§1. Since clerics dedicate themselves to ecclesiastical ministry, they deserve remuneration which is consistent with their condition, taking into account the nature of their function and the conditions of places and times, and by which they can provide for the necessities of their life as well as for the equitable payment of those whose services they need.
§2. Provision must also be made so that they possess that social assistance which provides for their needs suitably if they suffer from illness, incapacity, or old age.
§3. Married deacons who devote themselves completely to ecclesiastical ministry deserve remuneration by which they are able to provide for the support of themselves and their families. Those who receive remuneration by reason of a civil profession which they exercise or have exercised, however, are to take care of the needs of themselves and their families from the income derived from it.
Source: Code of Canon Law (Vatican.va)