (Demography, Migration and Projections) in accordance with the Law on Statistics and the European Statistics Code of Practice respecting the professional independence and aimed at objectivity, transparency and equal treatment of all consumers. |
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| Frequency of dissemination |
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Annually |
| Accessibility and clarity |
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| News release | News release "Population and demographic processes". |
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| Publications | · Population and demographic processes; · Statistical Reference book; · Statistical Yearbook. |
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| On-line database | Data on migration are available to all users of the NSI website under the heading Population (Demography, Migration and Projections) - Migration: http://www.nsi.bg/en/node/6683 Information System INFOSTAT Internal migration: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=32 International migration: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=38 |
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| Micro-data access | Anonymised individual data can be provide for scientific and research purposes, and for individual request according to the Rules for the provision of anonymised individual data for scientific and research purposes. |
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| Other | Information service on request, according to the Rules for the dissemination of statistical products and services in NSI. |
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| Documentation on methodology | · Methodology on migration: http://www.nsi.bg/sites/default/files/files/metadata/Pop_5_Metodology_migration_en.pdf; · Manual for functioning of the Unified System for Civil registration and Administrative Service of Population. |
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| Quality documentation | Not available. |
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| Quality management |
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| Quality assurance | Not applicable. |
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| Quality assessment | Not applicable. |
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| Relevance |
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| User needs | Data on migration are presented annually to the Eurostat and others - questionnaires filled in annually. At national and regional level the main data users are ministries, agencies, national organisations and local authorities. Data is presented to scientific institutes, universities, NGOs and others based on requests. |
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| User satisfaction | No user' satisfaction surveys are carried out. |
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| Completeness | Population data is available by sex, ages (different groupings) residence (different territorial levels), citizenship and country of birth. |
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| Accuracy and reliability |
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| Overall accuracy | Not applicable. |
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| Sampling error | Not applicable. |
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| Non-sampling error | Not applicable. |
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| Timeliness and punctuality |
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| Timeliness | Data are published up to the end of April in the year following the reference year. |
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| Punctuality | Data is released according to the terms. |
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| Coherence and comparability |
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| Comparability - geographical | Data is collected and processed for the different territorial units using one and the same methodology and definitions. |
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| Comparability - over time | Changes of the methodology and definitions for different time periods are published in the survey methodology. |
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| Coherence - cross domain | Not applicable. |
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| Coherence - internal | Not applicable. |
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| Cost and burden |
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Not applicable. |
| Data revision |
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| Data revision - policy | Not applicable. |
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| Data revision - practice | Not applicable. |
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| Statistical processing |
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| Source data | · Source of data on migrants is the Unified System for Civil registration and Administrative Service of Population. Migration is registered through a common USCRASP-CDS document "Change of current address"; · Source of data on permanently staying foreigners is the Register of foreigners, Ministry of Interior; · Source of data on Bulgarians leaving the country - National Revenue Agency, declaration on refusal of health insurance rights due to absence from the country; National Social Security Institute |
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| Frequency of data collection | · Monthly for USCRASP data; · Annually- for NRA, MI and NSSI data. |
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| Data collection | Exhaustively for all migrations registered during the year. |
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| Data validation | Data on demographic events is checked and controlled before to be loaded in the IS Demography. For successful processing, the initial notification should meet the system rules on validation and control. The processed results are validated in respect the consistency of a single table and between the tables. |
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| Data compilation | Data is processed by the IS "Demography" according to the rules for validation and control of the demographic events. |
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| Adjustment | Not applicable. |
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| Comment |
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