From the Article:
The Organization for Economic Cooperation and Development’s 2013 International Migration Outlook (via Michael Clemens) takes an in depth look at the fiscal impact of immigration on the 34 OECD member countries, finding “an overall fiscal impact in terms of GDP that is positive but small”:
Depending on the assumptions made and the methodology used, estimates of the fiscal impact of immigration vary, although in most countries it tends to be very small in terms of GDP and is around zero on average across the OECD countries considered. The impact, whether positive or negative, rarely exceeds 0.5% of GDP in a given year.
Read It Here: