"Recent work on the fiscal impact of migration for all
European OECD countries, as well as Australia,
Canada and the United States, has provided new
and internationally comparative evidence (Liebig
and Mo, 2013). The study suggests the impact of
the cumulative waves of migration that arrived over
the past 50 years in OECD countries is on average
close to zero, rarely exceeding 0.5% of GDP in
either positive or negative terms. The impact is
highest in Switzerland and Luxembourg, where
immigrants provide an estimated net benefit of
about 2% of GDP to the public purse."
https://www.oecd.org/migration/OECD%20Migration%20Policy%20Debates%20Numero%202.pdf
