Canonical Impediments to Marriage: Dispensations and Convalidation

Canonical impediments to marriage are the twelve legal barriers in the 1983 Code of Canon Law that make a Catholic wedding invalid unless a formal dispensation removes them beforehand. When one of these impediments exists and no dispensation has been granted, the marriage is null from the start, regardless of whether the couple or the officiant knew about the problem. A separate, smaller category of prohibitory impediments makes a marriage unlawful but still technically valid.

Age, Impotence, and a Prior Marriage Bond

Canon 1083 sets the minimum age for a valid Catholic marriage at sixteen for men and fourteen for women.¹ These are the universal Church minimums. Many dioceses and national bishops’ conferences set the practical threshold higher to match local civil law, and most parishes will not schedule a wedding for anyone under eighteen without additional permissions. But as a matter of pure validity, the canon draws the line at sixteen and fourteen.

Canon 1084 makes antecedent and perpetual impotence a diriment impediment. Both words matter. The inability to complete the marital act must have existed before the wedding and must be incurable by ordinary medical means. If either condition is missing, the impediment does not apply. The canon explicitly adds that sterility neither prohibits nor invalidates a marriage.¹ A couple who cannot conceive can still marry validly; a person who physically cannot complete the conjugal act cannot.

Canon 1085 prevents anyone already bound by a valid marriage from entering another one, even if the first marriage was never consummated.¹ A civil divorce has no canonical effect on the bond. The Church treats the prior union as intact until one of two things happens: the former spouse dies and that death is proven, or a Church tribunal issues a formal decree of nullity establishing that the prior marriage was invalid from the beginning. Even where the prior marriage clearly appears invalid, the canon requires nullity to be established “lawfully and with certainty” before a new marriage can proceed.

Sacred Orders and Religious Vows

Canon 1087 bars anyone who has received sacred orders from validly marrying. This covers deacons, priests, and bishops. Canon 1088 does the same for anyone who has taken a public perpetual vow of chastity in a religious institute.¹ The logic behind both is the same: these individuals have already made a lifelong commitment the Church views as incompatible with the obligations of marriage. Dispensation from either is reserved to the Apostolic See in Rome, not the local bishop, which makes these among the hardest barriers to remove.

Disparity of Cult

Canon 1086 addresses disparity of cult, the impediment that arises when a baptized Catholic wants to marry someone who has never been baptized. Without a dispensation from the local bishop, the marriage is invalid.¹

Note the boundary here. A marriage between a Catholic and a baptized non-Catholic, such as a Lutheran or an Orthodox Christian, is a different situation. Canon 1124 treats it as a prohibitory impediment: the marriage cannot be celebrated without the express permission of the local bishop, but if the couple goes ahead without permission, the marriage is illicit rather than invalid.¹ An illicit marriage is a rule violation that may carry consequences, but the union itself still stands. A marriage attempted under a diriment impediment is simply void.

Abduction and Conjugicide

Two impediments target criminal behavior that undermines the free consent marriage requires. Canon 1089 invalidates any marriage between a man and a woman he has abducted or detained for the purpose of marrying her. The impediment lasts as long as the woman remains in the abductor’s power; only after she is separated from the captor and placed in a safe, free location can she choose to marry him of her own accord.¹ The canon’s language is gendered, applying specifically to the abduction of a woman by a man.

Canon 1090 covers conjugicide, killing a spouse to clear the way for a new marriage. The impediment applies in two scenarios. If someone causes the death of their own spouse or the spouse of the person they intend to marry, the attempted marriage is invalid. It also applies when both parties cooperated, physically or by encouragement, in bringing about the death.¹ Dispensation is reserved to the Apostolic See, and in practice it is almost never granted.

Family and Legal Relationships

The final four impediments protect the integrity of family bonds by prohibiting marriages between people who are too closely related by blood, legal connection, or prior intimate relationships.

Consanguinity (Canon 1091) makes marriage always invalid between ancestors and descendants in the direct line: parents and children, grandparents and grandchildren, and so on with no limit. In the collateral line, marriage is invalid through the fourth degree, which under the canonical counting system includes first cousins.¹ Consanguinity in the direct line and in the second degree of the collateral line (siblings) is never dispensed under any circumstances.

Affinity (Canon 1092) is the relationship that arises through marriage between one spouse and the blood relatives of the other. The impediment invalidates marriage only in the direct line: a person cannot marry the parent, grandparent, child, or grandchild of a former spouse.¹ It does not extend to the collateral line, so marrying a former spouse’s sibling is not blocked by this canon.

Public propriety (Canon 1093) arises from either an invalid marriage where the couple established a common life, or from a well-known cohabiting relationship. It blocks marriage between the man and the first-degree direct-line blood relatives of the woman, and vice versa.¹ In plain terms, if a man lived with a woman in a publicly known relationship, he cannot validly marry her mother or daughter without a dispensation.

