Adult adoption is legal in all 50 states, and getting adopted after 18 is far simpler than being adopted as a child. Both parties sign on, a judge reviews the petition at a short hearing, and the court issues a decree that creates a permanent legal parent-child relationship. Once the decree is signed, the adopted adult can inherit from the adoptive parent under state law, take the adoptive parent’s surname, and receive a new birth certificate naming the adoptive parent as the parent of record.
Why People Choose Adult Adoption
The most common reason is putting a legal frame around a bond that already exists. A stepparent who raised someone from childhood, a foster parent whose relationship kept going long after the case closed, a grandparent or aunt who stepped in when a biological parent could not — those relationships are real, but they carry no legal weight until a court says so.
Inheritance drives many of the rest. If someone dies without a will, state intestacy laws direct the estate to legal relatives. A person with no legal tie has no claim, no matter how close the relationship was. Adoption places the adopted adult in the same position as a biological child for inheritance.
Some families use adult adoption to build a stable legal structure around caring for an adult with a disability. The adoption itself does not grant decision-making authority over a competent adult, but it establishes the parent-child relationship that makes guardianship, conservatorship, or power of attorney arrangements more coherent over the long term.
Who Can Be Adopted as an Adult
The adopting parent has to be older than the adoptee. Some states go further and require a minimum age gap, often around ten years, though the exact number varies. Residency rules also apply in many states: usually the adopting parent or the adoptee has to live in the state where the petition is filed.
A handful of states restrict who can be adopted. Some prohibit adopting a spouse or romantic partner on the reasoning that a sexual relationship is not compatible with a parent-child relationship. Others have refused to approve adoptions between unmarried partners when a court concluded the real purpose was to manipulate a trust or estate rather than form a family.
Consent
Both the adopting parent and the adoptee have to agree in writing. If either is married, spousal consent is generally required as well, because adoption changes inheritance rights and family obligations that a spouse has a direct stake in.
The adoptee’s biological parents do not need to consent. The adoptee is a legal adult and makes the choice independently. Some states require that biological parents receive formal notice of the proceeding, but notice is not consent. The adoption moves forward whether the biological parents approve or not.
Filing the Petition
The process starts with paperwork. You prepare a Petition for Adult Adoption and an Adoption Agreement, both usually available from the county court clerk’s office or the court’s website. The forms ask for the full legal names, addresses, and dates of birth of both parties, plus a statement of why the adoption is being sought.
Supporting documents typically include certified copies of birth certificates for both parties and marriage certificates for anyone married. Signed consent forms from the adoptee, the adopting parent, and their spouses complete the file.
You file with the court in the county where the adopting parent lives and pay a filing fee. Fees vary by jurisdiction but generally range from under $100 to a few hundred dollars. Attorney fees, if you hire one, add to the total. Many people handle adult adoptions without a lawyer because the process is much lighter than a child adoption: no home study, no background check, no investigation into parental fitness. The court’s review is shorter because both parties are consenting adults.
The Court Hearing
After filing, the court schedules a hearing. Both parties have to appear. The hearing is usually brief. The judge confirms that both people consent freely, understand what the adoption means legally, and are not pursuing it for fraudulent purposes. The judge may ask a few questions about the relationship and the reason for the adoption.
If everything checks out, the judge signs an Adoption Decree. That order is what makes the adoption final. The legal parent-child relationship exists from that point on.
How Inheritance Rights Change
The biggest legal consequence is the shift in inheritance. The adopted adult gains the right to inherit from the adoptive parent under intestacy laws, and the adoptive parent gains the right to inherit from the adoptee. It works the same as inheritance between a biological parent and child.
The other side of that shift is that adoption typically cuts off the adoptee’s inheritance rights from their biological parents. For intestacy purposes, the decree replaces the biological parents with the adoptive parent. The severance can run through generations. If the adoptee’s biological parent later dies without a will, the adoptee and the adoptee’s own children may have no legal claim to that estate. Courts have enforced this even when the adoption happened late in life, reasoning that the legal break from the biological family is complete regardless of the adoptee’s age.
