This paper analyzes revenue-neutral tax reforms for a small open economy wh
ich is constrained to a balanced current account and whose producers have m
arker power on the world market. We consider origin-based and destination-b
ased commodity taxes as well as taxes on income. the payroll, and on an imp
orted factor of production. Our main findings are the following. First, the
strength. and for some parameter constellations, even the sign of the empl
oyment effect of tax reforms varies with the degree of openness of the econ
omy. Second. the indeterminacy of the sign of the employment effect crucial
ly hinges on the presence of an internationally mobile factor. The central
mechanism underlying our results are adjustments of the real exchange rate
which have repercussions on wage and price setting and therefore on employm
ent.