Legal relationship from adoption (Canon 1094) treats the kinship created by adoption much like blood kinship for marriage purposes. It bars marriage in the direct line (adoptive parent and adopted child) and in the second degree of the collateral line (adopted siblings).¹

Who Can Dispense Which Impediment

Not all impediments are equal in how difficult they are to remove. Canon 1078 sets the general rule: the local bishop can dispense from any impediment of ecclesiastical law unless the dispensation is specifically reserved to Rome.¹ That covers most dispensations, including those for disparity of cult, age, consanguinity in the third and fourth collateral degrees, affinity, public propriety, and adoption. All go through the diocesan chancery and can be resolved locally.

Three impediments are reserved to the Apostolic See:

Sacred orders under Canon 1087: only Rome can dispense a deacon, priest, or bishop from the obligation preventing marriage.
Public perpetual vow in a religious institute of pontifical right under Canon 1088: vows taken in an institute answerable directly to Rome require Rome’s dispensation.
Conjugicide under Canon 1090: the gravity of the underlying act places this outside any local bishop’s authority.

One impediment can never be dispensed at all. Canon 1078 §3 states that no dispensation is ever granted from consanguinity in the direct line or in the second degree of the collateral line.¹ A parent and child, or two siblings, can never receive a dispensation to marry.

Emergency Dispensation in Danger of Death

Canon 1079 carves out an exception. When one of the parties is in danger of death, the local bishop can dispense from every impediment of ecclesiastical law except sacred orders at the rank of priest or above. If even the bishop cannot be reached in time, the pastor or the priest or deacon assisting at the marriage has the same dispensing power. A confessor can also dispense from hidden impediments in the internal forum during confession.¹

How to Request a Dispensation

The process begins at the parish. During marriage preparation, the priest or deacon identifies whether any impediment exists and gathers the documentation needed to support the request. Depending on the impediment, that typically includes a recent baptismal certificate (many dioceses require one issued within six months), witness statements confirming that no prior marriage bond exists, a death certificate or decree of nullity when a prior marriage is involved, medical documentation where relevant, and a written statement of just cause explaining why the dispensation is warranted.

The parish priest reviews the completed file and transmits the request to the diocesan chancery, which acts on behalf of the bishop. For impediments reserved to the Apostolic See, the chancery forwards the petition to Rome. If the dispensation is granted, a formal written document called a rescript is issued.² The rescript is kept with the marriage record as proof that the barrier was validly removed before the wedding. Processing times at the diocesan level typically run four to six weeks, so couples should plan accordingly.

What Happens If You Marry Despite an Impediment

If a diriment impediment exists and no dispensation was obtained, the marriage is canonically null. It does not matter whether the couple or the officiant knew about the impediment at the time. Nullity is not a punishment; it is a legal conclusion that the marriage never came into existence as a sacramental bond.

The consequences extend beyond the marriage itself. Catholics in an irregular marriage situation who are unwilling to resolve it are considered to be obstinately persisting in manifest grave sin under Canon 915, which means they are not to be admitted to Holy Communion.³ The restriction applies for as long as the situation remains unresolved. The Church encourages such couples to regularize their marriage through one of the two processes below.

Fixing an Invalid Marriage: Convalidation and Radical Sanation

When a marriage turns out to be invalid because of an undispensed impediment, the Church offers two paths to fix it rather than simply declaring the union void.

Simple Convalidation

Canon 1156 requires that the impediment first cease to exist or be dispensed, and then that at least the party who is aware of the impediment give a new act of consent.¹ The renewal of consent is not a formality. It must be a genuine new act of will directed at a marriage the person knows or believes was null from the beginning. If the impediment was publicly known, both parties must renew consent in canonical form, which typically means a ceremony before a priest and witnesses. If it was hidden, the aware party can renew consent privately. The process involves standard marriage preparation steps including a prenuptial investigation, and practices vary from diocese to diocese.

Radical Sanation

Canon 1161 provides an alternative called radical sanation (sanatio in radice). This is a convalidation granted by the competent authority without requiring the parties to renew their consent. It includes a dispensation from whatever impediment existed, a dispensation from canonical form if it was not observed, and a retroactive grant of canonical effects reaching back to the moment the original ceremony took place.¹ The retroactivity is what makes this remedy “radical” in the canonical sense: it treats the marriage as having been valid from the wedding day forward.

A radical sanation is typically used when a simple convalidation would be impractical or harmful. Common scenarios include cases where one party refuses to participate in a new ceremony, where revealing the invalidity would cause serious scandal or psychological distress, or where the couple does not fully understand what a convalidation requires. The key prerequisite is that both parties originally gave genuine matrimonial consent and that consent still persists. If the original consent itself was defective, a radical sanation cannot fix the problem because there is nothing to retroactively validate. The petition goes through the diocesan chancery to the bishop, and if granted, the sanation is recorded in the parish marriage register and the baptismal register of the Catholic party.

1
Vatican. Code of Canon Law – Book IV – Function of the Church
2
Vatican. Code of Canon Law – Book I – General Norms
3
United States Conference of Catholic Bishops. Annulment