This paper analyzes the welfare effects of capital tax coordination in a si
mple model of fiscal competition where fiscal policy is subject to majority
voting and households differ with respect to their labor and capital incom
e. It turns out that a coordinated capital tax increase may raise or reduce
welfare, depending on the relative magnitude of i) economic distortions in
duced by a labor tax and ii) political distortions resulting from the influ
ence of the median voter on fiscal policy decisions. A negative welfare eff
ect is more likely, the smaller the marginal excess burden of the labor tax
and the smaller the ratio of the median voter's labor income to average la
bor income. We also use empirical estimates of the marginal excess burden o
f taxation to determine the welfare effects of tax coordination; it turns o
ut that a negative welfare effect of coordinated tax increases may emerge i
n our model for empirically reasonable parameters.