It is also established that for self-employed workers "the first advance payment of social security contributions is not due and the calculation of the second advance payment for the period of activity for the purpose of determining the advances due is made, on an extraordinary basis, with rates reduced to 50% based on the expected minimum income. " And again: " the payment of contributions , upon application to be submitted within the deadline set by the regulations in force to the competent offices of the Social Security Institute, may take place, in an extraordinary way, in installments, with reference to the period March-October 2020 ". The installment is without penalty but has an interest of 2%.