This is where people are sometimes caught off guard. If the goal is gaining inheritance rights from an adoptive parent, understand that inheritance rights from the biological family may go the other direction. Think through both sides before filing.
Name Change and New Birth Certificate
Once the adoption is final, the adoptee can request a legal name change to the adoptive parent’s surname. The court can handle the change as part of the adoption proceeding or as a separate filing. A new birth certificate can also be issued listing the adoptive parent as the parent of record. The court forwards the paperwork to the state’s vital records office, which issues the amended certificate.
Tax Effects
Adult adoption does not create income tax consequences by itself, but it opens some gift and estate planning options. Once the legal parent-child relationship is in place, the adoptive parent can make gifts to the adopted adult under the annual gift tax exclusion — $19,000 per recipient in 2026, or $38,000 if the adoptive parent and their spouse elect gift splitting. The adoptive parent can also pay tuition or medical expenses directly on the adoptee’s behalf without those payments counting as taxable gifts.1Internal Revenue Service. Frequently Asked Questions on Gift Taxes For federal estate tax purposes, the adopted adult is treated as a legal child, which matters most in larger estates.
What Adult Adoption Will Not Do
People sometimes reach for adult adoption expecting results it cannot deliver.
Immigration
Federal immigration law defines “child” as an unmarried person under 21 who was adopted before turning 16.2Legal Information Institute. 8 USC 1101(b)(1) – Definition of Child An adoption that happens after the adoptee turns 18 does not make them a “child” for visa petitions, green card sponsorship, or citizenship. Adult adoption has no effect under federal immigration law.
Decision-Making Authority
Adopting a competent adult does not give the adoptive parent authority over the adoptee’s medical or financial decisions. A competent adult makes their own choices regardless of who their legal parents are. If the goal is decision-making authority, for example over an adult child with a disability, the adoption should be paired with a guardianship, conservatorship, or durable power of attorney depending on the situation and state law.
Health Insurance
The Affordable Care Act requires plans that offer dependent coverage to extend it until the child reaches 26. If the adoptee is under 26, the adoption may allow them to be added to the adoptive parent’s plan. If the adoptee is 26 or older, which describes most adult adoptions, the ACA dependent coverage rule does not apply.
Social Security Survivor Benefits
Social Security survivor benefits are available to certain children when a parent dies, but adult children generally qualify only if they have a disability that began before age 22.3Social Security Administration. Who Can Get Survivor Benefits A healthy adult adopted at 30 would not become eligible for survivor benefits on the adoptive parent’s record.
Adult Adoption and Trusts
Trusts are one area where adult adoption produces real legal fights. Some beneficiaries have adopted adults in an attempt to redirect trust assets: if a trust names the beneficiary’s “children” as the next recipients, adopting someone theoretically adds another child to that group. Courts have pushed back. In one case, a probate judge annulled an adoption 17 years after it happened, ruling that the family trust was intended for grandchildren in a typical parent-child relationship rather than partners adopted to reach trust funds.
Estate planners have responded by drafting trust language that excludes beneficiaries adopted after a certain age, which shuts down this use of adult adoption. If you are considering adult adoption and either party is a beneficiary of an existing trust, read the trust language carefully first. The adoption can trigger unintended consequences or draw a court challenge.
Reversing an Adult Adoption
In most states, an adult adoption can be reversed, but reversal is not automatic. The party seeking it has to file a new petition and show good cause. Courts have reversed adoptions where fraud was involved, where both parties agreed to undo the arrangement, or where the adoption was obtained through duress. The bar sits higher than for the original adoption, because courts are reluctant to unwind established legal relationships. If reversal is granted, the legal parent-child relationship dissolves and inheritance rights return to what they were before the adoption.