Known Donor Agreements, Explained

Educational guide · Not legal advice · Donor law is aggressively state-specific

A known donor agreement and a co-parenting agreement are opposites wearing similar clothes. A co-parenting agreement builds a shared-parenting structure; a known donor agreement builds a wall: its entire purpose is to establish that the person providing sperm (or eggs) is not a parent: no parental rights, no support obligations, no custody claims, in either direction. What some people call "known donor co-parenting" is usually a sign the roles were never actually separated. Using a friend as a donor without a real agreement, or using a donor agreement to paper over what's really co-parenting, are the two mistakes that generate most of the case law in this field.

What a known donor agreement covers

• Intent, stated relentlessly: the donor is a donor, not a parent. The document's core job is making that intent undeniable to a future court.
• No rights / no duties, both directions: the donor waives parental rights and the recipient waives support claims. One-directional agreements are a red flag for everyone.
• Contact and disclosure terms: whether the child can know the donor's identity, at what age, with what contact. "Open" arrangements are increasingly favored, as donor-conceived adults consistently report wanting access to their origins, but openness must be defined, not vibes.
• Health and genetic disclosure: current and future, a duty to disclose newly discovered heritable conditions.
• Confidentiality, future contact changes, and dispute process.

The physician-involvement trap

This is the single most consequential technicality in the field. Many state statutes derived from the Uniform Parentage Act extinguish a sperm donor's parental status only when the insemination is performed through a licensed physician (or, in updated versions, meets other formal requirements). In states with older statutes, a known donor for home insemination may be treated as a legal father, with support obligations and potential custody claims, regardless of what everyone signed. Courts in different states have gone different directions on this exact fact pattern.

The practical rules: know your state's statute before choosing home insemination; when in doubt, route through a clinic (the paper trail is itself protective); and never let "the clinic is expensive" reasoning make a five-figure legal problem out of a four-figure medical bill.

Donor agreement vs. co-parenting agreement

The failure mode in the last row deserves emphasis: conduct overrides paper. A donor who pays monthly "help," hosts regular overnights, and is called "dad" at school has built a parentage claim (or exposure) no matter how good the agreement was. Live the arrangement you signed. If the involvement you actually want looks parental, you want the co-parent path, so choose it honestly.

Process and cost

Both parties need independent attorneys, same as co-parenting agreements, and for the same ethics reasons. Typical cost is lower: often $800–$2,500 total for drafting plus review. Sequence is identical and non-negotiable: signed before any conception attempt. Post-conception donor agreements are dramatically weaker, because intent-at-conception is what courts examine. The toolkit includes a donor-arrangement appendix and the attorney interview script for finding counsel who has actually handled known-donor matters (the AAAA directory is the place to start).

Related: Donor vs. co-parent decision · Co-parenting agreements · Red flags