We use a Capital Asset Price Model (CAPM) model to derive the formula of user cost for foreign monetary asset whose rates of return are subject to foreign exchange risk premia. Our formula shows that only domestic non-monetary asset can be used as the benchmark asset. In fact, under dollarization the local currency’ assets offer a higher risk premium and return over the dollar denominated one because the latter is preferred over the first for hedging motives. Using data from Chile (from June 2003 to January 2022) and Croatia (from December 2011 to March 2022), our results show that the inclusion of the currency risk premium has improved substantially the formula proposed by Barnett (1978).