The head of the IMF, Christine Lagarde, presented a report at the Davos World Economic Forum. The report clarifies that the fiscal relaxation should only be allowed after the various countries have presented clear and precise evidence of the amounts which they have been forced to spend due to the migration crisis.

Regarding the influx of migrants in Europe, the report claims that they will produce an increase in the GNP of the various welcoming countries  but this will only be slight. The main reason for the increase will be due to the fact that countries will have to increase their spending in order to create the conditions needed for the accommodation of the migrant's needs, a fact which will lead to the increase of demand and spending.

For Greece, the IMF estimated that the cost of the migration crisis will be around 0,17% of the GNP (aprox. 300ml euros).

The biggest fiscal cost for 2015 was for Sweden (0,5 of GNP) and Denmark (0,47%) wheres Germany and Italy faced a 0,20 increase with Holland having a 0,18% and Spain just 0.006% of its GNP.

The report does mention Greece in a specific manner yet it  says that every country should be separately reviewed since countries of entrance might be facing different challenges form countries of settlement.
 

IMF Report