Does a known donor become the legal father in the UK?

It depends entirely on the route. Through an HFEA-licensed clinic, no — the donor is not the legal parent. Through DIY/home insemination, yes — the donor is the legal father by default, regardless of any private agreement.

Can a known donor be forced to pay child support in the UK?

Only if he is the child's legal father — which happens automatically with DIY insemination, but not through a licensed clinic (assuming the correct consent forms were signed beforehand).

Is anonymous donation legal in the UK?

No — anonymous donation has been banned since April 2005. All clinic donors are registered with the HFEA, and donor-conceived people can request identifying information about their donor from age 18.

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Guide

Known Donor in the UK: Clinic vs DIY, Legal Parenthood & What to Expect

In the UK, whether a known donor becomes a legal parent depends entirely on the route: at an HFEA-licensed clinic, the donor is not the legal parent, and for a female couple the birth mother's partner becomes the second legal parent via signed consent forms completed before treatment — but via DIY/home insemination, the donor remains the child's legal father by default regardless of any private agreement, with the right to seek contact and the obligation to pay child support.

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Key facts

Clinic route (HFEA-licensed): the donor is not a legal parent. For a female couple, the birth mother signs Form WP and her partner signs Form PP before treatment begins — this is what makes the partner, not the donor, the second legal parent from birth.
DIY/home insemination route: none of the HFEA parenthood rules apply. The sperm donor is the child's legal father by default, whatever was privately agreed beforehand, and regardless of whether he intended a purely 'donor' role.
If a DIY donor is the legal father, he can apply for a Child Arrangements Order for contact or for parental responsibility, and can also be pursued for child support through the Child Maintenance Service — a known and serious risk of the DIY route that a private agreement cannot override.
A licensed donor's sperm or eggs can be used to create children in up to 10 families under HFEA rules (with no limit on the number of children within one family).
Anonymous donation has been banned since April 2005 — all clinic donors are registered with the HFEA, and donor-conceived people can request identifying information about their donor from age 18 (non-identifying and medical information is available from age 16).

Legal considerations

The choice between a licensed clinic and DIY insemination isn't just medical — it's the single biggest legal determinant of who ends up as the child's legal parent, so it needs to be a deliberate decision made before conception, not an afterthought.
A written donor or co-parenting agreement — not legally binding in itself in family court, but persuasive evidence of everyone's intentions — is standard practice regardless of route. Drafting one with independent legal advice on both sides typically costs £1,000–£3,000+VAT.
Family courts can and do look beyond a private agreement's label when disputes arise. Even a donor with no legal parenthood can apply to court for leave (permission) under section 10 of the Children Act 1989 to seek a Child Arrangements Order for contact, decided on the child's welfare — leave was granted in Re G; Re Z [2013] EWHC 134 (Fam), a landmark case for known donors, though outcomes vary: in MacDougall v SW & Ors [2022] EWFC 50, a donor's applications were refused and a barring order was made instead. What matters most is how involved a donor actually becomes in practice, not just what the agreement said.

Costs

Primarily legal costs: drafting and reviewing a donor or co-parenting agreement with independent legal advice for both sides typically runs £1,000–£3,000+VAT. Clinic treatment itself (IUI or IVF with a known donor) is a separate medical cost on top, and is not automatically NHS-funded — see the IVF guide for how UK fertility funding actually works.

Timeline

Weeks 1–4: initial conversations about the route (clinic vs DIY), expectations, involvement level, and contact.
Weeks 4–12: draft and sign a donor or co-parenting agreement with independent legal advice on both sides.
Before any procedure: if using a licensed clinic with a female couple, Forms WP and PP must be signed before treatment begins — this cannot be done retroactively.

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