Between June 2024 and June 2025, about 6,000 Poles arrived in the UK, while around 25,000 left, resulting in a net migration figure of minus 19,000.
The institute says this reflects a wider trend of growing emigration from the UK among EU citizens.
Over the same period, net migration from the European Union stood at minus 70,000, compared with minus 61,000 a year earlier.
Since June 2020, the number of Poles living in the UK has fallen by about 70,000 as a result of migration, although the data does not show whether those leaving returned to Poland or moved elsewhere.
The decline follows a longer-term shift that began after the Brexit referendum in 2016. Net EU migration to the UK turned negative in 2022 and has continued to fall since.
In the year to June 2025, negative net migration was also recorded for citizens of Romania, Italy, Spain and Bulgaria.
At the same time, overall long-term net migration to the UK remained positive at 204,000, driven by strong inflows from outside the EU, particularly from India, Pakistan and China.
According to census data from 2021 and 2022, around 804,000 Poles were living in the UK.
The Polish Economic Institute estimates that the figure has now fallen to about 738,000, with most Polish migrants having arrived after Poland joined the EU in 2004.
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Source: PEI/X/@PIE_NET_PL