The immigrants' age structure and labour market situation are major determi
nants for their net contribution to the public sector. During the 50s, 60s
and the 70s the immigrants' net contributions gave positive income effects
for the native Swedes. Nowadays there are negative income effects due to th
e deteriorating employment situation among the immigrants. The yearly posit
ive or negative income effects have at most been 1-2% of the gross national
product. A change in the immigrants' employment rate by 1 percentage unit
will change their yearly net contribution to the public sector by 0.1% of t
he gross national product. JEL classification: F22, J15, H5.