2. States concerned shall take appropriate measures to facilitate such transfers. Article 48 1. Without prejudice to applicable double taxation agreements, migrant workers and members of their families shall, in the matter of earnings in the State of employment: (a) Not be liable to taxes, duties or charges of any description higher or more onerous than those imposed on nationals in similar circumstances; (b) Be entitled to deductions or exemptions from taxes of any description and to any tax allowances applicable to nationals in similar circumstances, including tax allowances for dependent members of their families. 2. States Parties shall endeavour to adopt appropriate measures to avoid double taxation of the earnings and savings of migrant workers and members of their families. Article 49 1. Where separate authorizations to reside and to engage in employment are required by national legislation, the States of employment shall issue to migrant workers authorization of residence for at least the same period of time as their authorization to engage in remunerated activity. 2. Migrant workers who in the State of employment are allowed freely to choose their remunerated activity shall neither be regarded as in an irregular situation nor shall they lose their authorization of residence by the mere fact of the termination of their remunerated activity prior to the expiration of their work permits or similar authorizations. 3. In order to allow migrant workers referred to in paragraph 2 of the present article sufficient time to find alternative remunerated activities, the authorization of residence shall not be withdrawn at least for a period corresponding to that during which they may be entitled to unemployment benefits. 127