"The importance of the cross‐border portability of social benefits is increasing in parallel with the rise in the absolute number of international migrants and their share of the world population, and perhaps more importantly with the much higher and rising share of the world population that for some part of their life is working and/or retiring abroad. This article estimates how the rising stock of migrants is distributed over four key portability regimes ranging from portability through bilateral social security arrangements to undocumented workers with no access to any scheme. The comparison of estimates for 2000 and 2013 indicate a modest but noticeable increase in the share of migrants under regime I (full portability) by 1.4 per cent, but the biggest change occurred under regime III (no access to social security but also no contributions required), which almost doubled to 9.4 per cent. Regime II (potential exportability without totalization) reduced by 3.0 percentage points but remains the dominant scheme (at 53.2 per cent). The estimates suggest that the scope of regime IV (informality) reduced by 2.9 percentage points, accounting for 14.0 per cent of all migrants in 2013. This trend is positive, but more will need to be done to progress on benefit portability and various potential solutions lie outside bilateral agreements that are difficult to establish."

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