Article 39 of the Revised Penal Code: Subsidiary imprisonment

If the convict has no property with which to meet the fine mentioned in paragraph 3 of the next preceding article, he shall be subject to a subsidiary personal liability at the rate of one day for each amount equivalent to the highest minimum wage rate prevailing in the Philippines at the time of the rendition of judgment of conviction by the trial court, subject to the following rules: 1. If the principal penalty imposed be prision correccional or arresto and fine, he shall remain under confinement until his fine referred in the preceding paragraph is satisfied, but his subsidiary imprisonment shall not exceed one-third of the term of the sentence, and in no case shall it continue for more than one year, and no fraction or part of a day shall be counted against the prisoner. 2. When the principal penalty imposed be only a fine, the subsidiary imprisonment shall not exceed six months, if the culprit shall have been prosecuted for a grave or less grave felony, and shall not exceed fifteen days, if for a fight felony. 3. When the principal penalty imposed is higher than prision correccional, no subsidiary imprisonment shall be imposed upon the culprit. 4. If the principal penalty imposed is not to be executed by confinement in a penal institution, but such penalty is of fixed duration, the convict, during the period of time established in the preceding rules, shall continue to suffer the same deprivations as those of which the principal penalty consists. 5. The subsidiary personal liability which the convict may have suffered by reason of his insolvency shall not relieve him from the fine in case his financial circumstances should improve.