l reproduce a post I published some time ago, amended to reflect recent updates:
There is no such thing as a common-law marriage in the Dominican Republic. As our Supreme Court has repeatedly stated, merely living together is never equivalent to a formal, legally recognized marriage.
However, on October 17, 2001, the Supreme Court issued a ruling that granted a surviving concubine the right to sue for the wrongful death of her partner in a car accident—albeit under very restrictive conditions:
a) The couple must have lived together publicly as husband and wife, not in secrecy;
b) The relationship must have been stable and long-lasting;
c) It must have been monogamous and non-adulterous from the outset; and
d) The partners must have been of different sexes.
In the years that followed, Dominican courts gradually extended these rights to include recognition of claims over the estate of a deceased partner or the granting of certain property rights upon separation.
Notably, Article 55.5 of the Dominican Constitution now expressly states:
“The unique and stable union between a man and a woman, without legal impediments to marriage, forms a de facto family and creates rights and duties in their personal relations and concerning their property, in accordance with the law.”
There is no statutory minimum duration of cohabitation required to establish a stable union; it is up to the courts to assess the existence and nature of the relationship based on the facts of each case.
That said, if legal certainty is the goal, the safest course of action remains a formal marriage with a prenuptial agreement.