ap0258

RI = NI - rB_t-1 So Net Income - cost of equity*last years book value

EP = NOPAT -$WACC

NOPAT is EBIT(1-t). EBIT(1-t) should equal NI.. as long as there is no interest charges on the income statement. If there are, then your calc should be EP = EBT(1-t) - $WACC

note ($WACC = D+E * WACC) which is the weighted average cost of debt (reduced by tax rate), preferred debt (maybe - but not reduced by tax rate) and equity (drived from CAPM).